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19-0867; Rev 0; 9/07
KIT ATION EVALU ILABLE AVA
Standard-Definition Video Filter Amplifiers with Dual SPST Switches
General Description
The MAX9517/MAX9524 are low-power video amplifiers with integrated reconstruction filters. Specially suited for standard-definition video signals, such as composite and luma, these devices are ideal for a wide range of applications such as cell phones and security/CCTV cameras. Video signals should be DC-coupled into the MAX9517 input and AC-coupled into the MAX9524 input. The MAX9517/MAX9524 have two single-pole, singlethrow (SPST) analog switches that can be used to route stereo audio, video, or digital signals. The reconstruction filter typically has 1dB passband flatness at 9MHz and 52dB attenuation at 27MHz. The amplifiers have a gain of 2V/V, and the outputs can be DC-coupled to a load of 75, which is equivalent to two video loads. The outputs can be AC-coupled to a load of 150, which is equivalent to one video load. The MAX9517/MAX9524 operate from a 2.7V to 3.6V single supply and are specified over the -40C to +125C automotive temperature range. The MAX9517/ MAX9524 are available in a small 12-pin TQFN (3mm x 3mm) package.
Features
Integrated Reconstruction Filter for StandardDefinition Video 9MHz, 1dB Passband 52dB Attenuation at 27MHz Dual SPST Switches Fixed Gain of 2V/V DC- or AC-Coupled Output 2.7V to 3.6V Single-Supply Operation
MAX9517/MAX9524
Applications
Security/CCTV Cameras Mobile Phones/Cell Phones Digital Still Cameras (DSC) Camcorders (DVC) Portable Media Players (PMP)
Ordering Information
PART MAX9517ATC+ MAX9524ATC+ INPUT TYPE DC BIAS AC CLAMP PIN-PACKAGE 12 TQFN-EP* 12 TQFN-EP* PKG CODE T1233+4 T1233+4 TOP MARK ABF ABE
Note: All devices are specified over the -40C to +125C operating temperature range. +Denotes a lead-free package. *EP = Exposed pad. Pin Configuration appears at end of data sheet.
Functional Diagrams
300mV TO 400mV VIDOUT UNKNOWN BIAS
0 TO 50mV
SHDN BUFFER
MAX9517
SHDN
MAX9524
300mV
VIDIN
LPF IN1 NO1 IN2 NO2
AV = 2V/V
VIDIN
CLAMP
LPF
AV = 2V/V
VIDOUT
IN1 COM1 NO1 IN2 COM2 NO2 COM2 COM1
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
Standard-Definition Video Filter Amplifiers with Dual SPST Switches MAX9517/MAX9524
ABSOLUTE MAXIMUM RATINGS
VDD to GND ..............................................................-0.3V to +4V VIDIN to GND ...........................................................-0.3V to +4V COM_, NO_ to GND ...................................-0.3V to (VDD + 0.3V) SHDN, IN_ to GND ...................................................-0.3V to +4V VIDOUT Short-Circuit Duration to VDD, GND .............Continuous Continuous Input Current VIDIN, IN_, SHDN ..........................................................20mA COM_, NO_ .................................................................100mA Peak Current COM_, NO_ (pulsed at 1ms, 10% duty cycle) ............200mA Continuous Power Dissipation (TA = +70C) 12-Pin TQFN (derate 14.7mW/C above +70C) ........1177mW Operating Temperature Range .........................-40C to +125C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering 10s) ..................................+300C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VDD = SHDN = 3.3V, GND = 0V, no load, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER Supply Voltage Range Supply Current Shutdown Supply Current VIDEO DC BUFFER INPUTS (MAX9517) Input Voltage Range Input Current Input Resistance VIN IIN RIN VDD = 2.7V, 0 VIN 1.05V 1.95 1.95 200 Guaranteed by outputvoltage swing VIN = 0V VDD = 2.7V VDD = 3V 0 0 3.5 300 2.00 2.00 300 2.1 2.1 2.4 2.4 2.1 VP-P 2.04 V/V 2.04 410 mV 1.05 1.2 10 V A k SYMBOL VDD IDD ISHDN MAX9517 MAX9524 VSHDN = GND CONDITIONS Guaranteed by PSRR MIN 2.7 3.5 4.25 TYP MAX 3.6 7 8 1 UNITS V mA A
DC Voltage Gain
AV
Output Level
VDD = 3V, 0 VIN 1.2V Measured at VOUT, VIDIN = 0.1F to GND, RL = 150 to GND Measured at output, VDD = 2.7V, 0 VIN 1.05V, RL = 150 to -0.2V Measured at output, VDD = 2.7V, 0 VIN 1.05V, RL = 150 to VDD/2
RL = 150 to GND
Output-Voltage Swing
Measured at output, VDD = 3V, 0 VIN 1.2V, RL = 150 to -0.2V Measured at output, VDD = 3V, 0 VIN 1.2V, RL = 150 to VDD/2 Measured at output, VDD = 3.135V, 0 VIN 1.05V, RL = 75 to -0.2V
SYNC-TIP CLAMP INPUT (MAX9524) Sync-Tip Clamp Level Input Voltage Range VCLP Sync-tip clamp VDD = 2.7V to 3.6V VDD = 3V to 3.6V Sync-tip clamp, percentage reduction in sync pulse (0.3VP-P), guaranteed by input clamping current measurement 0.23 0.39 1.05 1.2 2 V VP-P
Sync Crush
%
2
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Standard-Definition Video Filter Amplifiers with Dual SPST Switches
ELECTRICAL CHARACTERISTICS (continued)
(VDD = SHDN = 3.3V, GND = 0V, no load, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER Input Clamping Current Maximum Input Source Resistance VDD = 2.7V, 0 VIN 1.05V VDD = 3V, 0 VIN 1.2V 1.95 1.95 0.21 SYMBOL Sync-tip clamp CONDITIONS MIN TYP 1 300 2.00 2.00 0.30 2.1 2.1 2.4 2.4 2.1 140 70 0.2 1 48 9 f = 5.5MHz VVIDOUT = 2VP-P, reference frequency is 100kHz f = 10MHz f = 27MHz Differential Gain DG 5-step modulated staircase of 129mV step size and 286mVP-P subcarrier amplitude; f = 4.43MHz 5-step modulated staircase of 129mV step size and 286mVP-P subcarrier amplitude; f = 4.43MHz Bar time is 18s, the beginning 2.5% and the ending 2.5% of the bar time are ignored, 2T = 200ns 2T = 200ns Bar time is 18s, the beginning 2.5% and the ending 2.5% of the bar time are ignored, 2T = 200ns +0.15 -3 -52 1 % dB mA A dB MHz VP-P 2.04 V/V 2.04 0.39 V MAX 2 UNITS A
MAX9517/MAX9524
DC Voltage Gain (Note 2)
AV
RL = 150 to GND
Output Level
Measured at VOUT, VIDIN = 0.1F to GND, RL = 150 to GND Measured at output, VDD = 2.7V, VIN = VCLP to (VCLP +1.05V), RL = 150 to -0.2V Measured at output, VDD = 2.7V, VIN = VCLP to (VCLP +1.05V), RL = 150 to VDD/2
Output-Voltage Swing
Measured at output, VDD = 3V, VIN = VCLP to (VCLP +1.2V), RL = 150 to -0.2V Measured at output, VDD = 3V, VIN = VCLP to (VCLP +1.2V), RL = 150 to VDD/2 Measured at output, VDD = 3.135V, VIN = VCLP to (VCLP +1.05V), RL = 75 to -0.2V
Output Short-Circuit Current Output Resistance Output Leakage Current Power-Supply Rejection Ratio Standard-Definition Reconstruction Filter ROUT
Short to GND (sourcing) Short to VCC (sinking) VOUT = 1.5V, -10mA ILOAD +10mA SHDN = GND 2.7V VDD 3.6V 1dB passband flatness
Differential Phase
DP
0.4
Degrees
2T Pulse-to-Bar K Rating 2T Pulse Response 2T Bar Response
0.6 0.2 0.2
K% K% K%
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Standard-Definition Video Filter Amplifiers with Dual SPST Switches MAX9517/MAX9524
ELECTRICAL CHARACTERISTICS (continued)
(VDD = SHDN = 3.3V, GND = 0V, no load, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER Nonlinearity Group Delay Distortion Peak Signal to RMS Noise Power-Supply Rejection Ratio Output Impedance All-Hostile Crosstalk ANALOG SWITCHES Analog Signal Range On-Resistance (Note 3) On-Resistance Match Between Channels (Notes 3, 4) On-Resistance Flatness (Note 5) NO_ Off-Leakage Current (Note 3) COM_ On-Leakage Current (Note 3) Turn-On Time Turn-Off Time Skew (Note 3) Charge Injection Off-Isolation On-Channel -3dB Bandwidth Total Harmonic Distortion NO_ Off-Capacitance Switch On-Capacitance VCOM_, VNO_ RON RON RFLAT(ON) INO_(OFF) ICOM_(ON) tON tOFF tSKEW Q VISO BW THD CNO_(OFF) C(ON) VDD = 2.7V, ICOM_ = 10mA, VNO_ = 1.5V VDD = 2.7V, ICOM_ = 10mA, VNO_ = 1.5V VDD = 2.7V, ICOM_ = 10mA, VNO_ = 1.0V, 1.5V, 2.0V VDD = 3.6V, VCOM_ = 0.3V, 3.3V; VNO_ = 3.3V, 0.3V VDD = 3.6V, VCOM_ = 0.3V, 3.3V; VNO_ = 0.3V, 3.3V, or unconnected VNO_ = 1.5V; RL = 300, CL = 35pF, VIH = 1.5V, VIL = 0V VNO_ = 1.5V; RL = 300, CL = 35pF, VIH = 1.5V, VIL = 0V RS = 39, CL = 50pF VGEN = 1.5V, RGEN = 0, CL = 1nF f = 10MHz; VNO_ = 1VP-P; RL = 50, CL = 5pF f = 1MHz; VNO_ = 1VP-P; RL = 50, CL = 5pF Signal = 0dBm, RL = 50, CL = 5pF VCOM_ = 2VP-P, RL = 600 f = 1MHz f = 1MHz f = 10MHz; VNO_ = 1VP-P, RL = 50, CL = 5pF f = 1MHz; VNO_ = 1VP-P, RL = 50, CL = 5pF Video circuit is on, switches are open f = 10MHz; VNO_ = 1VP-P f = 1MHz; VNO_ = 1VP-P 10 -55 -80 300 0.03 20 50 -80 dB -110 -55 dB -80 MHz % pF pF -2 -2.5 0.5 0 1.7 VDD 5.0 0.4 1.5 +2 +2.5 100 100 2 V nA nA ns ns ns pC dB SYMBOL CONDITIONS 5-step staircase, f = 4.43MHz 100kHz f 5.5MHz, outputs are 2VP-P 100kHz f 5.5MHz f = 1MHz, 100mVP-P f = 5.5MHz f = 4.43MHz MIN TYP 0.5 12 71 29 4.8 -64 MAX UNITS % ns dB dB dB
Switch-to-Switch
VCT
NO_-to-VIDOUT
4
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Standard-Definition Video Filter Amplifiers with Dual SPST Switches
ELECTRICAL CHARACTERISTICS (continued)
(VDD = SHDN = 3.3V, GND = 0V, no load, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER CROSSTALK VIDOUT-to-NO_ VIDIN-to-COM VIDOUT-to-COM LOGIC SIGNAL (IN1 AND IN2) Logic-Low Threshold Logic-High Threshold Logic-Input Current LOGIC SIGNAL (SHDN) Logic-Low Threshold Logic-High Threshold Logic-Input Current VIL VIH IIN 0.7 x VDD 10 0.3 x VDD V V A VIL VIH IIN 1.4 10 0.5 V V A Video circuit is on, f = 20kHz, VIDOUT = 2VP-P, RL = 50, CL = 5pF Video circuit is shutdown, f = 20kHz, 0.25VP-P at VIDIN, RL = 600 Video circuit is on, f = 20kHz, VIDOUT = 2VP-P, RL = 50, CL = 5pF 90 100 90 dB dB dB SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX9517/MAX9524
Note 1: Note 2: Note 3: Note 4: Note 5:
All devices are 100% production tested at TA = +25C. Specifications over temperature limits are guaranteed by design. Voltage gain (AV) is a two-point measurement in which the output-voltage swing is divided by the input-voltage swing. Guaranteed by design. RON = RON(MAX) - RON(MIN). Flatness is defined as the difference between the maximum and minimum value of on-resistance as measured over the specified analog signal ranges.
Typical Operating Characteristics
(VDD = SHDN = 3.3V. Video outputs have RL = 150 connected to GND. TA = +25C, unless otherwise noted.)
SMALL-SIGNAL GAIN vs. FREQUENCY
MAX9517/24 toc01
SMALL-SIGNAL GAIN FLATNESS vs. FREQUENCY
0.5 0 -0.5 GAIN (dB) GAIN (dB) -1.0 -1.5 -2.0 -2.5 -3.0 -20 -30 -40 -50 -60 VOUT = 100mVP-P
MAX9517/24 toc02
LARGE-SIGNAL GAIN vs. FREQUENCY
0 -10
MAX9517/24 toc03
10 0 -10 -20 GAIN (dB) -30 -40 -50 -60 -70 -80 100k 1M 10M VOUT = 100mVP-P
1.0
10
-3.5 -4.0 100M 1M 10M FREQUENCY (Hz) 100M
VOUT = 2VP-P -70 100k 1M 10M 100M FREQUENCY (Hz)
FREQUENCY (Hz)
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Standard-Definition Video Filter Amplifiers with Dual SPST Switches MAX9517/MAX9524
Typical Operating Characteristics (continued)
(VDD = SHDN = 3.3V. Video outputs have RL = 150 connected to GND. TA = +25C, unless otherwise noted.)
LARGE-SIGNAL GAIN FLATNESS vs. FREQUENCY
MAX9517/24 toc04
GROUP DELAY vs. FREQUENCY
VOUT = 2VP-P 100 GROUP DELAY (ns) 80 60 40 20 -70 0 -80 100k 1M 10M 100M 10k PSRR (dB) -30 -40 -50 -60
MAX9517/24 toc05
POWER-SUPPLY REJECTION RATIO vs. FREQUENCY
-10 -20
MAX9517/24 toc06
1.0 0.5 0 GAIN FLATNESS (dB) -0.5 -1.0 -1.5 -2.0 -2.5 -3.0 -3.5 -4.0 1M 10M FREQUENCY (Hz) VOUT = 2VP-P
120
0
100M
100k
1M FREQUENCY (Hz)
10M
100M
FREQUENCY (Hz)
QUIESCENT SUPPLY CURRENT vs. TEMPERATURE
MAX9517/24 toc07
VOLTAGE GAIN vs. TEMPERATURE
2.03 2.02 VOLTAGE GAIN (V/V) 2.01 2.00 1.99 1.98 1.97 1.96 1.95
MAX9517/24 toc08
OUTPUT VOLTAGE vs. INPUT VOLTAGE (MAX9517)
3.0 OUTPUT VOLTAGE (V) 2.5 2.0 1.5 1.0 0.5 0 -0.5
MAX9517/24 toc09
7.0 QUIESCENT SUPPLY CURRENT (mA) 6.5 6.0 5.5 5.0 4.5 4.0 3.5 3.0 2.5 2.0 -50 -25 0 25 50 75 100
2.04
3.5
125
-50
-25
0
25
50
75
100
125
-0.3
0
0.3
0.6
0.9
1.2
1.5
1.8
TEMPERATURE (C)
TEMPERATURE (C)
INPUT VOLTAGE (V)
DIFFERENTIAL GAIN AND PHASE
DIFFERENTIAL GAIN (%) 0.1 0 -0.1 -0.2 -0.3 -0.4 1 0.8 0.6 0.4 0.2 0 -0.2 -0.4 1 2 3 4 5 2 3 4 5
MAX9517/24 toc10
2T RESPONSE
MAX9517/24 toc11
f = 4.43MHz 6 7
VIDIN 200mV/div
DIFFERENTIAL PHASE (deg)
VIDOUT 400mV/div
f = 4.43MHz 6 7 100ns/div
6
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Standard-Definition Video Filter Amplifiers with Dual SPST Switches
Typical Operating Characteristics (continued)
(VDD = SHDN = 3.3V. Video outputs have RL = 150 connected to GND. TA = +25C, unless otherwise noted.)
MAX9517/MAX9524
12.5T RESPONSE
MAX9517/24 toc12
NTC-7 VIDEO TEST SIGNAL
MAX9517/24 toc13
PAL MULTIBURST RESPONSE
MAX9517/24 toc14
VIDIN 200mV/div
VIDIN 500mV/div
VIDIN 500mV/div
VIDOUT 400mV/div
VIDOUT 1V/div
VIDOUT 1V/div
400ns/div
10s/div
10s/div
PAL COLOR BARS
MAX9517/24 toc15
FIELD SQUARE-WAVE RESPONSE
MAX9517/24 toc16
SWITCH INPUT-TO-INPUT CROSSTALK vs. FREQUENCY
MAX9517/24 toc17
0 -20
GAIN (dB)
VIDIN 500mV/div
VIDIN 500mV/div
-40 -60 -80 -100 -120
VIDOUT 1V/div
VIDOUT 1V/div
10s/div
2ms/div
100k
1M
10M
100M
FREQUENCY (Hz)
SWITCH OUTPUT-TO-OUTPUT CROSSTALK vs. FREQUENCY
MAX9517/24 toc18
OUTPUT IMPEDANCE vs. FREQUENCY
MAX9517/24 toc19
0 -20 -40 GAIN (dB) -60 -80 -100 -120 100k 1M 10M
100
OUTPUT IMPEDANCE ()
10
1
0.1
0.01 100M 100k 1M FREQUENCY (Hz) 10M FREQUENCY (Hz)
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Standard-Definition Video Filter Amplifiers with Dual SPST Switches MAX9517/MAX9524
Typical Operating Characteristics (continued)
(VDD = SHDN = 3.3V. Video outputs have RL = 150 connected to GND. TA = +25C, unless otherwise noted.)
MAX9517 ENABLE RESPONSE
MAX9517/24 toc20
MAX9524 ENABLE RESPONSE
MAX9517/24 toc21
VIN = 0.1F TO GND SHDN 1V/div SHDN 1V/div
VIN = 1V
OUTPUT 1V/div
OUTPUT 250mV/div
4ms/div
4ms/div
MAX9517 DISABLE RESPONSE
MAX9517/24 toc22
MAX9524 DISABLE RESPONSE
MAX9517/24 toc23
VIN = 1V SHDN 1V/div
VIN = 0.1F TO GND SHDN 1V/div
OUTPUT 1V/div
OUTPUT 250mV/div
10ns/div
10ns/div
Pin Description
PIN 1 2 3 4 5 6 7 8 9 10 11 12 -- NAME N.C. COM1 COM2 VIDOUT GND VIDIN NO2 NO1 SHDN IN1 IN2 VDD EP No Connection. Not internally connected. Analog Switch 1 Common Terminal Analog Switch 2 Common Terminal Video Output Ground Video Input Analog Switch 2 Normally Open Terminal Analog Switch 1 Normally Open Terminal Active-Low Shutdown Input. Connect to GND to place device in shutdown. Analog Switch 1 Digital Control Input Analog Switch 2 Digital Control Input Positive Power Supply. Bypass to GND with a 0.1F capacitor. Exposed Paddle. Connect EP to GND. EP is also internally connected to GND. FUNCTION
8
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Standard-Definition Video Filter Amplifiers with Dual SPST Switches
Detailed Description
The MAX9517/MAX9524 consist of a lowpass filter and an output amplifier capable of driving a standard 150 video load to ground. The MAX9517 has an input buffer and the MAX9524 has an input sync-tip clamp. The MAX9517/MAX9524 both have two SPST analog switches that can be used to route audio, video, or digital signals. The output amplifiers provide a fixed gain of 2V/V. The MAX9517/MAX9524 filter and amplify the video DAC output. External video signals, in which the DC bias is usually not known, can be AC-coupled to the MAX9524.
Outputs
The video output amplifiers can both source and sink load current, allowing output loads to be DC- or ACcoupled. The amplifier output stage needs around 300mV of headroom from either supply rail. The parts have an internal level shift circuit that positions the sync tip at approximately 300mV at the output. If the supply voltage is greater than 3.135V (5% below a 3.3V supply), each amplifier can drive two DC-coupled video loads to ground. If the supply is less than 3.135V, each amplifier can drive only one DC-coupled or AC-coupled video load.
MAX9517/MAX9524
Shutdown
The MAX9517/MAX9524 draw less than 1A supply current when SHDN is low. In shutdown, the amplifier output becomes high impedance.
Input with DC Buffer (MAX9517)
The input of the MAX9517 can be directly connected to the video source if the signal is approximately between ground and 1V. This specification is commonly found at the output of most video DACs. DC-coupling requires that the input signals are ground referenced so that the sync tip of composite or luma signals is within 50mV of ground.
SPST Analog Switches
Table 1. Logic for Analog Switches
IN_ 0 1 SWITCH STATE OFF ON
Input with Sync-Tip Clamp (MAX9524)
When the bias of the incoming video signal is either unknown or not between ground and 1V (such as an external video source), use the MAX9524 to connect the video source through a 0.1F capacitor. The VIDIN input of the MAX9524 can only handle signals with a sync pulse, such as composite video and luma. An internal sync-tip clamp sets the internal DC level of the video signal.
Applications Information
Reducing Power Consumption in the Video DACs
The MAX9517/MAX9524 have high-impedance input buffers that can work with source resistances as high as 300. To reduce power dissipation in the video DACs, the DAC output resistor can be scaled up in value. The reference resistor that sets the reference current inside the video DACs must also be similarly scaled up. For instance, if the output resistor is 37.5, the DAC must source 26.7mA when the output is 1V. If the output resistor is increased to 300, the DAC only needs to source 3.33mA when the output is 1V. There is parasitic capacitance from the DAC output to ground. That capacitance in parallel with the DAC output resistor forms a pole that can potentially roll off the frequency response of the video signal. For example, 300 in parallel with 50pF creates a pole at 10.6MHz. To minimize this capacitance, reduce the area of the signal trace attached to the DAC output as much as possible, and place the MAX9517/MAX9524 as close as possible to the video DAC outputs.
Video Filter
The filter passband (1dB) is typically 9MHz to make the device suitable for standard-definition video signals from all sources (including broadcast video and DVD). Broadcast video signals are channel limited: NTSC signals have 4.2MHz bandwidth, and PAL signals have 5MHz bandwidth. Video signals from a DVD player, however, are not channel limited; therefore, the bandwidth of DVD video signals can approach the Nyquist limit of 6.75MHz (recommendation ITU-R BT.601-5 specifies 13.5MHz as the sampling rate for standarddefinition video). Therefore, the maximum bandwidth of the signal is 6.75MHz. To ease the filtering requirements, most modern video systems oversample by two times, clocking the video current DAC at 27MHz.
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Standard-Definition Video Filter Amplifiers with Dual SPST Switches MAX9517/MAX9524
AC-Coupling the Outputs
The outputs can be AC-coupled because the output stage can source and sink current as shown in Figure 1. Coupling capacitors should be 220F or greater to keep the highpass filter formed by the 150 equivalent resistance of the video transmission line to a corner frequency of 4.8Hz or below. The frame rate of PAL systems is 25Hz, and the frame rate of NTSC systems is 30Hz. The corner frequency should be well below the frame rate. in which the MAX9517 chooses between two internal video sources. The two analog switches can be used as a 2:1 multiplexer to select which video DAC output is actually filtered, amplified, and then driven out to the connector. Close switch 1 to select the video from the application processor. Close switch 2 to select the video from the mobile graphics processor. Figure 8 shows the application in which the MAX9524 chooses between two external video sources with unknown DC bias.
Changing Between Video Output and Microphone Input on a Single Connector
A single pole on a mobile phone jack can be used for transmitting a video signal to a television or receiving the signal from the microphone of a headset. Figure 2 shows how the MAX9517 can transmit a video signal. Figure 3 shows how the MAX9517 can receive and pass on the signal from a microphone.
Y/C Mixer with Chroma Mute
If the video application processor has two current output digital-to-analog converters (DACs) for luma (Y) and chroma (C), respectively, then the signals can be mixed together to create a composite video signal by summing the currents into a single resistor, as shown in Figure 9. The composite video signal should be ACcoupled into the MAX9524 because the composite video signal has a positive DC level shift. The sync-tip clamp of the MAX9524 will re-establish the DC bias level of the signal inside the chip. The chroma current is connected to essentially a single-pole, double-throw (SPDT) switch. In one position, the switch routes the chroma current into the resistor. In the other position, the switch routes the chroma current into ground. For the Y/C mixer to work properly, the chroma current must be routed through analog switch 1 into the resistor. If the chroma signal needs to be muted, then the chroma current is shunted to ground through analog switch 2. Analog switch 1 stays open. See Figure 10.
Switching Between Video and Digital Signals
The dual SPST analog switches and the high-impedance output of the video amplifier enable video transmission, digital transmission, and digital reception all on a single pole of a connector. Figures 4, 5, and 6 show the different configurations of the MAX9517.
Selecting Between Two Video Sources
The analog switches can multiplex between two video sources. For example, a mobile phone might have an application processor with an integrated video encoder and a mobile graphics processor with an integrated video encoder, each creating a composite video signal that is between 0 and 1V. Figure 7 shows this application
VDD APPLICATION PROCESSOR SHDN +3.3V BUFFER DAC CVBS VIDIN LPF AV = 2V/V VIDOUT
+3.3V 0.1F
MAX9517
GND
75
220F CVBS
IN1 NO1 MICROCONTROLLER IN2 NO2 COM2 COM1
Figure 1. AC-Coupled Outputs
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Standard-Definition Video Filter Amplifiers with Dual SPST Switches MAX9517/MAX9524
VDD APPLICATION PROCESSOR +3.3V BUFFER DAC CVBS VIDIN LPF AV = 2V/V VIDOUT 75 TO JACK SHDN +3.3V 0.1F
MAX9517
GND
VCC VCC BASEBAND IC MIC BIAS OFF MIC AMP OFF IN1 NO1 IN2 NO2 COM2 COM1
Figure 2. Video Output Configuration
VDD APPLICATION PROCESSOR OFF DAC CVBS VIDIN LPF OFF OFF SHDN BUFFER AV = 2V/V OFF VIDOUT
+3.3V 0.1F
MAX9517
GND
75 TO JACK
VCC VCC BASEBAND IC MIC BIAS IN1 NO1 IN2 MIC AMP NO2
COM1
COM2
Figure 3. Microphone Input Configuration
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11
Standard-Definition Video Filter Amplifiers with Dual SPST Switches MAX9517/MAX9524
VDD APPLICATION PROCESSOR +3.3V BUFFER DAC CVBS VIDIN LPF AV = 2V/V VIDOUT 75 TO JACK SHDN +3.3V 0.1F
MAX9517
GND
VCC VCC BASEBAND IC OFF IN1 NO1 IN2 NO2 OFF COM2 COM1
Figure 4. Video Output Configuration
VDD APPLICATION PROCESSOR OFF DAC CVBS VIDIN LPF OFF OFF SHDN BUFFER AV = 2V/V OFF VIDOUT
+3.3V 0.1F
MAX9517
GND
75 TO JACK
VCC VCC BASEBAND IC OFF IN1 NO1 IN2 NO2
COM1
COM2
Figure 5. Digital Output Configuration
12
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Standard-Definition Video Filter Amplifiers with Dual SPST Switches MAX9517/MAX9524
VDD APPLICATION PROCESSOR OFF DAC CVBS VIDIN LPF OFF OFF SHDN BUFFER AV = 2V/V OFF VIDOUT 75 TO JACK +3.3V 0.1F
MAX9517
GND
VCC VCC BASEBAND IC IN1 NO1 IN2 NO2 OFF
COM1
COM2
Figure 6. Digital Input Configuration
VDD SHDN BUFFER VIDIN LPF AV = 2V/V VIDOUT 75
+3.3V 0.1F
MAX9517
GND
APPLICATION PROCESSOR
DAC SW1
IN1 NO1 COM1
SW2
IN2 NO2 COM2 MOBILE GPU DAC
Figure 7. Selecting Between Two Internal Video Sources
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13
Standard-Definition Video Filter Amplifiers with Dual SPST Switches MAX9517/MAX9524
VDD SHDN VIDIN CLAMP IN1 LPF MAX9524 GND VIDOUT
+3.3V 0.1F
75 CVBS_OUT
SW_CONTROL
6dB
0.1F CVBS_IN1
NO1 IN2 0.1F NO2
COM1
CVBS_IN2 75 75
COM2
Figure 8. Selecting Between Two External Video Sources
VDD SHDN 0.1F APPLICATION PROCESSOR VIDIN CLAMP IN1 LPF MAX9524 GND VIDOUT
+3.3V 0.1F
GPIO 1
75 CVBS
6dB
GPIO 2
NO1 C IN2 NO2 y
COM1
DAC
COM2
DAC
Figure 9. Luma and Chroma Mixer Circuit (Chroma Current Routed into Resistor)
14 ______________________________________________________________________________________
Standard-Definition Video Filter Amplifiers with Dual SPST Switches MAX9517/MAX9524
VDD SHDN 0.1F APPLICATION PROCESSOR VIDIN CLAMP IN1 LPF MAX9524 GND VIDOUT
+3.3V 0.1F
GPIO 1
75 LUMA
6dB
GPIO 2
NO1 C IN2 NO2
COM1
DAC
COM2
DAC
y
Figure 10. Luma and Chroma Mixer Circuit with Chroma Muted. Chroma Current is Shunted into Ground Through Analog Switch 2.
______________________________________________________________________________________
15
Standard-Definition Video Filter Amplifiers with Dual SPST Switches MAX9517/MAX9524
Anti-Alias Filter
The MAX9524 can also provide anti-alias filtering with buffer before an analog-to-digital converter (ADC), which would be present in an NTSC/PAL video decoder, for example. Figure 11 shows an example application circuit for MAX9524. An external composite video signal is applied to IN, which is terminated with 75 to ground. The signal is AC-coupled to VIDIN because the DC level of an external video signal is usually not well specified.
Power-Supply Bypassing and Ground
The MAX9517/MAX9524 operate from a single-supply voltage down to 2.7V, allowing for low-power operation. Bypass VDD to GND with a 0.1F capacitor. Place all external components as close as possible to the device.
VDD SHDN SHUTDOWN CIRCUIT
MAX9524
IN 0.1F 75
VIDIN
CLAMP
LPF
AV = 2V/V
VIDOUT 75 75
VIDEO DECODER
Figure 11. MAX9524 is Used as an Anti-Alias Filter with Buffer (Switches Can Route Other Signals)
Switch Test Circuits/Timing Diagrams
MAX9517 MAX9524
VNO
VDD V DD COM RL IN_ CL VOUT SWITCH OUTPUT 0V 0.9 x V0UT LOGIC INPUT VOUT t OFF VIH VIL 50%
t r < 5ns t f < 5ns
LOGIC INPUT
GND
0.9 x VOUT
t ON
VOUT = VN_
CL INCLUDES FIXTURE AND STRAY CAPACITANCE. RL RL + RON
(
)
Figure 12. Switching Time
16 ______________________________________________________________________________________
Standard-Definition Video Filter Amplifiers with Dual SPST Switches
Switch Test Circuits/Timing Diagrams (continued)
MAX9517/MAX9524
RS
IN+
MAX9517 MAX9524
NO1 COM1 CL OUT+
RS
IN-
NO2
COM2 CL
OUT-
LOGIC INPUT
0V TO VDD
tINFALL VDD VIN+ 0V VDD VIN0V tOUTFALL VDD VOUT+ 0V VDD VOUT0V 50% 50% 10% 50% VDD 50% 10% 90%
tINRISE 90%
10%
tOUTRISE 90%
90%
10%
tSKEW
Figure 13. Output Signal Skew
______________________________________________________________________________________
17
Standard-Definition Video Filter Amplifiers with Dual SPST Switches MAX9517/MAX9524
Switch Test Circuits/Timing Diagrams (continued)
MAX9517 MAX9524
RGEN + V GEN GND IN_ ON 0V TO VDD IN OFF Q = (V OUT )(C L ) OFF NO V DD VOUT VDD COM_ CL VOUT
VOUT
Figure 14. Charge Injection
VDD 10nF NETWORK ANALYZER VIN 0V OR VDD IN_ VDD COM_ 50 50 OFF-ISOLATION = 20log(VOUT/VIN) ON-LOSS = 20log(VOUT/VIN) CROSSTALK = 20log(VOUT/VIN)
MAX9517 MAX9524 NO_ GND
VOUT
MEAS
REF
50
50
MEASUREMENTS ARE STANDARDIZED AGAINST SHORTS AT IC TERMINALS. OFF-ISOLATION IS MEASURED BETWEEN COM_ AND OFF NO_ TERMINAL ON EACH SWITCH. ON-LOSS IS MEASURED BETWEEN COM_ AND ON NO_ TERMINAL ON EACH SWITCH. SIGNAL DIRECTION THROUGH SWITCH IS REVERSED; WORST VALUES ARE RECORDED.
Figure 15. On-Loss, Off-Isolation, and Crosstalk
VDD
10nF
VDD COM_ CAPACITANCE ANALYZER f = 1MHz NO_ GND MAX9517 MAX9524 IN
0V OR VDD
Figure 16. Channel Off-/On-Capacitance
18 ______________________________________________________________________________________
Standard-Definition Video Filter Amplifiers with Dual SPST Switches
Typical Operating Circuits
MAX9517/MAX9524
VDD APPLICATION PROCESSOR SHDN BUFFER DAC CVBS VIDIN LPF 75 AV = 2V/V
+3.3V 0.1F
MAX9517
GND
CVBS
IN1 NO1 MICROCONTROLLER IN2 NO2 COM2 COM1
VDD APPLICATION PROCESSOR VDD SHDN
+3.3V 0.1F
MAX9524
GND
DAC
CVBS
0.1F
VIDIN
CLAMP
LPF
AV = 2V/V
VIDOUT
75 CVBS
IN1 NO1 MICROCONTROLLER IN2 NO2 COM2 COM1
______________________________________________________________________________________
19
Standard-Definition Video Filter Amplifiers with Dual SPST Switches MAX9517/MAX9524
Pin Configuration
PROCESS: BiCMOS
SHDN NO1 NO2
Chip Information
TOP VIEW
9 IN1 10
8
7 6 VIDIN
IN2 11
MAX9517 MAX9524
EP*
+
5
GND
VDD 12 1 N.C. 2 COM1
4
VIDOUT
3 COM2
THIN QFN (3mm x 3mm)
*EP = EXPOSED PADDLE
20
______________________________________________________________________________________
Standard-Definition Video Filter Amplifiers with Dual SPST Switches
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.)
12x16L QFN THIN.EPS
MAX9517/MAX9524
MARKING
E E/2
(ND - 1) X e
(NE - 1) X e
D2/2
D/2 D
AAAA
C L
e D2
k
b E2/2
0.10 M C A B
C L
L
E2
0.10 C
0.08 C A A2 A1 L
C L
C L
L
e
e
PACKAGE OUTLINE 8, 12, 16L THIN QFN, 3x3x0.8mm
21-0136
I
1 2
______________________________________________________________________________________
21
Standard-Definition Video Filter Amplifiers with Dual SPST Switches MAX9517/MAX9524
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.)
PKG REF. A b D E e L N ND NE A1 A2 k 0.25 0 0.35
8L 3x3 MIN. NOM. MAX. 0.70 0.25 2.90 2.90 0.75 0.30 3.00 3.00 0.55 8 2 2 0.02 0.20 REF 0.25 0.05 0 0.80 0.35 3.10 3.10 0.75
12L 3x3 MIN. NOM. MAX. 0.70 0.20 2.90 2.90 0.45 0.75 0.25 3.00 3.00 0.55 12 3 3 0.02 0.20 REF 0.25 0.05 0 0.80 0.30 3.10 3.10 0.65
16L 3x3 MIN. NOM. MAX. 0.70 0.20 2.90 2.90 0.30 0.75 0.25 3.00 3.00 0.40 16 4 4 0.02 0.20 REF 0.05 0.80 0.30 3.10 3.10 0.50 PKG. CODES TQ833-1 T1233-1 T1233-3 T1233-4 T1633-2 T1633F-3 T1633FH-3 T1633-4 T1633-5
EXPOSED PAD VARIATIONS
D2 MIN. 0.25 0.95 0.95 0.95 0.95 0.65 0.65 0.95 0.95 NOM. 0.70 1.10 1.10 1.10 1.10 0.80 0.80 1.10 1.10 MAX. 1.25 1.25 1.25 1.25 1.25 0.95 0.95 1.25 1.25 MIN. 0.25 0.95 0.95 0.95 0.95 0.65 0.65 0.95 0.95 E2 NOM. 0.70 1.10 1.10 1.10 1.10 0.80 0.80 1.10 1.10 MAX. 1.25 1.25 1.25 1.25 1.25 0.95 0.95 1.25 1.25 PIN ID 0.35 x 45 0.35 x 45 0.35 x 45 0.35 x 45 0.35 x 45 0.225 x 45 0.225 x 45 0.35 x 45 0.35 x 45 JEDEC WEEC WEED-1 WEED-1 WEED-1 WEED-2 WEED-2 WEED-2 WEED-2 WEED-2
0.65 BSC.
0.50 BSC.
0.50 BSC.
NOTES: 1. 2. 3. 4. DIMENSIONING & TOLERANCING CONFORM TO ASME Y14.5M-1994. ALL DIMENSIONS ARE IN MILLIMETERS. ANGLES ARE IN DEGREES. N IS THE TOTAL NUMBER OF TERMINALS. THE TERMINAL #1 IDENTIFIER AND TERMINAL NUMBERING CONVENTION SHALL CONFORM TO JESD 95-1 SPP-012. DETAILS OF TERMINAL #1 IDENTIFIER ARE OPTIONAL, BUT MUST BE LOCATED WITHIN THE ZONE INDICATED. THE TERMINAL #1 IDENTIFIER MAY BE EITHER A MOLD OR MARKED FEATURE. DIMENSION b APPLIES TO METALLIZED TERMINAL AND IS MEASURED BETWEEN 0.20 mm AND 0.25 mm FROM TERMINAL TIP. ND AND NE REFER TO THE NUMBER OF TERMINALS ON EACH D AND E SIDE RESPECTIVELY. DEPOPULATION IS POSSIBLE IN A SYMMETRICAL FASHION. COPLANARITY APPLIES TO THE EXPOSED HEAT SINK SLUG AS WELL AS THE TERMINALS. DRAWING CONFORMS TO JEDEC MO220 REVISION C. MARKING IS FOR PACKAGE ORIENTATION REFERENCE ONLY. NUMBER OF LEADS SHOWN ARE FOR REFERENCE ONLY. WARPAGE NOT TO EXCEED 0.10mm.
5. 6. 7. 8. 9. 10. 11. 12.
PACKAGE OUTLINE 8, 12, 16L THIN QFN, 3x3x0.8mm
21-0136
I
2 2
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
22 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2007 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.

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