View MAX4141_91841.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

19-0400; Rev 0; 5/95
K ATION EVALU BLE AVAILA
IT
330MHz, 4x1 Precision Video Multiplexer
_______________General Description
The MAX4141 is a wideband 330MHz, 700V/s 4x1 multiplexer optimized for high-definition, broadcastquality, composite (HDTV, NTSC, PAL, SECAM) video switching arrays. The device includes four open-loop buffer amplifiers with a 0.1dB gain flatness of 150MHz, and enable and switch-control logic. The MAX4141 operates from 5V supplies and features differential phase and gain error of only 0.01/0.01%. The ultra-low switching glitch (less than 13mV) is positive to avoid confusion with any sync pulses. Ideal as a building block for large switch arrays, the MAX4141 features a constant, high input impedance and a disable function that puts the output into a highimpedance state and reduces the operating current to only 250A. The open-loop architecture allows the output to drive capacitive loads without oscillation. Other key features include -66dB crosstalk (30MHz), -74dB isolation (30MHz), less than 10mV offset voltage, and a 110MHz full-power bandwidth (1.4Vp-p). The MAX4141 is available in a 14-pin narrow SO package.
____________________________Features
o 330MHz -3dB Bandwidth o 0.1dB Gain Flatness of 150MHz o 700V/s Slew Rate o 0.01/0.01% Differential Phase/Gain o -66dB Crosstalk and -74dB Isolation at 30MHz o High-Z Outputs when Disabled o 3pF Input Capacitance o Low Switching Glitch o On-Board Control Logic
MAX4141
______________Ordering Information
PART MAX4141CSD TEMP. RANGE 0C to +70C PIN-PACKAGE 14 SO
________________________Applications
Broadcast/HDTV-Quality Color Signal Multiplexing Video Routers and Crosspoint Arrays RF and IF Routing Graphics Color Signal Routing Telecom Routing Data Acquisition
IN1 IN0 AV = +1
________________Functional Diagram
__________________Pin Configuration
IN2
AV = +1 OUT AV = +1
TOP VIEW
IN0 1 GND 2 IN1 3 GND 4 IN2 5 GND 6 IN3 7 14 A0 13 A1 12 VCC IN3
AV = +1
MAX4141
11 OUT 10 VEE 9 8 EN N.C. EN A0 A1 CONTROL LOGIC
SO
________________________________________________________________ Maxim Integrated Products 1
Call toll free 1-800-998-8800 for free samples or literature.
330MHz, 4x1 Precision Video Multiplexer MAX4141
ABSOLUTE MAXIMUM RATINGS
VCC ...........................................................................................6V VEE ..........................................................................................-6V VCC-VEE..................................................................................12V Analog Input Voltage .......................(VEE - 0.3V) to (VCC + 0.3V) Digital Input Voltage ...................................-0.3V to (VCC + 0.3V) Duration of Short Circuit to Ground..............Continuous (Note 1) Note 1: If maximum power-dissipation rating is met.
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.
Continuous Power Dissipation (TA = +70C) SO (derate 8.00mW/C above +70C) ........................640mW Operating Temperature Range...............................0C to +70C Storage Temperature Range .............................-65C to +160C Junction Temperature ......................................................+150C Lead Temperature (soldering, 10sec) .............................+300C
ELECTRICAL CHARACTERISTICS
(VS = 5V, -2.5V VIN +2.5V, RL = 5k, CL = 5pF, TA = 0C to +70C, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER DC PARAMETERS Operating Supply Voltage Operating Supply Current Disabled Supply Current Input Voltage Range Input Bias Current Input Resistance Input Capacitance Output Offset Voltage Power-Supply Rejection Ratio Voltage Gain Output Resistance Disabled Output Current Disabled Output Resistance Disabled Output Capacitance Logic Input High Voltage Logic Input Low Voltage Logic Input High Current Logic Input Low Current VS IS(ON) IS(OFF) VIN IB RIN CIN VOS PSRR AV ROUT IOUT(OFF) ROUT COUT VINH VINL IINH IINL VS = 4.5V to 5.5V VS = 4.5V to 5.5V VS = 4.5V to 5.5V VS = 4.5V to 5.5V 2.0 0.8 10 10 VOUT = 0V VIN = 0V Channel selected Channel disabled VIN = 0V, channel enabled or disabled TA = +25C TA = TMIN to TMAX VS = 4.5V to 5.5V VIN = 2.5V TA = +25C TA = TMIN to TMAX 50 0.98 0.97 20 10 30 5 1.0 1.0 Channel selected Channel disabled 2.5 2.5 0.2 0.4 100 3 3 10 15 4.0 Enabled TA = +25C TA = TMIN to TMAX 250 4.5 5.0 5.0 5.5 5.5 6.5 350 V mA A V A M pF mV dB V/V nA M pF V V A A SYMBOL CONDITIONS MIN TYP MAX UNITS
2
_______________________________________________________________________________________
330MHz, 4x1 Precision Video Multiplexer
ELECTRICAL CHARACTERISTICS (continued)
(VS = 5V, -2.5V VIN +2.5V, RL = 5k, CL = 5pF, TA = 0C to +70C, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER AC PARAMETERS Slew Rate Full-Power Bandwidth (Note 2) -3dB Bandwidth Gain Flatness Gain Peaking Small-Signal Rise Time Differential Gain (Note 3) Differential Phase (Note 3) All-Hostile Crosstalk Off Isolation Channel Switching Off Time Channel Switching On Time Switching Transient Group Delay Input-Output Delay Matching Second Harmonic Distortion Third Harmonic Distortion Note 2: Note 3: f = 3.58MHz Chip-to-chip, f = 3.58MHz f = 30MHz, VIN = 1.4Vp-p, RL = 2k f = 30MHz, VIN = 1.4Vp-p, RL = 2k tOFF tON tR DG DP VIN = 0.2Vp-p, 10% to 90% f = 3.58MHz f = 3.58MHz VIN = 1Vp-p, f = 30MHz, RIN = 50 VIN = 1Vp-p, f = 30MHz SR fPBW f3dB VIN = 5Vp-p VIN = 1.4Vp-p VIN = 1.4Vp-p VIN = 5Vp-p VIN = 0.1Vp-p DC to 30MHz DC to 150MHz 700 500 110 45 330 0.02 0.1 0.08 950 0.01 0.01 66 74 1.0 500 13 860 0.2 -65 -70 V/s MHz MHz dB dB ps % degrees dB dB s ns mVp-p ps degrees dBc dBc SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX4141
Full-Power Bandwidth is inferred from Slew Rate (SR) testing by the equation SR = EP, where EP is the peak output voltage and = 2f. Differential Gain and Phase are tested using a modulated ramp, 100IRE (0.714V).
MAX4141
MAX4141
HIGH-IMPEDANCE PROBE
NETWORK ANALYZER
HIGH-IMPEDANCE PROBE 20*
NETWORK ANALYZER
ALL-HOSTILE CROSSTALK TEST CIRCUIT VIN (1Vp-p)
VIN (1Vp-p)
* 20 RESISTOR USED TO SIMULATE OUTPUT RESISTOR OF AN "ON" MAX4141. IN THIS WAY, OPERATION IN AN ARRAY IS SIMULATED. OFF-ISOLATION TEST CIRCUIT
_______________________________________________________________________________________
3
330MHz, 4x1 Precision Video Multiplexer MAX4141
__________________________________________Typical Operating Characteristics
(VS = 5V, RL = 5k, CL = 1pF, TA = +25C, unless otherwise noted.)
GAIN vs. FREQUENCY
MAX4141 TOC-01
GAIN FLATNESS
MAX4141 TOC-02
OUTPUT RESISTANCE vs. FREQUENCY
MAX4141 TOC-03
2 0 -2 -4 GAIN (dB) -6 -8 -10 -12 -14 -16 -18 1 10 100
0.3 0.2 0.1 0 GAIN (dB) -0.1 -0.2 -0.3 -0.4 -0.5 -0.6 -0.7
40
OUTPUT RESISTANCE ()
30
20
10
0 1 10 100 1000 0.1 1 10 FREQUENCY (MHz) 100 500 FREQUENCY (MHz)
1000
FREQUENCY (MHz)
POWER-SUPPLY REJECTION RATIO vs. FREQUENCY
MAX4141 TOC-04
ALL-HOSTILE CROSSTALK vs. FREQUENCY
MAX4141 TOC-05
OFF ISOLATION vs. FREQUENCY
40 20 AMPLITUDE (dB) 0 -20 -40 -60 -80 -100 -120 -140
MAX4141 TOC-06
10 0 -10 AMPLITUDE (dB) -20 -30 -40 -50 -60 -70 -80 -90 10k 100k 1M FREQUENCY (Hz) 10M VCC VEE
60 40 20 AMPLITUDE (dB) 0 -20 -40 -60 -80 -100 -120 -140
60
100M
0.1
1
10
100
1000
0.1
1
10
100
1000
FREQUENCY (MHz)
FREQUENCY (MHz)
SMALL-SIGNAL PULSE RESPONSE
(CL = 0pF, RL = 5k)
MAX14141 TOC-07
SMALL-SIGNAL PULSE RESPONSE
(CL = 47pF, RL = )
MAX14141 TOC-09
LARGE-SIGNAL PULSE RESPONSE
(CL = 0pF, RL = 5k)
MAX14141 TOC-08
IN (2.5V/div)
GND
VOLTS (100mV/div)
VOLTS (100mV/div)
VOLTS GND OUT (1V/div)
TIME (5ns/div)
TIME (5ns/div)
TIME (5ns/div)
4
_______________________________________________________________________________________
330MHz, 4x1 Precision Video Multiplexer
____________________________Typical Operating Characteristics (continued)
(TA = +25C, unless otherwise noted.)
LARGE-SIGNAL PULSE RESPONSE
(CL = 47pF, RL = )
MAX4141
ENABLE/DISABLE DELAY TIME
MAX14141 TOC-11 MAX14141 TOC-10
OUTPUT GLITCH AMPLITUDE
MAX14141 TOC-12
IN 2.5V/div
GND 2V/div OUTPUT
ENABLE ON
AMPLITUDE
VOLTS OUT (1V/div) GND
GND IN0 ON 1V/div
2V/div
A0
10mV/div
OUTPUT
TIME (10ns/div)
TIME (1s/div)
TIME (1s/div)
NOISE VOLTAGE vs. FREQUENCY
MAX4141 TOC-13
SUPPLY CURRENT vs. TEMPERATURE
MAX4141 TOC-14
GAIN vs. INPUT VOLTAGE AND TEMPERATURE
TA = 0C -0.090 TA = +25C GAIN (dB) -0.095
MAX4141 TOC-15
100
5.0 4.8 SUPPLY CURRENT (mA) 4.6 4.4 4.2 4.0 3.8 3.6 IEE ICC
-0.085
NOISE VOLTAGE (nV Hz)
30
10
-0.100
TA = +70C
3
-0.105 -0.110 0 10 20 30 40 50 60 70 -3 -2 -1 0 1 2 3 TEMPERATURE (C) INPUT VOLTAGE (V)
1 1 100 10k 1M 100M 10G FREQUENCY (Hz)
3.4
BANDWIDTH vs. LOAD CAPACITANCE
RL = OPEN 300 BANDWIDTH (MHz) 250 200 150 -3dB BW 100 50 0 0 20 40 60 80 100 LOAD CAPACITANCE (pF) GAIN (dB)
MAX4141 TOC-16
GAIN vs. LOAD RESISTANCE
-0.2 -0.4 -0.6 -0.8 -1.0 -1.2
MAX4141 TOC-17
350
0
-0.1dB BW
-1.4 -1.6 0 1 2 RL(k) 3 4 5
_______________________________________________________________________________________
5
330MHz, 4x1 Precision Video Multiplexer MAX4141
______________________________________________________________Pin Description
PIN 1 2, 4, 6 3 5 7 8 9 10 11 12 13 14 FUNCTION IN0 GND IN1 IN2 IN3 N.C. EN VEE OUT VCC A1 A0 Signal Input Analog (Signal) Ground. Since inputs are isolated by these grounds, they should be as noise-free as possible. Signal Input Signal Input Signal Input No Connect--not internally connected. Output Enable and device shutdown. A logic high on this pin enables the output. A logic low causes the output to assume a high-impedance state and reduces operating current. Negative Power-Supply Voltage. Decouple to power ground. Signal Output Positive Power-Supply Voltage. Decouple to power ground. Channel Selection Bit. See truth tables. Channel Selection Bit. See truth tables. DESCRIPTION
_______________Detailed Description
The MAX4141 video switch is manufactured with Maxim's proprietary complementary bipolar process that yields high bandwidth and low capacitance. To maintain a wide bandwidth, the MAX4141 incorporates a straightforward structure of input and output buffers. Make-before-break switching is employed to reduce noise and glitches, even when switching from part to part in large arrays. The input buffers provide a constant, high input impedance. And, they prevent the make-before-break action from feeding back to the input and causing noise and/or glitches. The design of the switching mechanism limits the inevitable glitch to within 13mVp-p. In addition, the glitch pulse is positive to avoid confusion with any negative sync pulses. Unity-gain output buffers isolate other inputs from the switching action of large multiplex arrays. These buffers can drive 5k resistive loads. Load capacitance is limited only by system bandwidth requirements. The MAX4141 does not contain buffer latches. The digital inputs control the switch transparently.
__________Applications Information
Grounding, Bypassing, and PC Board Layout
In order to obtain the MAX4141's full 330MHz bandwidth, Microstrip and Stripline techniques are recommended in most cases. To ensure your PC board does not degrade the switch's performance, it's wise to design the board for a frequency greater than 1GHz. Even with very short runs, it's good practice to use this technique at critical points, such as inputs and outputs. Whether you use a constant-impedance board or not, observe the following guidelines when designing the board: * Do not use wire-wrap boards, because they are too inductive. * Do not use IC sockets. They increase parasitic capacitance and inductance. * In general, surface-mount components have shorter leads and lower parasitic reactance, and give better high-frequency performance than through-hole components. * The PC board should have at least two layers, with one side a signal layer and the other a ground plane. * Keep signal lines as short and as straight as possible. Do not make 90 turns; round all corners. * The ground plane should be as free from voids as possible.
6
_______________________________________________________________________________________
330MHz, 4x1 Precision Video Multiplexer
On Maxim's evaluation kit, the ground plane has been removed from areas where keeping the trace capacitance to a minimum is more important than maintaining ground continuity. For example, the ground plane has been removed from beneath the IC to minimize pin capacitance. The signal input line is approximately 0.103 inches wide to minimize inductance and to provide a constant 50 impedance path. It is terminated by a 50 chip resistor.
Creating Large Arrays
The MAX4141 was designed as a building block for large arrays. The high-power drive required for internal cable drivers has a negative effect on crosstalk and increases system power consumption. Figure 1 shows an 8x1 multiplexer circuit. Even though the MAX4141 drives capacitive loads, you may want to limit the number of switches connected together to maximize bandwidth. The MAX4141 has a finite input capacitance of about 3pF and a dynamic output resistance of about 20. This causes a pole at a little more than 2.6GHz. However, in a large array with many switch inputs, the total capacitance is (N x 3pF), where "N" is the number of switches connected in parallel. The pole will be located at:
2 x N x 3pF + C STRAY x 20
MAX4141
Bypass Components--Capacitors
Electrolytic and tantalum capacitors are available from 0.1F to over 300F, but have resonant frequencies below 1MHz. Ceramic capacitors are highly recommended and are available to 1F, with the smaller values having resonant frequencies to almost 1GHz. The less expensive capacitors are constructed using a multilayer approach; high values are available, but resonant frequencies beyond a few hundred megahertz are not, because of the inductive effect of the multiple layers. More expensive, solid dielectric microwave porcelain/ceramic capacitors are available up to 1000pF with resonant frequencies beyond 20GHz. In all types, resonant frequency depends on capacitor value, voltage rating, and physical size; the larger the capacitor, the lower the resonant frequency. We recommend ceramic surface-mount/chip capacitors. Placement of bypass capacitors on the PC board is critical, and the smaller chip capacitors allow placement as close to the part as practical. The smaller, higher frequency capacitors should be placed as close to the chip as possible, with the higher-value capacitors placed farther away.
(
1
)
MHz
where CSTRAY is the stray capacitance from the interconnect. If the maximum number of switches that may be connected while still maintaining bandwidth is less than your system requirements, use a unity-gain buffer amplifier to isolate the switch from the remainder of the inputs.
Table 1. Truth Table
A1 X 0 0 1 1 A0 X 0 1 0 1 EN 0 1 1 1 1 OUT High-Z IN0 IN1 IN2 IN3
_______________________________________________________________________________________
7
330MHz, 4x1 Precision Video Multiplexer MAX4141
IN0 1 75 GND 2 IN1 3 75 GND 4 IN2 5 75 GND 6 IN3 7
A0 14 A1 10F
VEE VCC 10F
MAX4141
13 VCC 12 OUT 11 VEE 10 EN 9 N.C. 8 OUT (TO CABLE DRIVER OR OTHER SWITCHES) 1000pF 1000pF
75
IN0 1 75 GND 2 IN1 3 75 GND 4 IN2 5 75 GND 6 75 IN3 7 EN2 EN1 A1 A0
A0 14 A1
MAX4141
13 VCC 12 1000pF OUT
11 VEE 10 EN 9 N.C. 8 1000pF
Figure 1. 8x1 Multiplexer Circuit
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.
8 ___________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 (c) 1995 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

▲Up To Search▲

Price & Availability of MAX4141

	To Download MAX4141 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .