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SGM9123
GENERAL DESCRIPTION
SGM9123 is a video buffer which integrates triple 6dB Gain rail-to-rail output driver and triple 3rd output reconstruction filter, it has 8MHz -3dB bandwidth and 44V/s slew rate. SGM9123 provides improved image quality compared with passive LC filters and discrete drivers solution. Operating from single supplies ranging from +2.5V to +5.5V and sinking an ultra-low 7.4mA quiescent current, the SGM9123 is ideally suited for battery powered applications. SGM9123 can be DC-coupled or AC-coupled with input video signal, such as the output stage of DAC to eliminate out-of-band noise. Internal diode clamps and bias circuitry may be used if AC-coupled inputs are required. SGM9123 also integrates an internal level shift circuit which avoids sync-pulse being clipped and allows DC-coupled output. The drivers in SGM9123 can drive DC or AC-coupled single (150) or dual (75 ) loads. The SGM9123 has lead (Pb) free SO-8 package and ESD (HBM) reaches 8KV. * * * * * * * * *
Triple, 8MHz, 3rd Order SDTV Video Filter Drivers
FEATURES
Triple 3rd order 8MHz (SD) Filters Transparent Input Clamping 6dB Output Driver Gain and Drive Dual Video Load Rail-to-Rail Output Input Voltage Range Includes Ground AC or DC Coupled Inputs AC or DC Coupled Outputs Operates from 2.5V to 5.5V Single Power Supply Low Power (2.5mA/channel) 7.4mA Total Supply Current * Lead (Pb) Free SO-8 Package
APPLICATIONS
Video Amplifiers Cable and Satellite Set Top Boxes Communications Devices Video on Demand Portable and Handheld Products Personal Video Recorders DVD Players SDTVs
BLOCK DIAGRAM
SG Microelectronics Co, Ltd Tel: 86/10/51798160/80 www.sg-micro.com
REV. A
ELECTRICAL CHARACTERISTICS: VS = +5.0V
(At RL = 150 connected to GND, VIN = 1Vppand CIN = 0.1F, all outputs AC coupled with 220Funless otherwise noted)
SGM9123 PARAMETER CONDITIONS TYP +25
INPUT CHARACTERISTICS Output Level Shift Voltage (VOLS) Input Voltage Clamp (VCLAMP) Clamp Charge Current Voltage Gain ( AV) VIN = 0V, no load IIN = -1mA VIN = VCLAMP -100mV RL = 150 258 -13 -5.60 2.0 419 -27 -8.2 1.89 2.07 423 -27.6 -8.23 1.88 2.08 4.13 65 92 2.7 5.5 48 10.5 440 -28.7 -8.24 1.87 2.09 4.12 63 90 2.7 5.5 46 10.7 mV mV mA V/V V/V V mA mA V V dB mA MHz MHz dB dB V/s % % ns dB ns ns MAX MIN MIN MIN MAX MIN MIN MIN MIN MAX MIN MAX TYP TYP TYP TYP TYP TYP TYP TYP TYP TYP TYP TYP TYP
MIN/MAX OVER TEMPERATURE 0 -40 MIN/ +25 to+70 to+85 UNITS MAX
OUTPUT CHARACTERISTICS
Output Voltage High Swing Output Short-Circuit Current (ISC) VIN = 3V, RL = 150 to GND VIN = 3V, to GND through 10 VIN = 100mV, out short to VDD through 10 4.42 110 162 4.15 68 102 2.5 5.5 Power Supply Rejection Ratio (PSRR) Quiescent Current (IQ) DYNAMIC PERFORMANCE 0.1dB Bandwidth -3dB Bandwidth Filter Response Normalized Gain: fIN = 4.5MHz fIN = 27MHz Slew Rate Differential Gain (DG) Differential Phase (DP) Group Delay Variation (D/DT) Crosstalk (channel - to - channel) Fall Time Rise Time 20% to 80%, VIN = 1V Step, NTSC & PAL DC coupled NTSC & PAL AC coupled NTSC & PAL DC coupled NTSC & PAL AC coupled f = 400KHz, 6.5MHz at 1MHz 2.0VSTEP, 80% to 20% 2.0VSTEP, 80% to 20% +0.2 -25 44 0.2 0.52 0.4 1.0 17.5 -64 36 38 RL = 150 RL = 150 5.4 8.0 Vs = +2.7V to + 5.5V VIN = 500mV, 66 7.4 51 9.5
POWER SUPPLY
Operating Voltage Range
Specifications subject to change without notice.
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SGM9123
PACKAGE/ORDERING INFORMATION
ORDER NUMBER SGM9123XS/TR PACKAGE DESCRIPTION SO-8 TEMPERATURE RANGE -40 to +125 PACKAGE OPTION Tape and Reel, 2500 MARKING INFORMATION SGM9123XS
PIN CONFIGURATION (Top View)
PIN DESCRIPTION
PIN 1 2 3 4 5 6 7 8 NAME IN1 IN2 IN3 +VS GND OUT3 OUT2 OUT1 FUNCTION Video input, channel 1 Video input, channel 2 Video input, channel 3 Power supply Ground Filtered output, channel 3 Filtered output, channel 2 Filtered output, channel 1
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V+ to V- .......................................... 6.5V Input Voltage .......................... GND - 0.3 V to (+VS) +0.3V Storage Temperature Range..................-65 to +150 Junction Temperature ............................................. 160 Operating Temperature Range ........... -40 to +125 Power Dissipation, PD @ TA = 25 SO-8 .............................................................................0.8W Package Thermal Resistance SO-8, JA................................................................ 125/W Lead Temperature Range (Soldering 10sec) ...................................................... 260 ESD Susceptibility HBM...........................................................................8000V MM...............................................................................400V
NOTES 1. Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
CAUTION
This integrated circuit can be damaged by ESD if you don't pay attention to ESD protection. SG Micro-electronics recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
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SGM9123
TYPICAL PERFORMANCE CHARACTERISTICS
At VS = +5.0V, TA = +25, RL = 150, all outputs AC coupled with 220F, unless otherwise noted.
Frequency Response
3 0
270 180
Phase vs. Frequency
Normalized Gain (dB)
Phase (degree)
0.1 1 10 100
-3 -6 -9 -12 -15 0.01
90 0 -90 -180 -270 0.1 1 10 100
Frequency (MHz)
Frequency (MHz)
Large Signal Step Response
0.75 0.5
0.3 0.2
Small Signal Step Response
Output Voltage(V/)
0.25 0 -0.25 -0.5 -0.75 -0.5 -0.4 -0.3 -0.2 -0.1
Output Voltage(V/)
0 0.1 0.2 0.3 0.4 0.5
0.1 0 -0.1 -0.2 -0.3 -0.5 -0.4 -0.3 -0.2 -0.1
Time (s)
0
0.1 0.2 0.3 0.4 0.5
Time (s)
-40 -45 -50 -55
PSRR vs. Frequency (Bypass Caps)
0 -10 -20
PSRR vs. Frequency (No Bypass Caps)
PSRR (dB)
-65 -70 -75 -80 -85 -90 0.01 0.1 1 10 100
PSRR (dB)
-60
-30 -40 -50 -60 -70 -80 0.01
Frequency (MHz)
0.1
1
10
100
Frequency (MHz)
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SGM9123
TYPICAL PERFORMANCE CHARACTERISTICS
At VS = +5.0V, TA = +25, RL = 150, all outputs AC coupled with 220F, unless otherwise noted.
Gain Error vs. Temperature
2 1.8 1.4 1.2 1 0.8 0.6 0.4 0.2 0 -40 -15 10 35 60 85 110 1.6
9 8.5 8 7.5 7 6.5 6 5.5 5 4.5 4 2.5
Quiescent Current vs. Supply Voltage
Quiescent Current (mA)
Gain Error (%)
Temperature ()
3
3.5
4
4.5
5
5.5
Supply Voltage (V)
50 45 40
Group Delay vs. Frequency
12 11
Quiescent Current vs. Temperature
Quiescent Current (mA)
0.1 1 10
10 9 8 7 6 5 4 3 2 -40 -15 10 35 60 85 110
Group Delay (ns)
35 30 25 20 15 10 0.01
Frequency (MHz)
Temperature ()
Output Voltage Swing to The Negative Rail vs. Output Current
1.2 1
Output Voltage Swing to The Positive Rail vs. Output Current
5 4.75
-40 +25 +85
Output Voltage (v)
0.8 0.6 0.4 0.2 0 0 20
Output Voltage (v)
4.5 4.25 4 3.75 3.5 3.25 3
+85 +25 -40
0 20 40 60 80 100
Output Current (mA)
40
60
80
100
Output Current (mA)
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SGM9123
Applications Information Functional Description
SGM9123 operates from a single +2.5V to +5V supply. In application, SGM9123 is a fully integrated solution for filtering and buffering SDTV signals in front of video decoder or behind video encoder. For example, SGM9123 can replace three passive LC filters and three amplifier drivers at CVBS and S-video output side in set-top box and DVD player, this solution can help you save PCB size and production cost, it also improves video signal performance comparing with traditional design using discrete components. SGM9123 features a DC-coupled input buffer, 3-pole low-pass filter to eliminate out-of-band noise of video encoder, and a gain of +6dB in the output amplifier to drive 75 load. The AC or DC-coupled input buffer eliminates sync crush, droop, and field tilt. The output of SGM9123 also can be DC-coupled or AC-coupled.
Typical Application Diagram
The following schematic in Figure 3 is normally used for AC coupled output and DC-coupled input with DAC which has an output voltage range of 0V to 1.4V. AC coupled output offer slightly lower power dissipation and high ESD protection ability. The schematics in Figure 1 and Figure 2 are also popular in design. Figure 4 is a kind of special application in STB.
+5V 0.1F or 0.01F 4 +VS CVBS1 75 2 1 IN1 OUT1 8 75 CVBS1 10F
SGM9123
IN2 OUT2 7 75 Y S-Video 3 IN3 OUT3 GND 5 6 75 C
Y 75
S-Video
Input Considerations
Besides AC coupling, the SGM9123 inputs also can be DC-coupled. In DC coupling application, No input coupling capacitors are needed because the amplitude of input video signal from DAC includes ground and extends up to 1.4V, then SGM9123 can be directly connected to the output of a single-supply, current-output DAC without any external bias network. Some time, if DAC's output level exceeds the range of 0V to 1.4V, or SGM9123 is driven by an unknown external source or a SCART switch which has its own clamping circuit, AC coupling is needed in such applications.
C 75
Figure 1. DC Coupling Application Schematic
Output Considerations
The SGM9123 outputs can be DC-coupled or AC-coupled. When 0V is input, the SGM9123 output voltage is 260mV typically. In DC coupling design, one 75 resistor is used to Connect SGM9123's output pin with external load directly, this serial back-termination resistor is used to match the impedance of the transmission line between SGM9123 and external load to cancel the signal reflection. The SGM9123 outputs can sink and source current allowing the device to be AC-coupled with external load, in AC coupling, 220F at least capacitor will be used in order to eliminate field tilt.
Figure 2. AC Coupling Application Schematic
+5V 0.1F or 0.01F 4 +VS CVBS1 75 2 1 IN1 OUT1 8 75 220F CVBS1 10F
Power-Supply Bypassing and Layout
Correct power supply bypassing is very important for optimizing video performance in design. One 0.1F and one 10F capacitors are always used to Bypass VCC pin of SGM9123, please place these two capacitors as close to the SGM9123 output pin as possible, a large ground plane is also needed to ensure optimum performance. The input and output termination resistors should be placed as close to the related pin of SGM9123 as possible to avoid performance degradation. The PCB traces at the output side should have 75 characteristic impedance in order to match the 75 characteristic impedance cable connecting external load. In design, please keep the board trace at the inputs and outputs of the SGM9123 as short as possible to minimize the parasitic stray capacitance and noise pickup.
SGM9123
IN2 OUT2 7 75 220F S-Video 3 IN3 OUT3 GND 5 6 75 220F C Y
Y 75
S-Video C
75
Figure 3. Input DC Coupling and Output AC Coupling Application Schematic
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SGM9123
Figure 4. Input DC Coupling and Output AC Coupling Application Schematic in STB
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SGM9123
PACKAGE OUTLINE DIMENSIONS
SO-8
D C
Symbol
L
Dimensions In Millimeters Min Max
1.750 0.250 1.550 0.510 0.250 5.000 4.000 6.300 1.270 8 1.350 0.100 1.350 0.330 0.190 4.780 3.800 5.800 0.400 0
Dimensions In Inches Min
0.053 0.004 0.053 0.013 0.007 0.188 0.150 0.228 0.016 0
Max
0.069 0.010 0.061 0.020 0.010 0.197 0.157 0.248 0.050 8
A A1
E1
A2 B C
E
e
D E E1
B A2 A1
e L
1.270TYP
0.050TYP
A
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SGM9123
REVISION HISTORY
Location 11/2007-- Preliminary Data Sheet Page
01/2008-- Data Sheet REV.A
SG Microelectronics Co., Ltd
A2608, NO.72 North Road Xisanhuan, Haidian District, Beijing, China 100037 Tel: 86-10-51798160/80 Fax: 86-10-51798180-803
www.sg-micro.com
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SGM9123

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