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SGM9111
PRODUCT DESCRIPTION
The SGM9111 is single rail-to-rail 3-pole output reconstruction filter with a -3dB bandwidth of 8MHz and a slew rate of 40V/s. Operating from single supplies ranging from +2.5V to +5.5V and sinking an ultra-low 2.65mA quiescent current, the SGM9111 is ideally suited for low power, battery-operated applications. The output swings within 100mV of GND and 170mV to V+ with a standard back-terminated video load (150). SGM9111 employs an internal level shift circuit that avoids sync-pulse clipping and allows DC-coupled output. It has lead (Pb) free SO-8 package.
8MHz Rail-to-Rail Composite Video Driver with 6dB Gain
FEATURES
* * * * * * Low Cost Excellent Video Performance 3-Pole Reconstruction Filter Internal Gain: 6dB Rail-to-Rail Output Input Voltage Range Includes Ground AC-Coupled Input * Operates on 2.5 V to 5.5 V Single-Supplies * Low Power 2.65 mA Typical Supply Current * Small Packaging SGM9111 Available in SO-8
APPLICATIONS
Video amplifiers Cable and Satellite set top boxes Communications devices Video on demand Portable and handheld products Personal video recorders DVD players HDTV
BLOCK DIAGRAM
+VS =2.5V to 5.5V
+VS
PIN CONFIGURATION (Top View)
SGM9111
OUT
IN
3-Pole Filter
Level Shifter
IN NC GND NC 1 2 3 4
8 7 6 5
NC = NO CONNECT
OUT +VS NC NC
6dB
SGM9111
GND
SO-8
SG Microelectronics Co, Ltd Tel: 86/10/51798160/80 www.sg-micro.com
Rev. C
ELECTRICAL CHARACTERISTICS: VS = +3.3V
(At RL = 150 connected to GND, and CIN = 0.1F, Cout=220F, unless otherwise noted)
SGM9111 PARAMETER CONDITIONS TYP +25
INPUT CHARACTERISTICS Output Level Shift Voltage (VOLS) Input Bias Current (IB) Input Voltage Clamp (VCLAMP) Clamp Charge Current Clamp Discharge Current Input Resistance (RIN) Voltage Gain ( AV) Input Offset Voltage Drift (VOS/T) IIN = -1mA VIN = VCLAMP -100mV VIN = 500mV 0.5V VIN 1.0V RL = 150 2.0 1.97 2.03 1.968 2.032 1.966 2.034 -61 -2.7 4 -65 -2.8 5 -70 -2.82 6 -73 -2.84 6.5 VIN = 0V, no load 106 130 135 145 mV pA mV mA A M V/V V/V V/ VIN = 2V, RL = 150 to GND VIN = 2V, to GND through 10 VIN = 100mV, out short to VDD through 10 3.13 -105 120 3.1 -100 110 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 Error (DG) Differential Phase Error (DP) Group Delay Variation (D/DT) Fall Time Rise Time 10% to 90%, VIN = 1V Step, NTSC & PAL DC coupled NTSC & PAL AC coupled NTSC & PAL DC coupled NTSC & PAL AC coupled f = 100kHz, 5MHz 2.5VSTEP, 80% to 20% 2.5VSTEP, 80% to 20% +0.15 -22 40 0.46 1.2 0.8 1.0 8 30 40 dB dB V/s % % ns ns ns TYP TYP TYP TYP TYP TYP TYP TYP TYP TYP RL = 150, CL = 5pF RL = 150, CL = 5pF 4.4 8.0 MHz MHz TYP TYP Vs = +2.7 V to + 5.5 V VIN = 500mV, no load 70 2.65 62 2.94 3.05 -100 108 2.7 5.5 61 3.03 3.03 -95 107 2.7 5.5 60 3.12 V mA mA V V dB mA MAX TYP MIN MIN MAX MIN MIN MAX TYP MIN MAX MIN MIN MAX MIN MAX
MIN/MAX OVER TEMPERATURE +25 0 to70 -40 to+85 UNITS MIN / MAX
OUTPUT CHARACTERISTICS
Output Voltage High Swing Output Short-Circuit Current (ISC)
POWER SUPPLY
Operating Voltage Range
Specifications subject to changes without notice.
SGM9111
PACKAGE/ORDERING INFORMATION
ORDER NUMBER SGM9111YS/TR SGM9111ZS/TR PACKAGE DESCRIPTION SO-8 SO-8 TEMPERATURE RANGE -40 to +85 0 to +70 PACKAGE OPTION Tape and Reel, 2500 Tape and Reel, 2500 MARKING INFORMATION SGM9111YS SGM9111ZS
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V+ to V- ..........................................7.5 V Input Voltage ........................................GND - 0.3 V to (+VS) +0.3V Storage Temperature Range ................ -65 to +150 Junction Temperature...............................................160 Operating Temperature Range SGM9111YS .............................................. -40 to +85 SGM9111ZS ...................................................0 to +70 Package Thermal Resistance SO-8, JA................................................................ 125/W Lead Temperature Range (Soldering 10 sec) ..................................................... 260 ESD Susceptibility HBM...........................................................................1000V 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. Shengbang 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.
SGM9111
TYPICAL PERFORMANCE CHARACTERISTICS
At VS = +3.3V, TA = +25, RL = 150, CL = 5pF unless otherwise noted.
Frequency Response
3 0
270 180
Phase vs. Frequency
Normalized Gain(dB)
Phase(degree)
-3 -6 -9 -12 -15 0.01
90 0 -90 -180 -270
0.1
1
10
100
0.1
1
10
100
Frequency(MHz)
Frequency(MHz)
-40 -45 -50 -55
PSRR vs. Frequency
50 45 40
Group Delay vs. Frequency
Group Delay (ns)
0.1 1 10 100
PSRR(dB)
-60 -65 -70 -75 -80 -85 -90 0.01
35 30 25 20 15 10 0.01
Frequency(MHz)
0.1
Frequency(MHz)
1
10
Large Signal Step Response
1.25 1
Small Signal Step Response
0.4
Output Voltage(V/)
0.75 0.5 0.25 0 -0.25 0 100 200 300 400 500 600
Output Voltage(V/)
0.3
0.2
0.1
0 0 100 200 300 400 500 600
Time (ns)
Time (ns)
SGM9111
TYPICAL PERFORMANCE CHARACTERISTICS
At VS = +3.3V, TA = +25, RL = 150, CL = 5pF unless otherwise noted.
1 0.9 0.8
Gain Error vs. Temperature
5 4.5
Quiescent Current vs. Temperature
Quiescent Current (mA)
-40 -15 10 35 60 85
Gain Error(%)
0.7 0.6 0.5 0.4 0.3 0.2 0.1 0
4 3.5 3 2.5 2 1.5 1 -40 -15 10 35 60 85
Temperature()
Temperature()
Output Voltage Swing to The Positive Rail vs. Output Current
3.3 3.2 3.1 3 2.9 2.8 2.7 2.6 2.5 2.4 2.3 2.2 2.1 2 0 0.02 1 0.9 0.8
Output Voltage Swing to The Negative Rail vs. Output Current
VIN = 0V
Output Voltage(v)
Output Voltage(v)
0.7 0.6 0.5 0.4 0.3 0.2 0.1 0
+85 +25 -40
-40 +25 +85
0.04
0.06
0.08
0.1
Output Current(A)
0
0.02
0.04
0.06
0.08
0.1
Output Current(A)
5 4.5 4 3.5 3 2.5 2 1.5 1 0.5 0 2
Quiescent Current vs. Supply Voltage
No Load VIN = 500mV
Quiescent Current (mA)
2.5
3
3.5
4
4.5
5
5.5
Supply Voltage(V)
SGM9111
Application Information
The SGM9111 low cost, integrated, 3-pole, video filter is intended to replace passive LC filters and drivers in low voltage portable video applications. The 3-pole filter provides better image quality compared to typical 2-pole solutions. The SGM9111 input must be AC-coupled because the input capacitor stores the clamp voltage. It needs a typical value of 0.1F for the input clamp to meet the Line Droop specification. The SGM9111 output can drive an AC or DC-coupled doubly terminated coax (150) loadsee Figure 1. DC-coupling the output removes the need for an expensive and large output coupling capacitorsee Figure 2.
output stage of the amplifier resulting in a clipped sync tip and degrading the video image. A larger positive reference may offset the input above its positive range. The SGM9111 features an internal sync clamp and offset function to level shift the entire video signal to the best level before it reaches the input of the amplifier stage. These features are also helpful to avoid saturation of the output stage of the amplifier by setting the signal closer to the best voltage range. The typical Application diagram of the SGM9111 in Figure 1 is divided into four sections. The first, Section A is the Sync Clamp. The AC coupled video sync signal is pulled negative by a current source at the input of the comparator amplifier. When the sync tip goes below the comparator threshold the output comparator is driven negative, The PMOS device turns on clamping sync tip to near ground level. The network triggers on the sync tip of video signal.
Internal Sync Clamp
The typical embedded video DAC operates from a ground referenced single supply. This becomes an issue because the lower level of the sync pulse output may be at a 0V reference level to some positive level. The problem is presenting a 0V input to most single supply driven amplifiers will saturate the
+VS
+VS
+VS
C3
IN
0.1F IN RIN CIN R1 R2 C1 R3
VDC OUT C2 R4 R5 COUT = 220F ROUT = 75 RL = 75
SYNC CLAMP
SALLEN KEY LOW PASS FILTER
R6 R7
GND
SAG NETWORK
Figure 1. Typical Application Diagram
SGM9111
+VS
+VS
+VS
C3
IN
0.1F IN RIN CIN R1 R2 C1 R3
VDC OUT C2 R4 R5 ROUT = 75 RL = 75
SYNC CLAMP
SALLEN KEY LOW PASS FILTER
R6 R7
GND
SAG NETWORK
Figure 2. AC-Coupled Input/DC-Coupled Output
The Sallen Key Low Pass Filter
The Sallen Key in a classic low pass configuration illustrated in Figure 1. The filter provides a very stable low pass function, and in the case of the SGM9111, a 3-pole roll-off at around 8MHz. The 3-pole function is accomplished with an RC low pass network placed in series with and before the Sallen Key. One pole provided by the RC network and poles two and three provided by the Sallen Key for a nice 3-pole roll-off at around 8MHz.
a frequency greater than 1GHz. Pay careful attention to inputs and outputs to avoid large parasitic capacitance. Whether or not you use a constant-impedance board, observe the following design guidelines:
*
Do not use IC sockets; they increase parasitic capacitance and inductance. * Do not use wire-wrap boards; they are too inductive.
Layout and Power-Supply Bypassing
The SGM9111 operates from single 2.5V to 5.5V supply. Bypass the supply with a 0.1F capacitor as close to the pin as possible. SGMC recommends using microstrip and stripline techniques to obtain full bandwidth. To ensure that the PC board does not degrade the device's performance, design it for
* Use surface-mount instead of through-hole components for better, high-frequency performance. * Use a PC board with at least two layers; it should be as free from voids as possible. * Keep signal lines as short and as straight as possible. Do not make 90 turns; round all corners.
SGM9111
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
SGM9111
REVISION HISTORY
Location 03/07-- Data Sheet changed from REV. A to REV. B
Changes to PACKAGE/ORDERING INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Page
02/08-- Data Sheet changed from REV. B to REV. C
Changes to PACKAGE/ORDERING INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..3 Changes to TYPICAL PERFORMANCE CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..5
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
SGM9111

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