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SGM9110
PRODUCT DESCRIPTION
The SGM9110 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 SGM9110 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). SGM9110 employs an internal level shift circuit that avoids sync-pulse clipping and allows DC-coupled output. If AC-coupling is preferred, the SGM9110 offers a sag-correction feature that significantly reduces the size of the output coupling capacitor. SGM9110 has a power-down disable feature that reduces the supply current to 2A, dramatically reducing power consumption and prolonging battery life. It is specified over the extended -40C to +125C temperature range.
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 SAG Correction Reduces AC Coupling Capacitor size 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 SGM9110 2A when Disabled Small Packaging SGM9110 Available in SC70-6
*
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
PIN CONFIGURATIONS (Top View)
+VS DISABLE
IN
3-Pole Filter
Level Shifter
+IN
OUT
SGM9110
1 6 +VS DISABLE OUT
9110
GND
2 3
5 4
6dB
SAG
SAG
SGM9110
GND
SC70-6
Shengbang Microelectronics Co, Ltd Tel: 86/451/84348461 www.sg-micro.com
REV. A
ELECTRICAL CHARACTERISTICS: VS = +3.3V
(At RL = 150 connected to GND, and CIN = 0.1F, unless otherwise noted)
SGM9110 PARAMETER CONDITION 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) SAG Correction DC Gain to VOUT( ASAG) Input Offset Voltage Drift (VOS/T) IIN = -1mA VIN = VCLAMP -100mV VIN = 500mV 0.5V VIN 1.0V RL = 150 SAG open 2.0 1.97 2.03 1.968 2.032 1.966 2.034 1.93 2.07 -61 -2.7 4 -65 -2.8 5 -70 -2.82 6 -73 -2.84 6.5 -80 -2.86 7 VIN = 0V, no load 106 130 135 145 175 mV pA mV mA A M V/V 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) Supply Current when Disabled 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 POWER-DOWN DISABLE Disabled (logic-LOW Threshold)
Disabled (logic-HIGH Threshold) Disable Time Disable Time Disable Current
MIN/MAX OVER TEMPERATURE +25 0 to70 -40 to 85 -40 to125 UNITS MIN/ MAX
MAX TYP MIN MIN MAX MIN MIN MAX TYP TYP MIN MIN MAX MIN MAX MIN MAX MAX TYP TYP TYP TYP TYP TYP TYP TYP TYP TYP TYP TYP MAX MIN TYP TYP MAX
OUTPUT CHARACTERISTICS
Output Voltage High Swing Output Short-Circuit Current (ISC) 3.05 100 -108 2.7 5.5 61 3.03 4.5 3.03 95 -107 2.7 5.5 60 3.12 5 3.0 90 -105 2.7 5.5 58 3.39 6 V mA mA V V dB mA A MHz MHz dB dB V/s % % ns ns ns 0.8 1.6 360 90 20 V V ns ns nA
POWER SUPPLY
Operating Voltage Range Vs = +2.7 V to + 5.5 V VIN = 500mV, Disabled = Vs, no load Disabled = 0V RL = 150, CL = 5pF RL = 150, CL = 5pF 70 2.65 2 4.4 8.0 +0.15 -22 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% Vs = +2.7 V to + 3.3 V Vs = +2.7 V to + 3.3 V VIN = 500mV, VOUT to 1% VIN = 500mV, VOUT to 1%
Disable pin = 0V
62 2.94 4
40 0.46 1.2 0.8 1.0 8 30 40
Specifications subject to change without notice.
SGM9110
PACKAGE/ORDERING INFORMATION
ORDER NUMBER PACKAGE DESCRIPTION TEMPERATURE RANGE PACKAGE OPTION MARKING INFORMATION
SGM9110XC6/TR
SC70-6
-40 to +125
Tape and Reel, 3000
9110
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 . . . . . . -40 to +125 Power Dissipation, PD @ TA = 25 SC70-6 ..........................................................................0.3W Package Thermal Resistance SC70-6, JA............................................................ 330/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.
SGM9110
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
30 20 10 0
Gain vs. Frequency -3dB
SAG Open -3dB BW @ 10.7MHz
2 1.5 1
Large-Signal Disable/Enable Response
Enable Signal
-10 -20 -30 -40 -50 -60 0.1 1 10 100 1000
Output Voltage(500mV/div) Output Voltage(500mV/div)
Gain(dB)
0.5 0
SAG Close -3dB BW @ 8MHz
-0.5 -1
Output Signal Disable Signal
-1.5 -2 -3 -2 -1 0
Frequency(MHz)
Time(1s/div)4 1 2 3 Time(1s/div)
5
6
7
SGM9110
TYPICAL PERFORMANCE CHARACTERISTICS
At VS = +3.3V, TA = +25, RL = 150, CL = 5pF unless otherwise noted.
Large Signal Step Response
1.25 1 0.75 0.5 0.25 0 -0.25 0 100 200 300 400 500 600 0 0 100 200 300 400 500 600 0.4
Small Signal Step Response
Output Voltage(V/)
Time (ns)
Output Voltage(V/)
0.3
0.2
0.1
Time (ns)
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
1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0
Gain Error vs. Temperature
Quiescent Current (mA)
Gain Error(%)
2.5
3
3.5
4
4.5
5
5.5
-50
-25
0
25
50
75
100
125
Supply Voltage(V)
Temperature()
5 4.5
Quiescent Current vs. Temperature
3 2.5 2 1.5 1 0.5 0
Shutdown Current vs. Temperature
Quiescent Current (mA)
4 3.5 3 2.5 2 1.5 1 -50 -25 0 25 50 75 100 125
Shutdown Current (A)
-50
-25
0
25
50
75
100
125
Temperature()
Temperature()
SGM9110
TYPICAL PERFORMANCE CHARACTERISTICS
At VS = +3.3V, TA = +25, RL = 150, CL = 5pF unless otherwise noted.
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
Output Voltage Swing to The Negative Rail vs. Output Current
1 0.9 0.8
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)
SGM9110
Application Information
The SGM9110 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 SGM9110 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 SGM9110 output can drive an AC or DC-coupled doubly terminated coax (150) load see Figure 1 DC-coupling the . output removes the need for an expensive and large output coupling capacitorsee Figure 2. If an AC-coupled output is needed, the SAG correction circuit can be used to reduce the AC output coupling capacitor value. Offering SAG correction, fixed gain of 6dB, and a 3-pole low pass filter in a tiny space saving package makes the SGM9110 well suited for space sensitive applications such as digital cameras,cellular phones and other portable devices.
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 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 SGM9110 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 SGM9110 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.
Enable/Shutdown
The SGM9110 has a shutdown feature that disables the output and reduces the quiescent current to 2A. This feature is particularly useful in portable applications, such as video cameras, hand held gaming devices, cellular phones and requiring video filtering and drive capability.
+VS
+VS
+VS
C3
IN
0.1F IN RIN CIN R1 R2 C1 R3
VDC OUT C2 R4 SAG R6 R7 R5 C5 = 22F
AC COUPLING CAPACITOR
C4 = 47F
ROUT 75 RL 75
SYNC CLAMP
SALLEN KEY LOW PASS FILTER
DISABLE
DISABLE = GND: SHUTDOWN I+ ~ 0 DISABLE = +VS: ACTIVE I+ ~ 2.65mA
GND
SAG NETWORK
Figure 1. Typical Application Diagram
SGM9110
+VS
+VS
+VS
C3
IN
0.1F IN RIN CIN R1 R2 C1 R3
VDC OUT C2 R4 SAG R6 R7 R5 ROUT 75 RL 75
SYNC CLAMP
SALLEN KEY LOW PASS FILTER
DISABLE
DISABLE = GND: SHUTDOWN I+ ~ 0 DISABLE = +VS: ACTIVE I+ ~ 2.65mA
GND
SAG NETWORK
Figure 2. AC-Coupled Input/DC-Coupled Output
SAG Correction
The SGM9110 can use the SAG configuration if an AC-coupled output video signal is needed. SAG correction refers to the low-frequency compensation for the high pass filter formed by the 150 load and the output capacitor. In video applications, the cutoff frequency must be low enough to pass the vertical sync interval to avoid field tilt. This cutoff frequency should be less than 5Hz, and the coupling capacitor must be very large in normal configuration, typically is 220F. In SAG configuration, the SGM9110 removes the need for large coupling capacitors, and instead needs one 22F and one 47uF capacitors (Figure 1) to reach the same performance as the large capacitor.
Layout and Power-Supply Bypassing
The SGM9110 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 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:
*
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 SGM9110, 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.
Do not use IC sockets; they increase parasitic capacitance and inductance. * Do not use wire-wrap boards; they are too inductive.
* 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.
SGM9110
PACKAGE OUTLINE DIMENSIONS
SC70-6
D e1 e L
Symbol
A A1 A2 b c
Dimensions In Millimeters Min Max
0.900 0.000 0.900 0.150 0.080 2.000 1.150 2.150 1.200 0.260 0 1.100 0.100 1.000 0.350 0.150 2.200 1.350 2.450 1.400 0.460 8
Dimensions In Inches Min Max
0.035 0.000 0.035 0.006 0.003 0.079 0.045 0.085 0.047 0.010 0 0.043 0.004 0.039 0.014 0.006 0.087 0.053 0.096 0.055 0.018 8
E1
E
D E E1
L1
b A1 C
e
0.650TYP 0.525REF
0.026TYP 0.021REF
0.20
e1 L L1
A2
A
SGM9110
REVISION HISTORY
Location 11/06-- Data Sheet changed from preliminary to REV. A
Changes to ABSOLUTE MAXIMUM RATINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Page
Shengbang Microelectronics Co, Ltd
Unit 3, ChuangYe Plaza No.5, TaiHu Northern Street, YingBin Road Centralized Industrial Park Harbin Development Zone Harbin, HeiLongJiang 150078 P.R. China Tel.: 86-451-84348461 Fax: 86-451-84308461 www.sg-micro.com
SGM9110

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