ETC SGM9110

SGM9110
8MHz Rail-to-Rail Composite
Video Driver with 6dB Gain
FEATURES
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 34V/µs. Operating from single supplies
ranging from +3.0V to +5.5V and sinking an ultra-low
7mA quiescent current, the SGM9110 is ideally suited for
low power, battery-operated applications.
The output swings within 210mV of GND with a standard
back-terminated video load (150Ω). 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 to1µA, dramatically reducing
power consumption and prolonging battery life.
It is specified over the extended -40°C to +125°C
temperature range.
BLOCK DIAGRAM
+VS = 3.0V to 5.5V
+VS
IN
3-Pole
Filter
•
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Low Cost
Support DC or AC Input
Support DC or AC Output
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 3.0V to 5.5V Single-Supplies
Low Power
7mA Typical Supply Current
SGM9110 1µA when Disabled
Small Packaging
SGM9110 Available in Green 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
DISABLE
PIN CONFIGURATION (Top View)
Level
Shifter
SGM9110
OUT
6dB
1
SGM9110
GND
2
GND
SAG
3
9110
+IN
SAG
6
+VS
5
DISABLE
4
OUT
SC70-6
SG Micro Limited
www.sg-micro.com
REV. B. 2
8MHz Rail-to-Rail Composite
Video Driver with 6dB Gain
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
CAUTION
Supply Voltage, V+ to V-........................................................ 6V
Input Voltage
....................................................... GND - 0.3 V to (+VS) + 0.3V
Storage Temperature Range.............................-65℃ to +150℃
This integrated circuit can be damaged by ESD. SGMICRO
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.
Junction Temperature .......................................................160℃
Operating Temperature Range ........................ -40℃ to +125℃
Power Dissipation, PD @ TA = 25℃
SC70-6 ...............................................................................0.3W
Package Thermal Resistance
SC70-6, θJA................................................................... 330℃/W
Lead Temperature Range (Soldering 10 sec)
...........................................................................................260℃
SGMICRO reserves the right to make any change in circuit
design, specification or other related things if necessary without
notice at any time. Please contact SGMICRO sales office to get
the last datasheet.
ESD Susceptibility
HBM..................................................................................4000V
MM......................................................................................400V
NOTE:
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.
SG Micro Limited
www.sg-micro.com
2
8MHz Rail-to-Rail Composite
Video Driver with 6dB Gain
SGM9110
ELECTRICAL CHARACTERISTICS: VS = +5.0V
(At RL = 150Ω connected to GND, and CIN = 0.1µF, unless otherwise noted)
SGM9110
PARAMETER
CONDITIONS
TYP
+25℃
MIN/MAX OVER TEMPERATURE
+25℃
-40℃ to
125℃
UNITS
MIN /
MAX
INPUT CHARACTERISTICS
Output Level Shift Voltage (VOLS)
VIN = 0V, no load
340
480
705
mV
MAX
Input Voltage Clamp (VCLAMP)
IIN = -3.5mA
-115
-180
-266
mV
MIN
Clamp Charge Current
VIN = VCLAMP -100mV
-5
-6
-6.8
mA
MIN
Clamp Discharge Current
VIN = 500mV
2
3
6.4
µA
MAX
Voltage Gain ( AV)
RL = 150Ω
2.0
1.92
1.90
V/V
MIN
2.08
2.1
V/V
MAX
OUTPUT CHARACTERISTICS
Output Voltage High Swing
VIN = 3V, RL = 150Ω to GND
4.79
4.6
4.55
V
MIN
Output Short-Circuit Current (ISC)
VIN = 0.5V, to GND through 10Ω
120
90
72
mA
MIN
VIN = 1.5V, out short to VDD through 10Ω
-131
-100
-72
mA
MAX
3.0
V
MIN
5.5
V
MAX
POWER SUPPLY
Operating Voltage Range
Power Supply Rejection Ratio (PSRR)
Vs = +3.5 V to + 5.5 V
50
45
42
dB
MIN
Quiescent Current (IQ)
VIN = 500mV, Disable = Vs, no load
Disable = 0V
7
9.5
13
mA
MAX
1
3
6
µA
MAX
Supply Current when Disabled
DYNAMIC PERFORMANCE
±0.1dB Bandwidth
RL = 150Ω, CL = 5pF
5.5
MHz
TYP
-3dB Bandwidth
RL = 150Ω, CL = 5pF
8.0
MHz
TYP
42
dB
TYP
34
V/µs
TYP
Filter Response ( fIN = 27MHz)
Slew Rate
20% to 80%, VIN = 1 V Step,
Differential Gain Error (DG)
PAL DC coupled
0.53
%
TYP
PAL AC coupled
0.27
%
TYP
PAL DC coupled
1.30
°
TYP
PAL AC coupled
1.09
°
TYP
Differential Phase Error (DP)
Group Delay Variation (D/DT)
f = 400KHz, 6.5MHz
30
ns
TYP
Fall Time
2.0VSTEP, 80% to 20%
34
ns
TYP
Rise Time
2.0VSTEP, 80% to 20%
35
ns
TYP
POWER-DOWN DISABLE
Disabled (logic-LOW Threshold)
Vs = 5.0 V
0.4
V
MAX
Disable (logic-HIGH Threshold)
Vs = 5.0 V
1.2
V
MIN
SG Micro Limited
www.sg-micro.com
3
8MHz Rail-to-Rail Composite
Video Driver with 6dB Gain
SGM9110
TYPICAL PERFORMANCE CHARACTERISTICS
At VCC = 5V, TA = +25℃, RL = 150Ω, all outputs AC coupled, unless otherwise noted.
Phase vs. Frequency
270
0
180
Phase (degree)
Normalized Gain (dB)
Frequency Response
3
-3
-6
-9
-12
90
0
-90
-180
-15
-270
0.1
1
10
Frequency (MHz)
100
0.1
0.3
0.5
0.2
0.25
0
-0.25
0.1
0
-0.1
-0.2
-0.5
-0.3
-0.75
-0.3 -0.2 -0.1
0
-0.3 -0.2 -0.1
0.1 0.2 0.3 0.4 0.5 0.6 0.7
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7
Time (µs)
Time (µs)
Group Delay vs. Frequency
Quiescent Current vs. Supply Voltage
8
Quiescent Current (mA)
100
Group Delay (ns)
100
Small Signal Step Response
0.75
Output Voltage (V)
Output Voltage (V)
Large Signal Step Response
1
10
Frequency (MHz)
50
0
-50
-100
7
6
5
4
0.1
1
10
Frequency (MHz)
SG Micro Limited
www.sg-micro.com
100
3
3.5
4
4.5
Supply Voltage (V)
5
5.5
4
8MHz Rail-to-Rail Composite
Video Driver with 6dB Gain
SGM9110
TYPICAL PERFORMANCE CHARACTERISTICS
At VCC = 5V, TA = +25℃, RL = 150Ω, all outputs AC coupled, unless otherwise noted.
Gain Error vs. Temperature
1.2
9
1
8
0.8
Gain Error (%)
Quiescent Current (mA)
Quiescent Current vs. Temperature
10
7
6
5
0.6
0.4
0.2
4
0
-40
-20
0
20
40
60
Temperature (℃)
SG Micro Limited
www.sg-micro.com
80
100 120
-40
-20
0
20
40 60 80
Temperature (℃)
100 120
5
8MHz Rail-to-Rail Composite
Video Driver with 6dB Gain
SGM9110
APPLICATIONS INFORMATION
Internal Sync Clamp
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 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 input can be DC or AC coupling, output can be
DC or AC coupling. For DC input, only one 75Ω resistor is
needed to terminate to GND from input. For AC input, it needs a
typical value of 0.1µF for the input clamp to meet the Line
Droop specification. The SGM9110 output can drive an AC or
DC-coupled doubly terminated coax (150Ω) load (see Figure 1).
DC-coupling the output removes the need for an expensive and
large output coupling capacitor (see Figure 2). If an AC-coupled
output is needed, the SAG correction circuit can be used to
reduce the AC output coupling capacitor value.
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.
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.
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 1µA. 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 = 3.0V to 5.5V
+VS
0.1µF
IN
RIN
CIN
DISABLE
Level
Shifter
3 - Pole
Filter
OUT
6dB
COUT
ROUT
47µF
75Ω
75Ω
RL
CS
SAG
22µF
GND
Figure 1. Typical Application Diagram
SG Micro Limited
www.sg-micro.com
6
8MHz Rail-to-Rail Composite
Video Driver with 6dB Gain
SGM9110
+VS = 3.0V to 5.5V
+VS
0.1µF
IN
RIN
CIN
DISABLE
Level
Shifter
3 - Pole
Filter
OUT
ROUT
75Ω
6dB
75Ω
RL
SAG
GND
Figure 2. AC-Coupled Input/DC-Coupled Output
SAG Correction
Layout and Power-Supply Bypassing
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 150Ω 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 220µF. In SAG configuration,
the SGM9110 removes the need for large coupling capacitors,
and instead needs one 22µF and one 47µF capacitors (Figure 1)
to reach the same performance as the large capacitor.
The SGM9110 operates from single 3.0V to 5.5V supply.
Bypass the supply with a 0.1µF 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.
SG Micro Limited
www.sg-micro.com
•
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.
7
8MHz Rail-to-Rail Composite
Video Driver with 6dB Gain
SGM9110
PACKAGE OUTLINE DIMENSIONS
SC70-6
D
θ
e1
0.20
e
L
E1
E
b
c
L1
A
A1
A2
Symbol
Dimensions
In Millimeters
MIN
MAX
Dimensions
In Inches
MIN
MAX
A
0.900
1.100
0.035
0.043
A1
0.000
0.100
0.000
0.004
A2
0.900
1.000
0.035
0.039
b
0.150
0.350
0.006
0.014
c
0.080
0.150
0.003
0.006
D
2.000
2.200
0.079
0.087
E
1.150
1.350
0.045
0.053
E1
2.150
2.450
0.085
0.096
e
0.65 TYP
0.026 TYP
e1
1.300 BSC
0.051 BSC
L
0.525 REF
0.021 REF
L1
0.260
0.460
0.010
0.018
θ
0°
8°
0°
8°
SG Micro Limited
www.sg-micro.com
8