TPF131
36M HD Composite Video Filter Driver
Features
1-HDTV Video Filter Support Composite 1080i/720p
Optimized
6th
-order Butterworth Video reconstruction
filter：
HD Channel: -3dB
≥
36MHz
Support Multiple Input Biasing:
- Provide 80-mV Level-Shift when DC-Coupled
- Transparent Input Clamping when AC-Coupled
- Support External DC Biasing when AC-Coupled
Very Low Quiescent Current: 6 mA(at 3.3V, Typical)
6dB Gain(2V/V), Rail TO Rail Output
AC- or DC-Coupled Output Driving Dual Video Loads
(75Ω)
Wide Power Supply: +3.0V to +5.5V Single Supply
Robust ESD Protection:
-
Robust 8kV – HBM and 2kV – CDM ESD Rating
Green Product, SOT23-6 Package
Description
TPF131 is a specially designed for consumer applications,
high-performance, low-cost video reconstruction filter, it
combine excellent video performance and low power
consumption perfectly. It incorporates one high-definition (HD)
filter channels. The filter feature sixth-order Butterworth
characteristics that are useful as digital-to-analog converter
(DAC) reconstruction filters or as analog-to-digital converter
(ADC) anti-aliasing filters. The HD filters can be bypassed to
support HDCVI 1080i/720p video.
As part of the TP131 flexibility, the input can be configured for
ac- or dc-coupled inputs. The 84-mV output level shift allows
for a full sync dynamic range at the output with 0-V input. The
ac-coupled modes include a transparent sync-tip clamp
option for composite video (CVBS), Y', and G'B'R' signals.
AC- coupled biasing for C'/P'B/P'R channels can easily be
achieved by adding an external resistor to VS+.
The TP131 rail-to-rail output stage with 6-dB gain allows for
both ac and dc line driving. The ability to drive two lines, or
75-Ω loads, allows for maximum flexibility as a video line
driver. The 6-mA total quiescent current at 3.3 V makes it an
excellent choice for power-sensitive video applications.
TPF131 is available in SOT23-6 package (TPF131-TR). Its
operation temperature range is from
−40°C
to +85°C.
Applications
Video Signal Amplification
Set-Top Box Video Driver
PVR、DVD Player Video Buffer
Video Buffer for Portable or USB-Powered Video
Devices
HDTV
Related Resources
AN-1201: Application notes of TPF1xx
Pin configuration
(Top View)
NC
HD OUT
NC
1
2
3
6
+Vs
GND
HD IN
TPF131
6-Pin SOT23
(-T Suffix)
5
4
Pin Name
HD IN
+V
S
GND
HD OUT
NC
Pin Function
HD video input, LPF = 36 MHz
Positive Power Supply
Ground
HD video output, LPF = 36 MHz
No Connection
Figure 1.
Rev. A
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©2014 3PEAK INCORPORATED
TPF131
36M HD Composite Video Filter Driver
Function Block
Figure 2.
Order Information
Operating
Order Number
Temperature
Range
Package
Package
Options
Transport Media, Quantity
TPF131-TR
-40 to 85°C
6-Pin SOT23-6
MSL-3
Tape and Reel, 3000
Absolute Maximum Ratings*
Parameters
Power Supply, V
DD
to GND
Input Voltage
Output Current
Maximum Junction Temperature
Operating Temperature Range
Storage Temperature Range
Lead Temperature (Soldering 10 sec)
Units
6.0
V
V
DD
+ 0.3V to GND - 0.3V
65
mA
150
°C
–45 to 85
°C
–65 to 150
°C
300
°C
Value
V
IN
I
O
T
J
T
A
T
STG
TL
* Note:
Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device.
Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime.
(1) This data was taken with the JEDEC low effective thermal conductivity test board.
(2) This data was taken with the JEDEC standard multilayer test boards.
ESD, Electrostatic Discharge Protection
Symbol
HBM
CDM
Parameter
Human Body Model ESD
Condition
MIL-STD-883H Method 3015.8
Minimum
Level
8
2
Unit
kV
kV
Rev. A
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Charged Device Model ESD JEDEC-EIA/JESD22-C101E
©2014 3PEAK INCORPORATED
~ 2 ~
TPF131
36M HD Composite Video Filter Driver
Electrical Characteristics
All test condition is VDD = 3.3V, TA = +25°C, RL = 150Ω to GND,
unless otherwise noted.
SYMBOL
V
DD
I
DD
I
CLAMP-DOWN
I
CLAMP-UP
V
CLAMP
R
IN
AV
V
OLS
V
OL
V
OH
PSRR
I
SC
PARAMETER
Supply Voltage Range
Quiescent current
(I
Q
)
(1)
CONDITIONS
MIN
3.0
TYP
MAX
5.5
UNITS
V
mA
mA
μA
mA
mV
MΩ
Input Electrical Specifications
V
DD
= 3.3V, V
IN
= 500mV, no load
V
DD
= 5.0V, V
IN
= 500mV, no load
V
IN
=300mV, measure current
V
Y
= -0.2V
I
Y
= -100μA
0.5V < V
Y
< 1V
V
IN
=0.5V,1V or 2V
R
L
=150Ω to GND
V
IN
= 0V, no load, input referred
V
IN
= -0.3V, R
L
=75Ω
V
IN
= 3V, R
L
=75Ω to GND (dual
load)
ΔV
DD
= 3.3V to 3.6V
ΔV
DD
= 5.0V to 5.5V, 50Hz
V
IN
= 2V, 10Ω, output to GND
V
IN
=0.1V, output short to V
DD
65
65
0.6
-1.5
-40
0.5
5.91
54
6
8.3
2.0
-1.7
0
3
6.01
80
0.05
3.18
61
67
8
9.8
4.8
+40
Clamp Discharge Current
Clamp Charge Current
Input Voltage Clamp
Input Impedance
Voltage Gain
Output Level Shift Voltage
Output Voltage Low Swing
Output Voltage High Swing
Power Supply Rejection Ratio
Short-circuit current
6.03
124
dB
mV
V
V
dB
dB
mA
mA
AC Electrical Specifications
f
-1dB
f
-3dB
dG
dP
THD
D/DT
X
TALK
SNR
R
OUT_AC
-1dB
Bandwidth
-3dB
Bandwidth
Differential Gain
HD Channel
HD Channel
R
L
=150Ω
R
L
=150Ω
Video input range 1V
Video input range 1V
f=1MHz, V
OUT
=1.4V
PP
f = 100kHz to 60MHz
f = 1MHz, V
OUT
=1.4V
PP
27.3
31.9
-0.1
-1.1
31.0
35.5
0.4
0.7
0.02
5.0
34.7
39.3
0.8
1.1
MHz
MHz
%
°
%
ns
dB
dB
Ω
Differential Phase
Total
Harmonic
HD Channel
Distortion
Group Delay
Variation
Channel Crosstalk
Signal-to-Noise
Ration
HD Channel
HD Channel
-68
66
-74
71
0.5
f= 100kHz to 30MHz
f = 10MHz
Output Impedance
Note: (1). 100% tested at T
A
=25°C.
Rev. A
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~3~
©2014 3PEAK INCORPORATED
TPF131
36M HD Composite Video Filter Driver
Application Information
The TPF131 is targeted for systems that require 1
channel high-definition (HD) video outputs. Although it
can be used for numerous other applications, the needs
and requirements of the video signal are the most
important design parameters of the TPF131. The
TPF131 incorporates many features not typically found in
integrated video parts while consuming very low power.
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 TPF131 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 simplified block diagram of the TPF131 in
Figure-2. 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.
capacitance is 0.1μF, the maximum droop voltage is
about 1mV which is restored by the clamp circuit. The
maximum pull-up current of the clamp circuit is 1.7mA.
For a 4μs sync tip width and 0.1μF capacitor, the
maximum restoration voltage is about 80mV.
The line droop voltage will increase if a smaller
AC-coupling capacitance is used. For the same
reason, if larger capacitance is used the line droop
voltage will decrease. Table 1 is droop voltage and
maximum restoration voltage of the clamp for typical
capacitance.
Table 1.
Maximum restoration voltage and droop voltage
of Y signals for different capacitance
DROOP IN 60μs
(mV)
1.2
0.12
CHARGE IN 4μs
(mV)
68
6.8
CAP VALUE
(nF)
100
1,000
Low Pass Filter--Sallen Key
The Sallen Key is a classic low pass configuration.
This provides a very stable low pass function, and in
the case of the TPF131, the six-pole roll-off at around
36MHz. The six-pole function is accomplished with an
RC low pass network placed in series with and before
the Sallen Key.
Output Couple
TPF131 output could support both “AC Couple” and
“DC Couple”, if use “AC Couple”, this capacitor is
typically between 220-μF and 1000-μF, although
470-μF is common. This value of this capacitor must
be this large to minimize the line tilt (droop) and/or
field tilt associated with ac-coupling as described
previously in this document.
The TPF131 internal sync clamp makes it possible to
DC couple the output to a video load, eliminating the
need for any AC coupling capacitors, thereby saving
board space and additional expense for capacitors.
This makes the TPF131 extremely attractive for
portable video applications. Additionally, this solution
completely eliminates the issue of field tilt in the lower
frequency. The trade off is greater demand of supply
current. Typical load current for AC coupled is around
1mA, compared to typical 6.6mA used when DC
coupling.
Rev. A
~ 4 ~
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Droop Voltage and DC
Restoration
Selection of the input AC-coupling capacitance is
based on the system requirements. A typical sync tip
width of a 64μs NTSC line is 4μs during which clamp
circuit restores its DC level. In the remaining 60μs
period, the voltage droops because of a small
constant 2.0μA sinking current. If the AC-coupling
©2014 3PEAK INCORPORATED
TPF131
36M HD Composite Video Filter Driver
Output Drive Capability and
Power Dissipation
With the high output drive capability of the TPF131, it
is possible to exceed the +125°C absolute maximum
junction temperature under certain load current
conditions. Therefore, it is important to calculate the
maximum junction temperature for an application to
determine if load conditions or package types need to
be modified to assure operation of the amplifier in a
safe operating area. The maximum power dissipation
allowed in a package is determined according to
Equation:
PD
MAX
=
T
JMAX
T
AMAX
PD
MAX
=
V
s
I
SMAX
+
（
V
s
V
OUT
）
V
OUT
R
L
Where：
V
S
= Supply voltage
I
SMAX
= Maximum quiescent supply current
V
OUT
= Maximum output voltage of the application
R
LOAD
= Load resistance tied to ground
By setting the two PDMAX equations equal to each
other, we can solve the output current and RLOAD to
avoid the device overheat.
Power Supply Bypassing Printed
Circuit Board Layout
As with any modern operational amplifier, a good
printed circuit board layout is necessary for optimum
performance. Lead lengths should be as short as
possible. The power supply pin must be well bypassed
to reduce the risk of oscillation. For normal single
supply operation, a single 4.7μF tantalum capacitor in
parallel with a 0.1μF ceramic capacitor from VS+ to
GND will suffice.
JA
Where：
T
JMAX
= Maximum junction temperature
T
AMAX
= Maximum ambient temperature
Θ
JA
= Thermal resistance of the package
The maximum power dissipation actually produced by
an IC is the total quiescent supply current times the
total power supply voltage, plus the power in the IC
due to the load, or: for sourcing:
VIDEO FILTER DRIVER SELECTION GUIDE
P/N
TPF110
/TPF110L
TPF113
TPF114
TPF116
Product Description
Low power, enable function and
SAG correction, 1 channel 6 order
9MHz
Low power 3 channel, 6th-order
9MHz SD video filter
Low power 4 channel, 6th-order
9MHz SD video filter
Low power 4 channel, 6th-order
9MHz SD video filter for CVBS,
SVIDEO
th
Channel
1-SD
-3dB Bandwidth
9MHz
Package
SC70-5
SOT23-6
SO-8
MSOP-10
TSSOP-14
TSSOP-14
3-SD
4-SD
6-SD
9MHz
9MHz
9MHz
TPF123
3 channel 6th-order 13.5MHz,
960H/720H-CVBS video filter or
Y’Pb’Pr 480P/576P video filter
3-ED
13.5MHz
SO-8
TPF133
TPF134
Low power 3 channel, 6th-order
36MHz HD video filter
Low power 3 channel, 6th-order
36MHz HD video filter and 1 channel
SD video filter
3-HD
1-SD&
3-SD
3-SD&
36MHz
9MHz
36MHz
9MHz
SO-8
MSOP-10
TSSOP-14
TSSOP-20
TPF136
Low power 3 channel, 6th-order
Rev. A
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©2014 3PEAK INCORPORATED
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