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TSH343
280MHz single-supply triple video buffer
Features

Bandwidth: 280MHz 5V single-supply operation Internal input DC level shifter No input capacitor required 6dB internal gain for a matching between 3 channels Very low harmonic distortion Slew rate: 780V/s Specified for 150 and 100 loads Min. and max. data tested during production
IN2 2
6dB
Pin1 identification
Top View
IN1 1
6dB
8 OUT1
7 OUT2
Applications

High-end video systems High definition TV (HDTV) Broadcast and graphic video Multimedia products
IN3 3
DC Shifter
6dB
6 OUT3 5 GND
+Vcc 4
SO8
Description
The TSH343 is a triple single-supply video buffer featuring an internal gain of 6dB and a large 280MHz bandwidth. The main advantage of this circuit is that its input DC level shifter allows for video signals on 75 video lines without damage to the synchronization tip of the video signal, while using a single 5V power supply with no input capacitor. The DC level shifter is internally fixed and optimized to keep the output video signals between low and high output rails in the best position for the greatest linearity. This datasheet provides information on using the TSH343 as a Y-Pb-Pr driver for video DAC output on a video line. See the TSH344 datasheet for RG-B signals. The TSH343 is available in the compact SO8 plastic package for optimum space-saving.
March 2007
Rev 4
1/17
www.st.com 17
TSH343
Contents
1 2 3 Absolute maximum ratings and operating conditions . . . . . . . . . . . . . 3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.1 3.2 3.3 Using the TSH343 to drive Y-Pb-Pr video components . . . . . . . . . . . . . . 10 PSRR and improvement of power supply noise rejection . . . . . . . . . . . . 12 Delay between channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4 5 6
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2/17
TSH343
Absolute maximum ratings and operating conditions
1
Absolute maximum ratings and operating conditions
Table 1.
Symbol VCC Vin Toper Tstg Tj Rthjc Rthja Pmax ESD Supply voltage (1) Input voltage range
(2)
Absolute maximum ratings (AMR)
Parameter Value 6 0 to +1.4 -40 to +85 -65 to +150 150 28 157 800 2 1.5 200 Unit V V C C C C/W C/W mW kV kV V
Operating free air temperature range Storage temperature Maximum junction temperature SO8 thermal resistance junction to case SO8 thermal resistance junction to ambient area Maximum power dissipation (@Tamb=25C) for Tj=150C CDM: charged device model HBM: human body model MM: machine model
1. All voltage values, except differential voltage, are with respect to network terminal. 2. The magnitude of input and output voltages must never exceed VCC +0.3V.
Table 2.
Symbol VCC
Operating conditions
Parameter Power supply voltage Value 3 to 5.5(1) Unit V
1. Tested in full production at 0V/5V single power supply.
3/17
Electrical characteristics
TSH343
2
Table 3.
Symbol
Electrical characteristics
VCC = +5V single supply, Tamb = 25C (unless otherwise specified)
Parameter Test conditions Min. Typ. Max. Unit
DC performance Input DC shift (see Figure 16 for the behaviour in temperature) Input bias current Input resistance Input capacitance Supply current per buffer -40C < Tamb < +85C Power supply rejection ratio(1) 20 log (Vout/VCC) DC voltage gain Variation of the DC voltage gain between inputs of 0.3V and 1V Gain matching between 3 channels Gain matching between 3 channels F = 1MHz RL = 150, Vin = 1V Input step from 0.3V to 1V Input = 1V Input = 0.3V 1.92 14.9 -45 1.99 0.26 0.5 0.5 2.05 0.8 2 2 dB V/V % % % RL = 150 Tamb , -40C < Tamb < +85C Tamb , input to GND -40C < Tamb < +85C Tamb Tamb no load, input to GND ICC PSRR G DG MG1 MG0.3 400 600 530 18.2 20.7 4 1 14.4 18 mA 35 A G pF 670 mV
VDC
Iib Rin Cin
Dynamic performance and output characteristics -3dB bandwidth Bw Gain flatness @ 0.1dB FPBW D SR VOH VOL Full power bandwidth Delay between each channel(2) Slew rate (3) High level output voltage Low level output voltage Output current IOUT Output short-circuit current (Isource) Small signal Vout = 20mVp RL = 150 Small signal Vout = 20mVp RL = 150 Vout = 2Vp-p, VICM = 0.5V, RL = 150 0 to 30MHz Input step from 0V to 1V, RL = 150 Vin DC = +1.5V, RL = 150 RL = 150 Vout = 2V, Tamb -40C < Tamb < +85C 45 500 3.7 130 160 280 MHz 65 200 0.5 780 3.9 40 90 mA 82 100 mA MHz ns V/s V mV
4/17
TSH343 Table 3.
Symbol Noise and distortion F = 100kHz, RIN = 50 eN Total input voltage noise 10kHz to 30MHz 10kHz to 100MHz Vout = 2Vp-p, RL = 150 F= 10MHz F= 30MHz Vout = 2Vp-p, RL = 150 F= 10MHz F= 30MHz
Electrical characteristics VCC = +5V single supply, Tamb = 25C (unless otherwise specified) (continued)
Parameter Test conditions Min. Typ. Max. Unit
29 158 290 -58 -45 -72 -50
nV/ Hz Vrms
HD2
2nd harmonic distortion
dBc
HD3
3rd harmonic distortion
dBc
1. See Figure 28 and Figure 29. 2. See Figure 30 and Figure 31. 3. Non-tested value, guaranteed by design.
5/17
Electrical characteristics
TSH343
Figure 1.
10 8 6 4
Frequency response
Figure 2.
6,20 6,15 6,10 6,05
Gain flatness
Gain (dB)
2 0 -2 -4 -6 -8 -10 1M
Gain (dB)
Vcc=5V Load=150
10M 100M 1G
6,00 5,95 5,90 5,85 5,80 5,75 5,70 1M
Vcc=5V Load=150
10M 100M 1G
Frequency (Hz)
Frequency (Hz)
Figure 3.
0 -10 -20 -30
Cross-talk vs. frequency (amp1)
Figure 4.
0
Cross-talk vs. frequency (amp2)
Small Signal Vcc=5V Load=150
-10 -20 -30
Small Signal Vcc=5V Load=150
Gain (dB)
-50 -60 -70 -80 -90 -100 1M
Gain (dB)
-40
-40 -50 -60 -70
2/1 2/3
1/2
1/3
-80 -90 -100 1M
10M
100M
10M
100M
Frequency (Hz)
Frequency (Hz)
Figure 5.
0 -10 -20 -30
Cross-talk vs. frequency (amp3)
Figure 6.
Input noise vs. frequency
Small Signal Vcc=5V Load=150
Vcc=5V input in short-circuit
Input Noise (nV/VHz)
Gain (dB)
-40 -50 -60 -70 -80 -90 -100 1M
100
NA
3/1 3/2
10M
100M
10 10
100
1k
10k
100k
1M
10M
Frequency (Hz)
Frequency (Hz)
6/17
TSH343
Electrical characteristics
Figure 7.
-30 -35 -40 -45
Distortion on 150 load - 10MHz
Figure 8.
-30 -35 -40 -45
Distortion on 100 load - 10MHz
HD2 & HD3 (dBc)
-55 -60 -65 -70 -75 -80 -85 -90 -95 -100 0,0 0,5 1,0 1,5 2,0 2,5 3,0 3,5 4,0 HD3 HD2
HD2 & HD3 (dBc)
-50
Vcc=5V F=10MHz input DC component = 0.65V Load=150
-50 -55 -60 -65 -70 -75 -80 -85 -90 -95 -100 0,0
Vcc=5V F=10MHz input DC component = 0.65V Load=100
HD2
HD3
0,5
1,0
1,5
2,0
2,5
3,0
3,5
4,0
Output Amplitude (Vp-p)
Output Amplitude (Vp-p)
Figure 9.
-10 -15 -20 -25
Distortion on 150 load - 30MHz
Figure 10. Distortion on 100 load - 30MHz
-10 -15 -20 -25
HD2 & HD3 (dBc)
-35 -40 -45 -50 -55 -60 -65 -70 -75 -80 0,0 0,5 1,0 1,5 2,0 2,5 3,0 3,5 4,0 HD3 HD2
HD2 & HD3 (dBc)
-30
Vcc=5V F=30MHz input DC component = 0.65V Load=150
-30 -35 -40 -45 -50 -55 -60 -65 -70 -75 -80 0,0
Vcc=5V F=30MHz input DC component = 0.65V Load=100
HD2
HD3
0,5
1,0
1,5
2,0
2,5
3,0
3,5
4,0
Output Amplitude (Vp-p)
Output Amplitude (Vp-p)
Figure 11. Output DC shift vs. frequency
1,4
Figure 12. Slew rate
3,5
3,0
Output Response (V)
1,2
SR+
2,5
Gain (dB)
2,0
1,0
1,5
SR-
0,8
1,0
Vcc=5V Load=150
0,6 1M 10M 100M
0,5
Vcc=5V Load=150
-5 -4 -3 -2 -1 0 1 2 3 4 5
0,0
Frequency (Hz)
Time (ns)
7/17
Electrical characteristics
TSH343
Figure 13. Reverse isolation vs. frequency
0 -10 -20
Figure 14. Bandwidth vs. temperature
500
Vcc=5V Load=100
450 400
-30
Gain (dB)
-50 -60 -70
Bw (MHz)
-40
350 300 250 200
-80 -90 -100 1M 150 100 -40
Vcc=5V Load=150
-20 0 20 40 60 80
10M
100M
Frequency (Hz)
Temperature (C)
Figure 15. Quiescent current vs. supply
50 45 40 35
Figure 16. Input DC shift vs. temperature
0,8
Vcc=5V Input to ground, no load
0,7
Total Icc (mA)
0,6 30 25 20 15 10 0,3 5 0 0,0 0,2 -40
DCshift (V)
0,5
0,4
Vcc=5V Load=150
-20 0 20 40 60 80
0,5
1,0
1,5
2,0
2,5
3,0
3,5
4,0
4,5
5,0
Vcc (V)
Temperature (C)
Figure 17. Isource vs. output voltage
0 -10 -20 -30
Isource +5V VOH
without load
Figure 18. Voltage gain vs. temperature
2,05 2,04 2,03 2,02
Isource (mA)
-40 -50 -60 -70 -80 -90 -100 -110 -120 0,0 0,5 1,0 1,5 2,0
0V
V
Gain (dB)
2,01 2,00 1,99 1,98 1,97 1,96 1,95 -40
Vcc=5V Load=150
-20 0 20 40 60 80
2,5
3,0
3,5
4,0
4,5
5,0
V (V)
Temperature (C)
8/17
TSH343
Electrical characteristics
Figure 19. Ibias vs. temperature
24
Figure 20. Gain deviation vs. temperature
1,0
22 20
0,8
Gain deviation between 0.3V and 1V input voltages Vcc=5V Load=150
IBIAS (A)
18 16
GD (%)
Vcc=5V Load=150
-20 0 20 40 60 80
0,6
0,4
14 0,2 12
10 -40
0,0 -40
-20
0
20
40
60
80
Temperature (C)
Temperature (C)
Figure 21. Supply current vs. temperature
17
Figure 22. Output current vs. temperature
110
16
100
15
14
Isource (mA)
Vcc=5V no Load
-20 0 20 40 60 80
90
ICC (mA)
80
13
70
12 60
11
Vcc=5V Load=150
-20 0 20 40 60 80
10 -40
50 -40
Temperature (C)
Temperature (C)
Figure 23. Output higher rail vs. temperature
4,2
Figure 24. Gain matching vs. temperature
1,0
4,1 4,0
0,8
Gain matching between 3 channels Vcc=5V Load=150 Vin=0.3V and 1V
3,9 3,8
GM (%)
Vcc=5V Load=150
-20 0 20 40 60 80
VOH (V)
0,6
0,4
3,7 0,2 3,6
3,5 -40
0,0 -40
-20
0
20
40
60
80
Temperature (C)
Temperature (C)
9/17
Application information
TSH343
3
3.1
Application information
Using the TSH343 to drive Y-Pb-Pr video components
Figure 25. Shapes of video signals coming from DACs
White (100 IRE)
1.030V
27ns (2t)
54ns (4t)
27ns (2t)
590ns (44t)
300mV
700mV
Black (30 IRE)
0.330V
300mV
590ns (44t)
14.8s (1100t): 1920*1080i 24.3s (1800t): 1280*720i
GND
10mV
(0 IRE) 0.030V time
Synchronization tip
*Fclock=74.25MHz *t=1/Fclock=13.5ns
Amplitude 1Vp-p
30MHz
Frequency
Figure 26. TSH343 in single supply for any DAC output
video outputs
DAC
+5V
Y,G(+synchro) Pb,B Pr,R
TSH343
SO8
75
Cable
LPF
75
DAC
LPF
75
Cable
DAC
LPF
Cable
HDTV
video outputs
DAC
+5V
R G B
TSH344
SO8
75
Cable
LPF
75
DAC
LPF
75
Cable
DAC
LPF
Digital synchro
Cable
1. See the TSH344 datasheet on st.com for more information. It is possible to drive RGB signals with the TSH344.
10/17
TSH343 Figure 27. Detailed view of one TSH343 channel
+5V
STB
Application information
TV
DAC 140
600mV DC
+
1/3 TSH343 (gain=2)
75
470nH
video line
75 68pF 68pF
-5V
5Volt
0V
5Volt 5Volt
3,22V 1,61V 1,01V 10mV
0Volt 0Volt 0Volt
1,22V
(10mV+600mV)*gain 610mV
Because of the shape of the signal shown in Figure 25, we use a very low output rail triple high-speed buffer. The TSH343 supplied in 5V single power supply, features a low output rail of 40mV on 150-ohm load. The TSH343 is used to drive high definition video signals up to 30MHz on 75-ohm video lines. It is dedicated to driving YPbPr signals where the synchronization tip--close to zero volt--is included in the Y signal. Figure 27 shows a solution used on the STMicroelectronics reference design of STi7100 or STi7200 where the DAC output is loaded by 140 and the bottom of the synchronization tip is set at 10mV. Using the TSH343, an internal input DC value of 600mV is added to the video signal in order to shift the bottom from 10mV to 610mV. The shift is not based on the average of the signal, but is an analog summation of a DC component to the video signal. Therefore, no input capacitors are required which provides a real advantage in terms of cost and board space. The internal gain of 2 obtained makes it possible to remove two resistors on the BOM. To avoid any perturbation on matching from the DACs output impedance along a large band of 30MHz in HD, a discrete reconstruction filtering is implemented after the driver. This filter is matched on 75-ohms. Note that the TSH343 cannot be AC output coupled (it cannot sink an output current, therefore it is not possible to implement an output series capacitor).
11/17
Application information
TSH343
3.2
PSRR and improvement of power supply noise rejection
Figure 28. Circuit for power supply bypassing
S R +5V T-bias L CLF CHF AGILENT 4395A
50 TSH343 75
A
Figure 29 shows how the power supply noise rejection evolves versus frequency depending on how carefully the power supply decoupling is achieved. Figure 29. Power supply noise rejection
0 -10 -20 -30 -40 -50 -60 -70 -80 100k L=2uH CHF=100nF CLF=10uF L= Ferrite FBMJ4516HM900 CHF=100nF CLF=10uF
PSRR
PSRR (dB)
1M
10M
100M
Frequency (Hz)
Criteria for choosing the ferrite:

In DC, the resistance (R) of the ferrite must be as low as possible to keep +5V power supply on the chip. In AC, along a 30MHz bandwidth (HD spectrum), the equivalent impedance (Z=R+jX) must be as high as possible to optimize rejection of the noise generated by the power supply.
12/17
TSH343
Application information
3.3
Delay between channels
Figure 30. Measurement of the delay between each channel
5V
600mV
75 +6dB
75 Cable
+
V1 75
Vin 75
600mV
75 +6dB
+
75 Cable
V2 75 75
600mV
+
+6dB
75 Cable
V3 75
The delay between each video component is an important aspect in high definition video systems. To properly drive the three video components without any relative delay, the TSH343 dice layout has a very symmetrical geometry. The effect is direct on the synchronization of each channel, as shown in Figure 31. There is no delay between channels when the same Vin signal is applied on the three inputs. Note that the delay between the inputs and the outputs is 4ns. Figure 31. Relative delay between each channel
3 Output responses (V1, V2, V3) Input (Vin)
-4ns -2ns
Vcc=5V Load=150
0s
2ns
4ns
6ns
8ns 10ns 12ns 14ns 16ns 18ns 20ns
Time
13/17
Package mechanical data
TSH343
4
Package mechanical data
In order to meet environmental requirements, STMicroelectronics offers these devices in ECOPACK(R) packages. These packages have a lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an STMicroelectronics trademark. ECOPACK specifications are available at: www.st.com.
14/17
TSH343 Figure 32. SO-8 package
Dimensions Ref. Min. Millimeters Typ. Max. Min.
Package mechanical data
Inches Typ. Max.
A A1 A2 b c D E E1 e h L k ccc 0.25 0.40 1 0.10 1.25 0.28 0.17 4.80 5.80 3.80 4.90 6.00 3.90 1.27
1.75 0.25 0.004 0.049 0.48 0.23 5.00 6.20 4.00 0.011 0.007 0.189 0.228 0.150 0.193 0.236 0.154 0.050 0.50 1.27 8 0.10 0.010 0.016 1
0.069 0.010
0.019 0.010 0.197 0.244 0.157
0.020 0.050 8 0.004
15/17
Ordering information
TSH343
5
Ordering information
Table 4. Order codes
Temperature range Package Packing Marking
Part number
TSH343ID TSH343IDT
-40C to +85C
SO-8
Tube Tape & reel
TSH343I TSH343I
6
Revision history
Table 5.
Date
Document revision history
Revision Changes
1-Dec-2005 2-Jan-2006 10-Jul-2006 7-Mar-2007
1 2 3 4
First release of datasheet. Capa-load option paragraph deleted on page 11. Application information. Max limit for input DC shift reduced from 800mV to 670mV. Updated Section 3.2: PSRR and improvement of power supply noise rejection on page 12.
16/17
TSH343
Revision history
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