TSH344
340MHz single-supply triple video buffer
Features
Bandwidth: 340MHz 5V single-supply operation Low output rail guaranteed at 60mV max Internal gain of 6dB for a matching between 3 channels Very low harmonic distortion Slew rate: 740V/ms Specified for 150 and 100 loads Tested on 5V power supply Min. and max. data tested during production
IN1 1
6dB
Pin connections (top view)
Pin1 identification
Top View
8 OUT1
Applications
IN2 2
6dB
7 OUT2
High-end video systems High definition TV (HDTV) Broadcast and graphic video Multimedia products
+Vcc 4 5 GND IN3 3
6dB
6 OUT3
Description
The TSH344 is a triple single-supply video buffer featuring an internal gain of 6dB and a large bandwidth of 340MHz. The main advantage of this buffer is its very low output rail very close to GND when supplied in single supply 0/5V. This output rail is guaranteed by test at 60mV from GND on 150. This datasheet gives technical information on using the TSH344 as an RGB driver for video DAC output on a video line. See the TSH343 datasheet for Y-Pb-Pr signals. The TSH344 is available in the compact SO8 plastic package for optimum space-saving.
SO8
March 2007
Rev 4
1/17
www.st.com 17
Contents
TSH344
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 TSH344 to drive R-G-B video components . . . . . . . . . . . . . . . 10 Power supply considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Delay between channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4 5 6
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2/17
TSH344
Absolute maximum ratings and operating conditions
1
Absolute maximum ratings and operating conditions
Table 1.
Symbol
Absolute maximum ratings (AMR)
Parameter Value Unit
VCC Vin Toper Tstg Tj Rthjc Rthja Pmax ESD
Supply voltage (1) Input voltage range
(2)
6 0 to +2 -40 to +85 -65 to +150 150 28 157 800 2 1.5 200
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 voltage must never exceed VCC +0.3V.
Table 2.
Symbol
Operating conditions
Parameter Value Unit
VCC
Power supply voltage (1)
3 to 5.5
V
1. Tested in full production at 0V/5V single power supply.
3/17
Electrical characteristics
TSH344
2
Table 3.
Symbol
Electrical characteristics
VCC = +5V single supply, Tamb = 25C (unless otherwise specified)
Parameter Test conditions Min. Typ. Max. Unit
DC performance
VOS
Output offset voltage(1)
No load, Tamb -40C < Tamb < +85C
-35
-8 -8.6 5.5 6 4 1 -90 10.1 10.3
+35 mV 16
Ii b Rin Cin PSRR
Input bias current Input resistance Input capacitance Power supply rejection ratio 20 log (VCC/Vout)(2) Supply current per buffer
Tamb, input to GND -40C < Tamb < +85C Tamb Tamb Input to GND, F=1MHz, VCC=200mV No load, input to GND
A
G pF dB 13 mA
ICC G MG1 MG0.3
-40C < Tamb < +85C DC voltage gain RL = 150, Vin=1V 1.92
2 0.5 0.5
2.05 2 2
V/V % %
Gain matching between 3 channels Input = 1V Gain matching between 3 channels Input = 0.3V
Dynamic performance and output characteristics
-3dB bandwidth Bw Gain flatness @ 0.1dB FPBW D SR VOH VOL Full power bandwidth Delay between each channel Slew rate (3) High level output voltage Low level output voltage Output current IO U T Output short circuit current (Isource)
Small signal Vout=20mVp Vicm=0.6V, RL = 150 Small signal Vout=20mVp Vicm=0.6V, RL = 150 Vicm=0.6V, Vout = 2Vp-p, RL = 150 0 to 30MHz Vicm=0.6V, Vout = 2Vp-p, RL = 150 RL = 150 RL = 150 Vout= 2Vp, Tamb -40C < Tamb < +85C
190
340 MHz 65
130
200 0.5
MHz ns V/s V 60 mV mA
500 3.7
740 3.9 40
45
93 83 100 mA
4/17
TSH344 Table 3.
Symbol Noise and distortion
Electrical characteristics VCC = +5V single supply, Tamb = 25C (unless otherwise specified)
Parameter Test conditions Min. Typ. Max. Unit
F = 100kHz, Rin = 50 eN Total input voltage noise Rin = 50 Bw=30MHz Bw=100MHz Vout = 2Vp-p, RL = 150 F= 10MHz F= 30MHz Vout = 2Vp-p, RL = 150 F= 10MHz F= 30MHz
8 55 100 -57 -42 -72 -51
nV/ z H
Vrms
HD2
2nd harmonic distortion
dBc
HD3
3rd harmonic distortion
dBc
1. Output offset voltage is determined by the following expression: VOUT =G.VIN+VOS. 2. See Figure 28 and Figure 29. 3. Non-tested value, guaranteed by design and evaluation. See Figure 12.
5/17
Electrical characteristics
TSH344
Figure 1.
10 8 6 4
Frequency response
Figure 2.
6 ,2 6 ,1 6 ,0 5 ,9
Gain flatness
Gain (dB)
2 0 -2 -4 -6 -8 -1 0 1M
Gain (dB)
5 ,8 5 ,7 5 ,6 5 ,5 5 ,4
Vcc=5V Load =150
10 M 100 M 1G
5 ,3 5 ,2 1M
V c c= 5 V L oa d=1 50
1 0M 10 0 M 1G
Frequency (Hz)
Frequency (Hz)
Figure 3.
0 -1 0 -2 0 -3 0
Cross-talk vs. frequency (amp1)
Figure 4.
0
Cross-talk vs. frequency (amp2)
Sm all Signal V c c=5 V L oa d=15 0
-2 0
Sm all Signal V c c=5 V L oa d=15 0
Gain (dB)
-5 0 -6 0 -7 0 -8 0 -9 0 - 10 0 1M
1 /2
Gain (dB)
-4 0
-4 0
-6 0
2 /1
1 /3
-8 0
2 /3
- 10 0 1M
1 0M
1 00 M
1 0M
1 00 M
Frequency (Hz)
Frequency (Hz)
Figure 5.
0
Cross-talk vs. frequency (amp3)
Figure 6.
Input noise vs. frequency
Vcc=5V DC input = 1.5V (Battery)
-2 0
Input Noise (nV/VHz)
3 /2
1 00M
Sm all Signal V cc= 5V Lo a d= 15 0
100
Gain (dB)
-4 0
-6 0
3 /1
-8 0
10
-10 0 1M
10M
Frequency (Hz)
10
100
1k
10k
100k
1M
10M
Frequency (Hz)
6/17
TSH344
Electrical characteristics
Figure 7.
-30 -35 -40 -45 -50 -55 -60 -65 -70 -75 -80 -85 -90 -95 -100 0,0 0,5
Distortion on 150 load - 10MHz
Figure 8.
-30 -35 -40 -45 -50 -55 -60 -65 -70 -75 -80 -85
Distortion on 100 load - 10MHz
V c c=5 V F=1 0MH z inp ut DC component = 1.15V L oad =15 0
V cc = 5 V F=10 MH z inpu t DC component = 1.15V Lo ad=100
HD2 & HD3 (dBc)
HD2
HD2 & HD3 (dBc)
HD 2
H D3
HD 3
-90 -95 -100 0,0
1,0
1,5
2,0
2,5
3,0
3,5
4,0
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 - 30 - 35 - 40 - 45 - 50 - 55 - 60 - 65 - 70 - 75 - 80 0 ,0 0, 5 H D2
Distortion on 150 load - 30MHz
Figure 10. Distortion on 100 load - 30MHz
- 10 - 15 - 20 - 25 - 30 - 35 - 40 - 45 - 50 - 55 - 60 - 65 - 70 - 75 - 80 0 ,0 H D3 HD 2
HD2 & HD3 (dBc)
H D3
1, 0
1 ,5
2 ,0
2, 5
3, 0
3 ,5
4 ,0
HD2 & HD3 (dBc)
Vcc=5V F=3 0MH z in p u t DC component = 1.15V Load=150
Vcc=5V F=3 0MH z in p u t DC component = 1.15V Load=100
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 current
0 -10 -20 -30
Isource +5V VOH
without load
Figure 12. Slew rate
4 ,0 3 ,5 3 ,0 2 ,5 2 ,0 1 ,5 1 ,0 0 ,5
Isource (mA)
-40 -50 -60 -70 -80 -90 -10 0 -11 0 -12 0 0,0
0V
V
Output Response (V)
SR+
SR-
V cc=5 V Loa d=1 50
-2 -1 0 1 2 3 4 5 6 7 8
0 ,0 0,5 1,0 1,5 2 ,0 2 ,5 3 ,0 3 ,5 4 ,0 4,5 5,0
V (V)
Tim e (ns)
7/17
Electrical characteristics
TSH344
Figure 13. Reverse isolation vs. frequency
0 -1 0 -2 0
Figure 14. Output swing vs. frequency
5
V c c=5 V L oa d=15 0
4
Gain (dB)
-4 0 -5 0 -6 0 -7 0 -8 0 -9 0 - 10 0 1M
Vout max. (Vp-p)
-3 0
3
2
1
V c c=5 V Load=100 or Load=150
1 0M 1 00 M 0 1M 10M 1 00 M
Frequency (Hz)
Frequency (Hz)
Figure 15. Quiescent current vs. supply
30
Figure 16. Output swing vs. supply
5
25
V c c=5 V n o load
4
Total Icc (mA)
20
Vout peak-peak (Vp-p)
3
15
2
10
1
5
V c c= 5 V F=30M H z L o a d = 1 0 0 or 150
3, 2 5 3 ,5 0 3 ,7 5 4 , 00 4, 2 5 4 ,5 0 4 ,7 5 5 ,0 0
0 0 ,0
0 ,5
1,0
1 ,5
2,0
2,5
3 ,0
3,5
4,0
4 ,5
5,0
0 3 , 00
Vcc (V)
Vcc (V)
Figure 17. Bandwidth vs. temperature
50 0 45 0 40 0
Figure 18. Voltage gain vs. temperature
2 ,0 5 2 ,0 4 2 ,0 3 2 ,0 2
Bw (MHz)
Gain (dB)
V cc=5 V Loa d=1 50
- 20 0 20 40 60 80
35 0 30 0 25 0 20 0
2 ,0 1 2 ,0 0 1 ,9 9 1 ,9 8 1 ,9 7
15 0 10 0 - 40
1 ,9 6 1 ,9 5 -4 0
V cc = 5 V Lo ad= 150
- 20 0 20 40 60 80
Tem perature (C)
Tem perature (C)
8/17
TSH344
Electrical characteristics
Figure 19. Ibias vs. temperature
2
Figure 20. Gain matching vs. temperature
1 ,0
Vcc= 5V Load=150
3 0 ,8
Gain Matching between 3 channels V cc = 5 V Lo ad =15 0 Vin=0.3V and 1V
IBIAS (A)
5
GM (%)
-2 0 0 20 40 60 80
4
0 ,6
0 ,4
6
0 ,2
7 -40
0 ,0 -40
-2 0
0
20
40
60
80
Tem peratur e (C)
Tem perature (C)
Figure 21. Supply current vs. temperature
12
Figure 22. Output current vs. temperature
11 0
11
10 0
ICC (mA)
10
Isource (mA)
Vcc= 5V n o Load
90
80
9
70
8
60
Vcc=5V Load =150
-20 0 20 40 60 80
7 -40
-2 0
0
20
40
60
80
50 -4 0
Tem peratur e (C)
Tem perature (C)
Figure 23. Output higher rail vs. temperature
4,2
Figure 24. Output lower rail vs. temperature
50
4,1
45
4,0
40
VOH (V)
3,9 3,8
VOL (V)
Vcc=5V Load=1 50
- 20 0 20 40 60 80
35
30
3,7
25
3,6
Vcc=5V Load=1 50
20 -4 0 - 20 0 20 40 60 80
3,5 -4 0
Temperature (C)
Temperature (C)
9/17
Application information
TSH344
3
3.1
Application information
Using the TSH344 to drive R-G-B 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. TSH344 in single supply for HD
video outputs
DAC
+5V
R G B
TSH344
SO8
75
LPF LPF LPF
Cable
DAC
75
Cable
DAC
75
Cable
Digital synchro
HDTV
video outputs
DAC
+5V
Y,G(+synchro) Pb,B Pr,R
TSH343
SO8
75
LPF LPF LPF
Cable
DAC
75
Cable
DAC
75
Cable
Note:
See the TSH343 datasheet on st.com for more information (the TSH343 is used to drive a video signal including a synchronization tip).
10/17
TSH344 Figure 27. Details on one channel of the TSH344
+5V
+ 100F 10nF
Application information
STB
TV
DAC External resistor. Load required by the DAC output specification
1/3 TSH344 (gain=2)
75
470nH
video line
75 68pF 68pF
0V
5Volt 5Volt
2V 1V 300mV
0Volt
1V 600mV
0Volt Low output Rail : 60mV max. tested (see datasheet p.3: Vol)
300mV
0Volt
Because of the shape of the signal described in Figure 25, we use a very low output rail triple high-speed buffer. The TSH344 supplied in 5V single power supply features a low output rail of 60mV (guaranteed by test) on 150 load. It is dedicated for driving RGB signals without synchronisation (in the case where the synchronization is provided digitally on the digital bus). The gain of the TSH344 (gain=2) is internal which 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 Note that the TSH344 uses a single supply architecture . and it is not AC output coupled (it cannot sink an output current, therefore it is not possible to implement an output series capacitor).
11/17
Application information
TSH344
3.2
Power supply considerations
Correct power supply bypassing is very important for optimizing performance in low and high-frequency ranges. Bypass capacitors should be placed as close as possible to the IC pin (pin 4) to improve high-frequency bypassing. A capacitor (CLF) greater than 100F is necessary to improve the PSRR in low frequencies. For better quality bypassing, a capacitor of 470nF (CHF) is also added as close as possible to the IC pin to improve the PSRR in the higher frequencies. Figure 28. Circuit for power supply bypassing
+VCC CLF + CHF 4
R G B
TSH344
5
Figure 29 shows how the power supply noise rejection evolves versus frequency depending on how carefully the power supply decoupling is achieved. Figure 29. Improvement of power supply noise rejection
0 -10 -20 -30 -40 -50 -60 -70 -80 10k
Vcc=5V Load =150 PSR R=20 log (VCC/Vout) without c a p a c i to r
PSRR (dB)
CLF=100uF C HF = 4 7 0 n F
100k
1M
10M
100M
Frequency (Hz)
12/17
TSH344
Application information
3.3
Delay between channels
Figure 30. Measurement of the delay between each channel
5V
+6dB
75
75 Cable
V1 75
Vin 75
+6dB
75
75 Cable
V2 75
+6dB
75
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 layout of the TSH344 dice has a very symmetrical geometry. this has a direct effect on the synchronization of each channel, as shown in Figure 31. There is no delay detected between channels when the same Vin signal is applied on the three inputs. Note that the delay between the inputs and the outputs is equal to 4ns. Figure 31. Relative delay between each channel
3 Output responses
Vcc=5V Load=150
Inpu t
- 4 n s - 2n s
0s
2ns
4 ns
6ns
8n s 1 0n s 1 2 n s 1 4 n s 1 6 n s 1 8n s 20 n s
T im e
13/17
Package information
TSH344
4
Package information
In order to meet environmental requirements, STMicroelectronics offers these devices in ECOPACK 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
TSH344 Figure 32. SO-8 package mechanical data
Dimensions Ref. Min. Millimeters Typ. Max. Min.
Package information
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
TSH344
5
Ordering information
Table 4. Order codes
Temperature range Package Packing Marking
Part number
TSH344ID -40C to +85C TSH344IDT SO-8
Tube Tape & reel
TSH344I TSH344I
6
Revision history
Date Revision Changes
Dec-2005 Jan-2006 Jul-2006 14-Mar-2007
1 2 3 4
First release of datasheet. Capa-load option paragraph deleted on page 11. Application information. Updated Section 3.2: Power supply considerations on page 12.
16/17
TSH344
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