TSH345
Triple video buffer with selectable filter for HD and SD video applications
Features
Selectable 6th order filtering of 36 MHz, 18 MHz and 9 MHz 5 V single-supply operation Internal input DC level shifter No input capacitor required 3 matched 6 dB amplifiers AC or DC output-coupled Very low harmonic distortion Specified for 150 loads Data min. and max. are tested during production
R2 in 2 G1 in 3
MUX
SO-14
TSSOP14
R1 in 1
MUX
36MHz 18MHz 9MHz LPF
14 Fs0
+
6dB
13 Fs1 12 R out
Applications
G2 in 4
36MHz 18MHz 9MHz LPF
+
6dB
11 G out 10 B out
High-end video systems
MUX
High definition TV (HDTV) Broadcast and graphic video Multimedia products
B1 in 5 B2 in 6 +VCC 7
36MHz 18MHz 9MHz LPF
+
6dB
9 Mux
DC Shifter
8 GND
Description
The TSH345 is a triple single-supply video buffer featuring an internal gain of 6 dB and selectable filtering for HD and SD video outputs on 75 video lines. The TSH345 is ideal to drive YC, CVBS, YUV, YPbPr or RGB signals from video DAC outputs. The main advantage of this circuit is its input DC level shifter. It allows driving video signals on 75 video lines without damaging the synchronization tip and without input or output capacitors when using a single 5 V power supply. 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. The TSH345 is available in SO-14 and TSSOP-14 plastic packages for optimum space saving.
December 2008
Rev 1
1/23
www.st.com 23
Absolute maximum ratings and operating conditions
TSH345
1
Table 1.
Symbol VCC Vin Toper Tstg Tj Rthjc
Absolute maximum ratings and operating conditions
Absolute maximum ratings
Parameter Supply voltage (1) Input voltage range Operating free air temperature range Storage temperature Maximum junction temperature Thermal resistance junction to case SO-14 TSSOP14 Thermal resistance junction to ambient area SO-14 TSSOP14 Maximum power dissipation (at Tamb = 25 C) for Tj = 150 C SO-14 TSSOP14 CDM: charged device model HBM: human body model MM: machine model Value 6 2.5 -40 to +85 -65 to +150 150 22 32 125 110 1 1.1 250 2 100 Unit V V C C C C/W
Rthja
C/W
Pmax
W V kV V
ESD
1. All voltage values, except differential voltage, are with respect to network terminal.
Table 2.
Symbol VCC
Operating conditions
Parameter Power supply voltage Value 4.5 to 5.5(1) Unit V
1. Tested in full production with +5 V single power supply.
2/23
TSH345
Electrical characteristics
2
Electrical characteristics
Table 3.
Symbol DC performance VDC Output DC shift , RL = 150 Tamb -40 C < Tamb < +85 C Input bias current Tamb , input to GND -40 C < Tamb < +85 C Input resistance, Tamb Input capacitance, Tamb Total supply current (3 x operators) No load, input to GND -40C < Tamb < +85C DC voltage gain RL = 150, Vin = 1.4V -40C < Tamb < +85C 1.96 100 240 310 1.3 1.4 1 0.1 44.6 45 2 1.96 51.6 440 mV
Electrical characteristics at VCC = +5 V single supply, Tamb = 25C (unless otherwise specified)
Test conditions Min. Typ. Max. Unit
Iib Rin Cin ICC
3.6
A M pF mA
G
2.05
V/V
Output characteristics VOH High level output voltage RL = 150 -40 C < Tamb < +85 C Low level output voltage RL = 150 Isource Tamb -40 C < Tamb < +85 C Isink -40 C < Tamb < +85 C Filtering Bandwidth F1 selected, small signal, VICM= 0.5 V, RL = 150 -3 dB bandwidth -1 dB bandwidth Attenuation F1 selected/F=27 MHz, small signal, VICM = 0.5 V, RL = 150 76 3.4 3.9 3.8 47 V
VOL
mV
Iout
100 91 134 126
mA
106
mA
Standard definition
5 40
9 5.7 45
MHz
dB
3/23
Electrical characteristics Table 3.
Symbol
TSH345
Electrical characteristics at VCC = +5 V single supply, Tamb = 25C (unless otherwise specified) (continued)
Test conditions Bandwidth F2 selected, small signal, VICM = 0.5 V, RL = 150 -3 dB bandwidth -1 dB bandwidth Min. Typ. Max. Unit
Standard definition with progressive Attenuation scanning F2 selected/F = 54 MHz, small signal, VICM = 0.5 V, RL = 150
13 32
21 18 38
MHz
dB
High definition
Bandwidth F3 selected, small signal, VICM = 0.5 V, RL = 150 -3 dB bandwidth -1 dB bandwidth Attenuation F3 selected/F = 74.25 MHz, small signal, VICM = 0.5 V, RL = 150
25 25
36 32 32 0.5 11 0.38 0.5
MHz
dB ns ns %
D gd g Noise
Delay between each channel Group delay variation F1 selected/F = 0 to 6 MHz Differential gain F1 selected/F = 6 MHz, RL = 150 Differential phase F1 selected/F = 6 MHz, RL = 150
eN
Total input voltage noise in Standard Definition F = 100 kHz, RIN = 50 Total input voltage noise in High Definition F = 100 kHz, RIN = 50
74 nV/ z H 86
Standby mode Total current consumption in standby mode Fs1 = 1, Fs0 = 1 Tamb -40 C < Tamb < +85 C Time from standby to active mode Time from active to standby mode
ISTBY
440 480 5 5
690
A
Ton Toff
s s
Fs1, Fs0 and Mux features Vhigh Vlow High level Low level 0.9 0.3 V V
4/23
TSH345 Table 4.
Fs1 0 0 1 1
(1)
Electrical characteristics Filter and standby settings, VCC = +5 V single supply, Tamb = 25C
Fs0(1) 0 1 0 1 F3 F2 F3 Standby Settings Filtering for high definition (HD) Filtering for progressive video (PV) Filtering for standard definition (SD) TSH345 in standby mode
1. Fs1 and Fs0 pins must never be left floating.
Table 5.
Mux 0 1
Mux settings, VCC = +5 V single supply, Tamb = 25C
(1)
Settings R1 G1 B1 R2 G2 B2 Video1 selected Video2 selected
1. The MUX pin must never be left floating.
5/23
Electrical characteristics
TSH345
Figure 1.
10
Filtering
Figure 2.
6 .2
Gain flatness
0
Filter response (dB)
-1 0 PV -2 0 SD -3 0
Filter response (dB)
HD
6 .0
5 .8 HD 5 .6 SD 5 .4 PV
-4 0
V cc=5 V sm all signal Load=150
10M 1 00 M
V cc=5V s m a ll signal Load=150
1M 10 M
-5 0 1M
5 .2
Frequency (Hz)
F re q u e n c y (Hz)
Figure 3.
0 -10 -20
Distortion 1 MHz (HD)
Figure 4.
0 -10 -20
Distortion 10 MHz (HD)
HD2 & HD3 (dBc)
-40 -50 -60 -70 -80 HD3 -90 -100 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 HD2
HD2 & HD3 (dBc)
-30
Vcc=5V F= 1 MH z H D filter L o ad = 1 5 0
-30 -40 -50 -60 -70 -80 -90 -100 0.0
Vcc=5V F= 1 0 MH z H D filter L o a d =1 5 0
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 5.
0 -10 -20
Distortion 1 MHz (PV)
Figure 6.
0 -10 -20
Distortion 10 MHz (PV)
Vcc=5V F= 1 MH z P V filter L o a d= 1 5 0
HD2 & HD3 (dBc)
HD2 & HD3 (dBc)
-30 -40 -50 -60 -70 -80 HD3 -90 -100 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 HD2
-30 -40 -50 -60 -70 -80 -90 -100 0.0
Vcc=5V F= 1 0 MH z P V filter L o a d =1 5 0
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)
6/23
TSH345
Electrical characteristics
Figure 7.
0 -10 -20
Distortion 1 MHz (SD filter)
Figure 8.
1000
Input noise vs. frequency
Vcc= 5 V No load PV
HD2 & HD3 (dBc)
-30 -40 -50 -60 -70 -80
Input Noise (nV/VHz)
V cc=5 V F =1 M H z S D filter L o a d = 1 50
HD
SD
HD2
100
HD3 -90 -100 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 100 1k 10k 100k 1M
Output Amplitude (Vp-p)
Frequency (Hz)
Figure 9.
2.10
Gain vs. input amplitude
Figure 10. Channel crosstalk vs. frequency
-40
Vcc=5V Load =150
2.05
-45
-50
Input: 1Vp-p HD filter V c c =5 V L oa d = 15 0
X-Talk (dB)
0.2 0 .4 0 .6 0 .8 1 .0 1 .2 1 .4
Gain (V/V)
-55
2.00
-60
-65 1.95 -70
1.90 0 .0
-75 1M
10 M
10 0M
Vin (Vp-p)
Frequency (Hz)
Figure 11. Output vs input amplitude
5 .0 4 .5 4 .0 3 .5
Figure 12. MUX isolation
-40
Vcc=5V L o ad = 15 0
V OH
-45
Input: 1Vp-p V c c =5 V L oa d = 15 0
Vout (V)
3 .0 2 .5 2 .0 1 .5 1 .0
M UX isolation (dB)
O utput DCshift 0 .2 0 .4 0 .6 0 .8 1 .0 1 .2 1 .4 1 .6 1 .8 2 .0
-50
-55
-60
-65
-70 0 .5 0 .0 0 .0 -75 1M
10 M
10 0M
Vin (V)
Frequency (Hz)
7/23
Electrical characteristics
TSH345
Figure 13. Current consumption vs. supply
Vcc=5V no Load
40
Figure 14. Supply current vs. temperature
50 49 48
Vcc=5V no Load
Icc (mA)
30
47 46 45 44 43 42
20
10
ICC (mA)
0 .5 1.0 1 .5 2.0 2 .5 3 .0 3 .5 4 .0 4 .5 5 .0
0 0.0
41 40 -4 0
Vcc (V)
-20
0
20
40
60
80
Tem perature (C)
Figure 15. Filtering vs. temperature
40 35
Figure 16. Filter attenuation vs. temperature
60
Vcc=5V L o ad = 1 5 0 HD
55 50
Vcc=5V L o a d =1 5 0
-1dB Bandwidth (MHz)
30 25 20 15 10 5 0 -4 0
Attenuation (dB)
S D, f=27MHz
45
P V, f=54MHz
40 35
PV
HD, f=74.25MHz
30 25 20 -4 0
SD
-2 0 0 20 40 60 80
-20
0
20
40
60
80
Tem perature (C)
Tem perature (C)
Figure 17. Gain matching vs. temperature
5
Figure 18. Output DC shift vs. temperature
400 375 350 325
V cc=5 V Load=150
4
V c c= 5 V L oa d= 1 50
3
DCshift (mV)
-2 0 0 20 40 60 80
300 275 250 225 200 175
M G (%)
2
1
150 125
0 -40
100 -4 0
-20
0
20
40
60
80
T em p er atur e (C)
Tem perature (C)
8/23
TSH345
Electrical characteristics
Figure 19. Standby current vs. temperature
180
Figure 20. Isink vs. temperature
1 50 1 40 1 30 1 20
170
V c c= 5 V no Load
Istandby (A)
160
Isink (mA)
1 10 1 00 90 80 70 60
150
140
130
V cc=5 V
-20 0 20 40 60 80
120 -4 0
-2 0
0
20
40
60
80
50 -40
Temperature (C)
Tem perature (C)
Figure 21.
1 20
Isource vs. temperature
Figure 22. Ibias vs. temperature
2 .0 1 .8
V cc=5V
1 10 1 .6 1 00 1 .4
Isource (mA)
IBIAS (A)
Vcc=5V
-2 0 0 20 40 60 80
90
1 .2 1 .0 0 .8 0 .6 0 .4
80
70
60 0 .2 0 .0 -4 0
50 -4 0
-20
0
20
40
60
80
T em pe ratu re (C)
Tem p erature (C)
Figure 23. VOL vs. temperature
60
Figure 24. VOH vs. temperature
4 .0 0 3 .9 5
55 3 .9 0 50 3 .8 5
VOL (mV)
VOH (V)
V c c= 5 V L o a d =1 5 0
-2 0 0 20 40 60 80
45
3 .8 0 3 .7 5
40 3 .7 0 35 3 .6 5 3 .6 0 -4 0
V cc = 5 V Lo ad= 150
-2 0 0 20 40 60 80
30 -40
Temperature (C)
Temperature (C)
9/23
Electrical characteristics
TSH345
Figure 25. Gain vs. temperature
2 .2 0 2 .1 5 2 .1 0 2 .0 5 2 .0 0 1 .9 5 1 .9 0 1 .8 5 1 .8 0 -40
Gain (dB)
V cc=5 V L o a d = 1 50
-2 0 0 20 40 60 80
Tem perature (C)
10/23
TSH345
Electrical characteristics
2.1
Power supply considerations: improving the power supply noise rejection
Correct power supply bypassing is very important to optimize performance in low- and highfrequency 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 10 F is necessary to improve the PSRR in low frequencies. For better quality bypassing, you can add a capacitor of 100 nF (CHF). CHF must be placed as close as possible to the IC pin to improve the noise supply rejection in the higher frequencies. A coil can be added in order to better reject the noise from the supply and to prevent current peaks as much as possible. Figure 26. Circuit for power supply bypassing
+VCC
Coil CLF
+
CHF
7 R G B 8 TSH345
AM00816
11/23
Electrical characteristics Figure 27. Circuit for noise rejection improvement measurement
S R 5V
TSH345
T - bias Coil + CLF AGILENT 4395A CHF
+ SH345 50 T
50 A
AM00817
Figure 28 shows how the power supply noise rejection evolves according to the frequency and depending on how carefully power supply decoupling is achieved. Figure 28. Power supply noise rejection
0 -1 0
Noise rejection ratio (dB)
-2 0 -3 0 -4 0 -5 0 -6 0 -7 0 -8 0 10 k
Vcc=5V(dc)+0.2Vp-p(ac) Decoupling capacitor: 10F+100nF Load =150 Noise rejection=20 log (VCC/Vout)
no coil
c o il= 5 6 0 H
10 0 k
1M
10M
1 0 0M
Frequency (Hz)
12/23
TSH345
Using the TSH345 to drive YC, CVBS, YUV, YPbPr and RGB video components
3
Using the TSH345 to drive YC, CVBS, YUV, YPbPr and RGB video components
Figure 29. Implementation of the video driver on output video DACs
+5 V Reconstruction filtering LPF Vpp 2 Vpp + + + 6 dB
Y 1
Video DAC
75
5
cable
1 Vpp 5
TV
Pb
Video DAC 0.7 Vpp
Reconstruction filtering LPF + + + 6 dB
75
75
cable
0.7 Vpp 75
1.4 Vpp
Pr
Video DAC 0.7 Vpp
Reconstruction filtering LPF + + + 6 dB
5
75
cable
0.7 Vpp 75
TSH345
GND -5 V
1.4 Vpp
AM00818
13/23
Using the TSH345 to drive YC, CVBS, YUV, YPbPr and RGB video components Figure 30. Synchronization details (example for a black picture)
54 ns (4 t ) 27 ns (2 t ) 27 ns (2 t )
TSH345
·F cl o ck= 74.25 M Hz ·t= 1/ F cl o ck = 13.5 ns 300 mV Black (30IRE)
HD
300 mV
GN D 590 ns (4 4 t )
590 ns (4 4 t )
14.8 us (110 0 t): 1920/1080i 24.3 us (180 0 t): 1280/720i
s y n c .t i p 160 ns 150 ns Black (30IRE) 300 mV 4.6 us
G ND
SD
64 us
s y n c .t i p
AM00819
Figure 31. HD video signal
Video contents up to 30 MHz
1 Vp-p (+/- 5 %)
300 mV DAC's offset
GND
(DAC's offset on STi7200 = 28 mV)
AM00820
14/23
TSH345
Using the TSH345 to drive YC, CVBS, YUV, YPbPr and RGB video components
Figure 32. Standard video signal
Video contents up to 6 MHz
1.3 Vp-p (+/- 5 %)
300 mV DAC's offset
GND
(DAC's offset on STi7200 = 28 mV)
AM00821
15/23
Using the TSH345 to drive YC, CVBS, YUV, YPbPr and RGB video components Figure 33. Flexibility of the TSH345 for SD and HD signals
TSH345
HD/PV/SD Y,G DAC
150
+5V
75
TV
Cable
75
NC
75
DAC
Pb,B,C Pr,R,CVBS
150
Cable
75
NC NC
TSH345
TSSOP14 SO14
DAC
75
Cable
75
150
RCA
SCART RCA
MUX and Filter select (as defined in Table 4 and Table 5)
R-G-B Y-Pb-Pr Y-C-CVBS Y-C
CVBS
HD/PV/SD Y,G DAC
150
+5V
75
TV
Cable
75
NC
75
DAC
Pb,B,C Pr,R,CVBS
150
Cable
75
NC NC
TSH 345
TSSOP14 SO14
DAC
75
Cable
75
150
MUX and Filter select (as defined in Table 4 and Table 5)
The TSH345 is used to drive either high-definition video signals up to 30 MHz or progressive and interlaced standard definition video signals on 75- video lines. It can drive a large panel of signals such as YC and CVBS, YUV, YPbPr and RGB, where the bottom of the signal (the synchronization tip in the case of Y and CVBS signals) is close to zero volts. An internal input DC value is added to the video signal in order to shift the bottom from GND. 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. Under these conditions, it is possible to drive the signal in single supply without any saturation of the driver against the lower rail. Since half of the signal is lost through output impedance matching, in order to properly drive the video line the shifted signal is multiplied by a gain of 2 or +6 dB.
16/23
TSH345
Using the TSH345 to drive YC, CVBS, YUV, YPbPr and RGB video components
3.1
Output capacitor
The output can be either DC-coupled or AC-coupled. The output can be directly connected to the line via a 75- resistor (see Figure 34), or an output capacitor can be used to remove any DC components in the load. Assuming the load is 150 a coupling capacitor of 220 F , can be used to provide a very low cut-off frequency close to 5 Hz (see Figure 35). Figure 34. DC output coupling for SD, PV and HD
5V V ideo DAC 150 75 TSH345 + 7 75
5 cable
AM00822
Figure 35. AC output coupling
+5V V ideo DAC 150 75 TSH345 C=220 F + C S
75 cable
75
AM00823
1. CS is 100 nF used to decrease the parasitic components of C in high frequencies. It is preferable to limit the use of this output AC-coupling to the standard definition only. 2. The 75- resistor must be as close as possible to the output of the driver to minimize the effect of parasitic capacitance.
17/23
Package information
TSH345
4
Package information
In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK packages, depending on their level of environmental compliance. ECOPACK specifications, grade definitions and product status are available at: www.st.com. ECOPACK is an ST trademark.
18/23
TSH345
Package information
4.1
SO-14 package information
Figure 36. SO-14 package mechanical drawing
Table 6.
SO-14 package mechanical data
Dimensions Millimeters Inches Max. 1.75 0.25 1.65 0.51 0.25 8.75 4.0 1.27 5.80 0.25 0.40 6.20 0.50 1.27 0.22 0.009 0.015 8 (max.) 0.10 0.004 Min. 0.05 0.004 0.04 0.01 0.007 0.33 0.15 0.05 0.24 0.02 0.05 Typ. Max. 0.068 0.009 0.06 0.02 0.009 0.34 0.15
Ref. Min. A A1 A2 B C D E e H h L k ddd 1.35 0.10 1.10 0.33 0.19 8.55 3.80 Typ.
Note:
D and F dimensions do not include mold flash or protrusions. Mold flash or protrusions must not exceed 0.15 mm.
19/23
Package information
TSH345
4.2
TSSOP14 package information
Figure 37. TSSOP14 package mechanical drawing
Table 7.
TSSOP14 package mechanical data
Dimensions
Ref. Min. A A1 A2 b c D E E1 e L L1 k aaa 0 0.45 0.05 0.80 0.19 0.09 4.90 6.20 4.30
Millimeters Typ. Max. 1.20 0.15 1.00 1.05 0.30 0.20 5.00 6.40 4.40 0.65 0.60 1.00 8 0.10 0 0.75 0.018 5.10 6.60 4.50 0.002 0.031 0.007 0.004 0.193 0.244 0.169 Min.
Inches Typ. Max. 0.047 0.004 0.039 0.006 0.041 0.012 0.0089 0.197 0.252 0.173 0.0256 0.024 0.039 8 0.004 0.030 0.201 0.260 0.176
20/23
TSH345
Ordering information
5
Ordering information
Table 8. Order codes
Temperature range -40C to +85C Package SO-14 TSSOP14 Packing Tube Tape & reel Tape & reel Marking TSH345I TSH345I TSH345I
Part number TSH345ID TSH345IDT TSH345IPT
21/23
Revision history
TSH345
6
Revision history
Table 9.
Date 29-May-2007 18-Dec-2008
Document revision history
Revision 1 2 Initial release. Added curves in Chapter 2: Electrical characteristics. Added all test limits in Chapter Table 3. Changes
22/23
TSH345
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