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 Ω loads
TSSOP14
R1 in 1
R2 in 2
Data min. and max. are tested during
production
G1 in 3
MUX
■
SO-14
MUX
■
Applications
High-end video systems
■
High definition TV (HDTV)
■
Broadcast and graphic video
■
Multimedia products
B1 in 5
MUX
■
G2 in 4
B2 in 6
36MHz
18MHz
9MHz
LPF
36MHz
18MHz
9MHz
LPF
36MHz
18MHz
9MHz
LPF
14 Fs0
+
6dB
13 Fs1
12 R out
+
6dB
11 G out
10 B out
+
6dB
9 Mux
DC Shifter
+VCC 7
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 Ω
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 Ω
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
Absolute maximum ratings and operating conditions
Table 1.
Absolute maximum ratings
Symbol
Parameter
VCC
Supply voltage (1)
Vin
Input voltage range
Value
Unit
6
V
2.5
V
Toper
Operating free air temperature range
-40 to +85
°C
Tstg
Storage temperature
-65 to +150
°C
Maximum junction temperature
150
°C
Rthjc
Thermal resistance junction to case
SO-14
TSSOP14
22
32
°C/W
Rthja
Thermal resistance junction to ambient area
SO-14
TSSOP14
125
110
°C/W
Pmax
Maximum power dissipation (at Tamb = 25° C) for Tj = 150° C
SO-14
TSSOP14
1
1.1
W
ESD
CDM: charged device model
HBM: human body model
MM: machine model
250
2
100
V
kV
V
Tj
1. All voltage values, except differential voltage, are with respect to network terminal.
Table 2.
Operating conditions
Symbol
VCC
Parameter
Power supply voltage
1. Tested in full production with +5 V single power supply.
2/23
Value
4.5 to
5.5(1)
Unit
V
TSH345
2
Electrical characteristics
Electrical characteristics
Table 3.
Electrical characteristics at VCC = +5 V single supply, Tamb = 25°C
(unless otherwise specified)
Symbol
Test conditions
Min.
Typ.
Max.
Unit
100
240
310
440
mV
1.3
1.4
3.6
µA
DC performance
VDC
Output DC shift
RL = 150 Ω, Tamb
-40° C < Tamb < +85° C
Iib
Input bias current
Tamb , input to GND
-40° C < Tamb < +85° C
Rin
Input resistance, Tamb
Cin
ICC
G
1
MΩ
Input capacitance, Tamb
0.1
pF
Total supply current (3 x operators)
No load, input to GND
-40°C < Tamb < +85°C
44.6
45
51.6
mA
1.96
2
1.96
2.05
V/V
3.4
3.9
3.8
V
47
mV
DC voltage gain
RL = 150Ω, Vin = 1.4V
-40°C < Tamb < +85°C
Output characteristics
VOH
High level output voltage
RL = 150 Ω
-40° C < Tamb < +85° C
VOL
Low level output voltage
RL = 150 Ω
Iout
Isource
Tamb
-40° C < Tamb < +85° C
76
100
91
mA
Isink
-40° C < Tamb < +85° C
106
134
126
mA
Filtering
Standard
definition
Bandwidth
F1 selected, small signal, VICM= 0.5 V, RL = 150 Ω
-3 dB bandwidth
-1 dB bandwidth
Attenuation
F1 selected/F=27 MHz, small signal, VICM = 0.5 V,
RL = 150 Ω
5
9
5.7
40
45
MHz
dB
3/23
Electrical characteristics
Table 3.
TSH345
Electrical characteristics at VCC = +5 V single supply, Tamb = 25°C
(unless otherwise specified) (continued)
Symbol
Test conditions
Bandwidth
F2 selected, small signal, VICM = 0.5 V, RL = 150 Ω
-3 dB bandwidth
-1 dB bandwidth
Standard
definition
with
progressive
Attenuation
scanning
F2 selected/F = 54 MHz, small signal,
VICM = 0.5 V, RL = 150 Ω
High
definition
Bandwidth
F3 selected, small signal, VICM = 0.5 V, RL = 150 Ω
-3 dB bandwidth
-1 dB bandwidth
Attenuation
F3 selected/F = 74.25 MHz, small signal,
VICM = 0.5 V, RL = 150 Ω
Min.
Typ.
Max.
Unit
13
21
18
32
38
25
36
32
25
32
dB
MHz
dB
MHz
D
Delay between each channel
0.5
ns
gd
Group delay variation
F1 selected/F = 0 to 6 MHz
11
ns
Δg
Differential gain
F1 selected/F = 6 MHz, RL = 150 Ω
0.38
%
ΔΦ
Differential phase
F1 selected/F = 6 MHz, RL = 150 Ω
0.5
°
Total input voltage noise in Standard Definition
F = 100 kHz, RIN = 50 Ω
74
Total input voltage noise in High Definition
F = 100 kHz, RIN = 50 Ω
86
Noise
eN
nV/√Hz
Standby mode
ISTBY
Total current consumption in standby mode
Fs1 = 1, Fs0 = 1
Tamb
-40° C < Tamb < +85° C
440
480
690
µA
Ton
Time from standby to active mode
5
µs
Toff
Time from active to standby mode
5
µs
Fs1, Fs0 and Mux features
4/23
Vhigh
High level
Vlow
Low level
0.9
V
0.3
V
TSH345
Electrical characteristics
Table 4.
Filter and standby settings, VCC = +5 V single supply, Tamb = 25°C
(1)
Fs0(1)
Fs1
Settings
0
0
F3
Filtering for high definition (HD)
0
1
F2
Filtering for progressive video (PV)
1
0
F3
Filtering for standard definition (SD)
1
1
Standby
TSH345 in standby mode
1. Fs1 and Fs0 pins must never be left floating.
Table 5.
Mux settings, VCC = +5 V single supply, Tamb = 25°C
(1)
Mux
Settings
0
R1 G1 B1
Video1 selected
1
R2 G2 B2
Video2 selected
1. The MUX pin must never be left floating.
5/23
Electrical characteristics
Figure 1.
TSH345
Filtering
Figure 2.
10
6.2
6.0
HD
Filter response (dB)
Filter response (dB)
0
-10
PV
-20
SD
-30
-40
Gain flatness
5.8
HD
SD
5.4
Vcc=5V
small signal
Load=150Ω
-50
1M
PV
5.6
Vcc=5V
small signal
Load=150 Ω
5.2
10M
100M
1M
Frequency (Hz)
Figure 3.
Distortion 1 MHz (HD)
Figure 4.
0
-20
HD2 & HD3 (dBc)
-30
Vcc=5V
F=1MHz
HD filter
Load=150 Ω
-10
-20
-40
-50
-60
Distortion 10 MHz (HD)
0
HD2 & HD3 (dBc)
-10
HD2
-70
-80
-30
Vcc=5V
F=10MHz
HD filter
Load=150 Ω
-40
-50
HD2
-60
-70
-80
HD3
HD3
-90
-90
-100
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
-100
0.0
4.0
0.5
1.0
Output Amplitude (Vp-p)
Figure 5.
-20
Distortion 1 MHz (PV)
Figure 6.
-10
-20
HD2 & HD3 (dBc)
HD2 & HD3 (dBc)
-40
-50
HD2
-70
-80
-30
-40
3.0
3.5
4.0
3.0
3.5
4.0
Distortion 10 MHz (PV)
Vcc=5V
F=10MHz
PV filter
Load=150 Ω
HD2
-60
-70
-80
HD3
-90
0.5
1.0
1.5
2.0
2.5
Output Amplitude (Vp-p)
6/23
2.5
-50
HD3
-90
-100
0.0
2.0
0
Vcc=5V
F=1MHz
PV filter
Load=150 Ω
-30
-60
1.5
Output Amplitude (Vp-p)
0
-10
10M
Frequency (Hz)
3.0
3.5
4.0
-100
0.0
0.5
1.0
1.5
2.0
2.5
Output Amplitude (Vp-p)
TSH345
Electrical characteristics
Figure 7.
Distortion 1 MHz (SD filter)
Figure 8.
0
HD2 & HD3 (dBc)
-20
-30
1000
Vcc=5V
F=1MHz
SD filter
Load=150 Ω
-40
-50
HD2
-60
Vcc=5V
No load
HD
Input Noise (nV/VHz)
-10
Input noise vs. frequency
-70
PV
SD
100
-80
HD3
-90
-100
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
100
Output Amplitude (Vp-p)
Figure 9.
10k
100k
1M
Frequency (Hz)
Gain vs. input amplitude
Figure 10. Channel crosstalk vs. frequency
2.10
-40
Vcc=5V
Load=150Ω
-45
2.05
-50
X-Talk (dB)
Gain (V/V)
1k
2.00
Input: 1Vp-p
HD filter
Vcc=5V
Load=150Ω
-55
-60
-65
1.95
-70
1.90
0.0
0.2
0.4
0.6
0.8
1.0
1.2
-75
1M
1.4
10M
Vin (Vp-p)
Figure 11. Output vs input amplitude
Figure 12. MUX isolation
5.0
4.5
-40
Vcc=5V
Load=150Ω
-45
4.0
MUX isolation (dB)
VOH
3.5
Vout (V)
100M
Frequency (Hz)
3.0
2.5
2.0
1.5
Input: 1Vp-p
Vcc=5V
Load=150Ω
-50
-55
-60
-65
1.0
-70
0.5
Output DCshift
0.0
0.0
0.2
0.4
0.6
0.8
1.0
Vin (V)
1.2
1.4
1.6
1.8
2.0
-75
1M
10M
100M
Frequency (Hz)
7/23
Electrical characteristics
TSH345
Figure 13. Current consumption vs. supply
Figure 14. Supply current vs. temperature
Vcc=5V
no Load
50
49
40
Vcc=5V
no Load
47
30
ICC (mA)
Icc (mA)
48
20
46
45
44
43
10
42
41
0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
40
-40
Vcc (V)
-20
0
20
40
60
80
Temperature (°C)
Figure 15. Filtering vs. temperature
Figure 16. Filter attenuation vs. temperature
40
60
Vcc=5V
Load=150Ω
Vcc=5V
Load=150Ω
55
HD
30
25
20
PV
15
50
Attenuation (dB)
-1dB Bandwidth (MHz)
35
10
SD, f=27MHz
45
PV, f=54MHz
40
35
HD, f=74.25MHz
30
5
25
SD
0
-40
-20
0
20
40
60
20
-40
80
-20
Temperature (°C)
0
20
40
60
80
Temperature (°C)
Figure 17. Gain matching vs. temperature
Figure 18. Output DC shift vs. temperature
5
400
Vcc=5V
Load=150 Ω
375
350
4
Vcc=5V
Load=150Ω
DCshift (mV)
325
MG (%)
3
2
300
275
250
225
200
175
1
150
125
0
-40
-20
0
20
40
Temperature (°C)
8/23
60
80
100
-40
-20
0
20
40
Temperature (°C)
60
80
TSH345
Electrical characteristics
Figure 19. Standby current vs. temperature
Figure 20. Isink vs. temperature
150
180
Vcc=5V
no Load
140
130
120
160
Isink (mA)
Istandby (µA)
170
150
140
110
100
90
80
70
130
60
120
-40
-20
0
20
40
60
Vcc=5V
50
-40
80
-20
0
Temperature (°C)
Figure 21.
20
40
60
80
60
80
60
80
Temperature (°C)
Isource vs. temperature
Figure 22. Ibias vs. temperature
2.0
120
1.8
Vcc=5V
110
1.6
1.4
90
IBIAS (μA)
Isource (mA)
100
80
1.2
1.0
0.8
0.6
70
0.4
60
0.2
Vcc=5V
50
-40
-20
0
20
40
60
0.0
-40
80
-20
Temperature (°C)
0
20
40
Temperature (°C)
Figure 23. VOL vs. temperature
Figure 24. VOH vs. temperature
4.00
60
3.95
55
3.90
3.85
VOH (V)
VOL (mV)
50
45
3.80
3.75
40
3.70
35
30
-40
Vcc=5V
Load=150Ω
-20
3.65
0
20
40
Temperature (°C)
60
80
3.60
-40
Vcc=5V
Load=150Ω
-20
0
20
40
Temperature (°C)
9/23
Electrical characteristics
TSH345
Figure 25. Gain vs. temperature
2.20
2.15
Gain (dB)
2.10
2.05
2.00
1.95
1.90
1.85
1.80
-40
Vcc=5V
Load=150Ω
-20
0
20
40
Temperature (°C)
10/23
60
80
TSH345
2.1
Electrical characteristics
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 µF 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
TSH345
B
8
AM00816
11/23
Electrical characteristics
TSH345
Figure 27. Circuit for noise rejection improvement measurement
S
R
+5 V
T-bias
+
Coil
CLF
AGILENT
4395A
CHF
50 7
A
TSH345
50 7
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
Noise rejection ratio (dB)
-10
-20
Vcc=5V(dc)+0.2Vp-p(ac)
Decoupling capacitor: 10µF+100nF
Load=150Ω
Noise rejection=20 log (ΔVCC/ΔVout)
-30
no coil
-40
-50
-60
-70
-80
10k
coil=560µH
100k
1M
Frequency (Hz)
12/23
10M
100M
TSH345
3
Using the TSH345 to drive YC, CVBS, YUV, YPbPr and RGB video components
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
Y
Video
DAC
Reconstruction
filtering
75 7
++
LPF
75 7cable
+ 6 dB
1 Vpp
TV
75 7
1 Vpp
2 Vpp
Pb
Video
DAC
Reconstruction
filtering
75 7
++
LPF
75 7cable
+ 6 dB
0.7 Vpp
75 7
0.7 Vpp
0.
1.4 Vpp
1.
Pr
Video
DAC
Reconstruction
filtering
LPF
75 7
++
+ 6 dB
75 7cable
0.7 Vpp
75 7
0.7 Vpp
0.
TSH345
1.4 Vpp
1.
GND
-5 V
AM00818
13/23
Using the TSH345 to drive YC, CVBS, YUV, YPbPr and RGB video components
TSH345
Figure 30. Synchronization details (example for a black picture)
54 ns
(4t)
27 ns
(2t)
27 ns
(2t)
590 ns
(44 t)
HD
•Fclock=74.25 MHz
•t=1/Fclock=13.5 ns
300 mV
Black (30IRE)
300 mV
14.8 us (110 0t): 1920/1080i
24.3 us (180 0t): 1280/720i
590 ns
(44 t)
GN D
s yn c.t ip
160 ns
150 ns
SD
Black (30IRE)
64 us
300 mV
4.6 us
G ND
s yn c.t ip
AM00819
Figure 31. HD video signal
Video contents up to 30 MHz
1 Vp-p (+/- 5 %)
300 mV
GND
DAC’s offset
(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
GND
DAC’s offset
(DAC’s offset on STi7200 = 28 mV)
AM00821
15/23
Using the TSH345 to drive YC, CVBS, YUV, YPbPr and RGB video components
TSH345
Figure 33. Flexibility of the TSH345 for SD and HD signals
HD/PV/SD
Y,G
DAC
+5V
150Ω
DAC
150Ω
DAC
150Ω
Cable
75Ω
Cable
75Ω
Cable
NC
75Ω
Pb,B,C
Pr,R,CVBS
TV
75Ω
NC
NC
TSH345
TSSOP14
SO14
75Ω
75Ω
RCA
SCART
RCA
MUX and Filter select
(as defined in Table 4
and Table 5)
CVBS
R-G-B
Y-Pb-Pr
Y-C-CVBS
HD/PV/SD
Y,G
DAC
+5V
150Ω
DAC
Pr,R,CVBS
150Ω
TV
75Ω
Cable
75Ω
Cable
75Ω
Cable
NC
75Ω
Pb,B,C
150Ω
DAC
Y-C
NC
NC
TSH345
TSSOP14
SO14
75Ω
75Ω
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-Ω 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
3.1
Using the TSH345 to drive YC, CVBS, YUV, YPbPr and RGB video components
Output capacitor
The output can be either DC-coupled or AC-coupled. The output can be directly connected
to the line via a 75-Ω resistor (see Figure 34), or an output capacitor can be used to remove
any DC components in the load. Assuming the load is 150 Ω, a coupling capacitor of 220 µF
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
75 7
Video
DAC
75 7cable
TSH345
75 7
150 7
AM00822
Figure 35. AC output coupling
+5V
75 7
Video
DAC
TSH345
C=220 µF
+
75 7 cable
75 7
150 7
CS
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-Ω resistor must be as close as possible to the output of the driver to minimize the effect of parasitic
capacitance.
17/23
Package information
4
TSH345
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
4.1
Package information
SO-14 package information
Figure 36. SO-14 package mechanical drawing
Table 6.
SO-14 package mechanical data
Dimensions
Millimeters
Inches
Ref.
Min.
Typ.
Max.
Min.
Max.
A
1.35
1.75
0.05
0.068
A1
0.10
0.25
0.004
0.009
A2
1.10
1.65
0.04
0.06
B
0.33
0.51
0.01
0.02
C
0.19
0.25
0.007
0.009
D
8.55
8.75
0.33
0.34
E
3.80
4.0
0.15
0.15
e
1.27
0.05
H
5.80
6.20
0.22
0.24
h
0.25
0.50
0.009
0.02
L
0.40
1.27
0.015
0.05
k
ddd
Note:
Typ.
8° (max.)
0.10
0.004
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
4.2
TSH345
TSSOP14 package information
Figure 37. TSSOP14 package mechanical drawing
Table 7.
TSSOP14 package mechanical data
Dimensions
Ref.
Millimeters
Min.
Typ.
A
Max.
Min.
Typ.
1.20
A1
0.05
A2
0.80
b
Max.
0.047
0.15
0.002
0.004
0.006
1.05
0.031
0.039
0.041
0.19
0.30
0.007
0.012
c
0.09
0.20
0.004
0.0089
D
4.90
5.00
5.10
0.193
0.197
0.201
E
6.20
6.40
6.60
0.244
0.252
0.260
E1
4.30
4.40
4.50
0.169
0.173
0.176
e
L
k
aaa
1.00
0.65
0.45
L1
20/23
Inches
0.60
0.0256
0.75
0.018
1.00
0°
0.024
0.030
0.039
8°
0.10
0°
8°
0.004
TSH345
5
Ordering information
Ordering information
Table 8.
Order codes
Part number
Temperature
range
TSH345ID
TSH345IDT
TSH345IPT
-40°C to +85°C
Package
SO-14
TSSOP14
Packing
Marking
Tube
TSH345I
Tape & reel
TSH345I
Tape & reel
TSH345I
21/23
Revision history
6
TSH345
Revision history
Table 9.
22/23
Document revision history
Date
Revision
Changes
29-May-2007
1
Initial release.
18-Dec-2008
2
Added curves in Chapter 2: Electrical characteristics.
Added all test limits in Chapter Table 3.
TSH345
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