STMicroelectronics TSH343 Datasheet
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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/ μ s
Specified for 150 Ω and 100 Ω loads
Min. and max. data tested during production
Applications
■
■
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High-end video systems
High definition TV (HDTV)
Broadcast and graphic video
Multimedia products
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 Ω 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 R-
G-B signals.
Pin1 identification
Top View
IN1 1
IN2 2
6dB
6dB
IN3 3
+Vcc 4
DC Shifter
6dB
SO8
8 OUT1
7 OUT2
6 OUT3
5 GND
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
5
Contents
Absolute maximum ratings and operating conditions . . . . . . . . . . . . . 3
Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Using the TSH343 to drive Y-Pb-Pr video components . . . . . . . . . . . . . . 10
PSRR and improvement of power supply noise rejection . . . . . . . . . . . . 12
Delay between channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2/17
TSH343
1
Absolute maximum ratings and operating conditions
Absolute maximum ratings and operating conditions
Table 1.
Symbol
V
CC
V in
T oper
T stg
T j
R thjc
R thja
P max
ESD
Absolute maximum ratings (AMR)
Parameter
Supply voltage
(1)
Input voltage range
(2)
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 (@T amb
=25°C) for T j
=150°C
CDM: charged device model
HBM: human body model
MM: machine model
Value
6
0 to +1.4
-40 to +85
-65 to +150
150
28
157
800
2
1.5
200
1.
All voltage values, except differential voltage, are with respect to network terminal.
2.
The magnitude of input and output voltages must never exceed V
CC
+0.3V.
Table 2.
Operating conditions
Symbol Parameter Value
V
CC
Power supply voltage
1.
Tested in full production at 0V/5V single power supply.
3 to 5.5
(1)
Unit
V
V
°C
°C
°C
°C/W
°C/W mW kV kV
V
Unit
V
3/17
Electrical characteristics TSH343
Table 3.
Symbol
V
CC
= +5V single supply, T amb
= 25°C (unless otherwise specified)
Parameter Test conditions Min.
Typ.
Max.
DC performance
V
DC
Input DC shift
(see
for the behaviour in temperature)
R
L
= 150 Ω , T amb
-40°C < T amb
400
< +85°C
I
I
R
C ib in in
CC
Input bias current
Input resistance
Input capacitance
Supply current per buffer
T amb
, input to GND
-40°C < T amb
< +85°C
T amb
T amb no load, input to GND
-40°C < T amb
< +85°C
PSRR
G
DG
Power supply rejection ratio
(1)
20 log ( Δ V out
/ Δ V
CC
)
DC voltage gain
Variation of the DC voltage gain between inputs of 0.3V and 1V
F = 1MHz
R
L
= 150 Ω, V in
= 1V
Input step from 0.3V to 1V
MG
1
MG
0.3
Gain matching between 3 channels
Gain matching between 3 channels
Dynamic performance and output characteristics
Input = 1V
Input = 0.3V
1.92
FPBW
I
Bw
D
SR
V
V
OH
OL
OUT
-3dB bandwidth
Gain flatness @ 0.1dB
Full power bandwidth
Delay between each channel
Slew rate
(3)
High level output voltage
Low level output voltage
Output current
Output short-circuit current (I
(2) source
)
530
18.2
20.7
4
1
14.4
14.9
-45
1.99
0.26
0.5
0.5
Small signal V out
R
L
= 150 Ω
= 20mVp
Small signal V out
R
L
= 150 Ω
= 20mVp
V out
R
L
= 2V p-p
= 150 Ω
, V
ICM
= 0.5V,
0 to 30MHz
160
130
280
65
200
0.5
Input step from 0V to 1V,
R
L
= 150 Ω
V in DC
= +1.5V, R
L
= 150 Ω
500
3.7
780
3.9
R
L
= 150 Ω 40
45 90 V out
= 2V, T amb
-40°C < T amb
< +85°C 82
100
35
18
2.05
0.8
2
2
Unit mV
MHz dB
V/V
%
%
%
μ A
G Ω pF mA
MHz ns
V/ μ s
V mV mA mA
4/17
TSH343 Electrical characteristics
Table 3.
Symbol
V
CC
= +5V single supply, T
Noise and distortion
Parameter amb
= 25°C (unless otherwise specified) (continued)
Test conditions Min.
Typ.
Max.
Unit eN Total input voltage noise
HD2 2nd harmonic distortion
HD3 3rd harmonic distortion
F = 100kHz, R
IN
= 50 Ω
10kHz to 30MHz
10kHz to 100MHz
V out
= 2V p-p
, R
L
= 150 Ω
F= 10MHz
F= 30MHz
V out
= 2Vp-p, R
L
= 150 Ω
F= 10MHz
F= 30MHz
29
158
290
-58
-45
-72
-50 nV/ √ Hz
μ Vrms dBc dBc
1.
See
2.
See
3.
Non-tested value, guaranteed by design.
5/17
Electrical characteristics TSH343
Figure 1.
Frequency response
10
8
6
4
2
0
-2
-4
-6
-8
-10
1M
Vcc=5V
Load=150 Ω
10M
Frequency (Hz)
100M
Figure 3.
Cross-talk vs. frequency (amp1)
-50
-60
-70
-80
-90
-100
1M
0
-10
-20
-30
-40
Small Signal
Vcc=5V
Load=150 Ω
1/2
1/3
10M
Frequency (Hz)
100M
Figure 5.
Cross-talk vs. frequency (amp3)
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
1M
Small Signal
Vcc=5V
Load=150 Ω
3/1
3/2
10M
Frequency (Hz)
100M
1G
Figure 2.
Gain flatness
6,20
6,15
6,10
6,05
6,00
5,95
5,90
5,85
5,80
5,75
5,70
1M
Vcc=5V
Load=150 Ω
10M
Frequency (Hz)
100M
Figure 4.
0
-10
-20
-30
Small Signal
Vcc=5V
Load=150 Ω
-40
-50
-60
-70
-80
-90
-100
1M
Figure 6.
Input noise vs. frequency
100
10
10
Cross-talk vs. frequency (amp2)
100
2/1
10M
Frequency (Hz)
NA
2/3
1k 10k
Frequency (Hz)
100k
100M
Vcc=5V input in short-circuit
1M
1G
10M
6/17
TSH343 Electrical characteristics
Figure 7.
Distortion on 150
Ω
load - 10MHz
-30
-35
-40
-45
-50
-55
-60
Vcc=5V
F=10MHz input DC component = 0.65V
Load=150 Ω
HD2
-65
-70
-75
-80
-85
-90
-95
-100
0,0 0,5
HD3
1,0 1,5 2,0 2,5
Output Amplitude (Vp-p)
3,0 3,5 4,0
Figure 8.
Distortion on 100
Ω
load - 10MHz
-30
-35
-40
-45
-50
-55
-60
-65
-70
Vcc=5V
F=10MHz input DC component = 0.65V
Load=100 Ω
HD2
-75
-80
-85
-90
-95
-100
0,0 0,5
HD3
1,0 1,5 2,0 2,5
Output Amplitude (Vp-p)
3,0 3,5 4,0
Figure 9.
Distortion on 150
Ω
load - 30MHz
-10
-15
-40
-45
-50
-55
-60
-65
-70
-75
-20
-25
-30
-35
Vcc=5V
F=30MHz input DC component = 0.65V
Load=150 Ω
HD2
HD3
-80
0,0 0,5 3,5 1,0 1,5 2,0 2,5
Output Amplitude (Vp-p)
3,0 4,0
Figure 10. Distortion on 100
Ω
load - 30MHz
-10
-15
-20
-25
-30
-35
Vcc=5V
F=30MHz input DC component = 0.65V
Load=100 Ω
-40
-45
-50
-55
-60
-65
-70
-75
-80
0,0
HD2
0,5
HD3
3,5 1,0 1,5 2,0 2,5
Output Amplitude (Vp-p)
3,0 4,0
Figure 11. Output DC shift vs. frequency
1,4
Figure 12. Slew rate
3,5
1,2
1,0
0,8
0,6
1M
Vcc=5V
Load=150 Ω
10M
Frequency (Hz)
100M
3,0
2,5
2,0
1,5
1,0
0,5
0,0
-5
Vcc=5V
Load=150 Ω
-4 -3 -2 -1 0
Time (ns)
1 2
SR+
SR-
3 4 5
7/17
Electrical characteristics TSH343
Figure 13. Reverse isolation vs. frequency
0
-10
-20
Vcc=5V
Load=100 Ω
-30
-40
-50
-60
-70
-80
-90
-100
1M 10M
Frequency (Hz)
100M
Figure 14. Bandwidth vs. temperature
500
450
400
350
300
250
200
150
100
-40
Vcc=5V
Load=150 Ω
-20 0 20 40
Temperature (°C)
60 80
Figure 15. Quiescent current vs. supply
50
45
40
35
30
25
20
15
10
5
0
0,0
Vcc=5V
Input to ground, no load
0,5 1,0 1,5 2,0 2,5
Vcc (V)
3,0 3,5 4,0 4,5 5,0
Figure 16. Input DC shift vs. temperature
0,8
0,7
0,6
0,5
0,4
0,3
0,2
-40
Vcc=5V
Load=150 Ω
-20 0 20 40
Temperature (°C)
60 80
Figure 17. I source
vs. output voltage
-60
-70
-80
-90
-100
-110
-120
0,0
0
-10
-20
-30
-40
-50
0,5
+5V
V OH without load
0V
1,0 1,5
Isource
V
2,0 2,5
V (V)
3,0 3,5 4,0 4,5 5,0
Figure 18. Voltage gain vs. temperature
2,05
2,04
2,03
2,02
2,01
2,00
1,99
1,98
1,97
1,96
1,95
-40
Vcc=5V
Load=150 Ω
-20 0 20 40
Temperature (°C)
60 80
8/17
TSH343 Electrical characteristics
Figure 19. I
20
18
16
14
24
22 bias
vs. temperature Figure 20. Gain deviation vs. temperature
1,0
0,8
0,6
0,4
Gain deviation between
0.3V and 1V input voltages
Vcc=5V
Load=150 Ω
0,2
12
10
-40
Vcc=5V
Load=150 Ω
-20 0 20 40
Temperature (°C)
60
Figure 21. Supply current vs. temperature
17
80
0,0
-40 -20 0 20 40
Temperature (°C)
60 80
Figure 22. Output current vs. temperature
110
16
100
15
90
14
80
13
70
12
11
10
-40
Vcc=5V no Load
-20
60
50
-40
Vcc=5V
Load=150 Ω
-20 0 20 40
Temperature (°C)
60 80
0,4
60
Figure 23. Output higher rail vs. temperature Figure 24. Gain matching vs. temperature
1,0
4,2
4,1
4,0
0,8
Gain matching between 3 channels
Vcc=5V
Load=150 Ω
Vin=0.3V and 1V
0,6
3,9
3,8
0 20 40
Temperature (°C)
80
3,7
3,6
3,5
-40
Vcc=5V
Load=150 Ω
-20 0 20 40
Temperature (°C)
60 80
0,2
0,0
-40 -20 0 20 40
Temperature (°C)
60 80
9/17
Application information TSH343
3.1 Using the TSH343 to drive Y-Pb-Pr video components
Figure 25.
Shapes of video signals coming from DACs
White (100 IRE)
1.030V
300mV
GND
10mV
27ns
(2t)
54ns
(4t)
590ns
(44t)
27ns
(2t)
590ns
(44t)
Synchronization tip
300mV 700mV
14.8
µ s (1100t): 1920*1080i
24.3
µ s (1800t): 1280*720i
Black (30 IRE)
0.330V
(0 IRE)
0.030V
time
•Fclock=74.25MHz
•t=1/Fclock=13.5ns
Amplitude
1Vp-p
Frequency
30MHz
Figure 26.
TSH343 in single supply for any DAC output video outputs
Y,G
(+synchro)
DAC
DAC
Pb,B
DAC
Pr,R
+5V
TSH343
SO8
75 Ω
75
Ω
75
Ω
LPF
LPF
LPF
Cable
Cable
Cable
HDTV video outputs
DAC
R
DAC
G
DAC
B
+5V
75 Ω
LPF
TSH344
SO8
75 Ω
75 Ω
LPF
LPF
Digital synchro
Cable
Cable
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 Application information
Figure 27.
Detailed view of one TSH343 channel
+5V
STB TV
DAC
140 Ω
600mV
DC
+ 1/3 TSH343
(gain=2)
75 Ω
470nH
68pF 68pF video line
5Volt
-5V
0V
3,22V
5Volt
1,01V
10mV
0Volt
1,22V (10mV+600mV)*gain
0Volt
75 Ω
5Volt
1,61V
610mV
0Volt
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.
shows a solution used on the STMicroelectronics reference design of STi7100 or
STi7200 where the DAC output is loaded by 140
Ω
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
3.2 PSRR and improvement of power supply noise rejection
Figure 28.
Circuit for power supply bypassing
TSH343
C
LF
75 Ω
C
HF
50 Ω
12/17
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
L= Ferrite FBMJ4516HM900
CHF=100nF
CLF=10uF
-40
-50
-60
-70
-80
100k
L=2uH
CHF=100nF
CLF=10uF
1M
Frequency (Hz)
10M
PSRR
100M
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.
TSH343
3.3 Delay between channels
Figure 30.
Measurement of the delay between each channel
600mV
+6dB
5V
75 Ω
75
Ω
Cable
Application information
75 Ω
V1
Vin
75 Ω
600mV
+6dB
75 Ω
75
Ω
Cable
75 Ω
V2
600mV
+6dB
75 Ω
75
Ω
Cable
75 Ω
V3
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 V in
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
Vcc=5V
Load=150 Ω
-4ns -2ns 0s 2ns 4ns 6ns 8ns 10ns 12ns 14ns 16ns 18ns 20ns
Time
13/17
Package mechanical data
4 Package mechanical data
TSH343
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
TSH343 Package mechanical data e h
L k ccc c
D
E
E1
A
A1
A2 b
Figure 32.
SO-8 package
Ref.
Min.
0.10
1.25
0.28
0.17
4.80
5.80
3.80
Dimensions
Millimeters
Typ.
Max.
1.75
0.25
Min.
4.90
6.00
3.90
1.27
0.48
0.23
5.00
6.20
4.00
0.004
0.049
0.011
0.007
0.189
0.228
0.150
0.25
0.40
1°
0.50
1.27
8°
0.10
0.010
0.016
1°
Inches
Typ.
0.193
0.236
0.154
0.050
Max.
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
Table 4.
Order codes
Part number Temperature range
TSH343ID
TSH343IDT
-40°C to +85°C
Package
SO-8
Packing
Tube
Tape & reel
Marking
TSH343I
TSH343I
Table 5.
Date
1-Dec-2005
2-Jan-2006
10-Jul-2006
7-Mar-2007
Document revision history
Revision
1
2
3
4
Changes
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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