STMicroelectronics TSH344 Datasheet
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TSH344
340MHz single-supply triple video buffer
Features
■
■
■
■
■
■
■
■
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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 Ω and 100 Ω loads
Tested on 5V power supply
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 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 Ω .
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.
Pin connections (top view)
Pin1 identification
Top View
IN1 1 6dB 8 OUT1
IN2 2 6dB
7 OUT2
IN3 3
+Vcc 4
6dB 6 OUT3
5 GND
SO8
March 2007 Rev 4 1/17 www.st.com
17
1
Contents
Contents
TSH344
Absolute maximum ratings and operating conditions . . . . . . . . . . . . . 3
Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Using the TSH344 to drive R-G-B video components . . . . . . . . . . . . . . . 10
Power supply considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Delay between channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
2/17
TSH344
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 +2
-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 voltage must never exceed V
CC
+0.3V.
Table 2.
Operating conditions
Symbol Parameter Value
V
CC
Power supply voltage
(1)
1.
Tested in full production at 0V/5V single power supply.
3 to 5.5
Unit
V
V
°C
°C
°C
°C/W
°C/W mW kV kV
V
Unit
V
3/17
Electrical characteristics TSH344
Table 3.
Symbol
V
CC
= +5V single supply, T amb
= 25°C (unless otherwise specified)
Parameter Test conditions Min.
Typ.
DC performance
V
I
I
R
C
OS ib in in
PSRR
CC
G
MG1
Output offset voltage
Input bias current
Input resistance
Input capacitance
(1)
No load, T amb
-35
-40°C < T amb
< +85°C
T amb
, input to GND
-40°C < T amb
< +85°C
T amb
T amb
Input to GND, F=1MHz,
Δ V
CC
=200mV
Power supply rejection ratio
20 log ( Δ V
CC
/ Δ V out
)
(2)
No load, input to GND
Supply current per buffer
DC voltage gain
-40°C < T amb
< +85°C
R
L
= 150 Ω, V in
=1V
Gain matching between 3 channels Input = 1V
1.92
MG0.3
Gain matching between 3 channels Input = 0.3V
Dynamic performance and output characteristics
I
Bw
FPBW
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
-90
Small signal V out
=20mVp
V icm
=0.6V, R
L
= 150 Ω
Small signal V out
=20mVp
V icm
=0.6V, R
L
= 150 Ω
V icm
R
L
=0.6V, V
= 150
Ω out
= 2Vp-p,
0 to 30MHz
190
130
340
65
200
0.5
V icm
R
L
=0.6V, V
= 150 Ω out
= 2Vp-p,
R
L
= 150 Ω
500
3.7
740
3.9
R
L
= 150 Ω 40
45 93 V out
= 2Vp, T amb
-40°C < T amb
< +85°C 83
10.1
10.3
2
0.5
0.5
-8
-8.6
5.5
6
4
1
Output short circuit current
(I source
)
100
Max.
+35
16
13
2.05
2
2
60
Unit mV
MHz
MHz ns
V/ μ s
V mV mA mA
μ A
G Ω pF dB mA
V/V
%
%
4/17
TSH344 Electrical characteristics
Table 3.
Symbol
V
CC
= +5V single supply, T amb
= 25°C (unless otherwise specified)
Parameter Test conditions Min.
Typ.
Noise and distortion eN
HD2
HD3
Total input voltage noise
2nd harmonic distortion
3rd harmonic distortion
F = 100kHz, R in
= 50 Ω
R in
= 50 Ω
Bw=30MHz
Bw=100MHz
V out
= 2Vp-p, R
L
= 150 Ω
F= 10MHz
F= 30MHz
V out
= 2Vp-p, R
L
= 150 Ω
F= 10MHz
F= 30MHz
1.
Output offset voltage is determined by the following expression: V
OUT
=G.
V
IN
+ V
OS
.
2.
See
3.
Non-tested value, guaranteed by design and evaluation. See Figure 12
.
8
55
100
-57
-42
-72
-51
Max.
Unit nV/ √ Hz
μ Vrms dBc dBc
5/17
Electrical characteristics TSH344
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)
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
1M
Small Signal
Vcc=5V
Load=150 Ω
1/2
1/3
10M
Frequency (Hz)
100M
1G
Figure 2.
Gain flatness
6,2
6,1
6,0
5,9
5,8
5,7
5,6
5,5
5,4
5,3
5,2
1M
Vcc=5V
Load=150 Ω
10M
Frequency (Hz)
100M
Figure 4.
-40
-60
-80
-100
1M
Cross-talk vs. frequency (amp2)
0
-20
Small Signal
Vcc=5V
Load=150 Ω
2/1
2/3
10M
Frequency (Hz)
100M
1G
Figure 5.
Cross-talk vs. frequency (amp3) Figure 6.
Input noise vs. frequency
0
-20
Small Signal
Vcc=5V
Load=150 Ω
Vcc=5V
DC input = 1.5V (Battery)
100
-40
-60
3/1
-80
-100
1M
3/2
10M
Frequency (Hz)
100M
10
10 100 1k 10k
Frequency (Hz)
100k 1M 10M
6/17
TSH344 Electrical characteristics
Figure 7.
Distortion on 150
Ω
load - 10MHz
-30
-35
-40
-45
-50
Vcc=5V
F=10MHz input DC component = 1.15V
Load=150 Ω
-55
-60
-65
-70
-75
-80
-85
-90
-95
-100
0,0 0,5
HD2
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
Vcc=5V
F=10MHz input DC component = 1.15V
Load=100 Ω
-55
-60
-65
-70
-75
-80
-85
-90
-95
-100
0,0 0,5
HD2
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
-20
-25
-30
-35
Vcc=5V
F=30MHz input DC component = 1.15V
Load=150 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 10.
Distortion on 100
Ω
load - 30MHz
-10
-15
-20
-25
-30
-35
Vcc=5V
F=30MHz input DC component = 1.15V
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 current
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-110
-120
0,0 0,5
+5V
V OH without load
1,0
0V
1,5
Isource
V
2,0 2,5
V (V)
3,0 3,5 4,0 4,5 5,0
Figure 12.
Slew rate
4,0
3,5
3,0
2,5
2,0
1,5
1,0
0,5
0,0
-2
Vcc=5V
Load=150 Ω
-1 0 1 2 3
Time (ns)
4
SR+
SR-
5 6 7 8
7/17
Electrical characteristics TSH344
Figure 13.
Reverse isolation vs. frequency
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
1M
Vcc=5V
Load=150 Ω
10M
Frequency (Hz)
100M
Figure 15.
Quiescent current vs. supply
30
Vcc=5V no load
25
Figure 14.
5
4
3
2
Output swing vs. frequency
1
0
1M
Vcc=5V
Load=100 Ω or Load=150 Ω
10M
Frequency (Hz)
Figure 16.
Output swing vs. supply
5
100M
4
20
3
15
2
10
5
0
0,0 0,5 1,0 1,5 2,0 2,5
Vcc (V)
3,0 3,5 4,0 4,5 5,0
Figure 17.
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
1
0
3,00
Vcc=5V
F=30MHz
Load=100 Ω or 150 Ω
3,25 3,50 3,75 4,00
Vcc (V)
4,25 4,50 4,75 5,00
80
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
TSH344
Figure 19.
I bias
vs. temperature
2
3
4
5
6
Vcc=5V
Load=150 Ω
Electrical characteristics
Figure 20.
Gain matching vs. temperature
1,0
0,8
Gain Matching between 3 channels
Vcc=5V
Load=150 Ω
Vin=0.3V and 1V
0,6
0,4
0,2
7
-40 -20 0 20 40
Temperature (°C)
60
Figure 21.
Supply current vs. temperature
12
80
0,0
-40 -20 0 20 40
Temperature (°C)
60
Figure 22.
Output current vs. temperature
110
80
100
11
90
10
80
9
70
8
Vcc=5V no Load
7
-40 -20 0 20 40
Temperature (°C)
60 80
60
50
-40
Vcc=5V
Load=150 Ω
-20 0 20 40
Temperature (°C)
60 80
Figure 23.
Output higher rail vs. temperature Figure 24.
Output lower rail vs. temperature
50
4,2
45
4,1
4,0
3,9
3,8
3,7
3,6
3,5
-40
Vcc=5V
Load=150 Ω
-20 0 20 40
Temperature (°C)
60 80
40
35
30
25
20
-40
Vcc=5V
Load=150 Ω
-20 0 20 40
Temperature (°C)
60 80
9/17
Application information TSH344
3.1 Using the TSH344 to drive R-G-B 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.
TSH344 in single supply for HD video outputs
DAC
R
DAC
G
B
DAC
+5V
75
Ω
LPF
TSH344
SO8
75
Ω
75
Ω
LPF
LPF
Digital synchro 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
Cable
Cable
Cable
HDTV
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 Application information
Figure 27.
Details on one channel of the TSH344
+5V
1/3 TSH344
(gain=2)
10nF
+
100µF
75 Ω
DAC
External resistor.
Load required by the DAC output specification
470nH
68pF
STB
68pF
0V video line
TV
75 Ω
5Volt 5Volt
2V
1V
300mV
0Volt
600mV
0Volt
Low output Rail :
60mV max. tested
(see datasheet p.3: Vol)
1V
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
Ω
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
Ω
. 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
3.2
TSH344
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 (C
LF
) greater than 100 μ F is necessary to improve the PSRR in low frequencies. For better quality bypassing, a capacitor of 470nF (C
HF
) 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
+V CC
+
C
LF
C
HF
4
R
G
B
TSH344
5
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
Vcc=5V
Load=150 Ω
PSRR=20 log ( Δ VCC/ Δ Vout)
-20
-30 without capacitor
-40
-50
C
LF
=100uF
C
HF
=470nF
-60
-70
-80
10k 100k 1M
Frequency (Hz)
10M 100M
12/17
TSH344
3.3
Application information
Delay between channels
Figure 30. Measurement of the delay between each channel
5V
75
Ω
75
Ω
Cable
+6dB
75
Ω
V1
Vin
75 Ω
+6dB
75
Ω
75 Ω Cable
75 Ω
V2
75 Ω
75
Ω
Cable
+6dB
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 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 V in
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
Vcc=5V
Load=150 Ω
-4ns -2ns 0s 2ns 4ns 6ns 8ns 10ns 12ns 14ns 16ns 18ns 20ns
Time
13/17
Package information TSH344
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 Package information
Figure 32.
SO-8 package mechanical data
Dimensions
Ref.
Min.
Millimeters
Typ.
Min.
Max.
1.75
0.25
e h
L k ccc c
D
E
E1
A
A1
A2 b
0.10
1.25
0.28
0.17
4.80
5.80
3.80
0.25
0.40
1°
4.90
6.00
3.90
1.27
0.48
0.23
5.00
6.20
4.00
0.50
1.27
8°
0.10
0.004
0.049
0.011
0.007
0.189
0.228
0.150
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 TSH344
Table 4.
Order codes
Part number Temperature range
TSH344ID
TSH344IDT
-40°C to +85°C
Package
SO-8
Packing
Tube
Tape & reel
Marking
TSH344I
TSH344I
Date
Dec-2005
Jan-2006
Jul-2006
14-Mar-2007
Revision
1
2
3
4
Changes
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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