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 150Ω and 100Ω 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 150Ω. 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
V
CC
V
in
T
oper
T
stg
T
j
R
thjc
R
thja
P
max
ESD
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
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
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.
Symbol
Operating conditions
Parameter
Value
Unit
V
CC
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
V
CC
= +5V single supply, T
amb
= 25°C (unless otherwise specified)
Parameter
Test conditions
Min.
Typ.
Max.
Unit
DC performance
V
OS
Output offset voltage
(1)
No load, T
amb
-40°C < T
amb
< +85°C
-35
-8
-8.6
5.5
6
4
1
-90
10.1
10.3
+35
mV
16
I
ib
R
in
C
in
PSRR
Input bias current
Input resistance
Input capacitance
Power supply rejection ratio
20 log (
Δ
V
CC
/
Δ
V
out
)
(2)
Supply current per buffer
T
amb
, input to GND
-40°C < T
amb
< +85°C
T
amb
T
amb
Input to GND, F=1MHz,
Δ
V
CC
=200mV
No load, input to GND
μ
A
G
Ω
pF
dB
13
mA
I
CC
G
MG1
MG0.3
-40°C < T
amb
< +85°C
DC voltage gain
R
L
= 150
Ω,
V
in
=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
V
OH
V
OL
Full power bandwidth
Delay between each channel
Slew rate
(3)
High level output voltage
Low level output voltage
Output current
I
OUT
Output short circuit current
(I
source
)
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
=0.6V, V
out
= 2Vp-p,
R
L
= 150
Ω
0 to 30MHz
V
icm
=0.6V, V
out
= 2Vp-p,
R
L
= 150
Ω
R
L
= 150
Ω
R
L
= 150
Ω
V
out
= 2Vp, T
amb
-40°C < T
amb
< +85°C
190
340
MHz
65
130
200
0.5
MHz
ns
V/
μ
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
V
CC
= +5V single supply, T
amb
= 25°C (unless otherwise specified)
Parameter
Test conditions
Min.
Typ.
Max.
Unit
F = 100kHz, R
in
= 50
Ω
eN
Total input voltage noise
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
8
55
100
-57
-42
-72
-51
nV/
√
Hz
μ
Vrms
HD2
2nd harmonic distortion
dBc
HD3
3rd harmonic distortion
dBc
1. Output offset voltage is determined by the following expression:
V
OUT
=G.
V
IN
+
V
OS
.
2. See
Figure 28
and
Figure 29.
3. Non-tested value, guaranteed by design and evaluation. See
Figure 12.
5/17
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
