ST TSH340 User Manual
TSH340
320MHz Single Supply Video Buffer with Low In/Out Rail
■ Bandwidth: 320MHz
■ Single supply operation down to 3V
■ Low input & output rail
■ Very low harmonic distortion
■ Slew rate: 780V/µs
■ Voltage input noise: 7nV/√Hz
■ Specified for 150Ω and 100Ω loads
■ Internal gain of 6dB
■ Compatible with the PCB layout of a single
op-amp
■ Tested on 5V power supply
■ Data min. and max. are tested during
production
Description
The TSH340 is a single supply video buffer
featuring an internal gain of 6dB and a large
bandwidth of 320MHz for only 9.8mA of quiescent
current.
An advantage of this circuit is its input and output
negative rail feature, which is very close to GND in
single supply. This rail is teste d and guaranteed
during production at 60mV maximum from GND
on a 150Ω load. This al lows a good o utput swing
which fits perfectly when driving a v ideo sign al on
a 75Ω video line. Chapter 5 of this datasheet
gives technical support when using the TSH340
as a driver for video DAC output on a video line. In
particular, this chapter focuses on applying a
video signal DC shift to avoid any clamping of the
synchronization tip.
Pin Connections (top view)
OUT
OUT
NC
NC
NC
NC
IN
IN
GND
GND
GND
GND
1
1
2
2
3
3
4
4
1
1
2
2
3
3
SOT23-5
SOT23-5
SO8
SO8
5
5
4
4
+VCC
+VCC
NCIN
NCIN
8
8
7
7
6NCOUT
6NCOUT
5
5
NC
NC
+Vcc
+Vcc
Applications
■ High-end video systems
■ High Definition TV (HDTV)
■ Broadcast and graphic video
■ Multimedia products
The TSH340 is available in tiny SOT23-5 and
SO8 plastic packages.
Order Codes
Part Number Temperature Range Package Packaging Marking
TSH340ILT
TSH340ID
TSH340IDT Tape & Reel TSH340I
April 2005 Revision 2 1/13
-40°C to +85°C
SOT23-5 Tape & Reel K306
SO-8
Tube TSH340I
TSH340 Absolute Maximum Ratings
1 Absolute Maximum Ratings
Table 1. Key parameters and their absolute maximum ratings
Symbol Parameter Value Unit
V
T
T
Supply voltage
CC
V
Input Voltage Range
in
Operating Free Air Temperature Range
oper
Storage Temperature
std
T
Maximum Junction Temperature
j
Thermal Resistance Junction to Case
R
thjc
SOT23-5
SO8
Thermal Resistance Junction to Ambient Area
R
thja
SOT23-5
SO8
Maximum Power Dissipation (@Ta=25°C) for Tj=150°C
P
max.
SOT23-5
SO8
CDM: Charged Device Model
ESD
HBM: Human Body Model
MM: Machine Model
1) All voltage values, except differential voltage, are with respect to network terminal.
2) The magnitude of input and output voltage must never exceed VCC +0.3V.
1
2
6V
-0.2 to +3 V
-40 to +85 °C
-65 to +150 ° C
150 °C
80
°C/W
75
250
°C/W
175
500
mW
715
2
1.5
200
kV
kV
V
Table 2. Operating conditions
Symbol Parameter Value Unit
V
Power Supply Voltage
CC
Vicm Common Mode Input Voltage -0.4 to 3 V
1) Tested in full production at 0V/5V single power supply
3 to 5.5
1
V
2/13
Electrical Characteristics TSH340
2 Electrical Characteristics
Table 3. V
= +5V, T
CC
= 25°C (unless otherwise specified)
amb
Symbol Parameter Test Condition Min. Typ. Max. Unit
DC Performance
out
1
)
V
OS
I
ib
PSR
ICC
Output Offset Voltage
Input Bias Current T
Power Supply Rejection Ratio
20 log (∆V
/∆V
cc
Total Supply Current no Load, Vin=100mV
G DC Voltage Gain R
Input Resistance T
Rin
Input Capacitance T
Cin
no Load, T
-40°C < T
, V
amb
-40°C < T
=200mVp-p, F=1MHz
∆V
cc
icm
amb
< +85°C
amb
=0.6V
< +85°C
amb
-30 -5 +30
-6.8
616
7.2
-90 dB
9.8 12.8 mA
L = 150Ω 1.95 2 2.05 V/V
amb
amb
8MΩ
3.2 pF
Dynamic Performance and Output Characteristics
Bw
FPBW
SR
V
OH
V
OL
I
OUT
-3dB Bandwidth Small Signal V
=0.6V, RL = 150Ω
V
icm
Gain Flatness @ 0.1dB Small Signal V
=0.6V, RL = 150Ω
V
icm
Full Power Bandwidth V
icm
R
= 150Ω
L
=0.6V, V
Slew Rate Vicm=0.6V, V
= 150Ω
R
L
High Level Output Voltage RL = 150Ω
Low Level Output Voltage RL = 150Ω
Output Short Circuit Current (Isource) T
amb
-40°C < T
Output Current Vout=2Vp, T
OUT
OUT
< +85°C
amb
amb
out=20mVp
out=20mVp
= 2Vp-p,
= 2Vp-p,
190 320
MHz
63
130 200 MHz
780 V/µs
3.7 3.9 V
40 60 mV
100
90
45 87 mA
Noise and Distortion
eN Equivalent Input Noise Voltage F = 100kHz 7 nV/√Hz
iN Equivalent Input Noise Current F = 100kHz 1.5 pA/√Hz
HD2
HD3
1) Output Offset Voltage is determined from the following expression: V
2nd Harmonic Distortion V
3rd Harmonic Distortion V
= 2Vp-p, RL = 150Ω
OUT
F= 10MHz,
= 1Vp-p, RL = 150Ω
OUT
F= 10MHz,
=G.VIN+V
OUT
-85 dBc
-75 dBc
OS
mV
µA
mA
3/13
TSH340 Electrical Characteristics
M
Figure 1. Frequency response
16
14
12
10
8
6
4
2
0
-2
Gain (d B)
-4
-6
-8
-10
Vcc=5V
-12
Load=100 or 150
-14
SO8 and SOT23-5
-16
1M 10M 100M
Ω
Frequency (Hz)
Figure 2. Gain flatness - SOT23-5
7,0
6,8
6,6
6,4
6,2
6,0
5,8
Gain (dB)
5,6
5,4
5,2
Vcc=5V
5,0
1M 10M 100M
Load=150Ω
Load=100Ω
Frequency (Hz)
Figure 4. Frequency response on capa-load
20
C=10pF
10
0
Riso=22
C=22pF
Riso=22
Ω
C=1pF
Riso=0
Ω
C=47pF
-10
Frequency Response (dB)
Vcc=5V
Load=Riso + C//1k
-20
1M 10M 100M
Ω (to ground)
Riso=15Ω
C=0
Riso=0
Frequency (Hz)
Figure 5. Gain flatness - SO8
7,0
6,8
6,6
6,4
6,2
6,0
5,8
Gain (dB)
5,6
5,4
5,2
Vcc=5V
5,0
1M 10M 100M
Load=150Ω
Load=100Ω
Frequency (Hz)
Figure 3. T otal input noise vs. frequency
non-inverting input in short-circuit
Vcc=5V
100
Input Noise (nV/VHz)
10
100 1k 10k 100k 1M 10
Frequency (Hz)
4/13
Figure 6. Positive and negative slew rate
3,0
Vcc=5V
2,5
Load=100Ω or 150Ω
2,0
SR+
1,5
1,0
Output Response (V)
0,5
0,0
-5ns -4ns -3ns -2ns -1ns 0s 1ns 2ns 3ns 4ns 5ns
SR-
Time (ns)
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