TSH31
280MHz BANDWIDTH MOS INPUT
SINGLE OPERATIONAL AMPLIFIER
s
VERY LOW INPUT CURRENT : 2pA typ
s
GAIN BANDWIDTH PRODUCT : 280MHz
s
GAIN OF 2 STABILITY
s
SLEW RATE : 300V/µs
s
STANDARD PIN OUT
DESCRIPTION
The TSH31 is a low cost wide bandwidth single
operational amplifier featuring extremely low input
current of 2pA typ.
Other features as high slew rate, fast settling time
and high linearity make it suitable for many appli-
cations requiring speed and very high input im-
pedance as photo cell amplifier, Fet probe, high
speed precision integrator, sample and hold cir-
cuit.
ORDER CODE
Package
Part Number
TSH31I
Temperature Range
D
-40°C, +125°C
•
D
SO8
(Plastic Micropackage)
PIN CONNECTIONS
(top view)
Offset Null 1
Inverting Input
Non-inverting Input
V
CC
1
2
3
4
8
Offset Null 2
7 V
CC
+
6
5
Output
N.C.
D =
Small Outline Package (SO) - also available in Tape & Reel (DT)
October 2000
1/5
TSH31
SCHEMATIC DIAGRAM
7 V
CC
+
noninverting
input
3
Internal
V
ref
6
output
C
c
2
inverting
input
1
Offset N1
8
Offset N2
4
V
CC
-
INPUT OFFSET VOLTAGE NULL CIRCUIT
TSH31
N1
N2
100k
W
V
CC
MAXIMUM RATINGS
Symbol
V
CC
V
id
V
i
I
in
T
oper
Supply Voltage
Differential Input Voltage
Input Voltage
Current On Offset Null Pins
Operating Free-Air Temperature range
Parameter
Value
±7
±5
±5
±20
-40 to +125
Unit
V
V
V
V
°C
OPERATING CONDITIONS
Symbol
V
CC
V
ic
Supply Voltage
Common Mode Input Voltage Range
Parameter
Value
±3 to ±6
V
CC
-
to V
CC
+
-3
Unit
V
V
2/5
TSH31
ELECTRICAL CHARACTERISTICS
V
CC
= ±5V, T
amb
= 25°C (unless otherwise specified)
Symbol
V
io
DV
io
I
ib
I
io
I
CC
Avd
V
icm
CMR
SVR
V
o
I
o
GBP
SR
e
n
φm
Input Offset Voltage
Input Offset Voltage Drift
T
min
.
≤
T
amb
≤
T
max.
Input Bias Current
.
Input Offset Current
.
Supply Current, no load
Large Signal Voltage Gain
Vo = ±2.5V
Input Common Mode Voltage Range
Common-mode Rejection Ratio
V
ic
= V
icm min.
Supply Voltage Rejection Ratio
V
CC
= ±5V to ±3V
Output Voltage
R
L
= 100Ω
V
CC
= ±5V
R
L
= 100Ω
200
-5 to +2
55
45
±2.5
Parameter
Min.
Typ.
3
20
2
2
20
800
-5.5 to +2.5
95
65
+3.5
-3.7
±70
280
300
20
40
300
200
40
Max.
15
Unit
mV
µV/°C
pA
pA
mA
V/V
V
dB
dB
V
mA
MHz
V/µs
nV/√Hz
Degrees
Output Short Circuit Current
Vid = ±1V, Vo = 0V
Gain Bandwidth Product
A
VCL
= 100, R
L
= 100Ω, f = 7.5MHz
Slew Rate
V
in
= ±2V, A
VCL
= 1, R
L
= 100Ω
Equivalent Input Voltage Noise
f = 1MHz
Phase Margin
A
VM
= 1, R
L
= 100Ω, C
L
= 15pF
3/5
TSH31
EVALUATION CIRCUIT
+5V
10m F
50W
Input
1kW
10nF
10nF
50W
Output
-5V
10m F
1kW
C
F
PRINTED CIRCUIT LAYOUT
As for any high frequency device, a few rules must
be observed when designing the PCB to get the
best performances from this high speed op amp.
From the most to the least important points :
order to decrease parasitic capacitance
and inductance.
u
Use small resistor values to decrease time
constant with parasitic capacitance.
u
Choose component sizes as small as pos-
sible (SMD).
u
On output, decrease capacitor load so as
to avoid circuit stability being degraded
which may cause oscillation. You can also
add a serial resistor in order to minimise its
influence.
u
One can add in parallel with feedback re-
sistor a few pF ceramic capacitor C
F
adjust-
ed to optimize the settling time.
u
Each power supply lead has to be by-
passed to ground with a 10nF ceramic ca-
pacitor very close to the device and a 10µF
tantalum capacitor.
u
To provide low inductance and low resist-
ance common return, use a ground plane
or common point return for power and sig-
nal.
u
All leads must be wide and as short as pos-
sible especially for op amp inputs. This is in
4/5
TSH31
PACKAGE MECHANICAL DATA
8 PINS - PLASTIC MICROPACKAGE (SO)
Millimeters
Dim.
Min.
A
a1
a2
a3
b
b1
C
c1
D
E
e
e3
F
L
M
S
0.1
0.65
0.35
0.19
0.25
4.8
5.8
1.27
3.81
3.8
0.4
4.0
1.27
0.6
8° (max.)
0.150
0.016
Typ.
Max.
1.75
0.25
1.65
0.85
0.48
0.25
0.5
45° (typ.)
5.0
6.2
0.189
0.228
Min.
0.004
0.026
0.014
0.007
0.010
Inches
Typ.
Max.
0.069
0.010
0.065
0.033
0.019
0.010
0.020
0.197
0.244
0.050
0.150
0.157
0.050
0.024
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may result
from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics.
Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all
information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support
devices or systems without express written approval of STMicroelectronics.
© The ST logo is a registered trademark of STMicroelectronics
© 2000 STMicroelectronics - Printed in Italy - All Rights Reserved
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5/5
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