TSH321
WIDE BANDWIDTH AND MOS INPUT
SINGLE OPERATIONAL AMPLIFIER
s
s
s
s
s
s
LOW DISTORTION
GAIN BANDWIDTH PRODUCT : 300MHz
GAIN OF 2 STABILITY
SLEW RATE : 400V/µs
VERY FAST SETTLING TIME : 60ns (0.1%)
VERY HIGH INPUT IMPEDANCE
DESCRIPTION
The TSH321 is a wideband monolithic operational
amplifier, requiring a minimum close loop gain of 2
for stability.
The TSH321 features extremely high input imped-
ance (typically greater than 10
12
Ω)
allowing direct
interfacing with high impedance sources.
Low distortion, wide bandwidth and high linearity
make this amplifier suitable for RF and video ap-
plications. Short circuit protection is provided by
an internal current-limiting circuit.
The TSH321 has internal electrostatic discharge
(ESD)
protection
circuits
and
fulfills
MILSTD883C-Class2.
ORDER CODE
Part Number
D
SO8
(Plastic Micropackage)
-O
s)
so
(
b
ct
u
-O
od
(s)
r
P
ct
te
du
le
ro
o
bs
te P
O
le
so
b
O
Package
D
•
Temperature Range
-40°C, +125°C
TSH321I
D =
Small Outline Package (SO) - also available in Tape & Reel (DT)
so
b
PIN CONNECTIONS
(top view)
te
le
Offset Null 1
Inverting Input
ro
P
uc
d
s)
t(
s)
t(
c
P
te
le
1
2
3
4
V
CC
du
ro
8
6
5
Offset Null 2
7 V
CC
+
Output
N.C.
Non-inverting Input
October 2000
1/5
TSH321
SCHEMATIC DIAGRAM
7 V
CC
+
non inverting
input
3
Internal
V
ref
6
output
2
inverting
input
1
Offset N1
8
C
c
Offset N2
4
V
CC
-
INPUT OFFSET VOLTAGE NULL CIRCUIT
TSH321
-O
s)
so
(
b
ct
u
-O
od
(s)
r
P
ct
te
du
le
ro
o
bs
te P
O
le
so
b
O
N1
N2
100k
Ω
V
CC
so
b
te
le
ro
P
uc
d
s)
t(
s)
t(
c
P
te
le
du
ro
MAXIMUM RATINGS
Symbol
V
CC
V
id
V
i
I
in
Parameter
Value
±7
±5
±5
±20
-40 to +125
Unit
V
V
V
V
°C
Supply Voltage
Input Voltage
Differential Input Voltage
Current On Offset Null Pins
T
oper
Operating Free-Air Temperature range
OPERATING CONDITIONS
Symbol
V
CC
V
ic
Parameter
Value
±3 to ±6
V
CC
-
to V
CC
+
-3
Unit
V
V
Supply Voltage
Common Mode Input Voltage Range
2/5
TSH321
ELECTRICAL CHARACTERISTICS
V
CC
= ±5V, T
amb
= 25°C (unless otherwise specified)
Symbol
V
io
DV
io
I
ib
I
io
Parameter
Input Offset Voltage
T
min
.
≤
T
amb
≤
T
max
Input Offset Voltage Drift
T
min
.
≤
T
amb
≤
T
max.
Input Bias Current
.
Input Offset Current
.
Supply Current, no load
I
CC
T
min
.
≤
T
amb
≤
T
max
Avd
V
icm
V
CC
=
V
CC
=
V
CC
=
V
CC
=
±5V
±3V
±6V
±5V
800
300
200
-5 to +2
60
50
23
21
25
30
28
40
32
Min.
Typ.
0.5
Max.
10
12
Unit
mV
µV/°C
300
200
pA
pA
10
2
2
Large Signal Voltage Gain Vo = ±2.5V
R
L
=
∝
R
L
= 100Ω
R
L
= 50Ω
Input Common Mode Voltage Range
Common-mode Rejection Ratio V
ic
= V
icm min.
Output Voltage
te
le
du
ro
so
P
b
O
te
-
le
)
so
(s
b
ct
u
-O
od
(s)
r
P
ct
te
du
le
ro
o
bs
te P
O
le
so
b
O
CMR
SVR
100
70
Supply Voltage Rejection Ratio V
CC
= ±5V to ±3V
R
L
= 100Ω
±3
V
o
R
L
= 50Ω
±2.8
±2.9
±2.7
±50
+3.5
-3.7
+3.3
-3.5
T
min
.
≤
T
amb
≤
T
max
R
L
= 100Ω
R
L
= 50Ω
I
o
GBP
SR
Output Short Circuit Current Vid = ±1V, Vo = 0V
Gain Bandwidth Product
A
VCL
= 100, R
L
= 100Ω, C
L
= 15pF, f = 7.5MHz
Equivalent Input Voltage Noise
R
s
= 50Ω
±100
300
Slew Rate V
in
= ±1V, A
VCL
= 2, R
L
= 100Ω, C
L
= 15pF
200
400
e
n
f
o
= 1kHz
f
o
= 1k0Hz
f
o
= 100kHz
f
o
= 1MHz
20
18.2
18.1
18.2
15
K
ov
t
s
Overshoot V
in
= ±1V, A
VCL
= 2, R
L
= 100Ω, C
L
= 15pF
Settling Time 0.1%
1)
V
in
= ±1V, A
VCL
= -1
60
2
2
t
r
, t
f
t
d
Rise and Fall Time (see note 1)
V
in
= ±100mV, A
VCL
= 2
Delay Time (see note 1)
V
in
= ±100mV, A
VCL
= 2
φm
THD
Phase Margin A
VM
= 2, R
L
= 100Ω, C
L
= 15pF
Total Harmonic Distortion
A
VCL
= 10, f = 1kHz, V
o
= ±2.5V, no load
Full Power Bandwidth
2)
Vo = 5Vpp, R
L
= 100Ω
Vo = 2Vpp, R
L
= 100Ω
SR
-------------------
-
Π
V
opp
-5.5 to +2.5
ro
P
1300
850
650
uc
d
s)
t(
mA
V/V
s)
t(
c
V
dB
dB
V
mA
MHz
V/µs
nV/√Hz
%
ns
ns
ns
Degrees
%
45
0.02
26
64
FPB
MHz
1. See test waveform figure
2. Full power bandwidth =
3/5
TSH321
TEST WAVEFORM
EVALUATION CIRCUIT
+5V
10µF
50Ω
10nF
Input
t
s
0.1% of edge amplitude
50Ω
Output
1kΩ
10nF
90%
t
d
50%
t
r
V
in
10%
-5V
10µF
1kΩ
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 :
u
Each power supply lead has to be by-
od
(s)
r
P
ct
te
du
le
ro
o
bs
te P
O
le
so
b
O
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
c
u
-
s)
t(
b
O
so
order to decrease parasitic capacitance
and inductance.
te
le
ro
P
C
F
uc
d
s)
t(
s)
t(
c
u
Use small resistor values to decrease time
constant with parasitic capacitance.
-O
so
b
u
Choose component sizes as small as pos-
sible (SMD).
P
te
le
du
ro
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.
sistor a few pF ceramic capacitor C
F
adjust-
ed to optimize the settling time.
u
One can add in parallel with feedback re-
4/5
TSH321
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
Typ.
ro
bs
te P
O
le
so
b
O
3.8
0.4
et
ol
r
P
e
od
c
u
s)
t(
-O
so
b
te
le
Min.
0.004
0.026
0.014
0.007
0.010
0.189
0.228
ro
P
uc
d
s)
t(
s)
t(
c
Max.
0.069
0.010
0.065
0.033
0.019
0.010
0.020
0.197
0.244
Max.
1.75
0.25
1.65
0.85
0.48
0.25
0.5
5.0
6.2
uc
d
-O
s)
t(
4.0
1.27
0.6
so
b
P
te
le
du
ro
Typ.
Inches
45° (typ.)
1.27
3.81
0.150
0.016
8° (max.)
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.
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