Precision Lowest Cost
ISOLATION AMPLIFIER
FEATURES
q
100% TESTED FOR HIGH-VOLTAGE
BREAKDOWN
q
RATED 1500Vrms
q
HIGH IMR: 140dB at 60Hz
q
BIPOLAR OPERATION: V
O
=
10V
q
16-PIN PLASTIC DIP AND 28-LEAD SOIC
q
EASE OF USE: Fixed Unity Gain
Configuration
q
0.020% max NONLINEARITY
q
4.5V to
18V SUPPLY RANGE
APPLICATIONS
q
INDUSTRIAL PROCESS CONTROL:
Transducer Isolator, Isolator for Thermo-
couples, RTDs, Pressure Bridges, and
Flow Meters, 4mA to 20mA Loop Isolation
q
GROUND LOOP ELIMINATION
q
MOTOR AND SCR CONTROL
q
POWER MONITORING
q
PC-BASED DATA ACQUISITION
q
TEST EQUIPMENT
V
OUT
V
IN
+V
S1
ISO122
DESCRIPTION
The ISO122 is a precision isolation amplifier incor-
porating a novel duty cycle modulation-demodulation
technique. The signal is transmitted digitally across
a 2pF differential capacitive barrier. With digital modu-
lation the barrier characteristics do not affect signal
integrity, resulting in excellent reliability and good high
frequency transient immunity across the barrier. Both
barrier capacitors are imbedded in the plastic body of
the package.
The ISO122 is easy to use. No external components
are required for operation. The key specifications are
0.020% max nonlinearity, 50kHz signal bandwidth,
and 200
V/
C V
OS
drift. A power supply range of
4.5V to
18V and quiescent currents of
5.0mA on
V
S1
and
5.5mA on V
S2
make these amplifiers ideal
for a wide range of applications.
The ISO122 is available in 16-pin plastic DIP and 28-
lead plastic surface mount packages.
V
S1
Gnd
+V
S2
V
S2
Gnd
1989 Burr-Brown Corporation
PDS-857F
Printed in U.S.A. November, 1993
International Airport Industrial Park Mailing Address: PO Box 11400 Tucson, AZ 85734 Street Address: 6730 S. Tucson Blvd. Tucson, AZ 85706
Tel: (520) 746-1111 Twx: 910-952-1111 Cable: BBRCORP Telex: 066-6491 FAX: (520) 889-1510 Immediate Product Info: (800) 548-6132
SBOS160
2
ISO122
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes
no responsibility for the use of this information, and all use of such information shall be entirely at the user's own risk. Prices and specifications are subject to change
without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant
any BURR-BROWN product for use in life support devices and/or systems.
SPECIFICATIONS
At T
A
= +25
C , V
S1
= V
S2
=
15V, and R
L
= 2k
unless otherwise noted.
ISO122P/U
ISO122JP/JU
PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
ISOLATION
Voltage Rated Continuous AC 60Hz
1500
*
VAC
100% Test
(1)
1s, 5pc PD
2400
*
VAC
Isolation Mode Rejection
60Hz
140
*
dB
Barrier Impedance
10
14
|| 2
*
|| pF
Leakage Current at 60Hz
V
ISO
= 240Vrms
0.18
0.5
*
*
Arms
GAIN
V
O
=
10V
Nominal Gain
1
*
V/V
Gain Error
0.05
0.50
*
*
%FSR
Gain vs Temperature
10
*
ppm/
C
Nonlinearity
(2)
0.016
0.020
0.025
0.050
%FSR
INPUT OFFSET VOLTAGE
Initial Offset
20
50
*
*
mV
vs Temperature
200
*
V/
C
vs Supply
2
*
mV/V
Noise
4
*
V/
Hz
INPUT
Voltage Range
10
12.5
*
*
V
Resistance
200
*
k
OUTPUT
Voltage Range
10
12.5
*
*
V
Current Drive
5
15
*
*
mA
Capacitive Load Drive
0.1
*
F
Ripple Voltage
(3)
20
*
mVp-p
FREQUENCY RESPONSE
Small Signal Bandwidth
50
*
kHz
Slew Rate
2
*
V/
s
Settling Time
V
O
=
10V
0.1%
50
*
s
0.01%
350
*
s
Overload Recover Time
150
*
s
POWER SUPPLIES
Rated Voltage
15
*
V
Voltage Range
4.5
18
*
*
V
Quiescent Current: V
S1
5.0
7.0
*
*
mA
V
S2
5.5
7.0
*
*
mA
TEMPERATURE RANGE
Specification
25
+85
*
*
C
Operating
25
+85
*
*
C
Storage
40
+85
*
*
C
JA
100
*
C/W
JC
65
*
C/W
* Specification same as ISO122P/U.
NOTES: (1) Tested at 1.6 X rated, fail on 5pC partial discharge. (2) Nonlinearity is the peak deviation of the output voltage from the best-fit straight line. It is expressed
as the ratio of deviation to FSR. (3) Ripple frequency is at carrier frequency (500kHz).
3
ISO122
Top View --P Package
1
2
7
8
16
15
9
Gnd
V
IN
V
OUT
V
S1
+V
S1
10
+V
S2
Gnd
V
S2
Top View--U Package
1
2
28
27
Gnd
V
IN
V
OUT
V
S1
+V
S1
+V
S2
Gnd
V
S2
16
15
13
14
CONNECTION DIAGRAM
ABSOLUTE MAXIMUM RATINGS
Supply Voltage ...................................................................................
18V
V
IN
......................................................................................................
100V
Continuous Isolation Voltage ..................................................... 1500Vrms
Junction Temperature .................................................................... +150
C
Storage Temperature ....................................................................... +85
C
Lead Temperature (soldering, 10s) ................................................ +300
C
Output Short to Common ......................................................... Continuous
PACKAGE INFORMATION
(1)
PACKAGE DRAWING
MODEL
PACKAGE
NUMBER
ISO122P
16-Pin Plastic DIP
238
ISO122JP
16-Pin Plastic DIP
238
ISO122U
28-Pin Plastic SOIC
217-1
ISO122JU
28-Pin Plastic SOIC
217-1
NOTE: (1) For detailed drawing and dimension table, please see end of data
sheet, or Appendix D of Burr-Brown IC Data Book.
NONLINEARITY
MODEL
PACKAGE
MAX %FSR
ISO122P
Plastic DIP
0.020
ISO122JP
Plastic DIP
0.050
ISO122U
Plastic SOIC
0.020
ISO122JU
Plastic SOIC
0.050
ORDERING INFORMATION
4
ISO122
+10
0
10
0
Output Voltage (V)
500
Time (
s)
SINE RESPONSE
(f = 2kHz)
1000
Time (
s)
+10
0
10
0
Output Voltage (V)
100
50
SINE RESPONSE
(f = 20kHz)
Time (
s)
+10
0
10
0
Output Voltage (V)
STEP RESPONSE
100
50
Time (
s)
+10
0
10
0
Output Voltage (V)
STEP RESPONSE
500
1000
TYPICAL PERFORMANCE CURVES
T
A
= +25
C, V
S
=
15V unless otherwise noted.
100
0
100M
10M
ISOLATION VOLTAGE
vs FREQUENCY
Typical
Performance
Frequency (Hz)
100k
10k
Max DC Rating
1k
Peak Isolation Voltage
Degraded
Performance
100
1k
1M
2.1k
IMR vs FREQUENCY
1M
1
Frequency (Hz)
160
140
120
100
80
60
40
10
100
100k
10k
1k
IMR (dB)
5
ISO122
TYPICAL PERFORMANCE CURVES
T
A
= +25
C, V
S
=
15V unless otherwise noted.
PSRR vs FREQUENCY
60
40
20
0
Frequency (Hz)
1 10 100 1k 10k 100k 1M
54
PSRR (dB)
V
S1
, V
S2
+V
S1
, +V
S2
Frequency (Hz)
100mA
10mA
1mA
100
A
10
A
1
A
0.1
A
1 10 100 1k 10k 100k 1M
ISOLATION LEAKAGE CURRENT
vs FREQUENCY
Leakage Current (rms)
1500Vrms
240Vrms
Input Frequency
0 500kHz 1MHz 1.5MHz
0
10
20
30
40
250
200
150
100
50
V
OUT
/ V
IN
dBm
SIGNAL RESPONSE TO
INPUTS GREATER THAN 250kHz
Frequency Out
100kHz
V
OUT
/V
IN
Freq
Out
(NOTE: Shaded area shows aliasing frequencies that cannot
be removed by a low-pass filter at the output.)
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