ISO122
Precision Lowest Cost
ISOLATION AMPLIFIER
FEATURES
q
100% TESTED FOR HIGH-VOLTAGE
BREAKDOWN
q
q
q
q
q
RATED 1500Vrms
HIGH IMR: 140dB at 60Hz
BIPOLAR OPERATION: V
O
=
±
10V
16-PIN PLASTIC DIP AND 28-LEAD SOIC
EASE OF USE: Fixed Unity Gain
Configuration
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
q
0.020% max NONLINEARITY
q
±
4.5V to
±
18V SUPPLY RANGE
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 200µV/°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
V
IN
V
OUT
–V
S2
Gnd
+V
S2
–V
S1
Gnd
International Airport Industrial Park • Mailing Address: PO Box 11400
Tel: (520) 746-1111 • Twx: 910-952-1111 • Cable: BBRCORP •
©
• Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd. • Tucson, AZ 85706
Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
1989 Burr-Brown Corporation
PDS-857F
Printed in U.S.A. November, 1993
SPECIFICATIONS
At T
A
= +25°C , V
S1
= V
S2
=
±15V,
and R
L
= 2kΩ unless otherwise noted.
ISO122P/U
PARAMETER
ISOLATION
Voltage Rated Continuous AC 60Hz
100% Test
(1)
Isolation Mode Rejection
Barrier Impedance
Leakage Current at 60Hz
GAIN
Nominal Gain
Gain Error
Gain vs Temperature
Nonlinearity
(2)
INPUT OFFSET VOLTAGE
Initial Offset
vs Temperature
vs Supply
Noise
INPUT
Voltage Range
Resistance
OUTPUT
Voltage Range
Current Drive
Capacitive Load Drive
Ripple Voltage
(3)
FREQUENCY RESPONSE
Small Signal Bandwidth
Slew Rate
Settling Time
0.1%
0.01%
Overload Recover Time
POWER SUPPLIES
Rated Voltage
Voltage Range
Quiescent Current: V
S1
V
S2
TEMPERATURE RANGE
Specification
Operating
Storage
θ
JA
θ
JC
±10
CONDITIONS
MIN
1500
2400
140
10
14
|| 2
0.18
1
±0.05
±10
±0.016
TYP
MAX
MIN
*
*
*
*
*
*
*
*
±0.025
ISO122JP/JU
TYP
MAX
UNITS
VAC
VAC
dB
Ω
|| pF
µArms
V/V
%FSR
ppm/°C
%FSR
1s, 5pc PD
60Hz
V
ISO
= 240Vrms
V
O
=
±10V
0.5
*
±0.50
±0.020
*
±0.050
±20
±200
±2
4
±12.5
200
±12.5
±15
0.1
20
50
2
V
O
=
±10V
50
350
150
±15
±5.0
±5.5
±50
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
mV
µV/°C
mV/V
µV/√Hz
V
kΩ
V
mA
µF
mVp-p
kHz
V/µs
µs
µs
µs
V
V
mA
mA
°C
°C
°C
°C/W
°C/W
±10
±5
*
*
±4.5
±18
±7.0
±7.0
+85
+85
+85
*
*
*
*
*
*
*
*
*
*
*
*
*
*
–25
–25
–40
100
65
* 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).
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.
®
ISO122
2
CONNECTION DIAGRAM
Top View —P Package
Top View—U Package
+V
S1
1
–V
S1
2
16 Gnd
15 V
IN
+V
S1
1
–V
S1
2
28 Gnd
27 V
IN
V
OUT
Gnd
7
8
10 –V
S2
9
+V
S2
V
OUT
13
Gnd 14
16 –V
S2
15 +V
S2
PACKAGE INFORMATION
(1)
MODEL
ISO122P
ISO122JP
ISO122U
ISO122JU
PACKAGE
16-Pin Plastic DIP
16-Pin Plastic DIP
28-Pin Plastic SOIC
28-Pin Plastic SOIC
PACKAGE DRAWING
NUMBER
238
238
217-1
217-1
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
NOTE: (1) For detailed drawing and dimension table, please see end of data
sheet, or Appendix D of Burr-Brown IC Data Book.
ORDERING INFORMATION
NONLINEARITY
MAX %FSR
±0.020
±0.050
±0.020
±0.050
MODEL
ISO122P
ISO122JP
ISO122U
ISO122JU
PACKAGE
Plastic DIP
Plastic DIP
Plastic SOIC
Plastic SOIC
®
3
ISO122
TYPICAL PERFORMANCE CURVES
T
A
= +25°C, V
S
=
±15V
unless otherwise noted.
SINE RESPONSE
(f = 2kHz)
SINE RESPONSE
(f = 20kHz)
+10
+10
Output Voltage (V)
Output Voltage (V)
0
0
–10
–10
0
500
Time (µs)
1000
0
50
Time (µs)
100
STEP RESPONSE
STEP RESPONSE
Output Voltage (V)
+10
Output Voltage (V)
+10
0
0
–10
–10
0
500
Time (µs)
1000
0
50
Time (µs)
100
ISOLATION VOLTAGE
vs FREQUENCY
IMR vs FREQUENCY
160
Max DC Rating
2.1k
Peak Isolation Voltage
IMR (dB)
140
120
Degraded
Performance
1k
100
80
100
Typical
Performance
0
100
1k
10k
100k
1M
10M
100M
60
40
1
10
100
1k
10k
100k
1M
Frequency (Hz)
Frequency (Hz)
®
ISO122
4
TYPICAL PERFORMANCE CURVES
T
A
= +25°C, V
S
=
±15V
unless otherwise noted.
PSRR vs FREQUENCY
60
54
100mA
10mA
ISOLATION LEAKAGE CURRENT
vs FREQUENCY
PSRR (dB)
40
+V
S1
, +V
S2
–V
S1
, –V
S2
20
Leakage Current (rms)
1mA
1500Vrms
100µA
10µA
240Vrms
1µA
0
1
10
100
1k
10k
100k
1M
Frequency (Hz)
0.1µA
1
10
100
1k
Frequency (Hz)
10k
100k
1M
SIGNAL RESPONSE TO
INPUTS GREATER THAN 250kHz
V
OUT
/V
IN
0
V
OUT
/ V
IN
dBm
100kHz
Freq
Out
250
200
150
100
50
–10
–20
–30
–40
0
500kHz
1MHz
1.5MHz
Input Frequency
(NOTE: Shaded area shows aliasing frequencies that cannot
be removed by a low-pass filter at the output.)
Frequency Out
®
5
ISO122
