
1996 Burr-Brown Corporation
PDS-1311B
Printed in U.S.A. April, 1996
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
Precision, Powered, Three-Port Isolated
OPERATIONAL AMPLIFIER
DESCRIPTION
ISO256 is a precision three-port isolation operational
amplifier incorporating an uncommitted operational
amplifier for input conditioning and a novel duty cycle
modulation-demodulation technique which has excel-
lent accuracy. Internal input protection can withstand
up to
±
30V input differential without damage. The
signal is transmitted digitally across a differential
capacitive barrier. With digital modulation the barrier
characteristics do not affect signal integrity. This re-
sults in excellent reliability and good high frequency
transient immunity across the barrier. The DC/DC
converter, amplifier and barrier capacitors are housed
in a plastic DIP.
A power supply range of 11V to 18V makes this
amplifier ideal for a wide range of applications.
ISO256
FEATURES
G
RATED
1500Vrms Continuous
2500Vrms for One Minute
G
100% TESTED FOR PARTIAL DISCHARGE
G
LOW NONLINEARITY:
±
0.05% typ
G
LOW INPUT BIAS CURRENT:
±
5nA max
G
INPUTS PROTECTED TO
±
30V
G
BIPOLAR OPERATION V
O
=
±
10V
G
SYNCHRONIZATION CAPABILITY
G
28-PIN PLASTIC DIP: 0.6" Wide
ISO256
APPLICATIONS
G
INDUSTRIAL PROCESS CONTROL
Transducer Isolator, Thermocouple
Isolator, RTD Isolator, Pressure Bridge
Isolator, Flow Meter Isolator
G
POWER MONITORING
G
MEDICAL INSTRUMENTATION
G
ANALYTICAL MEASUREMENTS
G
BIOMEDICAL MEASUREMENTS
G
DATA ACQUISITION
G
TEST EQUIPMENT
G
GROUND LOOP ELIMINATION
+V
S1
–V
S1
GND1
Com1
+V
IN
–V
IN
28
26
4
3
27
25
+V
S2
–V
S2
GND2
Com2
12
V
OUT
14
13
11
10
ISO256
OPA
17
GND3
16
SYNC
15
+V
S3
1
2
MOD
FB