1996 Burr-Brown Corporation
PDS-1308B
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
PROGRAMMABLE GAIN AMPLIFIER
DESCRIPTION
ISO254 is a precision three-port isolated program-
mable gain instrumentation amplifier incorporating a
novel duty cycle modulation-demodulation technique
and has excellent accuracy. Internal input protection
can withstand up to
±
40V 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 results 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.
This amplifier is easy to use as no external compo-
nents are required. A power supply range of 11V to
18V makes this amplifier ideal for a wide range of
applications.
ISO254
FEATURES
G
RATED
1500Vrms Continuous
2500Vrms for One Minute
100% TESTED FOR PARTIAL DISCHARGE
G
PROGRAMMABLE GAINS OF
1, 10, 100, 1000
G
LOW NONLINEARITY:
±
0.01% typ
G
LOW INPUT BIAS CURRENT:
±
5nA max
G
LOW INPUT OFFSET VOLTAGE:
625
μ
V max
G
INPUTS PROTECTED TO
±
40V
G
BIPOLAR OPERATION: V
O
=
±
10V
G
SYNCHRONIZATION CAPABILITY
G
28-PIN PLASTIC DIP: 0.6" Wide
ISO254
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
ISO254
PGA
17
GND3
16
SYNC
15
+V
S3
1
2
A0
A1