ISO254
®
ISO
254
Precision, Powered, Three-Port Isolated
PROGRAMMABLE GAIN AMPLIFIER
FEATURES
DESCRIPTION
q RATED
1500Vrms Continuous
2500Vrms for One Minute
100% TESTED FOR PARTIAL DISCHARGE
q LOW NONLINEARITY: ±0.01% typ
q LOW INPUT BIAS CURRENT: ±5nA max
q LOW INPUT OFFSET VOLTAGE:
625µV max
q INPUTS PROTECTED TO ±40V
ISO254 is a precision three-port isolated programmable 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.
q BIPOLAR OPERATION: VO = ±10V
q SYNCHRONIZATION CAPABILITY
q 28-PIN PLASTIC DIP: 0.6" Wide
This amplifier is easy to use as no external components are required. A power supply range of 11V to
18V makes this amplifier ideal for a wide range of
applications.
q PROGRAMMABLE GAINS OF
1, 10, 100, 1000
APPLICATIONS
2
1
A1
q INDUSTRIAL PROCESS CONTROL
Transducer Isolator, Thermocouple
Isolator, RTD Isolator, Pressure Bridge
Isolator, Flow Meter Isolator
q POWER MONITORING
q MEDICAL INSTRUMENTATION
3
A0
ISO254
+VIN
VOUT
PGA
4
q ANALYTICAL MEASUREMENTS
q BIOMEDICAL MEASUREMENTS
q DATA ACQUISITION
26
28
q TEST EQUIPMENT
q GROUND LOOP ELIMINATION
27
25
14
–VIN
Com1
Com2
+VS1
+VS2
–VS2
–VS1
GND1
GND2
GND3 SYNC
17
16
13
12
11
10
+VS3
15
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
©
PDS-1308B
1996 Burr-Brown Corporation
Printed in U.S.A. April, 1996
ABSOLUTE MAXIMUM RATINGS
PIN CONFIGURATION
Supply Voltage ................................................................................... +18V
VIN, Analog Input Voltage Range ....................................................... ±40V
Com1 to GND1 .................................................................................... ±1V
Com2 to GND2 .................................................................................... ±1V
Continuous Isolation Voltage ..................................................... 1500Vrms
..................................................................................... 2500Vrms one min
IMV, dv/dt ...................................................................................... 20kV/µs
Junction Temperature ...................................................................... 150°C
Storage Temperature ........................................................ –40°C to +85°C
Lead Temperature (soldering, 10s) ................................................ +300°C
Output Short Duration .......................................... Continuous to Common
A0
1
28 +VS1
A1
2
27 –VS1
–VIN
3
26 Com1
+VIN
4
25 GND1
ELECTROSTATIC
DISCHARGE SENSITIVITY
GND2 10
+VS2 12
17 GND3
Any integrated circuit can be damaged by ESD. Burr-Brown
recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling
and installation procedures can cause damage.
Com2 13
16 SYNC
–VS2 11
VOUT 14
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits
may be more susceptible to damage because very small
parametric changes could cause the device not to meet
published specifications.
PACKAGE INFORMATION
PACKAGE
PACKAGE DRAWING
NUMBER(1)
28-Pin Plastic DIP
335
PRODUCT
ISO254P
NOTE: (1) For detailed drawing and dimension table, please see end of data
sheet, or Appendix C of Burr-Brown IC Data Book.
ORDERING INFORMATION
PRODUCT
15 +VS3
PACKAGE
ISO254P
28-Pin Plastic DIP
TYPICAL PERFORMANCE CURVES
At TA = +25°C, +VS3 = 15V, RL = 2kΩ, and 220nF capacitors on all generated supplies, unless otherwise noted.
PSRR vs FREQUENCY
(G = 10)
PSRR vs FREQUENCY
(G = 1)
60
PSRR (dB)
80
60
PSRR (dB)
80
40
40
20
20
0
0
1
10
100
1K
10K
1
100K
10
100
1k
10k
100k
Frequency (Hz)
Frequency (Hz)
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.
®
3
ISO254
