ISO256
®
ISO
256
Precision, Powered, Three-Port Isolated
OPERATIONAL AMPLIFIER
FEATURES
DESCRIPTION
q RATED
1500Vrms Continuous
2500Vrms for One Minute
q 100% TESTED FOR PARTIAL DISCHARGE
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 excellent 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 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 LOW NONLINEARITY: ±0.05% typ
q LOW INPUT BIAS CURRENT: ±5nA max
q INPUTS PROTECTED TO ±30V
q BIPOLAR OPERATION VO = ±10V
q SYNCHRONIZATION CAPABILITY
q 28-PIN PLASTIC DIP: 0.6" Wide
APPLICATIONS
q INDUSTRIAL PROCESS CONTROL
Transducer Isolator, Thermocouple
Isolator, RTD Isolator, Pressure Bridge
Isolator, Flow Meter Isolator
q POWER MONITORING
q MEDICAL INSTRUMENTATION
A power supply range of 11V to 18V makes this
amplifier ideal for a wide range of applications.
2
FB
3
q ANALYTICAL MEASUREMENTS
q BIOMEDICAL MEASUREMENTS
q DATA ACQUISITION
1
MOD
ISO256
–VIN
VOUT
OPA
4
q TEST EQUIPMENT
q GROUND LOOP ELIMINATION
26
28
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-1311B
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
MOD
28 +VS1
FB
2
27 –VS1
–VIN
3
26 Com1
+VIN
4
25 GND1
GND2 10
ELECTROSTATIC
DISCHARGE SENSITIVITY
–VS2 11
+VS2 12
17 GND3
Com2 13
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.
16 SYNC
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.
15 +VS3
PACKAGE INFORMATION
ISO256P
PACKAGE
PACKAGE DRAWING
NUMBER(1)
28-Pin Plastic DIP
PRODUCT
335
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
1
PACKAGE
ISO256P
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
ISO256
