ISC300 Datasheet, PDF (1/11 Pages) Burr-Brown (TI) – Universal Precision Isolated MEASUREMENT CHANNEL

®
ISC300
Universal Precision Isolated
MEASUREMENT CHANNEL
FEATURES
q CALIBRATION CAPABILITY
q INTEGRAL SENSOR EXCITATION
q OPEN CIRCUIT SENSOR DETECTION
q LOW POWER: 80mW
q INSTRUMENT AMPLIFIER INPUT
q PROGRAMMABLE GAIN
q 12-BIT LINEARITY
q TWO ISOLATED POWER SUPPLIES:
±13V at 5mA
q LOW DRIFT 10V REFERENCE
APPLICATIONS
q UNIVERSAL INPUT CHANNEL FOR
PROCESS CONTROL SYSTEMS
q ISOLATED MEASUREMENT CHANNEL
FOR THERMOCOUPLE, RTD AND
VOLTAGE TRANSDUCERS
q CHANNEL TO CHANNEL ISOLATED
MULTIPLEXED SYSTEMS
q ISOLATED 4 TO 20mA RECEIVER
DESCRIPTION
The ISC300 is an isolated measurement channel with
open circuit sensor detection for use with RTD and
thermocouple temperature sensors. In addition to tem-
perature measurement, the ISC300 can accept full
scale input voltages of ±100mV and ±10V which
allows use with other sensors such as pressure, humid-
ity and flow sensors. The low level resistance mea-
surement capability also allows stimulus and measure-
9 +V_ISO
2 –V_ISO
8 Sense 2
5
+I_P
6
–I_P
3 Sense 1
1
V_REF
4
I_REF1
7
I_REF2
10 Com 1
20M
+V_ISO
Filter
Channel 1 Out
20M
–V_ISO
Ref
10.0V
MUX
Channel 2
99R
0.100V
Channel 3
Current
Reference
–V_ISO
R
Com 1
Channel 4
A₁
A₀
PGA
Input Side
ment of strain gauges. The measurement channel has
a highly stable internal reference which can be se-
lected from the output side. This allows the user to
calibrate each channel at the factory, record the cali-
bration data and periodically recalibrate the system
while in use over time and ambient temperature
changes.
Barrier
Modulate
Demod
Rectify
Power
Com 1
O
P
T
O
Com 2
C
O
U
P
L
E
L
A
T
C
H
Output Side
INPUT
SELECT A₁ A₀
Com₁
+0.1V
Out
28 +10V
Signal
0
0
0
1
1
0
1
1
V_CC (+15) 25
CKI
26
Com 2 27
V_DD (+5) 18
CLK
22
G
19
A₀
20
A₁
21
RST
23
DCom 2 24
GAIN
SELECT G
0.5
0
50
1
SELECT
and GAIN
No Change
No Change
Latch
RESET
RST CLK
1
0
1
1
1
^
0
X
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Tel: [phone] • Twx: 910-952-1111 • Cable: BBRCORP • Telex: 066-6491 • FAX: [phone] • Immediate Product Info: [phone]
©_{1991 Burr-Brown Corporation}
PDS-1135A
Printed in U.S.A. October, 1993