FEATURES
UL Component Recognized
Provision for External Synchronization
High Linearity: 0.0050% Peak, Typical
High Input/output Isolation: 5000VDC continuous,
3000VAC RMS
1000:1 Programmable Gain
Low Drift: 0.01% /
C Maximum
126dB Common-Mode Rejection
BLOCK DIAGRAM IA175
The Model IA175 Isolation Amplifier features very high
linearity, input/output isolation, and common-mode rejection,
very low drift, and externally programmable gain. Its 0.005%
linearity assures compatibility with 12-bit data acquisition
systems, and its ability to operate at common-mode input
voltages up to 5000VDC enables operation with single
sources in high voltage systems and other hazardous
locations. Common-mode rejection is at least 120dB with
source imbalance of up to 5000 ohms. Input voltage noise is
1
V, 10HZ to 1kHz, and current noise is 10pA for the same
range. The gain of the amplifier is programmable from 1V/V to
1000V/V by means of an externally connected resistance
value. The internal oscillator used to provide modulation and
demodulation for input isolation can be synchronized with
those of associated Model IA175 amplifiers by means of an
external trigger, to avoid imposition of beat-frequency
phenomena on the output signals. An independent 14VDC,
5mA supply in the input section, with the same voltage
isolation as the amplifier input, is used to power an external
transducer, or preamplifier.
CHARACTERISTICS
(Typical, @ 25
C, Vs = +15 VDC unless otherwise noted.)
GAIN (Non-inverting)
Range
1 to 1000V/V
Formula
1 + (30k
/Rg)
Deviation from Formula
1%
Vs. Temperature (0 to + 70
C)
0.005%/
C
Vs. Temperature (0 to + 70
C)
0.01%/
C max.
Nonlinearity, 5V Output
0.01% max
Nonlinearity, 10V Output
0.02% max.
INPUT VOLTAGE RATINGS
Linear Differential Range
10V min.
Max. Safe Differential Input rms.
Continuous
125V rms.
Peak Pulse, 5ms Duration, 1 Pulse/Sec
600V
Max. CMV, Inputs to Outputs/Power Common
Peak AC, 60HZ, 1 Minute
3,000V
Peak DC Continuous
5,000V
CMR, Inputs to Outputs, 60Hz
Balanced Source Impedance
126dB
5K
Source Imbalance
120dB
CMR, Inputs to Guard, 60Hz
5K
Source Imbalance
80dB
Max. Leakage Current, Inputs to Common
115VAC, 60Hz
8
A max.
INPUT IMPEDANCE
Differential
10
8
|| 3pF
Overload
27K
Common Mode
10
11
|| 20pF
INPUT BIAS CURRENT
Initial, @ +25
C
2nA
Vs. Temperature (0 to + 70
C)
0.01nA/
C
INPUT NOISE
Voltage
0.01Hz to 10Hz
3
V p-p
10Hz to 1kHz
1
V rms.
Current
0.01Hz to 10Hz
1pA p-p
FREQUENCY RESPONSE
Small Signal, -3dB Gain = 100V/V
1kHz
Full Power, 20V p-p Output
500HZ
Slew Rate
30mV/
S
OFFSET VOLTAGE, REFERRED TO INPUT
Initial, @ +25
C
(1 + 5/G) mV
Vs. Temperature (0 to + 70
C)
Gain = 1 V/V (
V/
C max.)
35
Gain = 100V/V (
V/
C max.)
15
At other Gains (
V/
C max.)
(15 + 20/G)
Vs. Supply Voltage
(1 + 20/G),
V/V
RATED OUTPUT
Voltage, 50K
Load
10V min.
Output Ripple, 20kHz
10mV P-P
Output Impedance
1.0k
Max. CMV, Output Common to Power Common
Peak AC or DC Continuous
50V pk.
ISOLATED POWER CIRCUIT
Voltage, 15mA Load
14VDC
Accuracy
5%
Current
15mA min.
Regulation
No Load to Full Load
+0, -2%
GAIN
0.005%
Output Offset
100
V
Input Offset
5
V
POWER SUPPLY, SINGLE POLARITY
Voltage, for Rated Performance
+15VDC, 0.5V
Voltage, Operating
+12 to + 18VDC
Current, Quiescent
70mA
Current, Full Load
100mA
External Sync. Frequency
7 8KHz, 5VDC @
50% duty cycle
TEMPERATURE RANGE
Rated Performance
0
C to +70
C
Storage
-55
C to +85
C
CASE DIMENSIONS
3.5" x 2.5" x .62"
MATING SOCKET
S132
NOMINAL WEIGHT
1.3 ounces
CONNECTION NOTES:
1.
Gain adjustment resistor (Rg) is connected between GAIN and LO-IN
pins.
2.
If no output-offset adjustment is required, connect LO-OUT to
COMMON pin. Otherwise, consult factory.
IA175 ULTR-LINEAR
ISOLATION AMPLIFIER WITH
EXTERNAL SYNC CAPABILITY
Fully compatible with 12-Bit Acquisition Systems
HI IN
GAIN
ADJ
SHIELD
GUARD
LO IN
+VsOUT
-VsOUT
INNER
INPUT
SHIELD
OUTER INPUT
SHIELD
FULL-WAVE
MODU-
LATOR
MODU-
LATOR
DRIVE
DC-DC
CONVERTER
FULL-WAVE
DEMODU-
LATOR
DEMODU-
LATOR
DRIVE
OSCIL-
LATOR
FILTER
HI OUT
LO OUT
+Vs
COM
OUTPUT SHIELD
SYNC
HI IN
GAIN ADJ
SHIELD
GUARD
+Vs
LO IN
-Vs
4 - 40 N/C
2 PLACES
HI OUT
N.C.
(GAIN
ADJ
OPT)
LO OUT
COM
OUT
+15
6
5
4
3
2
1
12
11
10
8
7
9
SYNC
2.53 (64.2)
MAX.
3.53 (89.66)
MAX.
.63 (16.0)
MAX.
.20 (5.06)
MIN.
.04 (1.02)
DIA.
MODEL IA175
BOTTOM VIEW
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