FEATURES
• UL Component Recognized (IA184)
• Provision for External Synchronization
• High Linearity: 0.025% Peak, Typical
• 2500V Input/output Isolation
• 126dB Common-Mode Rejection
• 1000:1 Programmable Gain
• Small Size: only 1.5” x 1.5” x 0.63”
BLOCK DIAGRAM IA184
The Model IA184 Isolation Amplifier is an ultra-compact
module offering high linearity, 2500-Volt input/output isolation, 126dB
common-mode rejection, externally programmable gain, a floating
internal supply for powering an external transducer, and external
synchronization of the internal oscillator used in obtaining the input
isolation. Its 0.1% linearity assures compatibility with 10-bit data
acquisition systems, and input voltage noise is held to 1µV, 10Hz to
1kHz, with 10pA maximum current noise for the same range. The
internal oscillator used to provide modulation and demodulation for
input isolation can be synchronized with those of associated Model
IA184 amplifiers by an external trigger, to prevent imposition of beat-
frequency phenomena on the output signal. An independent ±15 DC,
±15mA supply in the input section, with the same voltage isolation as
the input, can be 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 Gain = (1 + 100KΩ
Rg )
Deviation from Formula ±3%
Vs. Temperature (0 to +70°C) ±0.015%/°C
Nonlinearity, G = 1V/V to 10V/V @±5V, ±0.025%
@±10V, ±0.1%
@±10V, ±0.2% max.
INPUT VOLTAGE RATINGS
Linear Differential Range, G = 1V/V 10V min.
Max. Safe Differential Input
Continuous 125V rms.
Pulse, 10ms Duration, 1 Pulse/10 Sec ±600V pk max.
Max. CMV, Inputs to Outputs
AC, 60HZ, 1 Minute Duration ±2500V rms.
Pulse, 10mS Duration, 1 Pulse/10sec ±2500V pk max.
With 510Ω in Series with Guard ±5000V pk max.
Continuos, AC or DC ±2500V pk max.
CMR, Inputs to Outputs, 60Hz, Rs<5KΩ
Balanced Source Impedance 126dB
5KΩ Source Imbalance 120dB
CMR, Inputs to Guard, 60Hz
1KΩ Source Imbalance 80dB
Max. Leakage Current, Inputs to Power
Common @115VAC, 60Hz 1.2µA rms. max.
INPUT IMPEDANCE
Differential 10
8
Ω || 3pF
Overload 27KΩ
Common Mode 5 x 10
10
Ω || 20pF
INPUT BIAS CURRENT
Initial, @ +25°C ±2nA
Vs. Temperature (0 to + 70°C) ±0.01nA/°C
INPUT NOISE
Voltage
0.05Hz to 10Hz 3µV p-p
10Hz to 1kHz 1µV rms.
Current
0.05Hz to 10Hz 5pA p-p
10Hz to 1KHz 10pA rms.
FREQUENCY RESPONSE
Small Signal, -3dB G = 1V/V to 10V/V 1kHz
Full Power, 10V p-p Output
Gain = 1V/V 500HZ
Gain = 10V/V 500Hz
Recovery Time to ±100µV after application of
±600V pk differential input ulse 50mS
OFFSET VOLTAGE, REFERRED TO INPUT
Initial, @ +25°C ±(1 + 5/G)mV
Vs. Temperature (0 to + 70°C)
Gain = 1 V/V (µV/°C max.) ± 65
Gain = 100V/V (µV/°C max.) ±15
At other Gains (µV/°C max.) ±(15 + 50/G)
Vs. Supply Voltage ±(1 + 50/G)µV/V
RATED OUTPUT
Voltage, 50KΩ Load ±10V min.
Output Impedance 1kΩ
Max. CMV, Output Common to Power Common,
Peak AC or DC Continuous ±50V pk.
ISOLATED POWER OUTPUTS
Voltage, ±5mA Load ±15VDC
Accuracy ±5%
Current ± 15mA min.
Regulation, No Load to Full Load +0, -3%
Ripple, 100kHz Bandwidth 100mV p-p
POWER SUPPLY, SINGLE POLARITY
Voltage, Rated Performance +15VDC, ±.5V
Voltage, Operating +(8 to 15.5)VDC
Current, Quiescent 20mA
Current, Full Load 50mA
External Sync. Frequency 33 to 37 kHz, 5VDC @
50% duty cycle
TEMPERATURE RANGE
Rated Performance 0 to +70°C
Storage -55°C to +85°C
CASE DIMENSIONS 1.5” x 1.5” x .62”
MATING SOCKET S134
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.
IA184 LOW-COST, HIGH-LINEARITY
ISOLATION AMPLIFIER WITH
EXTERNAL SYNC CAPABILITY
Fully compatible with 10-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
1.52
(38.61)
MAX.
.64
(16.26)
MAX.
.20 (5.08)
MIN.
.04 (1.02)
DIA.
MODEL
IA184
GAIN ADJ
SHIELD
GUARD
+Vs
LO IN
-Vs
+IN
HI OUT
LO OUT
COM
+15
6
5
4
3
2
1
11
10
8
7
9SYNC
1.52 (38.61)
MAX.
BOTTOM VIEW