ia284 low cost, high-linearity isolation amplifier

IA284 LOW COST, HIGH-LINEARITY
ISOLATION AMPLIFIER
Fully Compatible with 10-Bit Acquisition Systems
FEATURES
CHARACTERISTICS
•
Linearity: 0.025% Peak, Typical
•
2500V Input / Output Isolation
•
126dB Common-Mode Rejection
•
10:1 Programmable Gain
(Typical, @ 25°C, Vs = +15 VDC unless otherwise noted.)
GAIN (Non-inverting)
Range (50kΩ load)
Formula
Deviation from Formula
Vs. Temperature (0 to + 70°C)
Nonlinearity, G = 1V/V to 10V/V
1 to 10V/V
Gain = ( 1 +
100kΩ
10.7kΩ + Rg)
±3%
±0.015%/°C
@±5V, ±0.025%
@±10V, ±0.1%
@±10V, ±0.2% max.
The Model IA284 Isolation Amplifier is an ultracompact module offering high linearity, 2500 volt input /
output isolation, 126 dB common-mode rejection,
programmable gain, and a floating internal supply for
powering an external transducer. Its .1% linearity assures
compatibility with 10-bit data acquisition systems, and input
voltage noise is held to 1V, 10Hz to 1kHz, with 10pA
maximum current noise for the same range. An independent
±15VDC, ±15mA supply in the input section, with the same
voltage isolation as the input, can be used to power an
external transducer or preamplifier.
BLOCK DIAGRAM IA284
OUTER INPUT
SHIELD
HI IN
GAIN
ADJ
INNER
INPUT
SHIELD
SHIELD
GUARD
LO IN
+VsOUT
-VsOUT
OUTPUT SHIELD
MODULATOR
DEMODULATOR
MODULATOR
DRIVE
DEMODULATOR
DRIVE
DC-DC
CONVERTER
OSCILLATOR
FILTER
HI OUT
LO OUT
+Vs
COM
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.
1.52 (38.61)
MAX.
.63 (16.26)
MAX.
1.52 (38.61)
MAX.
MODEL IA284
.20 (5.08)
MIN.
.04 (1.02)
DIA.
1 LO IN
+15 7
12 N.C.
2 +Vs (GAD) COM 8
3 -Vs
5 +IN
9
LO OUT
HI OUT
SHIELD
10
6 GUARD
BOTTOM VIEW
INPUT VOLTAGE RATINGS
Linear Differential Range, G = 1V/V
Max. Safe Differential Input
Continuous
Pulse, 10ms Duration, 1 Pulse/10 Sec
Max. CMV, Inputs to Outputs
AC, 60HZ, 1 Minute Duration
Pulse, 10mS Duration, 1 Pulse/10 Sec
With 510kΩ in Series with Guard
Continuous, AC or DC
CMR, Inputs to Outputs, 60Hz
Balanced Source Impedance
5KΩ Source Imbalance
CMR, Inputs to Guard, 60Hz
1KΩ Source Imbalance
Max. Leakage Current, Inputs to Power
Common @ 115VAC, 60Hz
INPUT IMPEDANCE
Differential
Overload
Common Mode
INPUT DIFFERENCE CURRENT
Initial, @ +25°C
Vs. Temperature (0 to + 70°C)
INPUT NOISE
Voltage
0.05Hz to 10Hz
10Hz to 1kHz
Current
0.05Hz to 100Hz
10Hz to 1kHz
FREQUENCY RESPONSE
Small Signal, -3dB G = 1V/V to 10V/V
Full Power, 10V p-p Output
Gain = 1V/V
Gain = 10V/V
Recovery Time to ±100µV after
Application of ±600V pk differential Input Pulse
OFFSET VOLTAGE, REFERRED TO INPUT
Initial, @ +25°C
Vs. Temperature (0 to + 70°C)
Gain = 1 V/V (µV/°C max.)
Gain = 100V/V (µV/°C max.)
At other Gains (µV/°C max.)
Vs. Supply Voltage
RATED OUTPUT
Voltage, 50KΩ Load
Output Impedance
Max. CMV, Output Common to Power Common
Peak AC or DC Continuous
ISOLATED POWER OUTPUTS
Voltage, ±5mA Load
Accuracy
Current
Regulation
No Load to Full Load
Ripple, 100kHz Bandwidth
POWER SUPPLY, SINGLE POLARITY
Voltage, for Rated Performance
Voltage, Operating
Current, Quiescent
TEMPERATURE RANGE
Rated Performance
Storage
CASE DIMENSIONS
MATING SOCKET
NOMINAL WEIGHT
±10V min.
240V rms.
6,500V pk max.
2,500V rms.
±2,500V pk max.
±5,000V pk max.
±2,500V pk max.
126dB
120dB
80dB
1.2µA max.
108Ω || 3pF
390KΩ
5 X 1010Ω || 20pF
±2nA
±0.01nA/°C
8µV
10µV rms.
5pA p-p
10pA rms.
1kHz
500Hz
500Hz
500mS
±(1 + 5/G) mV
±65
±15
±(15 + 50/G)
±(1 + 50/G), µV/V
±10V min.
1kΩ
±50V pk.
±15VDC
±5%
±15mA min.
+0, -15%
100mV p-p
+15VDC, ±0.5V
+(8 to 15.5) VDC
+20mA
0°C to +70°C
-55°C to +85°C
1.5” x 1.5” x .62”
S134
1.3 ounces