The ISO122 is a precision isolation amplifier incorporating a novel duty cycle modulation-demodulation technique. The signal is transmitted digitally across a 2-pF differential capacitive barrier. With digital modulation the barrier characteristics do not affect signal integrity, thus resulting in excellent reliability and good high-frequency transient immunity across the barrier. Both barrier capacitors are imbedded in the plastic body of the package.
The ISO122 is easy to use. No external components are required for operation. The key specifications are 0.020% maximum nonlinearity, 50-kHz signal bandwidth, and 200-V/°C VOS drift. A power supply range of 4.5 V to 18 V and quiescent currents of 5 mA on VS1 and ±5.5 mA on VS2 make the ISO122 ideal for a wide range of applications.
The ISO122 is available in 16-pin plastic DIP and
28-lead plastic surface-mount packages.
PART NUMBER | PACKAGE | BODY SIZE (NOM) |
---|---|---|
ISO122 | PDIP (16) | 17.90 mm × 7.50 mm |
SOIC (28) | 20.01 mm × 6.61 mm |
Changes from * Revision (November1993) to A Revision
PIN | I/O | DESCRIPTION | ||
---|---|---|---|---|
NAME | PDIP | SOIC | ||
GND | 8 | 14 | - | Low-side ground reference |
GND | 16 | 28 | - | High-side ground reference |
VIN | 15 | 27 | I | High-side analog input |
VOUT | 7 | 13 | O | Low-side analog output |
+VS1 | 1 | 1 | - | High-side positive analog supply |
-VS1 | 2 | 2 | - | High-side negative analog supply |
+VS2 | 9 | 15 | - | Low-side positive analog supply |
-VS2 | 10 | 16 | - | Low-side negative analog supply |
MIN | MAX | UNIT | |
---|---|---|---|
Supply voltage | ±18 | V | |
VIN | 100 | V | |
Continuous isolation voltage | 1500 | Vrms | |
Junction temperature | 150 | °C | |
Output short to common | Continuous | ||
Storage temperature, Tstg | –40 | 125 | °C |
VALUE | UNIT | |||
---|---|---|---|---|
V(ESD) | Electrostatic discharge | Human body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) | ±1000 | V |
Charged-device model (CDM), per JEDEC specification JESD22-C101(2) | ±500 |
MIN | NOM | MAX | UNIT | ||
---|---|---|---|---|---|
TA | –25 | 85 | °C | ||
+VS1 | 15 | ||||
-VS1 | –15 | ||||
+VS2 | 15 | ||||
-VS2 | –15 | ||||
VIN | ±10 |
THERMAL METRIC(1) | ISO122 | UNIT | ||
---|---|---|---|---|
NVF (PDIP) | DVA (SOIC) | |||
16 PINS | 28 PINS | |||
RθJA | Junction-to-ambient thermal resistance | 51.0 | 79.8 | °C/W |
RθJC(top) | Junction-to-case (top) thermal resistance | 32.4 | 32.9 | |
RθJB | Junction-to-board thermal resistance | 29.5 | 42.2 | |
ψJT | Junction-to-top characterization parameter | 10.4 | 6.6 | |
ψJB | Junction-to-board characterization parameter | 29.0 | 40.9 |
PARAMETER | TEST CONDITIONS | ISO122P/U | ISO122JP/JU | UNIT | |||||
---|---|---|---|---|---|---|---|---|---|
MIN | TYP | MAX | MIN | TYP | MAX | ||||
ISOLATION | |||||||||
Voltage rated continuous ac 60Hz | 1500 | 1500 | Vac | ||||||
100% Test(1) | 1s, 5pc PD | 2400 | 2400 | Vac | |||||
Isolation Mode Rejection | 60Hz | 140 | 140 | dB | |||||
Barrier Impedance | 1014 || 2 | 1014 || 2 | Ω || pF | ||||||
Leakage Current at 60Hz | VISO = 240Vrms | 0.18 | 0.5 | 0.18 | 0.5 | µArms | |||
GAIN | |||||||||
Nominal Gain | VO = ±10V | 1 | 1 | V/V | |||||
Gain Error | ±0.05 | ±0.50 | ±0.05 | ±0.50 | %FSR | ||||
Gain vs Temperature | ±10 | ±10 | ppm/°C | ||||||
Nonlinearity(2) | ±0.016 | ±0.020 | ±0.025 | ±0.050 | %FSR | ||||
INPUT OFFSET VOLTAGE | |||||||||
Initial Offset | ±20 | ±50 | ±20 | ±50 | mV | ||||
vs Temperature | ±200 | ±200 | µV/°C | ||||||
vs Supply | ±2 | ±2 | mV/V | ||||||
Noise | 4 | µV/√Hz | |||||||
INPUT | |||||||||
Voltage Range | ±10 | ±12.5 | ±10 | ±12.5 | V | ||||
Resistance | 200 | 200 | kΩ | ||||||
OUTPUT | |||||||||
Voltage Range | ±10 | ±12.5 | ±10 | ±12.5 | V | ||||
Current Drive | ±5 | ±15 | ±5 | ±15 | mA | ||||
Capacitive Load Drive | 0.1 | 0.1 | µF | ||||||
Ripple Voltage(3) | 20 | 20 | mVp-p | ||||||
FREQUENCY RESPONSE | |||||||||
Small-Signal Bandwidth | 50 | 50 | kHz | ||||||
Slew Rate | 2 | 2 | V/µs | ||||||
Settling Time 0.10% | VO = ±10V | 50 | 50 | µs | |||||
Settling Time 0.01% | 350 | 350 | µs | ||||||
Overload Recovery Time | 150 | 150 | µs | ||||||
POWER SUPPLIES | |||||||||
Rated Voltage | ±15 | ±15 | V | ||||||
Voltage Range | ±4.5 | ±18 | ±4.5 | ±18 | V | ||||
VS1 | Quiescent Current | ±5 | ±7 | ±5 | ±7 | mA | |||
VS2 | ±5.5 | ±7 | ±5.5 | ±7 | |||||
TEMPERATURE RANGE | |||||||||
Specification | –25 | 85 | –25 | 85 | °C | ||||
Operating | –25 | 85 | –25 | 85 | °C | ||||
Storage | –40 | 125 | –40 | 125 | °C | ||||
θJA | Thermal Resistance | 100 | 100 | °C/W | |||||
θJC | 65 | 65 | °C/W |
f = 2kHz | ||
NOTE: Shaded area shows aliasing frequencies that cannot be removed by a low-pass filter at the output. | ||||
f = 20kHz | ||