Isolated Amplifier with Adjustable Gain and Single-Ended Output

The ADuM3195/ADuM41951 are isolation amplifiers based on Analog Devices, Inc., iCoupler® technology. The ADuM3195/ADuM4195 have very low offset and gain error, making them ideal for many isolated voltage sensing applications.

Unlike optocoupler-based solutions, which have an uncertain current transfer ratio over lifetime and at high temperatures, the ADuM3195/ ADuM4195 transfer functions do not change over lifetime, and are stable over a wide temperature range of −40°C to +125°C.

Included in the ADuM3195/ADuM4195 are wideband operational amplifiers useful for a variety of commonly used applications, and two high accuracy 2.5 V references outputs.

The ADuM3195 is packaged in a 16-lead quarter small outline package (QSOP) for a 3000 V rms isolation voltage rating according to UL1577. The ADuM4195 is packaged in a 16-lead wide-body SOIC package with increased creepage for a 5000 V rms isolation voltage rating according to UL1577.

APPLICATIONS

* Inverters

* DC to DC converters

* On-board chargers

Protected by U.S. Patents 5,952,849, 6,873,065 and 7,075,329. Other patents pending.

* High-Impedance input for isolated voltage measurement

* Low offset error and drift (output offset voltage): ±6 mV (Max) at 25°C and −22 μV/°C (Typ)

* Low gain error and drift: ±0.5% (max) and ±27 ppm/°C (max)

* Voltage-supply range

* VDD1: 4.5 V to 5.5 V

* VDD2: 4.5 V to 5.5 V

* Bandwidth: 210 kHz

* Isolation voltage

* 3000 V rms for ADuM3195

* 5000 V rms for ADuM4195

* Safety and regulatory approvals (pending)

* UL recognition (pending)

* ADuM3195: 3000 V rms for 1 minute per UL 1577

* ADuM4195: 5000 V rms for 1 minute per UL 1577