The AD737 is a low power, high precision, monolithic digital True RMS converter providing a 200 mV full-scale input range (larger inputs with input attenuator), direct interfacing with 3½ digit CMOS ADCs, high input impedance (1012 Ω), low input bias current (25 pA maximum), high accuracy (±0.2 mV ± 0.3% of reading), wide power supply range (±2.5 V to ±16.5 V), and low power consumption (160 μA maximum supply current). No external trims are required for specified accuracy. A general-purpose, buffered voltage output version is also available (AD736).
The AD737 provides true RMS, average‑rectified, and absolute‑value conversion for AC and DC signals. It features a 200 mV full‑scale input range, high input impedance, and a low 25 pA input bias current, making it suitable for battery‑powered instruments such as portable multimeters.
Its supply voltage can operate from +2.5 V to +16.5 V, drawing only 160 pA standby current and 0.72 mW during operation. The device is offered in three 8‑lead packages (PDIP, SOIC_N, CERDIP) and includes a power‑down mode to further reduce standby consumption.
| Full‑scale input range | 200 mV |
|---|---|
| Supply voltage range | +2.5 V to +16.5 V |
| Power consumption (typical) | 0.72 mW |
| Standby supply current | 160 pA |
| Input impedance | 10 MΩ |
| Input bias current | 25 pA (max) |
| Input resistance | 10¹² Ω |
| Maximum supply voltage (absolute rating) | +16.5 V |
| Available packages | PDIP, SOIC_N, CERDIP (8‑lead) |
The AD737 operates from +2.5 V up to +16.5 V.
It consumes only about 0.72 mW while active.
The input bias current is limited to 25 pA maximum.
The device is available in PDIP, SOIC_N, and CERDIP 8‑lead packages.