The AD7740 is a low-cost, ultrasmall synchronous Voltage-to- Frequency Converter (VFC). It works from a single 3.0 V to 3.6 V or 4.75 V to 5.25 V supply consuming 0.9 mA. The AD7740 is available in an 8-lead SOT-23 and also in an 8-lead microSOIC package. Small package, low cost and ease of use were major design goals for this product. The part contains an on-chip 2.5 V bandgap reference but the user may overdrive this using an external voltage.
The AD7740 is a low‑cost, ultra‑small synchronous Voltage‑to‑Frequency Converter (VFC) offered in 8‑lead SOT‑23 and microSOIC packages. It operates from a single 3.0‑3.6 V or 4.75‑5.25 V supply, consumes about 0.9 mA in normal mode, and includes an on‑chip 2.5 V bandgap reference.
The document provides full electrical specifications, timing characteristics, pin descriptions, ordering information, and example applications such as temperature‑sensor interfacing and 32 kHz crystal operation. It also explains power‑down behavior and the device’s temperature‑range options (Y‑grade automotive, K‑grade commercial).
| Supply Voltage Range | 3.0 V‑3.6 V or 4.75 V‑5.25 V |
|---|---|
| Typical Power Consumption (Normal Mode) | 0.9 mA |
| Maximum Input Frequency | 1 MHz |
| Internal Reference Voltage | 2.5 V |
| Output High Voltage (VOW) | 4.0 V (5 V supply) |
| Output Low Voltage (VOR) | 0.1 V‑0.4 V |
| Power‑Down Current | 100 pA |
It can be powered from 3.0 V‑3.6 V or from 4.75 V‑5.25 V supplies.
The AD7740 typically draws about 0.9 mA in normal mode.