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
The AD7740 is a CMOS synchronous voltage‑to‑frequency converter that operates from a single 3.0 V‑3.6 V or 4.75 V‑5.25 V supply and consumes typically 0.9 mA. It offers a full‑scale output frequency set by an external clock up to 1 MHz and provides both buffered and unbuffered input modes, allowing true bipolar operation.
The document provides detailed specifications, timing characteristics, absolute maximum ratings, pin configurations, ordering information, and application examples such as temperature‑sensor interfacing and 32 kHz crystal operation.
| Supply Voltage Range | 3.0 V‑3.6 V, 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 bandgap |
It operates from a single 3.0 V‑3.6 V or 4.75 V‑5.25 V supply.
When the CLKIN input is inactive low for about 1 ms, the device automatically enters power‑down mode.
The typical current draw is 0.9 mA in normal mode.
The device can accept input frequencies up to 1 MHz.