The AD7741/AD7742 are single-channel and multichannel synchronous voltage-to-frequency converters, respectively, which feature an on-chip +2.5 V reference and an external reference option. They offer low input noise, high conversion accuracy, and low distortion.
The AD7741 and AD7742 are synchronous voltage‑to‑frequency converters (VFCs) that operate from a single +5 V supply. The AD7741 provides one single‑ended input channel, while the AD7742 offers two differential or three pseudo‑differential input channels and four buffered inputs. Both devices include an on‑chip +2.5 V reference and support internal or external reference options.
The document contains detailed specifications, pin‑function descriptions, timing diagrams, application notes for isolated signal transmission, and guidelines for power‑supply bypassing and grounding to achieve optimal accuracy.
| Supply voltage range | +4.75 V to +5.25 V |
|---|---|
| Normal‑mode supply current | 8 mA (typ) |
| Power‑down current | 35 pA (max) |
| Input channels (AD7741) | One single‑ended input channel |
| Input channels (AD7742) | Two differential or three pseudo‑differential input channels |
| Integral nonlinearity | 0.012 % of span (typ) |
They operate from a single +5 V supply, specifically between +4.75 V and +5.25 V.
In power‑down mode the device draws as little as 35 pA (maximum).
The AD7741 has one single‑ended input channel; the AD7742 provides two differential or three pseudo‑differential input channels.
The master clock frequency may be as high as 6 MHz.