AD7739 is an 8-channel, high throughput, 24-bit ∑-∆ ADC with features such as high resolution, optimized fast channel switching, configurable inputs, and on-chip per channel system calibration. It is suitable for applications such as PLCs/DCSs, multiplexing, process control, and industrial instrumentation.
The AD7739 is a high‑precision, high‑throughput analog‑to‑digital converter featuring eight single‑ended or four fully‑differential input channels. It offers 24‑bit resolution with no missing codes, selectable input ranges (+0.625 V, +1.25 V, +2.5 V), and a 3‑wire serial interface compatible with SPI, QSPI, Microwire and DSP.
The device operates from a single 5 V analog supply, supports temperatures from –40 °C to +105 °C, and dissipates as little as 85 mW in normal mode. Detailed specifications, timing diagrams, pin configurations, and calibration procedures are provided for designers of industrial instrumentation and multiplexed measurement systems.
| Effective Resolution (500 Hz) | 18‑bit p‑p (21 bits effective) |
|---|---|
| Effective Resolution (4 kHz) | 16‑bit p‑p (19 bits effective) |
| Input Voltage Ranges | +0.625 V, +1.25 V, +2.5 V (single‑ended or differential) |
| Supply Voltage | 5 V analog, 3 V or 5 V digital |
| Package | 24‑lead TSSOP |
| Operating Temperature Range | -40 °C to +105 °C |
| Integral Nonlinearity (INL) | +0.0015 % of FSR |
| Gain Error | +0.2 % before calibration |
| Common‑Mode Rejection | 80 dB (DC, AIN=1 V) |
It uses a 3‑wire serial interface that is compatible with SPI®, QSPI™, Microwire™, and DSP interfaces.
The device is specified for operation from –40 °C to +105 °C.
It operates from a single 5 V analog supply, with a 3 V or 5 V digital supply option.