AD7401A is a second-order, sigma-delta (Σ-Δ) modulator that converts an analog input signal to a digital output signal with a resolution of 16 bits. It is designed for use in high-performance data acquisition systems, analog-to-digital conversion, and industrial control applications.
The AD7401A from Analog Devices is a second‑order sigma‑delta modulator that converts an analog input into a high‑speed 1‑bit data stream. It features an on‑chip digital isolator, on‑chip reference, and operates from a 5 V supply with a differential input range of ±250 mV.
The device is supplied in a 16‑lead SOIC package, supports a maximum external clock rate of 20 MHz, and meets safety standards such as UL 1577 with 3750 Vrms isolation for 1 minute. It is intended for applications like AC motor controls, shunt current monitoring, and data acquisition systems.
| Resolution | 16 Bits |
|---|---|
| Integral Nonlinearity (INL) | +2 LSB typical at 16 bits |
| Differential Nonlinearity (DNL) | +0.9 LSB, no missing codes |
| Input Voltage Range | ±250 mV (full scale ±320 mV) |
| Maximum Clock Rate | 20 MHz |
| Power Consumption | 17 mA typical at 5.5 V |
| Isolation Voltage | 3750 Vrms for 1 minute (UL 1577) |
| Operating Temperature Range | ‑40 °C to +125 °C |
| Package | 16‑lead SOIC (RW‑16) |
The AD7401A supports up to 20 MHz external clock rate.
It meets 3750 Vrms isolation for 1 minute as required by UL 1577.
Typical power consumption is 17 mA at 5.5 V supply.
The device accepts a differential input of ±250 mV (full‑scale ±320 mV).