AD1974 is a high performance single chip audio codec that provides four analog-to-digital converters (ADCs) with differential inputs using the Analog Devices, Inc Phase-locked loop (PLL) technology, with a 107 dB dynamic range and SNR -94 dB THD + N, supporting 24 bits and 8 kHz to 192 kHz sampling rates.
The AD1974 is a high‑performance, single‑chip audio codec that provides four differential ADCs using a multibit sigma‑delta architecture. It operates from a single 3.3 V supply and includes an SPI port for volume and parameter control.
The device features a phase‑locked loop for master‑clock generation, low EMI design, and supports sample rates from 8 kHz to 192 kHz. It is offered in a 48‑lead LQFP package and is suitable for automotive audio, home‑theater, and set‑top‑box applications.
| ADC Resolution | 24 bits |
|---|---|
| Full‑Scale Differential Input Voltage | 1.9 Vrms |
| Supply Voltages (AVDD, DVDD) | 3.3 V (typical) |
| Operating Temperature Range (case) | -40 °C to +125 °C |
| Dynamic Range (with A‑Weighted Filter) | 100 dB (typ) |
| Total Harmonic Distortion + Noise (THD+N) | -96 dB to -87 dB |
| Master Clock Frequency | 12.288 MHz |
| Package | 48‑lead LQFP |
The AD1974 operates from a single 3.3 V supply for both analog and digital sections.
The device contains four analog‑to‑digital converters (ADCs).
The AD1974 is functionally guaranteed from –40 °C to +125 °C case temperature.
The internal PLL generates a master clock of 12.288 MHz.