AD1890/AD1891 is an asynchronous sample rate converter with automatic sensing function, which can automatically sense the input sample frequency and does not require any programming. It has a sample clock frequency range of 8kHz to 56kHz, a ratio range of 1:2 to 2:1, and can meet the needs of various applications.
The AD1890 and AD1891 SamplePort™ asynchronous sample‑rate converters (ASRCs) convert between independent input and output sample clocks ranging from 8 kHz to 56 kHz. They use on‑chip FIR filtering with up to 4 million 22‑bit coefficients, offering low distortion (‑106 dB THD+N at 1 kHz) and selectable fast or slow settling modes for jitter rejection.
The devices are supplied in 28‑lead plastic DIP and PLCC packages, operate from a +5 V supply, and include extensive pin‑configurable options such as group‑delay mode, clock polarity, and mute control. Detailed specifications, pin lists, timing diagrams, and mechanical dimensions are provided for system integration.
| Supply Voltage | +5.0 V |
|---|---|
| Input Sample Clock Frequency Range | 8 kHz to 56 kHz |
| Group Delay (short mode) | 700 ps |
| Passband Ripple | 0.01 dB |
| Stopband Attenuation | 110 dB |
The devices accept input sample clocks from 8 kHz up to 56 kHz.
The DIP version uses a 28‑lead plastic package.
In short‑delay mode the group delay is approximately 700 ps.