AD1890/AD1891 are Analog Devices' seamless transition asynchronous sample rate converters that operate in the range of 8kHz to 56kHz and support from 1:2 to 2:1 sample rate ratios.
The AD1890 and AD1891 SamplePort™ devices are fully digital, stereo asynchronous sample‑rate converters (ASRCs) that automatically sense input and output sample‑clock relationships, eliminating the need for manual programming. They support 8 kHz to 56 kHz sample‑clock frequencies and a 1:2 to 2:1 clock‑ratio, providing high‑quality audio conversion for professional and lower‑cost applications.
Typical applications include digital mixing consoles, audio workstations, digital recorders, broadcast equipment, and multimedia systems. Key features are automatic sample‑frequency detection, low jitter tolerance, selectable fast or slow settling modes, and flexible four‑wire serial interfaces.
| Dynamic Range (AD1890) | 120 dB |
|---|---|
| Dynamic Range (AD1891) | 96 dB |
| Supply Voltage (VDD) | 2.7 V – 5.5 V |
| Supply Current (VDD = 5.0 V) | 35 mA – 40 mA |
| Sample Clock Frequency Range | 8 kHz – 56 kHz |
| Clock Ratio | 1:2 – 2:1 |
| Input Word Width (AD1890) | 4 – 20 bits |
The devices operate from a VDD of 2.7 V to 5.5 V.
The input and output sample‑clock jitter tolerance is up to 10 ns for less than 1 dB degradation in THD+N.