The AD1895 is a 24-bit, high performance, single-chip, second generation asynchronous sample rate converter. It offers features such as a THD + N range of -115 dB to -122 dB (depending on sample rate and input frequency), 128 dB (A-Weighted) dynamic range, 192 kHz sampling frequencies, improved jitter rejection, and 1:8 upsampling and 7.75:1 downsampling ratios.
The AD1895 is a 24‑bit, high‑performance, single‑chip asynchronous sample‑rate converter. It offers up to 192 kHz input and output sampling rates, 128 dB (A‑weighted) dynamic range, and THD+N between –115 dB and –122 dB depending on conditions. The device supports multiple serial formats—including left‑justified, I²S, right‑justified (16‑24 bit) and TDM—for easy integration with DSPs and audio processors.
Key features include a 3‑wire serial interface, bypass mode, master/slave clock options, 1:8 up‑sampling and 7.75:1 down‑sampling ratios, and programmable word‑length output. The AD1895 can be daisy‑chained in TDM mode, allowing up to eight devices in standard mode or four in master/TDM mode.
| Resolution | 24 Bits |
|---|---|
| Supply Voltage VDD_CORE | 3.3 V |
| Supply Voltage VDD_IO | 5.0 V (or 3.3 V) |
| Maximum Sample Rate | 192 kHz |
| Dynamic Range (A‑Weighted) | 128 dB |
| THD + N | –115 dB to –122 dB |
| Input Voltage High | 2.4 V |
| Input Voltage Low | 0.8 V |
The AD1895 supports up to 192 kHz for both input and output sample rates.
The core supply (VDD_CORE) requires 3.3 V and the I/O supply (VDD_IO) can be 5.0 V or 3.3 V.