AD28msp01 is a complete analog I/O port for DSP-based FAX/MODEM applications, featuring a linear-coded 16-bit Sigma-Delta ADC and DAC, as well as a digital resampling/interpolation filter.
The AD28msp01 is a complete analog front‑end for high‑performance DSP‑based modems, providing 16‑bit sigma‑delta ADC and DAC, on‑chip anti‑aliasing and anti‑imaging filters, and programmable sample‑rate and clock generation. It operates from a +5 V supply, includes a full‑duplex serial port for DSP interfacing, and supports both synchronous and asynchronous modes.
The document includes a functional block diagram, detailed pin descriptions, descriptions of the A/D and D/A conversion paths, filter structures, clock generation, and control‑register programming. It also provides example DSP‑processor interface code and timing requirements for the serial SPORT interface.
| Supported sampling rates (low‑rate) | 7.2 kHz, 8.0 kHz, 9.6 kHz |
|---|---|
| Supported sampling rates (high‑rate) | 28.8 kHz, 32.0 kHz, 38.4 kHz |
| Master clock input frequency | 13.824 MHz |
| Serial clock rate (SPORT) | 1.7280 MHz |
| Analog supply voltage | +5 V (nominal) |
| Digital supply voltage | +5 V (nominal) |
| Differential output load capability | 2 kΩ or greater |
| Maximum differential output swing | 6.312 V p‑p |
The master clock input must be 13.824 MHz.
It supports low‑rate sampling of 7.2 kHz, 8.0 kHz, 9.6 kHz and high‑rate sampling of 28.8 kHz, 32.0 kHz, 38.4 kHz.
The device operates from a nominal +5 V analog and digital supply, with a low‑power sleep mode available.
The SPORT serial port uses a 1.7280 MHz serial clock.