The AD7878 is a fast, complete, 12-bit A/D converter with a versatile DSP interface consisting of an 8-word, first-in, first-out (FIFO) memory and associated control logic. The FIFO memory allows up to eight samples to be digitized before the microprocessor is required to service the A/D converter. The eight words can then be read out of the FIFO at maximum microprocessor speed.
The AD7878 is a fast, complete 12‑bit A/D converter with a built‑in track/hold amplifier, on‑chip reference and an 8‑word FIFO. It provides a 41 ns maximum data‑access time and low power consumption (typical 60 mW). The device is designed for direct interfacing to high‑speed DSPs and 16‑bit microprocessors.
The part is offered in four package styles (28‑pin DIP, PLCC, LCCC, and ceramic) and operates over a bipolar input range of ±3 V. Detailed specifications cover dynamic performance, timing characteristics, absolute maximum ratings, pin functions, and internal FIFO architecture.
| Signal‑to‑Noise Ratio (SNR) | 72 dB (min) at 10 kHz |
|---|---|
| Power Dissipation | Typical 60 mW, max 95.5 mW |
| Data Access Time | 41 ns max |
| FIFO Depth | 8 words |
The maximum data access time is 41 ns.
Typical power consumption is 60 mW.
The FIFO can store up to 8 conversion words.