The AD7874 is a four-channel simultaneous sampling, 12-bit data acquisition system. It contains a high-speed 12-bit ADC, on-chip reference, on-chip clock, and four track/hold amplifiers. It is ideal for applications such as phased-array sonar and AC motor controllers where preserving the relative phase information is important.
The AD7874 provides four on‑chip track/hold amplifiers that enable simultaneous sampling of four analog inputs. It features a fast 12‑bit ADC with an 8 µs conversion time per channel and a combined sample rate of 29 kHz for all four channels. The device includes an on‑chip reference, on‑chip clock, and is available in DIP, LCCC, and SOIC packages.
Key functional blocks include a 3 V Zener reference, a 4‑channel analog multiplexer, and a successive‑approximation ADC. Conversion is started by a CONVST pulse and completed when the INT line goes low, after which data can be read from four on‑chip registers. The part is suited for applications such as phased‑array sonar and motor controllers where precise phase information is required.
| Sample Rate (all channels) | 29 kHz |
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The AD7874 can sample all four channels at up to 29 kHz.