The AD574A is a complete 12-bit successive-approximation analog-to-digital converter with 3-state output buffer circuitry for direct interface to an 8- or 16-bit microprocessor bus. A high precision voltage reference and clock are included on-chip, and the circuit guarantees full-rated performance.
The AD574A is a complete 12‑bit analog‑to‑digital converter that integrates reference, clock, and conversion logic on a single chip. It offers guaranteed linearity over temperature ranges, buried Zener reference for stability, and multiple input ranges (±10 V, ±20 V, 0‑10 V, 0‑20 V). The device is available in several grades (AJ, AK, AL, AS, AT, AU) and package types (ceramic DIP, plastic DIP, PLCC, LCC).
The document provides detailed specifications such as resolution, linearity error, temperature coefficients, power supply requirements, and absolute maximum ratings. It also includes block diagrams, pin configurations, ordering information, and recommendations for sample‑and‑hold amplifiers and power‑supply decoupling to achieve full 12‑bit accuracy.
| Resolution | 12 bits |
|---|---|
| Linearity Error @ +25°C | ±0.5 LSB |
| Unipolar Offset (adjustable to zero) | +2 LSB |
| Bipolar Offset (adjustable to zero) | +4 LSB |
| Temperature Range (AJ, AK, AL grades) | 0 °C to +70 °C |
| Operating Current (Thoaic) | 30 mA typical |
| Power Dissipation | 390 mW (typical) |
The AD574A provides 12‑bit resolution.
The device has a maximum conversion time of 35 µs.