AD7874AR

ADCs/DACs - Special Purpose Overview

The AD7874AR is a four-channel, 12-bit simultaneous sampling data acquisition system fabricated in LC2MOS technology. It integrates a high-speed ADC, on-chip reference, internal clock, and four track/hold amplifiers to preserve relative phase information across channels. The device operates with ±5 V supplies and features a parallel interface for direct connection to microprocessors. Key electrical parameters include a 29 kHz sample rate for all four channels, an input voltage range of ±10 V, and a nominal 3 V reference. Aperture delay matching is specified at a maximum of 4 ns.

ADCs/DACs - Special Purpose Feature Summary

• Four independent on-chip track/hold amplifiers enable true simultaneous sampling of input channels.
• Tight aperture delay matching ensures minimal phase error between channels and across multiple devices.
• Integrated laser-trimmed 3 V reference and internal clock oscillator reduce external component count.
• Fast parallel digital interface supports direct connection to 16-bit microprocessors and DSPs.

ADCs/DACs - Special Purpose Applications

• Phased-array sonar systems requiring precise channel phase alignment.
• AC motor controllers needing synchronized multi-phase signal acquisition.
• Adaptive filter implementations in digital signal processing.
• Spectrum analysis equipment utilizing high dynamic performance specifications.

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific suffix 'R' corresponds to the SOIC-28 package variant when sourcing. Confirm that the A-version designation aligns with the required Signal-to-Noise Ratio (70 dB min) and accuracy specifications (+/- 1 LSB max). Ensure supply voltages are strictly maintained within +/- 5% of nominal to meet datasheet performance guarantees.

ADCs/DACs - Special Purpose Selection Notes

Select the AD7874AR when simultaneous sampling of four channels is critical for maintaining signal phase relationships. This model is suitable for applications requiring a 12-bit resolution with a 29 kHz throughput per channel. Consider the integrated reference and clock features if board space is limited. Verify that the parallel interface timing requirements match the target microprocessor or DSP architecture.

ADCs/DACs - Special Purpose Part Context

The AD7874 belongs to Analog Devices' family of specialized data acquisition ICs designed for high-performance signal processing. It utilizes Linear Compatible CMOS (LC2MOS) technology to combine precision bipolar circuits with low-power CMOS logic. The part is available in various packages including DIP, LCCC, and SOIC, with different temperature grades and accuracy versions such as the AR and BR series.

ADCs/DACs - Special Purpose Replacement Considerations

Public confirmed substitute part numbers are not provided in the verified source material.