AD7874BR

ADCs/DACs - Special Purpose Overview

The AD7874BR is a four-channel, 12-bit simultaneous sampling data acquisition system manufactured by Analog Devices Inc. It integrates a high-speed successive approximation ADC, four independent track/hold amplifiers, an on-chip clock, and a reference buffer. The device supports ±5 V dual supplies and features a parallel digital interface compatible with 16-bit microprocessors. Key electrical parameters include a maximum conversion time of 32.5 μs per channel, a typical aperture delay matching of less than 4 ns, and a signal-to-noise ratio of 72 dB minimum for the B version. It operates within a temperature range of -40°C to +85°C.

ADCs/DACs - Special Purpose Feature Summary

• Four independent on-chip track/hold amplifiers enable true simultaneous sampling of all input channels.
• Tight aperture delay matching (less than 4 ns) preserves relative phase information across channels.
• Integrated 3 V buried Zener reference with buffered output capability.
• Fast parallel interface allows direct connection to modern 16-bit microprocessors and DSPs.

ADCs/DACs - Special Purpose Applications

• Phased-array sonar systems
• AC motor controllers
• Adaptive filters
• Digital signal processing

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific suffix 'R' indicates the SOIC package variant when sourcing. Confirm that the B version meets the required Signal-to-Noise Ratio specification of 72 dB minimum. Ensure supply voltages are strictly maintained at +5 V and -5 V for specified performance. Check for ESD sensitivity precautions during handling.

ADCs/DACs - Special Purpose Selection Notes

Select the AD7874BR over the AN version if a higher Signal-to-Noise Ratio (72 dB vs. 70 dB) and tighter accuracy (±1/2 LSB vs. ±1 LSB) are required. The BR variant utilizes the SOIC package; verify board space constraints against DIP or LCCC options. Ensure the application requires simultaneous sampling rather than multiplexed acquisition to justify this component choice.

ADCs/DACs - Special Purpose Part Context

The AD7874 belongs to the AD7874 family of LC2MOS data acquisition systems. The BR designation specifically identifies the B-grade performance level packaged in a 28-pin Small Outline Integrated Circuit (SOIC). This part is distinct from the AD7873 touch screen controller and other members of the broader analog converter portfolio.

ADCs/DACs - Special Purpose Replacement Considerations

Public confirmed substitute part numbers: None identified in verified documentation.