AD7874BQ

ADCs/DACs - Special Purpose Overview

The AD7874BQ is a four-channel, 12-bit simultaneous sampling data acquisition system manufactured by Analog Devices Inc. It integrates a high-speed successive approximation ADC, on-chip reference, internal clock, and four track/hold amplifiers. The device operates with ±5 V supplies and supports an analog input range of ±10 V. Key electrical parameters include a maximum conversion time of 32.5 μs per channel, a sample rate of 29 kHz for all channels, and a minimum signal-to-noise ratio of 72 dB. It utilizes a parallel interface and is housed in a 28-lead Cerdip package.

ADCs/DACs - Special Purpose Feature Summary

• Four independent on-chip track/hold amplifiers enable simultaneous sampling of four input channels.
• Tight aperture delay matching of less than 4 ns preserves relative phase information between channels.
• Integrated 3 V buried Zener reference with buffered output capability.
• Fast microprocessor interface with three-state TTL outputs and implicit addressing.

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 ordering suffix 'Q' corresponds to the 28-lead Cerdip package option as defined in the manufacturer's ordering guide. Confirm that the B version designation indicates a relative accuracy of ±1/2 LSB maximum and a minimum SNR of 72 dB. Ensure supply voltages are strictly maintained within ±5% of nominal ±5 V levels for specified performance.

ADCs/DACs - Special Purpose Selection Notes

Select the AD7874BQ when simultaneous multi-channel sampling with minimal phase error is required. The B version offers higher dynamic performance (72 dB SNR) compared to the A version. Verify that the 28-lead Cerdip package meets environmental and mechanical requirements for the target application environment.

ADCs/DACs - Special Purpose Part Context

The AD7874BQ belongs to the AD7874 family of data acquisition systems. It is functionally identical to the AD7874BN and AD7874BR but differs in packaging. The 'Q' suffix denotes the leadless ceramic chip carrier or Cerdip variant, while 'N' indicates plastic DIP and 'R' indicates SOIC. All variants share the same LC2MOS fabrication process and core specifications.

ADCs/DACs - Special Purpose Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Cross-model comparisons within the AD7874 family require verification of package compatibility and specific performance tier alignment (A vs. B versions).