AD7874BN

ADCs/DACs - Special Purpose Overview

The AD7874BN 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 3V reference, and internal clock logic. The device operates on dual ±5 V supplies with a nominal input range of ±10 V. It achieves a sample rate of 29 kHz across all channels, utilizing a parallel digital interface for direct connection to microprocessors. The component is housed in a 28-pin plastic DIP package and supports an operating temperature range from -40°C to +85°C.

ADCs/DACs - Special Purpose Feature Summary

• Simultaneous Sampling: Four dedicated track/hold amplifiers preserve relative phase information across input channels.
• Integrated Architecture: Combines a 12-bit SAR ADC, laser-trimmed 3V reference, and internal clock oscillator.
• Tight Aperture Delay Matching: Channel-to-channel aperture delay matching is less than 4 ns.
• Fast Conversion: 8 μs conversion time per channel allows a total throughput of 29 kHz.

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 'N' indicates the 28-pin plastic DIP package option. Confirm that the B version meets the required Signal-to-Noise Ratio (SNR) minimum of 72 dB and relative accuracy of ±1/2 LSB. Ensure supply voltages are strictly maintained within ±5% of ±5 V for specified performance.

ADCs/DACs - Special Purpose Selection Notes

Select the AD7874BN when simultaneous sampling of multiple signals is critical to maintain phase coherence. This model is suitable for applications requiring a 12-bit resolution with a maximum sample rate of 29 kHz. Verify that the system can accommodate the ±10 V analog input range and provides the necessary dual ±5 V power rails.

ADCs/DACs - Special Purpose Part Context

The AD7874BN belongs to the AD7874 family of data acquisition systems. It is distinguished from the A version by higher dynamic performance specifications, specifically an SNR of 72 dB compared to 70 dB. It shares the same functional architecture as other variants but utilizes the N package designation for the standard plastic dual-in-line form factor.

ADCs/DACs - Special Purpose Replacement Considerations

The AD7874AN serves as a lower-performance alternative within the same package. For surface-mount requirements, the AD7874BRZ offers identical electrical characteristics in a 28-SOIC package. Cross-model substitution requires verifying pin compatibility and package dimensions.