AD7872BR

Overview

The AD7872BR is a complete monolithic 14-bit analog-to-digital converter (ADC) fabricated in LC2MOS technology. It operates from ±5 V power supplies and accepts bipolar input signals within the ±3 V range. The device features an internal track-and-hold amplifier, successive approximation register, and a laser-trimmed 3 V buried Zener reference. It provides a serial digital interface with an 83 kSPS throughput rate and a typical data access time of 57 ns. Dynamic performance includes an 80 dB signal-to-noise ratio at a 10 kHz input frequency. The industrial temperature version (B suffix) supports operation from -40°C to +85°C.

Feature Summary

• Serial-only output architecture for simplified microprocessor interfacing
• Integrated self-contained clock requiring no external timing components
• Internal 3 V buried Zener voltage reference with decoupling capability

Applications

• Digital signal processing systems
• High-speed modem applications
• Speech recognition and synthesis circuits
• Spectrum analysis equipment
• DSP servo control loops

Procurement Notes

Verify the B suffix indicates the industrial temperature grade (-40°C to +85°C). Confirm the package type matches system requirements, as the AD7872 series is available in PDIP, CERDIP, and SOIC configurations. Ensure supply voltages are strictly maintained at ±5 V ±5% for specified performance. Check RoHS compliance status for the specific manufacturing lot.

Selection Notes

Select the AD7872BR when a serial interface is preferred over parallel or byte modes offered by the AD7871 variant. This part is suitable for designs requiring a single-ended analog input channel with 14-bit resolution. Verify that the system can accommodate the required pull-up resistors on the serial data lines. Consider the 83 kSPS throughput limit against the Nyquist rate of the input signal bandwidth.

Part Context

The AD7872BR belongs to the AD7871/AD7872 family of complete 14-bit sampling ADCs. While the AD7871 offers parallel, byte, and serial options, the AD7872 is dedicated exclusively to serial data output. Both devices share identical core conversion architectures and dynamic specifications, differing primarily in digital interface flexibility and pin count.

Replacement Considerations

The AD7872KRZ is a documented substitute within the same product family. Verify that the replacement maintains the required serial interface protocol and thermal characteristics.