AD7876TQ

Overview

The AD7876TQ is a complete, monolithic 12-bit successive approximation analog-to-digital converter (ADC) manufactured by Analog Devices Inc. It operates from ±5 V power supplies and features an internal track-and-hold amplifier with a 2 μs acquisition time and an 8 μs conversion time. The device accepts a single-ended analog input range of ±10 V and includes an on-chip 3 V buried Zener reference. Data output formats include parallel, byte, and serial interfaces. The T suffix indicates an extended temperature rating of −55°C to +125°C.

Feature Summary

• Integrated 12-bit SAR ADC with built-in clock oscillator and laser-trimmed timing.
• Versatile digital interface supporting parallel, two-byte, and serial data transfer modes.
• Internal 3 V reference with external scaling capability for ±10 V input ranges.

Applications

• Data acquisition systems requiring high accuracy over wide temperature ranges.
• Industrial process control and monitoring applications.
• Test and measurement equipment utilizing ±10 V signal inputs.

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm package type and temperature grade. Ensure compatibility with existing system voltage rails and interface logic levels before procurement.

Selection Notes

Select this component when a single-channel, 12-bit resolution is required with a wide bipolar input range. Confirm that the ±10 V input specification aligns with the sensor or signal source requirements.

Part Context

This part belongs to the AD7870/AD7875/AD7876 family of complete 12-bit sampling ADCs. The AD7876 variant specifically supports a ±10 V input range, distinguishing it from the ±3 V AD7870 and unipolar AD7875.

Replacement Considerations

Direct replacements within the same family include AD7876BRZ and AD7876CRZ. Verify pinout and thermal specifications when substituting different package types such as SOIC or DIP.

FAQ

What is the maximum throughput rate of the AD7876?

The maximum throughput rate is determined by the sum of the conversion time and the track-and-hold acquisition time, resulting in a maximum rate of 100 kS/s.

How is the internal reference utilized for the ±10 V input range?

The internal 3 V reference can be scaled externally using resistor networks to generate the necessary 10 V reference required for the AD7876's full-scale input range.