AD7875LPZ

Overview

The AD7875LPZ is a complete monolithic 12-bit successive approximation analog-to-digital converter (ADC) manufactured by Analog Devices Inc. It integrates a track-and-hold amplifier, an 8 μs ADC core, and a laser-trimmed internal clock on a single chip. The device operates from ±5 V power supplies and accepts a unipolar analog input voltage range of 0 V to +5 V. It features versatile digital interface options including parallel, byte, and serial data formats with a typical data access time of 57 ns. The component achieves a signal-to-noise ratio of 72 dB at a 10 kHz input frequency and dissipates approximately 60 mW of power.

Feature Summary

• Integrates a high-speed track-and-hold amplifier capable of acquiring signals to 12-bit accuracy within 2 μs.
• Includes a factory-trimmed 3 V buried Zener reference output available for external scaling or loading.
• Supports flexible microprocessor interfacing through selectable parallel, two-byte, or serial data output modes.

Applications

• High-speed traditional measurement and control systems requiring multiplexed channels
• Digital signal processing applications utilizing DSP-compatible interfaces
• Data acquisition systems needing fast bus access times for modern microprocessors

Procurement Notes

Verify the specific suffix 'LPZ' against the manufacturer's current ordering guide to confirm package type and compliance status. Ensure the selected temperature grade matches the operational environment requirements. Confirm availability through authorized distributors as standard stock levels may vary.

Selection Notes

Select this component when a single-channel, 12-bit resolution is required with a unipolar 0 V to +5 V input range. Choose this part over the AD7870 or AD7876 if bipolar inputs are not needed. Ensure the system design accommodates the ±5 V dual supply requirement and provides adequate decoupling for the internal reference output.

Part Context

The AD7875 belongs to the AD7870/AD7875/AD7876 family of complete 12-bit sampling ADCs. These devices utilize LC2MOS technology to combine a SAR ADC, track-and-hold, and reference on one die. The AD7875 specifically targets unipolar applications, distinguishing it from the bipolar AD7870 and AD7876 variants within the same series.

Replacement Considerations

The AD7875KNZ serves as a lead-free alternative within the same functional family. Verify pin compatibility and electrical specifications before substitution. Other family members like the AD7870 differ in input range and require different circuit adjustments.