AD7893SQ-10

Overview

The AD7893SQ-10 is a 12-bit successive approximation analog-to-digital converter (ADC) fabricated in Analog Devices' LC2MOS process. It operates from a single +5 V supply and accepts an analog input range of ±10 V. The device integrates a track/hold amplifier, internal clock, and serial interface within an 8-pin hermetic Cerdip package. Key electrical specifications include a maximum conversion time of 6 μs, a typical power dissipation of 25 mW, and a signal-to-noise ratio of 70 dB min at a sampling rate of 117 kHz. It supports an extended operating temperature range from -55 °C to +125 °C.

Feature Summary

• Integrated signal scaling circuitry for direct ±10 V input handling without external attenuators
• On-chip track/hold amplifier with acquisition time under 1.5 μs
• Two-wire high-speed serial interface for simplified microcontroller connectivity
• Hermetic 8-pin Cerdip packaging suitable for harsh environments

Applications

• Industrial data acquisition systems requiring bipolar voltage monitoring
• Harsh environment instrumentation utilizing hermetic packaging
• Battery-powered portable test equipment due to low power consumption
• Process control loops involving ±10 V sensor signals

Procurement Notes

Verify the specific suffix SQ-10 corresponds to the hermetic Cerdip package and extended temperature grade when sourcing. Confirm that the required input range matches the ±10 V specification inherent to this variant. Ensure the design accommodates the 8-pin footprint and serial interface timing requirements specified in the datasheet.

Selection Notes

Select the AD7893SQ-10 when bipolar ±10 V inputs must be digitized directly without external scaling components. Choose this variant over plastic DIP versions if hermetic sealing is required for reliability in extreme temperatures. Consider the 6 μs conversion speed and serial interface compatibility with the target processor architecture.

Part Context

The AD7893 series comprises four variants differentiated by input range and package type. The AD7893-10 specifically handles ±10 V inputs. The 'S' designation indicates the extended temperature range (-55 °C to +125 °C), while 'Q' denotes the hermetic Cerdip package. This distinguishes it from commercial plastic DIP or SOIC options.

Replacement Considerations

Direct pin-compatible replacements are limited due to the specific combination of ±10 V input range, hermetic packaging, and extended temperature rating. Verify interface compatibility if substituting with other 12-bit SAR ADCs.