AD7893SQ-2

Overview

The AD7893SQ-2 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 features an on-chip track/hold amplifier, internal clock, and high-speed serial interface. The device accepts a unipolar analog input range of 0 V to +2.5 V and requires an external +2.5 V reference voltage. 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 at a sampling rate of 117 kHz. It is housed in an 8-pin hermetic ceramic dual-in-line package (Q-8) with an extended operating temperature range of –55 °C to +125 °C.

Feature Summary

• Integrated 12-bit ADC with on-chip track/hold amplifier and internal clock generation
• High-speed two-wire serial interface for simplified microcontroller connectivity
• Single +5 V supply operation with low power consumption suitable for portable systems
• Extended industrial temperature range capability for harsh environments

Applications

• Battery-powered instrumentation requiring low power consumption
• Industrial data acquisition systems operating in extreme temperatures
• Portable measurement devices utilizing serial communication protocols
• Signal conditioning circuits requiring integrated scaling and conversion

Procurement Notes

Verify the specific ordering suffix SQ indicates the hermetic Q-8 ceramic package and extended temperature range when sourcing replacements. Confirm that the -2 variant corresponds to the 0 V to +2.5 V input range specification. Ensure compatibility with existing board layouts designed for 8-pin mini-DIP or SOIC footprints if transitioning from plastic packages. Validate that the system design accommodates the required external +2.5 V reference voltage source.

Selection Notes

Select the AD7893SQ-2 when an extended temperature range of –55 °C to +125 °C is required alongside a unipolar 0 V to +2.5 V input range. Choose this component over commercial variants if hermetic packaging is necessary for environmental protection. Consider the 6 μs conversion time and 117 kHz throughput rate against system timing constraints. Ensure the application can provide a stable external +2.5 V reference, as the device does not contain an internal reference generator.

Part Context

The AD7893 series comprises fast 12-bit ADCs available in multiple input ranges and package options. The SQ suffix denotes the hermetic ceramic dual-in-line package (Q-8) variant, distinct from the plastic DIP (N-8) and SOIC (SO-8) versions. This specific model targets applications demanding reliability in extreme thermal conditions while maintaining the compact form factor and low power characteristics of the broader AD7893 family.

Replacement Considerations

Direct substitutes include other AD7893SQ-2 units from Analog Devices. For package changes, verify pinout compatibility with AD7893AN-2 or AD7893AR-2, noting the difference in operating temperature and hermeticity.