AD7894AR-10REEL7

Overview

The AD7894AR-10REEL7 is a 14-bit successive approximation analog-to-digital converter (ADC) housed in an 8-lead SOIC package. 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 supports a bipolar input voltage range of ±10 V with a typical power consumption of 20 mW. Key electrical specifications include a maximum conversion time of 5 µs, a signal-to-noise ratio of 77 dB, and a differential nonlinearity of ±1.5 LSB. It utilizes a two-wire serial interface for data output and includes an automatic power-down mode to optimize energy efficiency.

Feature Summary

• Integrated on-chip track/hold amplifier and internal clock generation circuitry
• High-speed two-wire serial interface with external clock access
• Automatic power-down mode that activates after conversion completion
• Bipolar zero error adjustment capability for precision applications

Applications

• Battery-powered portable instrumentation systems
• Industrial process control data acquisition
• Medical equipment signal conditioning

Procurement Notes

Verify the specific ordering suffix against manufacturer documentation to confirm packaging type and temperature grade. Ensure the selected variant matches the required input voltage range and accuracy specifications for the target application environment.

Selection Notes

Select this component when a compact 14-bit resolution is required alongside low power consumption. The ±10 V input range eliminates the need for external signal scaling resistors, simplifying the front-end design compared to unipolar variants.

Part Context

This part belongs to the AD7894 family of fast, 14-bit ADCs. It serves as a pin-compatible upgrade to the 12-bit AD7895, offering higher resolution within the same 8-lead SOIC footprint while maintaining single-supply operation capabilities.

Replacement Considerations

AD7894BR-10REEL7

FAQ

What is the maximum throughput rate achievable with the AD7894?

The maximum throughput rate is 160 kHz, achieved using a 16 MHz serial clock with a total cycle time of 6.25 ms.

How does the automatic power-down mode function?

In Mode 2 operation, the device enters power-down automatically once the BUSY signal goes low after conversion, waking up prior to the next CONVST pulse.

What reference voltage is required for correct operation?

The AD7894 requires an external +2.5 V reference connected to the REF IN pin, which is buffered on-chip.