AD7893AR-10

Overview

The AD7893AR-10 is a 12-bit successive approximation analog-to-digital converter housed in an 8-pin SOIC package. It operates from a single +5 V supply and features an on-chip track/hold amplifier with a conversion time of 6 μs maximum. The device accepts a bipolar analog input voltage range of ±10 V and utilizes a high-speed two-wire serial interface for data output. Typical power dissipation is 25 mW, with a maximum of 45 mW. It requires an external +2.5 V reference source connected to the REF IN pin.

Feature Summary

• Integrated signal scaling circuitry enables direct interfacing with ±10 V analog signals without external attenuation components.
• On-chip track/hold amplifier ensures accurate digitization of full-scale sine waves at throughput rates up to 117 kHz.
• Two-wire serial interface simplifies connection to microcontrollers and DSP processors by requiring only clock and data lines.

Applications

• Battery-powered instrumentation systems requiring low power consumption
• Industrial data acquisition systems handling bipolar sensor signals
• Portable test equipment utilizing single-supply operation

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm package type and temperature range. Ensure the required analog input range matches the component variant, as the -10 suffix denotes the ±10 V input specification. Confirm RoHS compliance status through official datasheets or distributor declarations prior to procurement.

Selection Notes

Select this component when a 12-bit resolution and ±10 V input range are required within an 8-pin footprint. Consider the 6 μs conversion time and 117 kHz maximum throughput rate for system timing constraints. Verify that the application can provide the necessary +2.5 V external reference voltage, as the device does not contain an internal reference generator.

Part Context

The AD7893 series comprises multiple variants differentiated by input voltage ranges and packaging options. The AR-10 designation specifically identifies the industrial temperature grade (-40°C to +85°C) and the SOIC-8 surface-mount package configuration. This part belongs to the LC2MOS family, combining precision bipolar circuits with CMOS logic for low-power performance.

Replacement Considerations

Direct functional substitutes within the same package and specification profile include the AD7893BR-10, which offers improved linearity accuracy (±1/2 LSB vs ±1 LSB) while maintaining identical electrical characteristics and pinout compatibility.

FAQ

What is the digital output coding format for the AD7893AR-10?

The AD7893AR-10 uses two's complement binary output coding to represent bipolar input voltages ranging from -10 V to +10 V.

How is the conversion process initiated on the AD7893?

Conversion is initiated by applying a rising edge pulse to the CONVST (Convert Start) pin, which triggers the on-chip track/hold amplifier to enter hold mode and begins the 6 μs conversion sequence.

What is the minimum acquisition time required between conversions?

To achieve optimum performance, a minimum of 600 ns should be allowed after the read operation ends before initiating the next conversion, ensuring the track/hold amplifier has sufficient time to settle.