AD7899ARS-1

Overview

The AD7899ARS-1 is a 14-bit successive-approximation analog-to-digital converter (ADC) operating from a single 5 V supply. It achieves a maximum throughput rate of 400 kSPS with a conversion time of 2.2 µs and a track/hold acquisition time of 0.3 µs. The device features ±5 V and ±10 V bipolar input ranges, CMOS/TTL parallel data outputs, and an internal 2.5 V reference. Typical power consumption is 80 mW in normal mode and 20 µW in standby. It is housed in a 28-lead Shrink Small Outline (RS-28) package and operates within a temperature range of -40°C to +85°C.

Feature Summary

• Integrated signal conditioning circuitry allows direct acceptance of ±10 V, ±5 V, ±2.5 V, 0 V to 2.5 V, and 0 V to 5 V input ranges without external scaling components.
• High-speed parallel interface supports both 3 V and 5 V logic levels, enabling direct interfacing with microprocessors and DSPs.
• Analog inputs include overvoltage protection, allowing voltage excursions beyond the selected input range without damaging the device.
• Flexible clocking options allow selection between an internal laser-trimmed oscillator or an external clock source applied to the CLKIN pin.

Applications

• Industrial process control systems requiring high accuracy and fast sampling rates.
• Portable instrumentation powered by single 5 V supplies.
• Data acquisition systems interfacing with 3 V or 5 V digital processors.
• Medical equipment utilizing bipolar signal inputs.

Procurement Notes

Verify the specific suffix 'ARS' indicates the Shrink Small Outline (SSOP) package variant rather than the standard SOIC. Confirm the '-1' designation corresponds to the ±5 V and ±10 V input range version. Ensure the component meets the required commercial temperature grade (-40°C to +85°C). Cross-reference the datasheet revision to confirm pinout compatibility if replacing older versions.

Selection Notes

Select the AD7899ARS-1 when bipolar input signals up to ±10 V are required alongside a 14-bit resolution. This model is appropriate for designs needing a parallel interface compatible with 3 V logic families. Consider the AD7899ARS-2 or AD7899ARS-3 if unipolar or narrower bipolar ranges are sufficient, as they offer different input configurations. Evaluate power constraints against the 80 mW typical dissipation.

Part Context

The AD7899 series comprises fast, low-power 14-bit ADCs designed for single-supply operation. The AD7899ARS-1 specifically denotes the Shrink Small Outline package variant with ±5 V and ±10 V input capabilities. It belongs to a family that includes variants with different input ranges and packaging options, all sharing the same core SAR architecture and performance specifications.

Replacement Considerations

The AD7899AR-1 serves as a functional equivalent but utilizes a standard SOIC-28 package instead of the SSOP form factor. Verify footprint compatibility before substitution. Other series members like the AD7899BR-1 offer tighter accuracy specifications but share similar electrical characteristics.