AD7899BR-3REEL7

Overview

The AD7899BR-3REEL7 is a 14-bit successive-approximation analog-to-digital converter (ADC) from Analog Devices, operating on a single 5 V supply. It delivers 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 an internal 2.5 V reference and accepts bipolar input ranges of ±2.5 V. It utilizes a high-speed parallel interface compatible with 3 V or 5 V logic levels via the VDRIVE pin. Typical power consumption is 80 mW in normal mode, reducing to 20 µW in standby mode controlled by the STBY pin.

Feature Summary

• Integrated signal conditioning circuitry supporting ±2.5 V bipolar input ranges with overvoltage protection.
• High-speed parallel data bus allowing direct interfacing with 3 V or 5 V microprocessors and DSPs.
• Flexible clocking options utilizing either an internal laser-trimmed oscillator or an external clock source.

Applications

• Portable instrumentation requiring low power consumption and single-supply operation.
• Industrial process control systems utilizing standard bipolar voltage signals.
• Data acquisition modules interfacing with 3 V digital logic processors.

Procurement Notes

Verify the specific suffix REEL7 indicates tape-and-reel packaging when sourcing components. Confirm that the BR variant meets the required relative accuracy specifications for your application. Ensure the ordering documentation explicitly references the AD7899BR-3REEL7 part number to avoid confusion with other input range versions or package types within the AD7899 family.

Selection Notes

Select this component if a 14-bit resolution and 400 kSPS speed are required for bipolar signals limited to ±2.5 V. Consider the AD7899-1 or AD7899-2 variants if wider input ranges such as ±10 V or unipolar 0 V to 5 V are necessary. Evaluate the need for external versus internal clocking based on system jitter requirements and interface complexity constraints.

Part Context

This component belongs to the AD7899 family of fast, low-power 14-bit ADCs. The BR designation specifies commercial temperature performance (-40°C to +85°C) and tighter linearity accuracy compared to the AR version. The -3 suffix defines the specific ±2.5 V bipolar input capability, distinguishing it from the broader industrial ranges offered by other model variations.

Replacement Considerations

Direct functional replacements include the AD7899AR-3REEL7 for identical electrical performance with commercial temperature grading, or the AD7899SR-3 for extended military temperature ranges. Verify pin compatibility and software register configurations remain unchanged during substitution.