AD7898AR-3REEL7

Overview

The AD7898AR-3REEL7 is a 12-bit successive approximation analog-to-digital converter (ADC) housed in an 8-lead SOIC package. It operates from a single 5 V supply and achieves throughput rates up to 220 kSPS. The device features an on-chip track/hold amplifier, an internal clock oscillator, and a flexible high-speed serial interface compatible with 3 V processors via the VDRIVE pin. Designed for the AD7898-3 variant, it accepts an analog input range of ±2.5 V. Key specifications include a maximum power dissipation of 22.5 mW, a conversion time of 3.3 µs in Mode 0, and a signal-to-noise ratio of 71 dB minimum.

Feature Summary

• Single 5 V supply operation with low power consumption suitable for battery-powered applications.
• Flexible serial interface supporting two modes: internal clocking (Mode 0) and external clocking (Mode 1).
• On-chip track/hold amplifier ensures accurate signal acquisition without external components.
• VDRIVE pin allows direct interfacing with 3 V or 5 V processor systems independent of the main supply.

Applications

• Portable instrumentation requiring low power and small form factor.
• Industrial data acquisition systems utilizing serial communication.
• Battery-operated hand-held devices benefiting from power-down capabilities.
• Subsampling applications due to high full-power bandwidth.

Procurement Notes

Verify the specific ordering suffix REEL7 confirms tape-and-reel packaging when sourcing. Confirm that the AD7898-3 designation matches the required ±2.5 V input range for your application. Ensure the component version meets environmental compliance requirements if RoHS status is critical for your manufacturing process.

Selection Notes

Select this model specifically for its ±2.5 V input voltage range; use the AD7898-10 variant for ±10 V inputs. Consider Mode 1 operation if external clock synchronization or power-down functionality is required. Verify that the system can accommodate the 3.3 µs conversion time or adjust timing for the external clock mode constraints.

Part Context

This component belongs to the AD7898 family of fast, 12-bit ADCs manufactured by Analog Devices. The family includes variants with different input ranges, such as the AD7898-10 for ±10 V signals. All members share the same 8-lead SOIC package and core architecture, differing primarily in analog input scaling and specific ordering suffixes for packaging or lead-free compliance.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Designers should verify pin compatibility and electrical specifications carefully when considering alternative ADCs from other manufacturers.