AD7898ARZ-3

Overview

The AD7898ARZ-3 is a 12-bit successive approximation analog-to-digital converter 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 low power consumption at a maximum of 22.5 mW, it supports bipolar input ranges of ±2.5 V. The component includes two operating modes: Mode 0 utilizes an internal clock triggered by CONVST, while Mode 1 uses an external SCLK and offers a power-down capability.

Feature Summary

• Single 5 V supply operation with low power consumption of 22.5 mW maximum.
• High-speed serial interface allowing direct connection to 3 V processor systems.
• On-chip track/hold amplifier and internal clock oscillator for simplified design.
• Flexible dual-mode operation supporting both internal and external clocking.

Applications

• Portable or hand-held applications requiring low power consumption.
• Data acquisition systems interfacing with 3 V microprocessors.
• Subsampling applications utilizing high full-power bandwidth.

Procurement Notes

Verify that the specific part number suffix corresponds to the required input voltage range and lead-free status. Confirm the ordering guide indicates the 'Z' suffix denotes a Pb-Free component. Ensure the selected variant matches the necessary linearity error and SNR specifications for the intended application environment.

Selection Notes

Select the AD7898ARZ-3 when a 12-bit resolution and 220 kSPS throughput are required within an 8-lead package. Choose this model over the AD7898-10 if the application involves signal levels within the ±2.5 V range rather than ±10 V. Consider the power-down mode availability in Mode 1 for battery-operated designs.

Part Context

The AD7898 series represents Analog Devices' fast 12-bit ADC solutions designed for space-constrained environments. The ARZ-3 variant specifically addresses applications needing lower input voltage ranges compared to the -10 version. It integrates signal scaling, track/hold, and conversion logic into a compact form factor, reducing board space requirements relative to discrete alternatives.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.