AD7989-5BCPZ-RL7

Overview

The AD7989-5BCPZ-RL7 is an 18-bit successive approximation analog-to-digital converter (ADC) from the PulSAR family, manufactured by Analog Devices Inc. It operates with a single 2.5 V supply and supports 1.8 V to 5 V logic interfaces via a separate VIO pin. The device features a true differential analog input range of ±VREF or 0 V to VREF, where VREF ranges from 2.4 V to 5.1 V. It offers a throughput of 500 kSPS with zero latency architecture and no missing codes. Power dissipation is 3.5 mW at full throughput, scaling down to 70 µW at 10 kSPS. It is housed in a 10-lead LFCSP package and specified for operation between −40°C and +85°C.

Feature Summary

• Zero latency architecture with immediate data availability after conversion completion.
• True differential analog inputs supporting ±VREF or 0 V to VREF ranges.
• Proprietary serial interface compatible with SPI, QSPI, MICROWIRE, and DSP protocols.
• Daisy-chain capability allowing multiple ADCs to connect to a single bus.

Applications

• Automated test equipment
• Data acquisition systems
• Medical instruments
• Machine automation

Procurement Notes

Verify the specific suffix RL7 indicates reel packaging when sourcing. Confirm the BC designation corresponds to the commercial temperature range of −40°C to +85°C. Ensure the LFCSP-10 package variant matches the required PCB footprint. Cross-reference the manufacturer part number with official Analog Devices documentation to confirm current production status and revision level.

Selection Notes

Select this component for applications requiring high resolution and low power consumption. The 500 kSPS speed suits moderate-speed data acquisition needs. Consider the external reference voltage requirements and the separate digital supply voltage for logic compatibility. Evaluate the thermal performance based on the specific PCB layout and ambient operating conditions.

Part Context

This part belongs to the AD7989 series, which includes the AD7989-1 variant offering 100 kSPS throughput. Both share identical 18-bit resolution and architectural features but differ in sampling speed and power consumption profiles. The series utilizes the PulSAR SAR ADC technology designed for precision measurement applications.

Replacement Considerations

The AD7989-1BCPZ-RL7 is a pin-compatible alternative within the same family, offering reduced throughput of 100 kSPS and lower power consumption. Other 18-bit PulSAR ADCs may require circuit redesign due to differences in interface timing or pin configurations.