AD7854LARS

Overview

The AD7854LARS is a 12-bit, single-channel Analog-to-Digital Converter (ADC) manufactured by Analog Devices Inc. It utilizes a Successive Approximation Register (SAR) architecture and operates from a single 3 V to 5.5 V supply. The device features a pseudo-differential input range of 0 V to VREF (unipolar) or ±VREF/2 (bipolar). It supports a maximum throughput rate of 100 kSPS with a track-and-hold acquisition time of 500 ns. Power consumption is typically 5.5 mW in normal operation at 3 V and drops to 650 µW at 10 kSPS. The component is housed in a 28-lead SSOP package.

Feature Summary

• Low power optimization for battery-powered applications
• Integrated self-calibration and system calibration capabilities
• Flexible parallel interface supporting byte-mode data access

Applications

• Battery-powered medical instruments
• Mobile communications systems
• Instrumentation and control systems

Procurement Notes

Verify the specific suffix 'RS' indicates the 28-lead Shrink Small Outline Package (SSOP) variant. Confirm the temperature grade corresponds to the commercial range (-40°C to +85°C). Ensure the ordering code matches the low-power L version specifications rather than the standard speed version.

Selection Notes

Select this model when a 100 kSPS sampling rate is sufficient for the application. Choose this part over the standard AD7854 if lower power dissipation is required during normal operation. Verify that the system can accommodate the 28-lead SSOP footprint and parallel bus requirements.

Part Context

This component belongs to the AD7854 family of high-speed, low-power 12-bit ADCs. The 'L' designation identifies it as the low-power optimized version, while the 'RS' suffix specifies the SSOP package type. It shares architectural similarities with the AD7854 but targets different performance trade-offs regarding speed versus power consumption.

Replacement Considerations

The AD7854LAR serves as the non-package-specific equivalent. For higher speed requirements, the AD7854 series may be considered, though power characteristics will differ.