AD7853LBRZ

Overview

The AD7853LBRZ is a 12-bit, single-channel Analog-to-Digital Converter (ADC) from Analog Devices Inc., optimized for low power consumption. It operates on a single 3 V to 5.5 V supply and supports a maximum throughput rate of 100 kSPS. The device features a pseudo-differential input range of 0 to VREF or bipolar ±VREF/2, with straight binary or two's complement output coding. Key specifications include a typical Signal-to-Noise Ratio (SNR) of 71 dB min, Total Harmonic Distortion (THD) of -78 dB max, and Integral Nonlinearity (INL) of ±1 LSB max at 5 V. Power dissipation is typically 4.5 mW in normal mode and drops to 1.15 mW in power-down mode.

Feature Summary

• Low power optimization with automatic power-down after conversion
• System and self-calibration capabilities with autocalibration on power-up
• Flexible serial interface compatible with SPI, QSPI, 8051, and µP protocols

Applications

• Battery-powered systems such as personal digital assistants and mobile communications
• Medical instruments requiring precise data acquisition
• Pen computers and portable instrumentation
• Instrumentation and control systems

Procurement Notes

Verify the specific suffix BRZ indicates the SOIC-24 package and RoHS compliance when sourcing. Confirm the L variant designation ensures the 100 kSPS speed grade rather than the standard 200 kSPS version. Check manufacturer documentation for current lifecycle status and temperature range grades.

Selection Notes

Select the AD7853LBRZ over the standard AD7853 when system power constraints are critical, as it offers significantly lower power dissipation. Ensure the application requires a maximum sampling rate of 100 kSPS. Verify that the 12-bit resolution and pseudo-differential input architecture meet the signal conditioning requirements.

Part Context

This component belongs to the AD7853 family of high-speed, low-power ADCs. The 'L' suffix denotes the low-power optimized version, while 'B' indicates the industrial temperature grade (-40°C to +85°C). The 'RZ' suffix specifies the surface-mount SOIC package and lead-free construction.

Replacement Considerations

AD7853BRZ is the higher-speed 200 kSPS equivalent in the same package. AD7853LARSZ is the SSOP package alternative for the low-power variant.