AD7853BNZ

Overview

The AD7853BNZ is a 12-bit, 200 kSPS successive approximation analog-to-digital converter (ADC) from Analog Devices. It operates on a single 3 V to 5.5 V supply and features a pseudo-differential input range of 0 V to VREF. The device includes an internal 2.5 V reference, self-calibration capabilities, and flexible serial interfaces compatible with SPI, QSPI, and 8051 systems. Power consumption is typically 12 mW at 3 V in normal mode, with automatic power-down reducing dissipation to 25 mW after conversion. It is housed in a 24-lead plastic DIP package.

Feature Summary

• Integrated self-calibration and system calibration options ensure accuracy over time and temperature variations.
• Flexible serial interface supports multiple communication protocols including SPI, QSPI, and microprocessor modes.
• Automatic power-down functionality minimizes energy consumption following each conversion cycle.
• Pseudo-differential sampling scheme allows for versatile analog input signal conditioning.

Applications

• Battery-powered portable systems such as personal digital assistants and mobile communications devices
• Medical instrumentation requiring precise low-power data acquisition
• High-speed modem applications utilizing fast sampling rates

Procurement Notes

Verify the specific suffix BNZ indicates the B-grade linearity performance and the N-24 plastic DIP package configuration. Confirm that the component meets RoHS standards if required by your manufacturing process. Ensure the operating voltage range aligns with your system's 3 V to 5.5 V supply rails. Check for any obsolescence notices or alternative package recommendations from the manufacturer.

Selection Notes

Select the AD7853BNZ when high throughput up to 200 kSPS is required alongside low power consumption. Consider this part for designs needing integrated calibration to reduce external component count. Evaluate the 24-lead DIP package availability against your PCB layout constraints. Compare the B-grade linearity specifications against application requirements for integral nonlinearity errors.

Part Context

The AD7853 series comprises high-speed, low-power 12-bit ADCs optimized for single-supply operation. The AD7853 variant focuses on maximum speed, while the AD7853L offers lower power consumption. Both share similar architectures but differ in clock speeds and power profiles. This family supports various packaging options to accommodate different board space requirements.

Replacement Considerations

The AD7853ANZ serves as a comparable A-grade alternative within the same family. For lower power requirements, the AD7853L series provides reduced current consumption at the cost of lower maximum throughput. Verify pin compatibility and software register configurations when substituting these variants.