AD4129-8BCBZ-RL7

Analog To Digital Converters (ADC) Overview

The AD4129-8BCBZ-RL7 is an ultra-low power, 16-bit Sigma-Delta analog-to-digital converter (ADC) with an integrated analog front end (AFE). It features a programmable gain amplifier (PGA), on-chip reference, oscillator, and a 256-sample FIFO buffer. The device supports up to eight single-ended or four differential inputs via a crosspoint multiplexer. Key electrical parameters include a supply voltage range of 1.71 V to 3.6 V for AVDD and 1.65 V to 3.6 V for IOVDD. RMS noise is specified at 25 nV rms at 1.17 SPS with gain set to 128. Output data rates range from 1.17 SPS to 2.4 kSPS. The component operates within a temperature range of −40°C to +125°C.

Analog To Digital Converters (ADC) Feature Summary

• Ultra-low current consumption: 32 µA in continuous conversion mode (gain = 128), 5 µA in duty cycling mode (ratio = 1/16), and 0.1 µA in power-down mode.
• Integrated 256-sample FIFO buffer with autonomous interrupt functionality based on threshold detection or sample count.
• Smart sequencer allowing configuration of up to sixteen channels with independent ADC setups, minimizing host processor load.
• Built-in sensor interfacing including matched excitation currents for RTDs, bias voltage generator for thermocouples, and low-side power switch for bridge transducers.

Analog To Digital Converters (ADC) Applications

• Smart transmitters
• Wireless battery and harvester powered sensor nodes
• Portable instrumentation
• Temperature measurement using thermocouples, RTDs, and thermistors
• Pressure measurement using bridge transducers

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific ordering suffix BCBZ corresponds to the 35-ball WLCSP package variant when sourcing. Confirm that the RL7 suffix indicates reel packaging. Ensure compatibility with the required operating temperature range of −40°C to +125°C for the LFCSP version if pin compatibility with AD7124-8 is required, noting that the WLCSP variant has a −40°C to +105°C rating.

Analog To Digital Converters (ADC) Selection Notes

Select this component for applications requiring extended battery life due to its ultra-low power modes and duty cycling capabilities. The integrated FIFO and smart sequencer are suitable for systems where the microcontroller needs to remain in sleep mode for extended periods. Ensure the input signal range fits within the PGA limits and that the required output data rate aligns with the selected filter options (Sinc3, Sinc4, or Averaging).

Analog To Digital Converters (ADC) Part Context

The AD4129-8 is part of the AD4129 family of ultra-low power ADCs. It is designed as a complete measurement solution for low-bandwidth, battery-operated applications. The device integrates functions typically found in separate components, such as the PGA, reference, and oscillator, into a single chip to reduce board space and system complexity.

Analog To Digital Converters (ADC) Replacement Considerations

The AD4129-8 LFCSP package is pin-compatible with the AD7124-8 LFCSP. Verify package type (WLCSP vs. LFCSP) and temperature range when considering substitutes, as these factors affect physical fit and operational limits.