AD1556ASZ

Overview

The AD1556ASZ is a digital FIR filter and decimator designed to pair with the AD1555 sigma-delta modulator. It converts the modulator's bitstream into a 24-bit parallel or serial output word. The device supports output data rates from 250 SPS to 16 kSPS, selected via hardware pins or software configuration. Operating on a single 3.3 V or 5 V supply, it dissipates 6.2 mW typically at 1 kHz output rate and 8.5 mW maximum. It features low standby power of 70 µW and includes error flagging for overrange conditions.

Feature Summary

• FIR Digital Filter/Decimator for 24-bit Sigma-Delta Modulators
• Programmable Output Rates: 250 SPS to 16 kSPS
• Low Power Dissipation: 6.2 mW Typical (VL = 3.3 V)
• Hardware or Software Configuration Control

Applications

• Seismic Data Acquisition Systems
• Chromatography
• Automatic Test Equipment

Procurement Notes

Verify the specific suffix 'SZ' against the manufacturer's current ordering guide to confirm lead-free status and RoHS compliance. Confirm package availability in MQFP-44 format. Check for any product change notices regarding pinout or electrical specifications updates.

Selection Notes

Select this component when paired with an external sigma-delta modulator like the AD1555. Ensure the system requires a 24-bit resolution with programmable bandwidths up to 16 kSPS. Verify that the host microcontroller can interface with the serial or parallel data output modes supported by the device.

Part Context

The AD1556ASZ belongs to the AD1555/AD1556 chipset family. While the AD1555 handles analog front-end modulation, the AD1556 provides the digital filtering stage. This separation allows for optimized performance in high-dynamic-range applications requiring precise low-frequency signal processing.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.