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Product Detailed Parameters
- Description：IC ADC PGA 24BIT LN 44-MQFP
- Series：-
- Mfr：Analog Devices Inc.
- Package：Bag
- Number of Bits：24
- Sampling Rate (Per Second)：256k
- Number of Inputs：-
- Input Type：-
- Data Interface：-
- Configuration：-
- Ratio - S/H:ADC：-
- Number of A/D Converters：1
- Architecture：-
- Reference Type：-
- Voltage - Supply, Analog：-
- Voltage - Supply, Digital：-
- Features：-
- Operating Temperature：-55°C ~ 85°C
- Package / Case：44-QFP
- Supplier Device Package：44-MQFP (10x10)
- Mounting Type：Surface Mount
- Grade：-
- Qualification：-
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Overview
The AD1556AS is a digital filter and decimator designed to pair with the AD1555 sigma-delta modulator, forming a complete 24-bit analog-to-digital converter system. Operating from a single 3.3 V or 5 V supply (VL), it accepts a 1.024 MHz clock input (CLKIN) to generate a 256 kHz modulator clock (MCLK). The device features an FIR digital filter with selectable output word rates ranging from 250 SPS to 16 kSPS. It provides low power dissipation of 6.2 mW typical at 1 kHz output rate and consumes only 70 µW in standby mode. The AD1556AS supports both hardware-controlled and serial interface configuration modes for PGA and filter settings.
Feature Summary
- FIR Digital Filter/Decimator with output rates from 250 SPS to 16 kSPS
- Low Power Dissipation: 6.2 mW typical; 70 µW in standby mode
- Single Supply Operation: VL range of 2.85 V to 5.25 V
- Hardware or Serial Configuration via CB0-CB4 pins and serial interface
Applications
- Seismic Data Acquisition Systems
- Chromatography
- Automatic Test Equipment
Procurement Notes
Verify the suffix 'AS' indicates the –55°C to +85°C temperature grade and S-44A Plastic Quad Flatpack package. Confirm that the order includes the specific reel option if required, as indicated by 'RL' suffixes in the ordering guide. Ensure compatibility with the AD1555 modulator for system integration.
Selection Notes
Select the AD1556AS when paired with the AD1555 modulator for high dynamic range applications requiring 24-bit resolution. Choose this component if the application demands output data rates between 250 SPS and 16 kSPS. Verify that the system can provide the required 1.024 MHz CLKIN signal. Consider the 70 µW standby power consumption for battery-operated remote sensing systems.
Part Context
The AD1556AS is part of the AD1555/AD1556 chipset family from Analog Devices. While the AD1555 handles the analog front-end and modulation, the AD1556AS performs the digital filtering and decimation. Together, they create a high-performance ADC suitable for low-frequency, high-dynamic-range measurements. The AS variant specifically denotes the industrial temperature range and MQFP package.
Replacement Considerations
Public confirmed substitute part numbers are not available in the provided datasheet. The AD1556AS is designed to work exclusively with the AD1555 modulator within this specific chipset architecture. No direct cross-model replacements are documented.
