AS1542-BTSU

Analog To Digital Converters (ADC) Overview

The AS1542 is a 12-bit, high-speed successive-approximation analog-to-digital converter (ADC) featuring 16 single-ended or 8 fully-differential analog inputs. It operates from a single 2.7V to 5.25V supply and achieves throughput rates of up to 1 Msps with low power consumption. The device integrates a channel sequencer, track-and-hold amplifier, and serial interface for direct connection to microprocessors. Key electrical specifications include a maximum conversion time of 800 ns at a 20 MHz clock, an input common-mode voltage range dependent on configuration, and a shutdown current of 0.5 µA. It is housed in a TSSOP-28 package.

Analog To Digital Converters (ADC) Feature Summary

• 16-channel single-ended or 8-channel fully-differential analog inputs with software-configurable ranges
• High throughput rate of 1 Msps with no pipeline delays
• Integrated channel sequencer and counter for automated multi-channel scanning
• Flexible power management with normal mode currents of 2.8 mA (@3.6V) and 3.5 mA (@5.25V)
• SPI/QSPI/Microwire/DSP compatible serial interface

Analog To Digital Converters (ADC) Applications

• Remote sensor data acquisition systems
• Portable data-logging devices
• Pen-digitizers
• Process control instrumentation
• Space-limited A/D applications requiring low power

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm package type and temperature grade. Ensure that the external reference voltage applied to REFIN is within the specified 2.5V ±1% tolerance for optimal performance. Confirm that the VDRIVE logic supply does not exceed the VDD supply voltage during operation.

Analog To Digital Converters (ADC) Selection Notes

Select this component when a 12-bit resolution and 1 Msps sampling rate are required for multi-channel signal conditioning. Ensure the application supports a single supply voltage between 2.7V and 5.25V. For differential input requirements, verify that the supply voltage meets the minimum threshold relative to the reference voltage if using the full-scale differential range. Consider the TSSOP-28 package constraints for PCB layout.

Analog To Digital Converters (ADC) Part Context

The AS1542 belongs to the Austriamicrosystems (now ams OSRAM) family of high-speed SAR ADCs. It is designed to replace older parallel ADCs in space-constrained designs by integrating multiplexing and sequencing capabilities into a compact serial interface package. The device is part of a broader portfolio of mixed-signal converters aimed at industrial and consumer electronics.

Analog To Digital Converters (ADC) Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. When evaluating alternatives, ensure compatibility with the 2.7V–5.25V supply range, 12-bit resolution, 1 Msps throughput, and TSSOP-28 footprint.