AS1540-BQFT

Analog To Digital Converters (ADC) Overview

The AS1540-BQFT is a single-supply, low-power, 12-bit Analog-to-Digital Converter (ADC) featuring an I²C serial interface and a 4-channel multiplexer. It integrates a sample-and-hold amplifier, internal asynchronous clock, and a 2.5V internal reference. The device operates on a supply voltage of 2.7V to 5.25V with a sampling rate of 50kSPS. Key electrical parameters include a maximum quiescent current of 950µA at full speed and a shutdown current below 1.5µA. It supports high-speed I²C communication up to 3.4MHz and is housed in a TSSOP-16 or TQFN 4x4 16-pin package.

Analog To Digital Converters (ADC) Feature Summary

• 12-bit resolution with no missing codes and 50kSPS throughput
• Integrated 4-channel analog multiplexer with software-configurable input types
• High-speed I²C interface supporting clock rates up to 3.4MHz
• Internal 2.5V reference with external reference input capability
• Low power consumption: <1.5µA in full shutdown mode

Analog To Digital Converters (ADC) Applications

• Voltage-supply monitoring systems
• Isolated data acquisition circuits
• Transducer interfaces
• Battery-operated portable devices
• Remote data acquisition nodes

Analog To Digital Converters (ADC) Procurement Notes

Verify the ordering suffix 'BQFT' against the manufacturer's official documentation to confirm the specific package type (TSSOP-16 or TQFN) and reel configuration. Ensure the component meets RoHS compliance requirements if applicable to the target assembly process. Cross-reference the datasheet revision to confirm pinout and electrical characteristics match the intended design specifications.

Analog To Digital Converters (ADC) Selection Notes

Select the AS1540-BQFT for applications requiring a 4-channel ADC with minimal external components. The internal 2.5V reference simplifies design when input signals are within the 0V to 2.5V range. For inputs exceeding the internal reference voltage, an external reference must be connected to the REFIN/OUT pin. Ensure the I²C bus master supports high-speed mode (3.4MHz) to achieve optimal data throughput.

Analog To Digital Converters (ADC) Part Context

The AS1540 is part of the AS1538/AS1540 family from ams-OSRAM USA INC. (formerly AMS). While the AS1538 provides an 8-channel multiplexer, the AS1540 is configured for 4 channels. Both share identical architecture, performance metrics, and pinouts, differing only in the number of available analog input channels. This family is designed for cost-effective, low-power data acquisition solutions.

Analog To Digital Converters (ADC) Replacement Considerations

The AS1538 is a functional substitute offering 8 channels instead of 4, maintaining identical electrical characteristics and pin compatibility. Verify that the additional channels do not interfere with board layout constraints. No other direct cross-model replacements are documented in the provided source material.