AS1538-BTSU

Analog To Digital Converters (ADC) Overview

The AS1538-BTSU is a single-supply, low-power 12-bit Analog-to-Digital Converter (ADC) manufactured by ams-OSRAM USA INC. It features an 8-channel multiplexer and a serial I²C interface supporting high-speed operation up to 3.4MHz. The device integrates a sample-and-hold amplifier, an internal asynchronous clock, and a 2.5V internal reference. Operating within a supply voltage range of 2.7V to 5.25V, it delivers a sampling rate of 50kSPS with no missing codes. The component is housed in a TSSOP-16 package and is designed for applications requiring data acquisition close to the input source.

Analog To Digital Converters (ADC) Feature Summary

• 12-bit resolution with 8-channel analog multiplexer
• High-speed I²C interface operating at frequencies up to 3.4MHz
• Integrated 2.5V internal reference and sample-and-hold amplifier
• Low power consumption with <1.5µA full shutdown current

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 that the ordering suffix 'BTSU' corresponds to the TSSOP-16 package variant as specified in the datasheet. Confirm the manufacturer is ams-OSRAM USA INC. Ensure the component meets the specified electrical characteristics for the -40°C to +85°C operating temperature range. Check for RoHS compliance status if required by the assembly process.

Analog To Digital Converters (ADC) Selection Notes

Select the AS1538-BTSU when an 8-channel input is required; the AS1540 variant offers only 4 channels. Ensure the system supports I²C high-speed mode (up to 3.4MHz) for optimal throughput. Verify that the analog input signals remain within the absolute input range of -0.3V to VDD + 0.3V. Consider the internal 2.5V reference drift of 30 ppm/°C if precise temperature stability is critical without external calibration.

Analog To Digital Converters (ADC) Part Context

The AS1538 is part of the AS1538/AS1540 family of 12-bit SAR ADCs from ams AG (now ams-OSRAM). These devices utilize capacitive redistribution architecture for successive approximation conversion. The AS1538 specifically provides 8 analog inputs, whereas the AS1540 provides 4. Both share identical core specifications regarding resolution, speed, and interface protocols.

Analog To Digital Converters (ADC) Replacement Considerations

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