AS1531

Analog To Digital Converters (ADC) Overview

The AS1531 is a low-power, 8-channel, 12-bit analog-to-digital converter (ADC) designed for single-supply operation. It features a sampling rate of 300ksps and operates within a supply voltage range of +2.7V to +3.6V. The device integrates an internal 2.5V reference with an integrated buffer and supports external references from 1V to VDD. It employs a successive-approximation register (SAR) architecture with high-bandwidth track/hold circuitry. Power consumption is 2.2mA at full speed, reducible to 0.4mA in reduced-power mode or 0.5µA in power-down mode. Data access is facilitated via a high-speed, 4-wire serial interface compatible with SPI, QSPI, and Microwire protocols.

Analog To Digital Converters (ADC) Feature Summary

• 12-bit resolution with 300ksps sampling rate
• Single-supply operation (+2.7V to +3.6V)
• Internal 2.5V reference with software-configurable input types (single-ended, pseudo-differential, fully differential)
• Low current consumption: 2.2mA normal, 0.4mA reduced-power, 0.5µA power-down
• SPI/QSPI/Microwire/TMS320-compatible serial interface

Analog To Digital Converters (ADC) Applications

• Remote sensors
• Data-acquisition devices
• Data-logging devices
• Pen-digitizers
• Process control systems

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to ensure correct package type and temperature range. Confirm that the component source matches the original manufacturer specifications. Check for RoHS compliance status if required by the application environment. Ensure the datasheet revision aligns with the ordered part number to avoid discrepancies in electrical characteristics.

Analog To Digital Converters (ADC) Selection Notes

Select the AS1531 when a 12-bit ADC with 300ksps throughput is required under a single 3.3V supply. Choose this model over the AS1530 if lower voltage operation is necessary, as the AS1530 requires 4.5V to 5.5V. Consider the internal 2.5V reference for simplified design, or disable it via REFADJ for external reference integration. Ensure the serial interface timing meets the system clock requirements, specifically the 4.8MHz maximum SCLK frequency.

Analog To Digital Converters (ADC) Part Context

The AS1531 belongs to the AS1530/AS1531 family of 12-bit A/D converters manufactured by AMS (now ams-OSRAM). These devices are engineered for battery-powered applications requiring high reliability and small form factors. They share identical pinouts and architectural features, differing primarily in supply voltage ranges and maximum sampling rates. The family utilizes a 20-pin TSSOP package.

Analog To Digital Converters (ADC) Replacement Considerations

The AS1530 is a direct functional alternative within the same package, suitable for designs operating at 4.5V to 5.5V with a higher 400ksps sampling rate. Verify compatibility regarding supply voltage levels and clock frequencies when substituting.