AS1533-T

Analog To Digital Converters (ADC) Overview

The AS1533 is a low-power, single-supply, 4-channel, 12-bit analog-to-digital converter (ADC) designed for battery-powered remote-sensor and data-acquisition devices. It operates from a +2.7V to +3.6V supply with a sampling rate of 300ksps. The device features a successive-approximation register (SAR), high-speed track/hold circuitry, and an internal 2.5V reference. Normal operation consumes 2.2mA at 300ksps, reducing to 0.4mA in reduced-power mode and 0.5µA in full power-down mode. Data access is via a high-speed, 4-wire SPI/QSPI/Microwire-compatible serial interface.

Analog To Digital Converters (ADC) Feature Summary

• Single-supply operation (+2.7V to +3.6V) with 300ksps sampling rate
• Software-configurable analog input types: 4-channel single-ended, pseudo-differential, or fully differential
• Internal +2.5V reference with external reference support (1V to VDD)
• Low-current operation: 2.2mA normal, 0.4mA reduced-power, 0.5µA power-down

Analog To Digital Converters (ADC) Applications

• Remote sensors
• Data-acquisition and 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 confirm package type and temperature range. Ensure the design supports the required single-supply voltage range of +2.7V to +3.6V. Confirm compatibility with the SPI/QSPI/Microwire serial interface timing requirements before integration.

Analog To Digital Converters (ADC) Selection Notes

Select the AS1533 when a 12-bit resolution and 300ksps throughput are sufficient for the application. Choose this part over the AS1532 if the system operates on lower voltage supplies (+2.7V to +3.6V vs +4.5V to +5.5V). Consider the reduced-power mode for applications requiring extended battery life during idle periods.

Analog To Digital Converters (ADC) Part Context

The AS1533 is part of the AS1532/AS1533 family of 12-bit A/D converters. It shares the same architecture and pinout as the AS1532 but is optimized for lower voltage operation. Both devices are housed in a 16-pin TSSOP package and are designed for space-limited applications requiring low power consumption.

Analog To Digital Converters (ADC) Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided datasheet. Designers should consult the manufacturer for direct replacements or cross-reference compatible 12-bit SAR ADCs with similar voltage and speed specifications.

Analog To Digital Converters (ADC) FAQ

What is the maximum input voltage range for the analog channels?

The absolute voltage range for the analog inputs (CH0:CH3 and COM) is from GND to VDD1. For accurate conversions near full scale, inputs must not exceed VDD1 by more than 50mV.

How is the internal reference disabled for external reference use?

To disable the internal reference buffer and use an external reference, tie the REFADJ pin to VDD1. The external reference voltage should be applied to the REF pin.

What is the acquisition time for the AS1533?

The acquisition time (tACQ) for the AS1533 is typically 520ns in normal operation. It is calculated based on the source impedance and input capacitance using the formula tACQ = 9(RS + RIN)18pF.