AS1520-T

Analog To Digital Converters (ADC) Overview

The AS1520-T is a 10-bit, 8-channel analog-to-digital converter (ADC) utilizing successive-approximation register (SAR) architecture. Designed for single-supply operation, it supports a supply voltage range of +4.5V to +5.5V with a typical sampling rate of 400ksps and a supply current of 2.8mA. The device features an internal 2.5V reference, software-configurable input types including single-ended and differential modes, and a high-speed 4-wire SPI-compatible serial interface. It is housed in a 20-pin TSSOP package.

Analog To Digital Converters (ADC) Feature Summary

• 10-bit resolution with 8 multiplexed analog inputs
• Sampling rates up to 400ksps at 2.8mA supply current
• Software-selectable input configurations: Single-Ended, Pseudo-Differential, or Fully Differential
• Integrated 2.5V reference buffer with external reference support
• SPI/QSPI/Microwire/TMS320-compatible serial interface

Analog To Digital Converters (ADC) Applications

• Battery-powered remote sensor systems
• Portable data-acquisition and data-logging devices
• Pen-digitizers
• Process control instrumentation

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific suffix 'T' against the manufacturer's official ordering information to confirm tape-and-reel packaging status. Ensure the selected variant matches the required +4.5V to +5.5V supply voltage range, as distinct part numbers exist for lower voltage operations.

Analog To Digital Converters (ADC) Selection Notes

Select this component for applications requiring low power consumption and flexible analog input configurations. Consider the 390ns acquisition time when interfacing with high-impedance signal sources. Verify compatibility with the host microcontroller's SPI clock polarity and phase requirements before integration.

Analog To Digital Converters (ADC) Part Context

The AS1520-T belongs to the AS1520/AS1521 family of low-power ADCs. While the AS1520 operates on +4.5V to +5.5V supplies at 400ksps, the AS1521 variant supports +2.7V to +3.6V supplies at 300ksps. Both share identical pinouts and functional architectures within the 20-pin TSSOP package.

Analog To Digital Converters (ADC) Replacement Considerations

Direct replacements must maintain 10-bit resolution, 8 channels, and SAR architecture. Verify that alternative components support the same +4.5V to +5.5V supply range and 400ksps throughput if performance parity is required.

Analog To Digital Converters (ADC) FAQ

What are the supported analog input configurations?

The device supports software-configurable modes including 8-channel single-ended, 8-channel pseudo-differential referenced to COM, 4-channel pseudo-differential, and 4-channel fully differential inputs.

How is the internal reference voltage adjusted?

The internal 2.5V reference can be externally adjusted via the REFADJ pin. For small adjustments, the input range is from 1.22V ±100mV. Pulling REFADJ to VDD1 disables the internal buffer for external reference use.

What is the maximum allowable analog input voltage?

The absolute voltage range for analog inputs (CH0:CH7, COM) is from GND to VDD1. For accurate conversions near full scale, inputs should not exceed VDD1 by more than 50mV or go below GND by 50mV.