AS1525-BTDR

Analog To Digital Converters (ADC) Overview

The AS1525-BTDR is a low-power, 12-bit analog-to-digital converter (ADC) featuring two single-ended input channels. It utilizes a successive-approximation register (SAR) architecture and operates on a single +2.7V to +5.25V supply. The device supports a maximum sampling rate of 150ksps with an internal conversion clock. Power consumption ranges from 350µA at full speed to 200nA in automatic shutdown mode between conversions. Data access is provided via a 3-wire SPI-/QSPI-/MICROWIRE-compatible serial interface. The component is housed in an 8-pin TDFN (3x3mm) package.

Analog To Digital Converters (ADC) Feature Summary

• 12-bit resolution with 150ksps sampling rate
• Two single-ended analog input channels
• Automatic shutdown mode consuming <0.2µA
• 3-wire SPI/QSPI/MICROWIRE compatible serial interface
• Single-supply operation (+2.7V to +5.25V)

Analog To Digital Converters (ADC) Applications

• Portable battery-powered data-acquisition systems
• Remote sensor interfaces
• Data logging devices
• Lab instruments

Analog To Digital Converters (ADC) Procurement Notes

Verify the 'BTDR' suffix against official documentation to confirm specific packaging or tape-and-reel specifications. Ensure the source impedance of analog inputs remains below 300Ω for optimal AC performance, or adjust acquisition time accordingly. Confirm compatibility with the host microcontroller's serial interface timing requirements.

Analog To Digital Converters (ADC) Selection Notes

Select the AS1525-BTDR when two single-ended inputs are required; use the AS1524 variant for pseudo-differential or true-differential applications. Evaluate power constraints, as current draw scales with sampling frequency. Ensure the external reference voltage falls within the specified range of +1V to VDD + 50mV for accurate conversion results.

Analog To Digital Converters (ADC) Part Context

The AS1525 is part of the AS1524/AS1525 family of 12-bit SAR ADCs manufactured by ams-OSRAM USA INC. (formerly austriamicrosystems). This family shares identical electrical characteristics and pinouts, differing primarily in input configuration: the AS1525 provides two single-ended channels, while the AS1524 offers one channel configurable for pseudo-differential or true-differential modes.

Analog To Digital Converters (ADC) Replacement Considerations

The AS1524 serves as a functional alternative if differential input capability is needed instead of dual single-ended channels. Verify that any substitute maintains the 12-bit resolution, 150ksps throughput, and 8-pin TDFN footprint.

Analog To Digital Converters (ADC) FAQ

How is the input channel selected on the AS1525?

Channel selection is managed via the CNVST pin. Driving CNVST high selects AIN1, while driving it low and then high again selects AIN2.

What is the maximum serial clock frequency?

The maximum serial clock frequency (fSCLK) is 8 MHz.

How does the device handle power consumption between conversions?

The AS1525 features automatic shutdown mode, reducing current consumption to less than 0.2µA between conversions when CNVST is held low.