AS1545

Analog To Digital Converters (ADC) Overview

The AS1545 is a dual, 12-bit, 6-channel, 1 MSPS successive approximation register (SAR) analog-to-digital converter. It integrates two ADCs, each preceded by a 6-channel multiplexer and a high-bandwidth track/hold amplifier. The device operates on a single +2.7V to +5.25V supply with a maximum sampling rate of 1 MSPS. Key electrical parameters include a typical Signal-to-Noise Ratio (SNR) of 72.5 dB, an Integral Nonlinearity (INL) of ±0.99 LSB, and a Differential Nonlinearity (DNL) of ±0.99 LSB. Power consumption reaches 37 mW max at 1 MSPS with 5.25V supplies.

Analog To Digital Converters (ADC) Feature Summary

• Dual 12-bit SAR ADC architecture with 1 MSPS throughput per channel
• Software-configurable analog inputs supporting 12 single-ended, 6 pseudo-differential, or 6 fully differential channels
• Integrated 2.5V internal reference with external reference capability from 1V to VDD
• Motor control registers for difference calculation, quadrature signal phases, direction, and step down counting

Analog To Digital Converters (ADC) Applications

• Encoder feedback in motor control systems
• Current sensing applications
• Motion control such as robotics
• Sonar systems
• Radio frequency identification (RFID)

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 compatibility with system voltage levels, specifically checking that VDRIVE does not exceed AVDD or DVDD by more than 0.3V. Confirm pinout alignment for the 32-lead TQFN package during PCB layout.

Analog To Digital Converters (ADC) Selection Notes

Select this component when simultaneous dual-channel conversion at 1 MSPS is required. The integrated multiplexer allows flexible input configurations, making it suitable for differential sensor interfaces. Consider the low power-down modes if battery life is critical. Verify that the 12-bit resolution meets the system's accuracy requirements for INL and DNL specifications.

Analog To Digital Converters (ADC) Part Context

The AS1545 belongs to the AS15xx series of high-speed SAR ADCs from ams OSRAM. It is designed for portable and remote data-acquisition devices requiring superior AC characteristics and low power consumption. The device replaces discrete ADC solutions by integrating multiplexers, track/hold amplifiers, and reference buffers into a compact 32-lead TQFN package.

Analog To Digital Converters (ADC) Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided datasheet. Consult the manufacturer's obsolescence notices or cross-reference tools for equivalent dual-channel SAR ADCs with similar pinouts and performance metrics.