ADC3908S125IRSMT

Analog To Digital Converters (ADC) Overview

The ADC3908S125IRSMT is a single-channel, 8-bit successive approximation register (SAR) analog-to-digital converter manufactured by Texas Instruments. It supports sampling rates up to 125 MSPS with an ultra-low latency of one clock cycle. The device operates on a single +1.8V supply and features a parallel CMOS interface compatible with DDR or SDR modes. Key electrical specifications include a typical signal-to-noise ratio (SNR) of 49.8 dBFS at 125 MSPS and a power consumption of 61 mW at maximum speed. It integrates a 1.2V internal reference and offers a 150 MHz input bandwidth.

Analog To Digital Converters (ADC) Feature Summary

• Single-channel 8-bit SAR architecture with 125 MSPS sampling rate
• Ultra-low power consumption: 61 mW at 125 MSPS, scaling down to 40 mW at 25 MSPS
• Minimal latency of only one clock cycle for fast control loops
• Integrated 1.2V reference and buffer amplifier supporting differential or single-ended inputs

Analog To Digital Converters (ADC) Applications

• High-speed data acquisition systems requiring low latency
• Portable instrumentation benefiting from ultra-low power operation
• Industrial control loops with tight timing constraints
• Wireless infrastructure receiver front-ends

Analog To Digital Converters (ADC) Procurement Notes

Verify the suffix IRSMT corresponds to the specific package variant (VQFN) and industrial temperature range (-40°C to +105°C). Confirm that the ordering part number matches the single-channel configuration (S) rather than the dual-channel (D) variant. Ensure compatibility with the required 1.8V analog supply and 1.8V/3.3V digital I/O levels during component sourcing.

Analog To Digital Converters (ADC) Selection Notes

Select this model when a single channel is sufficient; use ADC3908D125 for dual-channel requirements. Consider lower speed variants like ADC3908S065 or ADC3908S025 if reduced power consumption is prioritized over the 125 MSPS maximum rate. Verify that the system can provide the necessary 1.25V common-mode voltage for the analog input stage, as it is not internally generated.

Analog To Digital Converters (ADC) Part Context

This component belongs to the ADC3908 family, which includes both single-channel (Sx) and dual-channel (Dx) versions across three speed grades: 25 MSPS, 65 MSPS, and 125 MSPS. All members share pin compatibility and feature an 8-bit resolution with a 32-pin VQFN package. The series is designed for applications demanding high speed within a compact footprint and low power envelope.

Analog To Digital Converters (ADC) Replacement Considerations

Direct pin-compatible replacements within the same family include ADC3908S065 and ADC3908S025 for lower speed/power needs. For dual-channel applications, ADC3908D125 serves as the functional equivalent with an additional channel. No other external cross-model substitutes are confirmed in public documentation.