TSM1285BCSA+T

Analog To Digital Converters (ADC) Overview

The TSM1285BCSA+T is a single-supply, single-channel, 12-bit analog-to-digital converter (ADC) manufactured by Silicon Labs. It operates within a voltage range of +2.7V to +3.6V and features an internal +2.5V reference and track-and-hold circuit. The device supports a sampling rate of 300ksps with a full-power bandwidth of 3 MHz. Electrical specifications include ±1 LSB maximum DNL and INL, and a conversion time of 3.3 μs. It utilizes a 3-wire serial interface compatible with SPI, QSPI, and MICROWIRE standards. The component is housed in an 8-pin SOIC package and is specified for operation from 0°C to +70°C.

Analog To Digital Converters (ADC) Feature Summary

• Single-supply operation (+2.7V to +3.6V) with low power consumption (2.5mA at 300ksps).
• Integrated 12-bit SAR ADC with internal +2.5V reference and track-and-hold.
• High accuracy with ±1 LSB max DNL/INL and 300ksps sampling rate.
• Compatible with SPI, QSPI, and MICROWIRE serial interfaces via 3-wire connection.

Analog To Digital Converters (ADC) Applications

• Process control and factory automation systems.
• Portable data logging devices.
• Medical instrumentation.
• Battery-powered instruments.
• Pen digitizers and tablet computers.

Analog To Digital Converters (ADC) Procurement Notes

Verify the ordering suffix '+T' indicates tape and reel packaging containing 2500 units, distinct from the tube-packaged variant. Confirm the 'BC' suffix corresponds to the commercial temperature range of 0°C to +70°C. Ensure compatibility with existing PCB footprints for the 8-pin SOIC package. Check for end-of-life status or alternative sourcing requirements as this component may be discontinued.

Analog To Digital Converters (ADC) Selection Notes

Select the TSM1285BCSA+T when a 12-bit resolution and 300ksps speed are required for single-ended input signals. Choose this part over the BE variant if the application environment remains within the 0°C to +70°C range. Consider the internal 2.5V reference capability to reduce external component count. Ensure the system microcontroller supports the required 3-wire serial protocol up to 4.8MHz clock speeds.

Analog To Digital Converters (ADC) Part Context

The TSM1285 series serves as an alternate source for the Maxim Integrated MAX1285 and offers a higher-speed upgrade path compared to the MAX1240 and MAX1241 ADCs. The BC version specifically targets commercial applications, while the BE version covers industrial temperatures. Both share identical electrical characteristics but differ in operating temperature ranges and packaging quantities.

Analog To Digital Converters (ADC) Replacement Considerations

The TSM1285BCSA+T is functionally equivalent to the Maxim Integrated MAX1285BCSA+. Designers upgrading from MAX1240 or MAX1241 should verify pinout compatibility and interface timing differences. No other direct cross-model substitutes are documented in the provided datasheet.

Analog To Digital Converters (ADC) FAQ

What is the minimum acquisition time for the TSM1285?

The minimum acquisition time (tACQ) is 625 ns, calculated based on the internal switch resistance and input capacitance.

How does the SHDN pin affect power consumption?

Driving the SHDN pin low shuts down the ADC, reducing the supply current to approximately 2μA. The internal reference is disabled during shutdown.

What is the recommended bypass capacitor value for the REF pin?

A 4.7μF capacitor is recommended between the REF pin and GND to maintain conversion accuracy within 1 LSB.