ADC122S051CIMMX

Analog To Digital Converters (ADC) Overview

The ADC122S051CIMMX is a low-power, two-channel CMOS 12-bit analog-to-digital converter featuring a high-speed serial interface. Based on a successive-approximation register architecture with an internal track-and-hold circuit, it is fully specified over a sample rate range of 200 ksps to 500 ksps. The device operates on a single power supply ranging from +2.7V to +5.25V. Normal power consumption is 3.0 mW at +3V and 10 mW at +5V, while the shutdown mode reduces consumption to 0.14 µW or 0.32 µW respectively. It utilizes an 8-lead VSSOP package.

Analog To Digital Converters (ADC) Feature Summary

• Two input channels (IN1, IN2) with configurable multiplexer selection via control register
• Specified performance across a wide sample rate range of 200 ksps to 500 ksps
• Low power consumption: 3.0 mW typical at 3V; 0.14 µW in shutdown mode
• Compatible with SPI, QSPI, MICROWIRE, and common DSP serial interfaces

Analog To Digital Converters (ADC) Applications

• Portable Systems
• Remote Data Acquisition
• Instrumentation and Control Systems

Analog To Digital Converters (ADC) Procurement Notes

Verify that the component matches the Texas Instruments part number ADC122S051CIMMX. Confirm the package type is 8-lead VSSOP and the operating temperature range is -40°C to +85°C. Ensure the datasheet revision corresponds to SNAS257E for accurate electrical characteristics and timing specifications.

Analog To Digital Converters (ADC) Selection Notes

Select this component when dual-channel 12-bit resolution is required within the 200 ksps to 500 ksps throughput range. It is suitable for applications needing variable power management and compatibility with standard serial protocols. Consider the 8-lead VSSOP package constraints and the requirement for a single supply voltage between 2.7V and 5.25V.

Analog To Digital Converters (ADC) Part Context

The ADC122S051 belongs to the family of low-power, high-speed serial A/D converters from Texas Instruments. It is pin-compatible with other devices in the series such as the ADC122S021 and ADC122S101, which offer different speed resolutions. This specific model targets the mid-range speed segment of the product line.

Analog To Digital Converters (ADC) Replacement Considerations

Pin-compatible alternatives include ADC122S021 (50–200 ksps), ADC122S101 (500 ksps–1 Msps), ADC102S051 (10-bit), and ADC082S051 (8-bit). These devices share the same package and function compatibility but differ in specified sample rate ranges and resolution.

Analog To Digital Converters (ADC) FAQ

How is the input channel selected for conversion?

The input channel is selected by writing to the Control Register via the DIN pin. Bits ADD2, ADD1, and ADD0 determine the channel: 'x00' selects IN1 (default), and 'x01' selects IN2. Setting ADD1 high results in indeterminate output.

What is the structure of the serial data frame?

A serial frame is initiated on the falling edge of CS and must contain an integer multiple of 16 SCLK cycles. Data is clocked out MSB first on DOUT, while new channel selection data is clocked into DIN during the first 8 rising edges of SCLK after CS falls.

Does the device require dummy conversions upon power-up?

No, there are no power-up delays or dummy conversions required. The ADC can sample and convert an input to full conversion immediately following power-up, with the first result corresponding to IN1.