ADC122S101CIMMX

Analog To Digital Converters (ADC) Overview

The ADC122S101 is a low-power, two-channel, 12-bit analog-to-digital converter featuring a successive-approximation register architecture with an internal track-and-hold circuit. It operates over a sample rate range of 500 ksps to 1 Msps and accepts a single supply voltage from 2.7V to 5.25V. The device provides a high-speed serial interface compatible with SPI, QSPI, Microwire, and DSP standards. Typical power consumption is 4.3 mW at 3V and 13.1 mW at 5V. Key electrical specifications include a typical Signal-to-Noise Ratio (SNR) of 72.4 dB, Integral Non-Linearity (INL) of ±0.64 LSB, and Differential Non-Linearity (DNL) of +0.9/-0.6 LSB.

Analog To Digital Converters (ADC) Feature Summary

• Two input channels (IN1, IN2) with configurable multiplexer selection via the control register.
• Fully specified performance over a variable sample rate range of 500 ksps to 1 Msps.
• Low power consumption with a shutdown mode reducing current to 38 nA at 3.6V.
• Straight binary output coding compatible with standard digital interfaces.

Analog To Digital Converters (ADC) Applications

• Portable battery-powered systems requiring low power consumption.
• Remote data acquisition networks.
• Instrumentation and control systems.

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific package variant against the required footprint, as the datasheet specifies the 8-lead VSSOP (DGK) package. Confirm that the application environment stays within the industrial temperature range of -40°C to +85°C. Ensure the analog supply voltage remains between 2.7V and 5.25V to maintain guaranteed electrical characteristics. Check for pin-compatible alternatives if different resolution or speed requirements arise within the same family.

Analog To Digital Converters (ADC) Selection Notes

Select this component when a 12-bit resolution is required at sampling rates up to 1 Msps with dual-channel capability. It is suitable for designs where power efficiency is critical, offering significant reduction in shutdown mode. Consider the 8-lead VSSOP package constraints regarding thermal resistance (250°C/W) and board space. Verify that the system clock frequency can support the required 8 MHz to 16 MHz SCLK range for optimal performance.

Analog To Digital Converters (ADC) Part Context

The ADC122S101 belongs to the ADC122Sxx1 series of 12-bit converters. Pin-compatible alternatives exist within the Texas Instruments portfolio, such as the ADC122S051 (200-500 ksps) and ADC122S021 (50-200 ksps), allowing for design flexibility based on specific throughput needs without changing the PCB layout.

Analog To Digital Converters (ADC) Replacement Considerations

Pin-compatible substitutes include the ADC122S051 and ADC122S021. These devices share the same 8-lead VSSOP footprint and function but are specified for lower maximum sample rates of 500 ksps and 200 ksps, respectively.

Analog To Digital Converters (ADC) FAQ

How is the input channel selected for conversion?

Channel selection is controlled by bits ADD2, ADD1, and ADD0 in the control register. Setting ADD1=0 and ADD0=0 selects IN1, while ADD1=0 and ADD0=1 selects IN2. The value of ADD2 is don't care.

What is the power consumption in shutdown mode?

In shutdown mode (CS high), the supply current drops to 38 nA at a 3.6V supply and 60 nA at a 5.25V supply, resulting in power consumption of approximately 0.14 µW to 0.32 µW.

Can the ADC122S101 operate with a clock frequency below 8 MHz?

While the device is functional over a wider range, the electrical performance is only ensured for a serial clock (fSCLK) frequency between 8 MHz and 16 MHz.