Texas Instruments ADC124S021CIMM

Overview

ADC124S021 from Texas Instruments is a 12-bit, 4-channel successive-approximation ADC with serial SPI-compatible interface, operating from 2.7V to 5.25V supply and supporting 50–200 ksps sample rates. It integrates internal track-and-hold, straight-binary output, and channel-selectable input multiplexing (IN1–IN4), enabling compact data acquisition in portable instrumentation.

For engineers reviewing the ADC124S021 datasheet, ADC124S021 pinout, ADC124S021 application, or ADC124S021 equivalent, this page delivers verified electrical specs, industrial-temperature operation (−40°C to +85°C), VSSOP-10 package details, and real-world timing behavior for embedded sensor interfacing and remote monitoring systems.

Technical Context

The ADC124S021 employs a charge-redistribution DAC architecture with internal track-and-hold, acquiring input voltage over three SCLK cycles before executing 13-cycle conversion and readout. Its control logic accepts 8-bit DIN commands to select one of four analog inputs for the next conversion cycle.

Serial communication uses MSB-first, SPI/QSPI/MICROWIRE-compatible framing: CS falling edge initiates a 16-SCLK frame, DOUT outputs 12-bit result starting on the 5th SCLK falling edge, and power-down is asserted when CS is high-reducing consumption to 0.14 µW at 3V.

Key Specifications

Pinout & Package

ADC124S021 is housed in a 10-lead VSSOP (DGK) package-1.8 mm × 3.0 mm footprint, 0.5 mm pitch-with exposed pad for thermal enhancement and industrial-grade reliability.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit SAR ADC applications.

Compared with ADC124S051 and ADC104S021, the ADC124S021 uniquely balances 12-bit precision, 50–200 ksps adaptability, and sub-µW shutdown-making it the only option fully optimized for battery-constrained, multi-channel, industrial-grade data acquisition.

Availability

ADC124S021 is available at Aetrix Electronics and suitable for portable systems, remote data acquisition, and instrumentation and control systems requiring stable component supply, long-term lifecycle support, and guaranteed industrial-temperature performance.

Supply support for ADC124S021 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and high-reliability silicon solutions for industrial, automotive, and communications markets.

The ADC124S021 belongs to TI's precision SAR ADC product line-designed specifically for low-power, multi-channel data acquisition in space- and energy-constrained embedded systems.

FAQ

What is the maximum clock frequency supported by ADC124S021?

The ADC124S021 supports a maximum SCLK frequency of 3.2 MHz, with minimum of 0.8 MHz. This range ensures reliable operation across its full 50–200 ksps sample rate specification. At 3.2 MHz, the device achieves 200 ksps throughput with 16-SCLK frames per conversion. Exceeding 3.2 MHz may violate timing margins and degrade DNL or SNR performance in the ADC124S021.

Does ADC124S021 require an external reference voltage?

No, the ADC124S021 uses its VA supply pin as the reference-output codes scale linearly from 0 to VA. This eliminates need for external reference components but requires clean, well-bypassed VA (1 µF + 0.1 µF near pin) to maintain 72 dB SNR. Using a precision low-noise LDO or dedicated reference as VA improves ADC124S021 performance in noise-sensitive applications.

How does channel selection work on ADC124S021?

Channel selection is controlled via the 3-bit ADD2:ADD0 field in the 8-bit DIN control register. Writing '000' selects IN1 (default), '001' selects IN2, '010' selects IN3, and '011' selects IN4. The selected channel is sampled during the *next* conversion cycle-not the current one-so DIN data must be clocked in before each CS assertion to configure subsequent acquisition in the ADC124S021.

What is the power-down current of ADC124S021 at 3V supply?

When CS is held high, the ADC124S021 enters shutdown mode drawing only 38 nA typical (0.14 µW at 3V). This ultra-low quiescent current enables energy harvesting or coin-cell applications where periodic wake-up sampling is used. Full functionality resumes within one SCLK cycle after CS goes low-no power-up delay or dummy conversions are needed in the ADC124S021.

Is ADC124S021 compatible with standard SPI interfaces?

Yes, the ADC124S021 implements a native SPI-compatible serial interface: CS acts as slave select, SCLK provides clock, DOUT is MOSI-equivalent (data out), and DIN is MISO-equivalent (data in). It supports CPOL = 0, CPHA = 0 timing and outputs MSB-first 12-bit words. No configuration registers or initialization sequences are required-making ADC124S021 plug-and-play with most microcontroller SPI peripherals.