Texas Instruments ADC124S051CIMMX

Overview

ADC124S051 from Texas Instruments is a 12-bit, 4-channel successive-approximation ADC with serial SPI-compatible interface, operating at 200–500 ksps sample rates, 2.7V–5.25V single supply, and −40°C to +85°C industrial temperature range. It integrates internal track-and-hold and charge-redistribution DAC for precision data acquisition in portable instrumentation.

For engineers reviewing the ADC124S051 datasheet, ADC124S051 pinout, ADC124S051 application, or ADC124S051 equivalent, key selection criteria include its guaranteed 12-bit no-missing-codes performance, channel-to-channel crosstalk of −86 dB, 72.5 dB typical SNR, low-power shutdown mode (0.14 µW @ 3V), and VSSOP-10 package compatibility with space-constrained embedded systems.

Technical Context

The ADC124S051 implements a charge-redistribution SAR architecture with integrated multiplexer and track-and-hold circuitry. It accepts four analog inputs (IN1–IN4) and performs conversion in 13 SCLK cycles after a 3-cycle acquisition window, delivering 12-bit straight-binary output MSB-first on DOUT.

Its serial interface supports SPI, QSPI, and MICROWIRE protocols via CS, SCLK, DIN, and DOUT pins. Control register programming via DIN enables dynamic input channel selection (ADD2–ADD0 bits), while power-down is activated by high CS, reducing current to 38 nA @ 3.6V.

Key Specifications

Pinout & Package

ADC124S051 is housed in a 10-lead VSSOP (Package Code DGS), 3.0 mm × 3.0 mm × 0.9 mm body, with exposed thermal pad (not electrically connected). Requires 1 µF tantalum + 0.1 µF ceramic bypassing at VA pin within 1 cm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADC124S051, ADC124S021 offers identical functionality at reduced speed and cost, while ADC122S101 trades channel count and pin compatibility for higher sample rate - making ADC124S051 the optimal balance of 4-channel flexibility, 500 ksps capability, and industrial-grade specifications.

Availability

ADC124S051 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 ADC124S051 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 connectivity technologies, with decades of expertise in precision data converters and industrial-grade IC design.

The ADC124S051 belongs to TI's precision SAR ADC product line, engineered for low-power, multi-channel data acquisition in space- and energy-constrained embedded systems across industrial, medical, and portable applications.

FAQ

What is the maximum sample rate supported by the ADC124S051?

The ADC124S051 is fully specified for operation from 200 ksps to 500 ksps. Its conversion time is fixed at 13 SCLK cycles, and throughput time is 16 SCLK cycles, meaning maximum sample rate depends on SCLK frequency (up to 8 MHz). At 500 ksps, the device maintains all key specifications including INL, SNR, and crosstalk - no derating required.

Does the ADC124S051 require an external reference voltage?

No, the ADC124S051 uses its VA supply pin as the reference voltage - it operates ratiometrically with input range 0 V to VA. This eliminates the need for an external reference, reduces BOM count, and simplifies layout. However, supply noise directly affects SNR, so proper bypassing (1 µF + 0.1 µF) is essential for achieving the specified 72.5 dB SNR.

How is channel selection implemented on the ADC124S051?

Channel selection is controlled via the 3-bit ADD2–ADD0 field in the 8-bit control register loaded through the DIN pin. The mapping is: 000 → IN1 (default), 001 → IN2, 010 → IN3, 011 → IN4. These bits are clocked in during the first 8 rising edges of SCLK after CS falls, determining the input for the *next* conversion cycle - enabling seamless sequential or random channel access.

What is the power consumption of ADC124S051 in shutdown mode?

In shutdown mode (CS high), the ADC124S051 draws just 38 nA typical at +3.6V supply, equivalent to 0.14 µW power dissipation. This ultra-low quiescent current makes it ideal for battery-powered applications requiring periodic wake-up and measurement. Recovery to full operation is immediate - no power-up delay or dummy conversions are needed.

Is the ADC124S051 pin-compatible with other devices in the ADC124S family?

Yes, the ADC124S051 is fully pin- and function-compatible with ADC124S021 (200 ksps max) and ADC122S101 (1 Msps, 2-channel), as confirmed in Table 1 of the datasheet. However, ADC122S101 has only 8 pins and lacks DIN-based channel selection - true pin compatibility applies only to the 10-pin variants (ADC124S021/ADC124S051), enabling direct replacement with no PCB changes.