Texas Instruments ADC124S051CIMM

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 over −40°C to +85°C, consuming 3.0 mW at 3V and featuring 72.5 dB SNR and ±0.5 LSB INL - used for multi-sensor data acquisition in portable instrumentation.

For engineers reviewing the ADC124S051 datasheet, ADC124S051 pinout, ADC124S051 application, or ADC124S051 equivalent, key selection criteria include its 10-pin VSSOP package, single-supply 2.7–5.25 V operation, channel-selectable analog inputs (IN1–IN4), power-down mode (0.14 µW), and straight-binary output compatible with microcontrollers and DSPs.

Technical Context

The ADC124S051 implements a charge-redistribution DAC-based successive-approximation architecture with integrated track-and-hold. It accepts four analog inputs via an internal multiplexer and performs conversion in 13 SCLK cycles after a 3-cycle acquisition window.

Serial communication uses a 16-cycle frame (CS low), with MSB-first DOUT output and DIN-controlled channel selection via a 3-bit address (ADD2–ADD0). The device operates without power-up delay and delivers full-conversion results immediately after power-on, defaulting to IN1.

Key Specifications

Pinout & Package

ADC124S051 is housed in a 10-lead VSSOP package (package code DGS), optimized for compact PCB layouts and thermal performance (θ_JA = 190°C/W).

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 accuracy and pinout at lower speed, while ADC122S101 trades two input channels for higher throughput and non-compatible pin assignment - making ADC124S051 the sole option for 4-channel, 200–500 ksps, pin-identical designs.

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 manufacturability, and industrial temperature support.

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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, precision, and energy efficiency.

The ADC124S051 belongs to TI's precision SAR ADC product line, designed specifically for low-power, multi-channel data acquisition in space-constrained industrial and portable equipment.

FAQ

What is the maximum sample rate supported by the ADC124S051?

The ADC124S051 supports a maximum sample rate of 500 ksps, with full electrical specifications guaranteed across the entire 200–500 ksps range. At 500 ksps, it maintains 72.5 dB SNR, ±0.5 LSB INL, and 12-bit resolution with no missing codes - enabling high-fidelity acquisition in real-time monitoring systems using the ADC124S051.

Does the ADC124S051 require an external reference voltage?

No, the ADC124S051 uses its VA supply pin as the voltage reference, eliminating the need for an external reference. Its straight-binary output scales from 0 to VA, with LSB = VA/4096. This simplifies design but requires clean, well-bypassed VA (1 µF + 0.1 µF) to maintain ADC124S051 performance - noise on VA directly impacts SNR and INL.

How does channel selection work on the ADC124S051?

Channel selection is controlled via the 3-bit ADD2–ADD0 field written to the ADC124S051's control register through the DIN pin during each 16-cycle serial frame. Valid combinations are: 000 → IN1 (default), 001 → IN2, 010 → IN3, 011 → IN4. The selected channel is sampled in the *next* conversion cycle - enabling deterministic sequencing in firmware using the ADC124S051.

What is the power consumption of the ADC124S051 in shutdown mode?

In shutdown mode (CS high), the ADC124S051 draws just 0.14 µW at 3 V or 0.32 µW at 5 V. This ultra-low quiescent power enables energy harvesting and battery-operated applications to extend operational life significantly - for example, a 200 mAh coin cell could power the ADC124S051 in shutdown for over 20 years. The ADC124S051 resumes full operation within one SCLK cycle after CS goes low.

Is the ADC124S051 pin-compatible with other members of the ADC124S family?

Yes, the ADC124S051 is fully pin- and function-compatible with ADC124S021 (lower speed variant) as confirmed in Table 1 of the datasheet. Both share identical 10-pin VSSOP packaging, pin assignments, control register structure, and serial timing - allowing direct replacement in existing layouts when sample rate requirements change, provided the ADC124S051's 200–500 ksps range meets system needs.