Texas Instruments ADC104S021CIMMX

Overview

ADC104S021 from Texas Instruments is a 10-bit, 4-channel successive-approximation analog-to-digital converter with serial SPI-compatible interface, operating from 2.7V to 5.25V supply and specified across 50 ksps to 200 ksps sample rates. It features ±0.13 LSB typical INL/DNL, 61.8 dB SNR at 39.9 kHz, and 0.12 µW shutdown power at 3V - used in portable instrumentation for multi-sensor voltage digitization.

For engineers reviewing the ADC104S021 datasheet, ADC104S021 pinout, ADC104S021 application, or ADC104S021 equivalent, this page delivers verified technical context, validated pin functions, real-world use scenarios, and two confirmed alternative parts for multi-channel, low-power 10-bit SAR ADC selection in industrial and automotive systems.

Technical Context

The ADC104S021 implements a charge-redistribution DAC architecture with internal track-and-hold, supporting four single-ended analog inputs (IN1–IN4) multiplexed into one conversion path. Its serial interface uses CS-controlled frames with 16 SCLK cycles per conversion, MSB-first DOUT timing synchronized to falling SCLK edges, and DIN-loaded channel address bits for next-cycle selection.

It operates over −40°C to +85°C with guaranteed performance across the full 50–200 ksps range - unlike fixed-rate SAR ADCs - and achieves 9.9-bit ENOB with 82 dB SFDR at 39.9 kHz input. Power scales linearly with supply and sample rate: 1.94 mW at 3V/200 ksps, dropping to 0.12 µW in shutdown mode.

Key Specifications

Pinout & Package

ADC104S021 is housed in a 10-lead VSSOP package (DGK), measuring 3.0 mm × 3.0 mm × 0.9 mm, with exposed thermal pad for improved heat dissipation in compact PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 4-channel, 10-bit SAR ADC applications.

Compared with ADC104S021, ADC104S051 extends maximum throughput while preserving power and accuracy, whereas ADC124S021 trades 2-bit resolution gain for modest power increase - both maintain identical pinout and serial protocol for drop-in evaluation and migration.

Availability

ADC104S021 is available at Aetrix Electronics and suitable for portable instrumentation, remote telemetry, and automotive cabin sensor systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for ADC104S021 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 ADC104S021 belongs to TI's precision SAR ADC family, engineered for low-power, multi-channel data acquisition in space-constrained, battery-operated, and harsh-environment applications including automotive and industrial control.

FAQ

What is the maximum sample rate supported by the ADC104S021?

The ADC104S021 is fully specified for continuous operation from 50 ksps up to 200 ksps. At 200 ksps, it achieves 1.94 mW power consumption with 3V supply and maintains ±0.13 LSB typical INL/DNL. Operation above 200 ksps is not characterized or guaranteed per the datasheet.

Does the ADC104S021 require an external reference voltage?

No, the ADC104S021 uses its VA supply pin as the internal reference - full-scale range is 0V to VA. This eliminates need for external reference components, simplifying design and reducing BOM count. Accuracy remains within ±0.13 LSB INL across VA = 2.7V to 5.25V.

How does the ADC104S021 handle channel selection during continuous conversion?

The ADC104S021 loads the next channel address via DIN during each conversion frame. The 8-bit control register uses bits ADD2–ADD0 to select IN1–IN4; default is IN1 on power-up. Channel sequencing is software-controlled and fully programmable without hardware reconfiguration.

Is the ADC104S021 compatible with standard SPI interfaces?

Yes, the ADC104S021 supports SPI, QSPI, and MICROWIRE protocols. It uses CS as frame sync, SCLK for timing, DOUT for MSB-first 10-bit data output on falling edges, and DIN for control register input on rising edges - matching standard Mode 0 (CPOL=0, CPHA=0) timing.

What is the power-down behavior of the ADC104S021 when CS is high?

When CS is high, the ADC104S021 enters shutdown mode, drawing only 32 nA at 3.6V. DOUT goes to high-impedance, internal clock is gated off, and analog circuitry is disabled. Recovery to first valid conversion takes no dummy cycles - the next CS fall initiates immediate sampling of IN1.