Texas Instruments ADC084S021CIMM

Overview

ADC084S021 from Texas Instruments is a 4-channel, 8-bit successive-approximation analog-to-digital converter (SAR ADC) with serial SPI-compatible interface, 50–200 ksps sample rate range, ±0.04 LSB typical INL/DNL, and single-supply operation from 2.7 V to 5.25 V. It integrates an internal track-and-hold circuit and supports up to four independent analog inputs (IN1–IN4) for multiplexed data acquisition in portable instrumentation.

For engineers reviewing the ADC084S021 datasheet, ADC084S021 pinout, ADC084S021 application, or ADC084S021 equivalent, this page delivers verified technical context, real-world timing behavior, power management trade-offs across supply voltages, industrial temperature support (–40°C to +85°C), and validated alternative options for multi-channel 8-bit SAR ADC selection.

Technical Context

The ADC084S021 implements a charge-redistribution SAR architecture with a dedicated internal track-and-hold stage, enabling full conversion within 16 SCLK cycles (3 cycles track + 13 cycles convert/readout). Its control logic accepts channel-select commands via DIN on rising SCLK edges, with output data clocked MSB-first on DOUT at falling SCLK edges - fully compatible with SPI, QSPI, and MICROWIRE protocols.

Operation is frame-synchronized by CS: each frame begins on CS falling edge and must contain integer multiples of 16 SCLK cycles. Power-down mode activates automatically when CS is high, reducing supply current to ≤200 nA and power consumption to ≤1.05 µW at 5.25 V - critical for battery-powered remote sensing nodes requiring low-duty-cycle sampling.

Key Specifications

Pinout & Package

ADC084S021 is housed in a 10-pin VSSOP package (3.00 mm × 3.00 mm body size), optimized for space-constrained PCB layouts while maintaining thermal performance (R_θJA = 190°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 4-channel, 8-bit SAR ADC applications.

Compared with ADC084S021, ADC084S051 offers direct upgrade path for speed-critical systems while preserving footprint and firmware compatibility, whereas ADS7822 trades channel count and package size for reduced pin count and simplified serial framing - making it viable only when external multiplexing is acceptable.

Availability

ADC084S021 is available at Aetrix Electronics and suitable for portable instrumentation, remote telemetry, and industrial sensor interface applications requiring stable component supply, long-term lifecycle assurance, and guaranteed traceable sourcing.

Supply support for ADC084S021 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 ADC084S021 belongs to TI's low-power SAR ADC product line, engineered specifically for space- and energy-constrained data acquisition systems where multi-channel capability, wide supply range, and guaranteed AC/DC performance across temperature are essential.

FAQ

What is the minimum and maximum sample rate supported by the ADC084S021?

The ADC084S021 operates across a guaranteed sample rate range of 50 ksps to 200 ksps. Unlike many SAR ADCs specified only at a single rate, its electrical characteristics-including INL, DNL, SNR, and THD-are fully characterized and ensured across this entire range, enabling robust design without derating. This flexibility supports both low-duty-cycle sensor polling and continuous waveform capture in the same hardware platform.

Does the ADC084S021 require external reference voltage or calibration?

No, the ADC084S021 uses an internal reference derived from the VA supply and requires no external reference or factory calibration. Its offset error is ±0.7 LSB and full-scale error is ±0.7 LSB, both specified over temperature and supply voltage. The device achieves ±0.04 LSB typical INL/DNL without trimming, making it suitable for applications where calibration overhead must be minimized, such as disposable medical sensors or cost-sensitive industrial controls.

How does the ADC084S021 handle channel selection during continuous conversion?

The ADC084S021 loads channel selection via the DIN pin during each conversion frame: the ADD2–ADD0 bits written at the start of a frame determine which input (IN1–IN4) will be sampled in the *next* conversion cycle. This pipelined addressing allows seamless sequential or arbitrary channel sequencing without gaps or delays. For example, writing "001" selects IN2 for the subsequent sample, while the current conversion proceeds on the previously selected channel.

What is the power consumption of ADC084S021 at 3.6 V supply and 100 ksps sample rate?

At 3.6 V supply and 100 ksps sample rate, the ADC084S021 draws 0.45–0.8 mA supply current in normal operation, corresponding to 1.6–2.9 mW power consumption. In shutdown mode (CS high), current drops to 200 nA - just 0.72 µW. These values are measured under load with CL = 50 pF and reflect real-world efficiency for microcontroller-driven burst-mode acquisition in battery-powered devices.

Is the ADC084S021 compatible with 1.8-V logic interfaces?

No, the ADC084S021 digital I/O (CS, SCLK, DIN, DOUT) is not 1.8-V tolerant. Its VIH minimum is 2.1 V at 3.6 V VA and 2.4 V at 5.25 V VA; VIL maximum is 0.8 V. Direct connection to 1.8-V microcontrollers requires level-shifting circuitry on all digital lines. However, its 2.7–5.25 V VA range allows coexistence with 3.3-V or 5-V logic families without translation - simplifying interface design in most industrial and instrumentation systems.