Texas Instruments ADC084S021CIMMX

Overview

ADC084S021 from Texas Instruments is a 4-channel, 8-bit successive-approximation analog-to-digital converter (SAR ADC) with serial SPI-compatible interface, operating from 2.7 V to 5.25 V supply, delivering 50–200 ksps sample rates, ±0.04 LSB typical INL/DNL, and 49.6 dB typical SNR - used in portable instrumentation for multi-sensor voltage digitization.

For engineers reviewing the ADC084S021 datasheet, ADC084S021 pinout, ADC084S021 application, or ADC084S021 equivalent, this page delivers verified electrical specs, industrial-temperature VSSOP package details, functional mode timing, channel selection logic, and real-world design implications of its track-and-hold acquisition and power-down behavior.

Technical Context

The ADC084S021 implements a charge-redistribution SAR architecture with integrated track-and-hold, supporting four single-ended analog inputs (IN1–IN4) selected via a 3-bit control register written on DIN. Conversion is initiated by CS falling edge, with full 16-cycle serial frame timing (3 cycles track + 13 cycles hold/convert/output).

It uses straight-binary output coding, supports SPI/QSPI/MICROWIRE protocols, and features variable power management: normal mode draws 1.6 mW at 3 V, dropping to 0.12 µW in shutdown (CS high). Input range is 0 V to VA, with 33 pF input capacitance in track mode and 3 pF in hold mode.

Key Specifications

Pinout & Package

The ADC084S021 is housed in a 10-pin VSSOP package (3.00 mm × 3.00 mm), rated for –40°C to +85°C operation.

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 higher speed at identical resolution and package, while ADC104S021 trades 2 extra bits of resolution for increased power and cost - both require no PCB changes but differ in signal fidelity and sampling bandwidth priorities.

Availability

ADC084S021 is available at Aetrix Electronics and suitable for portable instrumentation, remote data acquisition, and industrial sensor node designs requiring stable component supply, long-term lifecycle support, and guaranteed industrial-temperature operation.

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 and embedded processing technologies, with decades of expertise in precision data converters and low-power signal chain solutions.

The ADC084S021 belongs to TI's precision SAR ADC product line, designed specifically for cost-sensitive, space-constrained, and battery-operated systems needing multi-channel digitization without sacrificing accuracy or thermal stability.

FAQ

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

The ADC084S021 is fully specified across a sample rate range of 50 ksps to 200 ksps. Unlike many SAR ADCs rated only at a single speed, its electrical characteristics-including INL, DNL, SNR, and THD-are guaranteed across this entire range, enabling consistent performance in variable-rate applications such as adaptive sampling or burst-mode acquisition. This specification is confirmed in Section 7.6 of the official datasheet.

How does the ADC084S021 select which analog input channel to convert?

The ADC084S021 selects its input channel (IN1–IN4) via a 3-bit address (ADD2–ADD0) loaded into its internal control register through the DIN pin during each serial frame. The address written at the start of a frame determines the channel sampled in the *next* conversion cycle - meaning the first conversion after power-up defaults to IN1, and subsequent selections follow the prior frame's DIN data. This behavior is documented in Section 8.3 and Table 3 of the datasheet.

Does the ADC084S021 require an external reference voltage?

No, the ADC084S021 uses an internal reference derived from the VA supply rail and does not require an external reference. Its full-scale range is 0 V to VA, and all specifications - including INL, DNL, and SNR - are referenced to this supply-based scale. This simplifies design by eliminating external reference components and associated layout sensitivity, as confirmed in Sections 3, 7.3, and 7.5 of the datasheet.

What is the power consumption of the ADC084S021 in shutdown mode?

In shutdown mode (CS high), the ADC084S021 draws just 0.12 µW at 3 V or 1.05 µW at 5.25 V, as specified in Section 7.5 of the datasheet. This ultra-low quiescent current enables aggressive power cycling strategies in energy-harvesting or battery-powered systems, where the device can remain idle for extended periods and wake instantly upon CS assertion without initialization delay.

Is the ADC084S021 compatible with standard SPI interfaces?

Yes, the ADC084S021 supports SPI, QSPI, and MICROWIRE protocols. Its serial interface uses CS as frame sync, SCLK for timing, DIN for control register writes, and DOUT for MSB-first data reads - matching standard SPI Mode 0 (CPOL = 0, CPHA = 0) timing. No configuration registers or mode pins are needed; compatibility is inherent in its hardware design, as detailed in Sections 3, 6, and 8.3 of the datasheet.