Texas Instruments ADC082S021CIMMX

Overview

ADC082S021CIMMX from Texas Instruments is a low-power, 2-channel, 8-bit successive-approximation ADC with serial SPI-compatible interface, 50–200 ksps sample rate range, ±0.04 LSB typical INL/DNL, and operation from 2.7V to 5.25V supply. It performs simultaneous track-and-hold on two analog inputs (IN1/IN2) and delivers straight-binary output for portable instrumentation and remote data acquisition.

For engineers reviewing the ADC082S021CIMMX datasheet, ADC082S021CIMMX pinout, ADC082S021CIMMX application, or ADC082S021CIMMX equivalent, key selection factors include its dual-channel sampling without external MUX, guaranteed monotonicity over industrial temperature (−40°C to +85°C), ultra-low shutdown current (0.72 µW at 3.6V), and VSSOP-8 package compatibility with space-constrained embedded sensor nodes.

Technical Context

The ADC082S021CIMMX implements a charge-redistribution DAC architecture with internal track-and-hold, enabling precise conversion of either IN1 or IN2 per frame under software control via DIN-loaded 3-bit channel address (ADD2:ADD0). Its serial interface operates synchronously with SCLK (0.8–3.2 MHz), where CS falling edge initiates a 16-SCLK-frame containing acquisition (3 cycles), conversion (13 cycles), and MSB-first readout.

Power management is integrated: normal mode draws 0.45–1.7 mA depending on VA and sample rate, while high-impedance shutdown (CS high) reduces current to 200 nA. The device uses VA as both supply and reference, requiring tight decoupling (1 µF + 0.1 µF) to maintain 49.6 dB SNR and 68 dB SFDR performance.

Key Specifications

Pinout & Package

ADC082S021CIMMX is housed in an 8-lead VSSOP package (DGK0008A), 3.0 mm × 3.0 mm × 1.0 mm body, 0.65 mm lead pitch, exposed thermal pad not electrically connected. Designed for surface-mount reflow with JEDEC-standard profile.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel SAR ADC applications.

Compared with ADC082S021CIMMX, ADC102S021 provides 2 extra bits of resolution at cost of +50% power and reduced battery life, while ADC082S051 trades guaranteed 0.04 LSB linearity for higher speed-neither offers drop-in replacement without firmware or layout review.

Availability

ADC082S021CIMMX is available at Aetrix Electronics and suitable for portable medical sensors, industrial remote I/O modules, smart energy metering subsystems, and test & measurement handhelds requiring stable component supply across extended product lifecycles.

Supply support for ADC082S021CIMMX 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets since 1930.

The ADC082S021CIMMX belongs to TI's precision SAR ADC portfolio designed specifically for low-power, dual-channel data acquisition in space- and energy-constrained embedded systems.

FAQ

What is the absolute maximum analog input voltage for the ADC082S021CIMMX?

The absolute maximum analog input voltage for ADC082S021CIMMX is VA + 0.3 V, with VA ranging from 2.7 V to 5.25 V. However, the functional input range is strictly 0 V to VA per the Electrical Characteristics table. Exceeding VA risks violating the Absolute Maximum Rating and may cause irreversible damage or increased leakage current beyond ±1 µA.

Does the ADC082S021CIMMX require an external reference voltage?

No, ADC082S021CIMMX does not require an external reference voltage. It uses VA as both the analog supply and the reference, resulting in a full-scale range of 0 V to VA. This simplifies design but means supply noise directly impacts accuracy-TI recommends local 1 µF + 0.1 µF bypassing within 1 cm of the VA pin to maintain 49.6 dB SNR.

How is channel selection implemented on the ADC082S021CIMMX?

Channel selection on ADC082S021CIMMX is controlled by bits ADD2–ADD0 in an 8-bit control register loaded via DIN during each conversion frame. Only ADD1 and ADD0 are functional: '00' selects IN1 (default), '01' selects IN2, and '1x' is invalid. The register is clocked in on the first 8 rising SCLK edges after CS falls, defining the input for the *next* conversion cycle.

What is the minimum SCLK duty cycle required for reliable operation of ADC082S021CIMMX?

The minimum SCLK duty cycle for ADC082S021CIMMX is 30%, and the maximum is 70%, as specified in the AC Electrical Characteristics table. Operation outside this range-especially below 30%-may violate tCH (high pulse width) or tCL (low pulse width) timing margins, leading to incorrect sampling or corrupted DOUT data, particularly at 3.2 MHz maximum clock frequency.

Can the ADC082S021CIMMX operate without power-up delay or dummy conversions?

Yes, ADC082S021CIMMX requires no power-up delay or dummy conversions. It begins valid conversion immediately after power stabilization: the first result after power-on corresponds to IN1. This behavior is confirmed in the Applications Information section and eliminates startup sequencing complexity in battery-powered or fast-wake systems.