Texas Instruments ADC082S021CIMM

Overview

ADC082S021 from Texas Instruments is an 8-bit, dual-channel successive-approximation analog-to-digital converter with serial SPI-compatible interface, 50–200 ksps sample rate range, ±0.04 LSB typical INL/DNL, and 49.6 dB typical SNR - used for precision voltage monitoring in portable instrumentation and remote sensor nodes.

For engineers reviewing the ADC082S021 datasheet, ADC082S021 pinout, ADC082S021 application, or ADC082S021 equivalent, key selection considerations include its VSSOP-8 package, single 2.7V–5.25V supply operation, channel-selectable input multiplexing via DIN control register, and ultra-low 0.12 µW shutdown power at 3V.

Technical Context

The ADC082S021 implements a charge-redistribution DAC architecture with internal track-and-hold, supporting two analog inputs (IN1/IN2) selected dynamically via an 8-bit control register written on DIN during each conversion frame. Conversion timing is fully synchronous to SCLK, requiring 16 clock cycles per frame (3 for track, 13 for hold/convert/readout).

It uses straight binary output coding, supports SPI/QSPI/MICROWIRE protocols, and achieves stable performance across −40°C to +85°C with no power-up delay or dummy conversions. The VA supply serves as both reference and analog rail, making decoupling critical for SNR integrity.

Key Specifications

Pinout & Package

ADC082S021 is housed in an 8-lead VSSOP (Package DGK0008A), 3.0 mm × 3.0 mm body, 0.65 mm lead pitch, thermally enhanced for industrial ambient operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADC102S021 and ADC082S051, the ADC082S021 delivers optimal cost-performance balance for 8-bit, 200-ksps-class systems where strict power budgeting and proven industrial reliability are primary constraints.

Availability

ADC082S021 is available at Aetrix Electronics and suitable for portable instrumentation, remote data acquisition, and industrial process monitoring requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for ADC082S021 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, longevity, and industrial-grade qualification.

The ADC082S021 belongs to TI's precision SAR ADC family designed for low-power, multi-channel data acquisition in space-constrained, battery-sensitive, and thermally demanding environments.

FAQ

What is the minimum and maximum sample rate supported by the ADC082S021?

The ADC082S021 is fully specified from 50 ksps to 200 ksps - not just rated at a single point. This means all key parameters including INL, DNL, SNR, and THD are guaranteed across this entire range without derating. At 50 ksps, power drops proportionally, while at 200 ksps, throughput remains deterministic at 16 SCLK cycles per conversion frame. The ADC082S021 does not operate reliably outside this range.

How does the ADC082S021 select between IN1 and IN2 inputs?

The ADC082S021 selects its analog input channel via a 3-bit address field (ADD2–ADD0) in the 8-bit control register loaded on DIN during each conversion frame. Only codes '000' (IN1, default on power-up) and '001' (IN2) are valid; '01x' causes indeterminate DOUT behavior. The selection takes effect on the *next* conversion cycle, enabling predictable interleaved sampling without glitching.

Does the ADC082S021 require an external reference voltage?

No. The ADC082S021 uses its VA supply pin (2.7V–5.25V) as both power source and reference voltage - eliminating need for external reference ICs or dividers. Its transfer function is straight binary with LSB = VA/256, so accuracy depends directly on VA stability and noise. Local 1 µF + 0.1 µF bypassing within 1 cm of VA is mandatory to maintain 49.6 dB SNR.

What happens to DOUT when CS is high?

When CS is high, the ADC082S021 enters shutdown mode (0.12 µW at 3V), and DOUT is placed in high-impedance (tri-state) condition. This allows multiple ADC082S021 devices to share a common DOUT bus without external isolation. The tri-state leakage is ±0.01 µA max, and DOUT returns to active drive within 30 ns after CS falls, as specified in tEN timing parameter.

Is there a power-up delay or dummy conversion required before valid data appears on DOUT?

No. The ADC082S021 produces valid conversion results immediately after power stabilization - no power-up delay, reset sequence, or dummy conversions are needed. The first result after power-on corresponds to IN1. This zero-latency startup simplifies firmware initialization and enables rapid wake-from-sleep acquisition in energy-harvesting systems using the ADC082S021.