Texas Instruments ADC081S021CIMF/NOPB

Overview

ADC081S021CIMF/NOPB from Texas Instruments is a single-channel, 8-bit successive-approximation analog-to-digital converter (SAR ADC) with SPI-compatible serial interface, operating from 2.7 V to 5.25 V supply and delivering 50–200 ksps sample rates. It features internal track-and-hold, straight-binary output, ±0.03 LSB typical INL/DNL, and 49.6 dB typical SNR at 100 kHz input - deployed in portable instrumentation for low-power sensor digitization.

For engineers reviewing the ADC081S021CIMF/NOPB datasheet, ADC081S021CIMF/NOPB pinout, ADC081S021CIMF/NOPB application, or ADC081S021CIMF/NOPB equivalent, key selection criteria include its guaranteed 50–200 ksps throughput range across voltage and temperature, ultra-low 2.6 µW shutdown power, SOT-23-6/WSON-6 package compatibility, and SPI/QSPI/MICROWIRE interface timing compliance.

Technical Context

The ADC081S021CIMF/NOPB implements a charge-redistribution SAR architecture with integrated track-and-hold, enabling precise sampling over its full 0–V_A analog input range. Its conversion cycle is fully synchronous to the external SCLK, requiring exactly 16 clock cycles per 8-bit result - with three leading zeros and four trailing zeros framing the data stream.

Functional mode control is managed solely via the CS pin: a falling edge initiates conversion and exits shutdown; holding CS high between the 2nd and 10th SCLK falling edges forces entry into shutdown mode, reducing supply current to 500 nA. Power-up time from shutdown is 1 µs, and acquisition time after hold-mode release is 350 ns.

Key Specifications

Pinout & Package

ADC081S021CIMF/NOPB is available in two 6-pin packages: SOT-23 (2.50 mm × 2.20 mm) and WSON (1.60 mm × 2.90 mm), both rated for −40°C to +85°C operation. Pin functions are identical across packages.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7822IDR and MAX11100ETT+, the ADC081S021CIMF/NOPB uniquely guarantees full 50–200 ksps performance across voltage and temperature, offers dual-package flexibility (SOT-23/WSON), and delivers lowest shutdown power among 5 V–capable 8-bit SAR ADCs - making it optimal for cost-sensitive, battery-aware industrial sensing.

Availability

ADC081S021CIMF/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, remote data acquisition, and industrial control systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for ADC081S021CIMF/NOPB 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 designing analog ICs, embedded processors, and system solutions for industrial, automotive, and personal electronics markets.

The ADC081S021CIMF/NOPB belongs to TI's precision SAR ADC portfolio targeting low-power, cost-optimized data acquisition - engineered specifically for battery-operated sensors, portable test gear, and distributed control nodes where small size, low quiescent power, and guaranteed mid-speed performance are essential.

FAQ

What is the minimum quiet time (tQUIET) required between consecutive conversions for the ADC081S021CIMF/NOPB?

The ADC081S021CIMF/NOPB requires a minimum quiet time of 50 ns between the rising edge of CS ending one conversion and the next falling edge initiating another. This parameter ensures proper bus relinquish and internal state reset. The value is specified in the AC Electrical Characteristics table under "tQUIET" and applies across the full operating temperature and supply voltage range. Violating tQUIET may cause invalid data or metastability on SDATA.

Does the ADC081S021CIMF/NOPB support true differential input or only single-ended VIN?

The ADC081S021CIMF/NOPB supports only single-ended analog input on the VIN pin, referenced to GND, with an input range of 0 V to VA. It does not implement a differential input stage or internal reference - the full-scale voltage is set by the VA supply. For differential measurements, external signal conditioning (e.g., instrumentation amplifier) is required before connecting to VIN.

Can the ADC081S021CIMF/NOPB operate reliably at 5.25 V supply while maintaining its 49.6 dB SNR specification?

Yes, the ADC081S021CIMF/NOPB maintains its 49.6 dB typical SNR at 100 kHz input across the entire 2.7 V to 5.25 V supply range, as confirmed in Section 7.5 Electrical Characteristics. At 5.25 V, power consumption rises to 7.7 mW in normal mode, but dynamic performance including SNR, THD, and SFDR remains within datasheet limits - verified over −40°C to +85°C.

How many SCLK cycles are required to read a complete conversion result from the ADC081S021CIMF/NOPB?

The ADC081S021CIMF/NOPB requires exactly 16 SCLK falling edges to output a full conversion result: three leading zero bits, followed by eight data bits (MSB first), followed by four trailing zero bits. This fixed 16-cycle frame is defined in the Serial Timing Diagram and Feature Description sections. Attempting to read fewer cycles yields incomplete or misaligned data.

Is the ADC081S021CIMF/NOPB pin-compatible with other members of the ADC081S021 family such as ADC081S021081S051?

No, ADC081S021CIMF/NOPB is not pin-compatible with ADC081S021081S051 or other variants in the family. While all share the same 6-pin SOT-23/WSON footprint and pinout, ADC081S021081S051 is a distinct orderable part with different sample rate specification (200–500 ksps) and separate characterization - TI's Device Comparison Table confirms they are functionally aligned but not drop-in replacements. Always verify ordering part number against design requirements.