Texas Instruments ADC101S021CISD/NOPB

Overview

ADC101S021CISD/NOPB from Texas Instruments is a single-channel, 10-bit successive-approximation ADC with SPI/QSPI/MICROWIRE/DSP-compatible serial interface, operating at 50–200 ksps sample rates over +2.7V to +5.25V supply, delivering 61.6 dB SNR and ±0.14 LSB INL (typ) for precision sensor signal digitization in portable instrumentation.

For engineers reviewing the ADC101S021CISD/NOPB datasheet, ADC101S021CISD/NOPB pinout, ADC101S021CISD/NOPB application, or ADC101S021CISD/NOPB equivalent, key selection considerations include guaranteed performance across full 50–200 ksps range, 2.34 mW power at 3.6V, WSON-6/SOT-23-6 package compatibility, and straight-binary output timing aligned to SCLK falling edges.

Technical Context

The ADC101S021CISD/NOPB implements a charge-redistribution DAC core with internal track-and-hold, enabling precise sampling of analog inputs from 0 V to VA without external reference. Its conversion sequence is initiated by CS falling edge, with acquisition time (tACQ ≤ 350 ns) defined relative to the 13th rising SCLK edge before CS.

Serial data output on SDATA follows a fixed 16-cycle frame: three leading zeros, ten MSB-first data bits, and two trailing zeros - compatible with standard SPI masters without mode configuration. Power management is controlled solely via CS: high state forces shutdown (2.6 µW at 5.25V), low state enables continuous or burst-mode operation.

Key Specifications

Pinout & Package

ADC101S021CISD/NOPB is packaged in a 6-lead WSON (3 mm × 3 mm, 0.65 mm pitch) with exposed thermal pad, optimized for space-constrained PCB layouts and thermal dissipation in industrial environments.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 10-bit SAR ADC applications.

Compared with ADC101S051CISD/NOPB and ADC121S021CISD/NOPB, the ADC101S021CISD/NOPB provides optimal balance of ultra-low power (2.34 mW), guaranteed 50–200 ksps linearity, and 10-bit precision - making it the preferred choice for cost- and energy-sensitive embedded sensing where 12-bit resolution is unnecessary.

Availability

ADC101S021CISD/NOPB is available at Aetrix Electronics and suitable for portable systems, remote data acquisition, and instrumentation and control systems requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for ADC101S021CISD/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 leader specializing in analog and embedded processing technologies, with decades of expertise in precision data converters and low-power design.

The ADC101S021CISD/NOPB belongs to TI's single-channel SAR ADC family engineered for space-constrained, battery-operated instrumentation - emphasizing guaranteed AC/DC specs across full sample-rate range and seamless integration with microcontroller SPI peripherals.

FAQ

What is the maximum guaranteed sample rate for ADC101S021CISD/NOPB?

The ADC101S021CISD/NOPB is fully specified up to 200 ksps - all key parameters including INL, DNL, SNR, and THD are guaranteed across the entire 50–200 ksps range per the SNAS307G datasheet. While the device can operate up to 1 Msps under certain conditions, only the 50–200 ksps band ensures compliance with published specifications for production designs.

Does ADC101S021CISD/NOPB require an external voltage reference?

No, ADC101S021CISD/NOPB uses its VA supply pin as the reference - eliminating the need for external references or precision regulators. The full-scale range is 0 V to VA, and SNR of 61.6 dB is achieved with proper 1 µF + 0.1 µF bypassing at VA, as confirmed in the Typical Performance Characteristics section of the datasheet.

How does power management work on ADC101S021CISD/NOPB?

Power state is controlled exclusively by the CS pin: pulling CS high places ADC101S021CISD/NOPB into shutdown mode (2.6 µW at 5.25V), while pulling CS low initiates conversion and normal operation (2.34 mW at 3.6V). No separate power-down command or register write is needed - simplifying firmware and reducing wake-up latency.

Is ADC101S021CISD/NOPB pin-compatible with other devices in TI's ADC1xxS021 family?

Yes - ADC101S021CISD/NOPB shares identical 6-pin WSON/SOT-23 pinout and function with ADC121S021CISD/NOPB and ADC081S021CISD/NOPB, as stated in Table 2 ("Pin-Compatible Alternatives") of the SNAS307G datasheet. This enables hardware reuse across 8-/10-/12-bit variants without PCB redesign.

What is the data format and timing behavior of ADC101S021CISD/NOPB's SDATA output?

ADC101S021CISD/NOPB outputs straight-binary data in a fixed 16-clock frame: three leading zeros, ten MSB-first data bits, and two trailing zeros - all clocked out on SCLK falling edges. The SDATA pin enters tri-state after the 16th falling edge or upon CS rising, enabling multi-drop SPI bus sharing without contention.