Texas Instruments ADC102S021CIMM/NOPB

Overview

ADC102S021CIMM/NOPB from Texas Instruments is a low-power, 2-channel, 10-bit successive-approximation ADC with SPI-compatible serial interface, operating at 50–200 ksps sample rates and supporting single-supply operation from 2.7V to 5.25V. It features ±0.13 LSB typical INL/DNL, 61.8 dB SNR, and integrated track-and-hold for portable instrumentation and remote data acquisition.

For engineers reviewing the ADC102S021CIMM/NOPB datasheet, ADC102S021CIMM/NOPB pinout, ADC102S021CIMM/NOPB application, or ADC102S021CIMM/NOPB equivalent, this device delivers verified dual-channel sampling, straight-binary output, power-down mode (0.12 µW @ 3V), industrial temperature range (−40°C to +85°C), and VSSOP-8 packaging - all critical for embedded sensor interface design.

Technical Context

The ADC102S021CIMM/NOPB implements a charge-redistribution DAC architecture with internal multiplexer and track-and-hold circuitry, enabling simultaneous channel selection and conversion sequencing via an 8-bit control register written on DIN during each frame. Its conversion timing is strictly synchronized to SCLK, requiring integer multiples of 16 clock cycles per serial frame.

It operates in two distinct phases per conversion: 3 SCLK cycles in track mode (acquiring input voltage onto sampling capacitor), followed by 13 SCLK cycles in hold/convert mode (successive approximation and MSB-first serial readout). The device supports SPI, QSPI, and MICROWIRE protocols without external level-shifting due to rail-to-rail digital I/O compatibility.

Key Specifications

Pinout & Package

ADC102S021CIMM/NOPB is housed in an 8-lead VSSOP package (DGK0008A), with 0.65 mm lead pitch and exposed thermal pad. Pin layout supports compact PCB routing and standard reflow profiles for lead-free assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADC102S021CIMM/NOPB, ADC102S051CIMM/NOPB trades lower minimum sample rate for higher speed headroom, while ADC122S021CIMM/NOPB provides quantifiable resolution gain at the expense of power efficiency - both retain identical interface logic and PCB footprint.

Availability

ADC102S021CIMM/NOPB is available at Aetrix Electronics and suitable for portable medical devices, industrial process controllers, smart building environmental sensors, and test equipment requiring stable component supply with long-term manufacturability.

Supply support for ADC102S021CIMM/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 delivering analog, embedded processing, and connectivity solutions with deep expertise in precision data converters and low-power design.

The ADC102S021CIMM/NOPB belongs to TI's precision SAR ADC product line, engineered specifically for cost-sensitive, space-constrained applications requiring dual-channel sampling, flexible supply operation, and robust serial interfacing without external support components.

FAQ

What is the absolute maximum analog input voltage for ADC102S021CIMM/NOPB?

The absolute maximum analog input voltage for ADC102S021CIMM/NOPB is VA + 0.3 V, and the minimum is −0.3 V relative to GND. Exceeding these limits risks forward-biasing internal ESD diodes, potentially causing latch-up or measurement errors. The recommended operating range remains 0 V to VA, as specified in the Electrical Characteristics table.

Does ADC102S021CIMM/NOPB require external reference voltage?

No, ADC102S021CIMM/NOPB does not require an external reference voltage. It uses its VA supply pin as both power source and reference, resulting in ratiometric conversion where output codes scale linearly with VA. This eliminates need for precision voltage references but requires stable, low-noise VA supply decoupling (1 µF + 0.1 µF capacitors within 1 cm).

How many SCLK cycles are needed to complete one conversion and read out data for ADC102S021CIMM/NOPB?

ADC102S021CIMM/NOPB requires exactly 16 SCLK cycles per conversion frame: 3 cycles for track mode acquisition, followed by 13 cycles for hold/convert and MSB-first serial readout starting at the 5th SCLK falling edge. Each frame must contain an integer multiple of 16 SCLK cycles to maintain synchronization and avoid data corruption.

Can ADC102S021CIMM/NOPB perform simultaneous sampling on both channels?

No, ADC102S021CIMM/NOPB cannot perform true simultaneous sampling. It uses a single successive-approximation core with an internal multiplexer, so IN1 and IN2 are sampled sequentially within separate frames. Channel selection is controlled by the 3-bit ADD[2:0] field in the 8-bit control register loaded via DIN, enabling deterministic alternation but not concurrent acquisition.

What is the purpose of the DONTC bits in the ADC102S021CIMM/NOPB control register?

The DONTC bits (bits 7–6 and 2–0) in the ADC102S021CIMM/NOPB control register are "don't care" positions - their values have no functional effect on operation. Only bits ADD2 (bit 5), ADD1 (bit 4), and ADD0 (bit 3) determine channel selection (IN1 or IN2), as defined in Table 5 of the datasheet. Writing any value to DONTC bits is permissible and ignored by the device logic.