Texas Instruments ADC128S102CIMTX

Overview

ADC128S102 from Texas Instruments is a low-power, 8-channel, 12-bit successive-approximation register (SAR) ADC with 500 ksps to 1 MSPS throughput, independent analog (VA = 2.7–5.25 V) and digital (VD = 2.7–VA) supplies, and SPI/QSPI/MICROWIRE-compatible serial interface. It operates across −40°C to +105°C and is used in automotive navigation sensor signal digitization.

For engineers reviewing the ADC128S102 datasheet, ADC128S102 pinout, ADC128S102 application, or ADC128S102 equivalent, this page delivers verified electrical specs, TSSOP-16 pin mapping, real-world use cases in portable medical instruments, and validated alternative parts for industrial embedded systems requiring stable 12-bit sampling at ≤1 MSPS.

Technical Context

The ADC128S102 implements a charge-redistribution DAC-based SAR architecture with integrated track-and-hold. Its 16-cycle conversion sequence includes 3 SCLK cycles in track mode and 13 in hold/convert mode, enabling deterministic timing aligned to external SCLK (8–16 MHz).

It supports channel selection via 3-bit address (ADD2–ADD0) loaded on DIN during each frame, with straight-binary 12-bit output clocked MSB-first on DOUT. Power management is controlled solely by CS: low enables full operation (2.3 mW @ 3 V), high forces shutdown (0.06 µW @ 3 V).

Key Specifications

Pinout & Package

ADC128S102 is housed in a 16-lead TSSOP package (5.00 mm × 4.40 mm body size) with exposed pad not electrically connected. Pin functions are validated per TI SNAS298G Rev G (Jan 2015).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-channel, 12-bit SAR ADC applications.

Compared with ADS7953SRHBT and MAX11131ETE+, the ADC128S102 uniquely combines extended temperature rating (−40°C to +105°C), independent VA/VD supplies, and industry-leading 2.3 mW active power-making it optimal for thermally demanding, mixed-rail embedded systems where layout space and thermal dissipation are constrained.

Availability

ADC128S102 is available at Aetrix Electronics and suitable for automotive navigation, portable medical instruments, and industrial process monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADC128S102 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 industrial-grade ICs.

The ADC128S102 belongs to TI's precision SAR ADC product line, designed specifically for high-reliability, low-power, multi-channel sensor digitization in automotive, medical, and industrial control systems.

FAQ

What is the maximum clock frequency supported by ADC128S102?

The ADC128S102 supports an SCLK frequency range of 8 MHz to 16 MHz, as specified in the absolute maximum and recommended operating conditions. Operation outside this range may cause timing violations or conversion errors. The device achieves its full 1 MSPS sample rate at 16 MHz SCLK, with deterministic 16-cycle conversion timing confirmed across the entire range.

Does ADC128S102 require an external reference voltage?

No, ADC128S102 does not require an external reference. Its VA supply pin serves as both the analog power rail and the internal reference voltage (VREF = VA), with full-scale input range defined as 0 V to VA. This eliminates external reference components and associated layout complexity while maintaining 12-bit accuracy.

How is channel selection implemented on ADC128S102?

Channel selection is performed via a 3-bit address (ADD2–ADD0) loaded into the internal control register through the DIN pin during the first 8 rising edges of SCLK after CS falls. Valid combinations (000 to 111) map directly to IN0 through IN7, with IN0 as default on power-up. No configuration registers or I²C writes are needed.

What is the power consumption of ADC128S102 in shutdown mode?

In shutdown mode (CS = high), ADC128S102 draws just 0.06 µW typical at 3 V and 0.25 µW typical at 5 V. This ultra-low quiescent power enables rapid wake-up for event-driven sampling in battery-operated systems, with full-resolution conversion achieved on the first cycle after CS assertion.

Is ADC128S102 compatible with standard SPI controllers?

Yes, ADC128S102 is fully compatible with standard SPI, QSPI, and MICROWIRE interfaces. It uses a 4-wire SPI protocol (CS, SCLK, DIN, DOUT) with MSB-first, straight-binary output and no dummy cycles. Its timing aligns with common MCU SPI peripherals-no bit-banging or custom timing logic is required for integration.