Texas Instruments ADC128S022CIMT

Overview

ADC128S022 from Texas Instruments is a 12-bit, 8-channel successive-approximation register (SAR) analog-to-digital converter with independent analog (VA) and digital (VD) supplies, 50–200 kSPS throughput, SPI/QSPI/MICROWIRE-compatible serial interface, and operation over −40°C to +105°C for industrial and automotive sensor data acquisition.

For engineers reviewing the ADC128S022 datasheet, ADC128S022 pinout, ADC128S022 application, or ADC128S022 equivalent, this page delivers verified electrical specs, TSSOP-16 pin mapping, real-world use cases in portable medical instruments and navigation systems, and two validated alternative parts with documented functional and supply-voltage differences.

Technical Context

The ADC128S022 implements a charge-redistribution DAC architecture with integrated track-and-hold, where the first 3 SCLK cycles perform analog input acquisition and the subsequent 13 cycles execute conversion and serial output (MSB-first, straight binary). It supports continuous and burst conversion modes controlled by CS level and SCLK framing.

Its dual-supply design allows VA (2.7–5.25 V) to serve as both analog rail and reference, while VD (2.7–VA) powers digital logic independently-enabling mixed-voltage system interfacing without level shifters. Input channels IN0–IN7 are multiplexed via a 3-bit address register loaded on DIN during each frame's initial SCLK rising edges.

Key Specifications

Pinout & Package

ADC128S022 is housed in a 16-pin TSSOP package (4.40 mm × 5.00 mm body size) with exposed pad not electrically connected. Pin functions are validated per TI SNAS334F Rev F datasheet.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7953SRHBT and MAX11131ETE+, ADC128S022 uniquely balances low shutdown power (0.25 µW), dual-supply flexibility, and guaranteed −40°C to +105°C operation-making it optimal for cost-sensitive, thermally demanding, battery-aware embedded systems where 200 kSPS suffices.

Availability

ADC128S022 is available at Aetrix Electronics and suitable for automotive navigation systems, portable medical instruments, industrial process control modules, and mobile communications baseband monitoring requiring stable component supply across extended temperature and mixed-voltage environments.

Supply support for ADC128S022 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 IC design.

ADC128S022 belongs to TI's precision SAR ADC product line, engineered for low-power, multi-channel sensor signal digitization in harsh environments-including automotive, medical, and industrial applications demanding reliability and supply flexibility.

FAQ

What is the maximum clock frequency supported by ADC128S022?

The ADC128S022 supports a maximum SCLK frequency of 3.2 MHz, as specified in the timing characteristics table of the SNAS334F datasheet. Operation above this limit may cause incorrect conversion results or timing violations. The minimum SCLK is 0.8 MHz, and the recommended duty cycle is 40%–60%. At 3.2 MHz, the device achieves its rated 200 kSPS throughput in continuous mode.

Does ADC128S022 require an external reference voltage?

No, ADC128S022 does not require an external reference. Its VA pin serves as both the analog supply and the internal reference voltage, establishing a full-scale input range of 0 V to VA. This eliminates the need for a separate precision reference IC or resistor divider network, simplifying BOM and layout for cost-sensitive designs.

How is channel selection implemented on ADC128S022?

Channel selection on ADC128S022 is performed via a 3-bit address (ADD2–ADD0) loaded into the control register through the DIN pin during the first 8 SCLK rising edges after CS falls. Valid combinations (000 to 111) select IN0 through IN7 respectively. The default channel after power-up is IN0, and no dummy conversion is needed to achieve full resolution.

What is the power consumption of ADC128S022 in shutdown mode?

In shutdown mode (CS high), ADC128S022 draws just 50 nA at 5 V and 20 nA at 3 V, corresponding to 0.25 µW and 0.06 µW power dissipation respectively. This ultra-low quiescent current enables energy harvesting and long-life battery operation in intermittent-sampling applications such as environmental sensors and wearable diagnostics.

Can ADC128S022 operate with VA = 3.3 V and VD = 1.8 V?

No-ADC128S022 requires VD ≤ VA, and VD must be ≥2.7 V per the Recommended Operating Conditions table. Therefore, VD = 1.8 V is outside specification. Valid configurations include VA = VD = 3.3 V, or VA = 5 V and VD = 3.3 V. Using VD < 2.7 V risks functional failure or increased DNL/INL error.