Texas Instruments ADC128S052CIMT

Overview

ADC128S052CIMT from Texas Instruments is a 12-bit, 8-channel successive-approximation ADC with 200–500 kSPS throughput, independent analog (VA) and digital (VD) supplies (2.7 V to 5.25 V), SPI-compatible serial interface, and integrated track-and-hold. It operates across −40°C to +105°C and is used in automotive navigation sensor signal conditioning.

For engineers reviewing the ADC128S052CIMT datasheet, ADC128S052CIMT pinout, ADC128S052CIMT application, or ADC128S052CIMT equivalent, key selection criteria include channel count, SPI timing compliance (3.2–8 MHz SCLK), power-down current (≤50 nA), INL/DNL performance (±1 LSB max), and TSSOP-16 thermal resistance (RθJA = 110°C/W).

Technical Context

The ADC128S052CIMT implements a charge-redistribution SAR architecture with internal track-and-hold, requiring exactly 16 SCLK cycles per conversion: 3 cycles for acquisition (track mode), 13 for conversion and data output (hold mode). Its straight-binary output is MSB-first, compatible with SPI, QSPI, and MICROWIRE protocols.

It supports two functional modes: continuous conversion (CS low, back-to-back 16-cycle frames) and burst mode (CS toggled per conversion), enabling dynamic power management. VA serves as both analog supply and reference; VD is independently configurable from 2.7 V to VA.

Key Specifications

Pinout & Package

ADC128S052CIMT is housed in a 16-pin TSSOP package (4.40 mm × 5.00 mm body size) with exposed pad not electrically connected. Pin spacing is 0.65 mm; recommended PCB layout includes separate AGND/DGND planes tied at single point near device.

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 MAX11126ETE+, ADC128S052CIMT offers optimal balance of automotive temperature range, supply independence (VA as reference), and proven TSSOP manufacturability - making it preferred for cost-sensitive industrial and automotive sensor hubs where external reference is acceptable.

Availability

ADC128S052CIMT is available at Aetrix Electronics and suitable for automotive navigation systems, portable medical monitors, industrial process controllers, and mobile communications baseband monitoring requiring stable component supply across extended temperature ranges.

Supply support for ADC128S052CIMT 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 automotive-qualified ICs.

The ADC128S052CIMT belongs to TI's precision SAR ADC product line, designed specifically for multi-channel sensor signal acquisition in noise-sensitive, thermally demanding applications such as automotive infotainment and industrial automation.

FAQ

What is the maximum sample rate supported by the ADC128S052CIMT?

The ADC128S052CIMT supports a maximum sample rate of 500 kSPS in continuous conversion mode. This is achieved with an SCLK frequency of up to 8 MHz and requires CS to remain low across consecutive 16-cycle frames. At 500 kSPS, the device delivers 11.3–11.8 effective bits (ENOB) with 70–73 dB SINAD, confirming sustained performance at full throughput. The minimum rate is 200 kSPS, but lower rates are achievable using burst mode with CS toggling.

Does the ADC128S052CIMT require an external voltage reference?

No, the ADC128S052CIMT does not require an external voltage reference. Its VA supply pin serves as both the analog power rail and the internal reference - the full-scale input range is 0 V to VA. This simplifies system design by eliminating reference ICs and associated filtering. VA must be stable and low-noise (bypassed with 1-µF and 0.1-µF ceramics within 1 cm), and can range from 2.7 V to 5.25 V. Using VA as reference ensures inherent tracking of supply variations.

How is channel selection implemented on the ADC128S052CIMT?

Channel selection on the ADC128S052CIMT is performed via the 3-bit ADD2–ADD0 field loaded into the control register through the DIN pin during the first three rising edges of SCLK after CS falls. These bits directly map to inputs IN0–IN7 (e.g., 000 = IN0, 111 = IN7). The selection occurs dynamically per conversion frame, allowing software-controlled sequencing without reconfiguring hardware. No separate command or register write is needed - the address is latched automatically at startup of each conversion cycle.

What are the power consumption characteristics of the ADC128S052CIMT in shutdown mode?

In shutdown mode (CS high), the ADC128S052CIMT draws ≤50 nA total supply current when VA = VD = 5 V, and ≤20 nA at 3 V. This corresponds to power consumption of 0.25 µW (5 V) or 0.06 µW (3 V). The device fully powers down internal clocks, reference buffer, and analog circuitry - only leakage paths remain active. Recovery to full operation occurs within one SCLK cycle after CS goes low, with no power-up delay or dummy conversion required. First valid sample is from IN0.

Is the ADC128S052CIMT pin-compatible with the ADC128S052-Q1 variant?

Yes, the ADC128S052CIMT and ADC128S052-Q1 share identical pinout, package (16-pin TSSOP), and electrical interface. The sole difference is qualification: ADC128S052CIMT is rated for −40°C to +105°C (extended industrial), while ADC128S052-Q1 is AEC-Q100 Grade 1 qualified for −40°C to +125°C ambient operation. Both use the same datasheet (SNAS333E), and PCB layouts designed for ADC128S052CIMT are directly reusable for the Q1 variant in automotive applications requiring higher temperature margin.