Texas Instruments ADCS7476AIMF

Overview

ADCS7476 from Texas Instruments is a 12-bit successive-approximation analog-to-digital converter (SAR ADC) with internal track-and-hold, 1-MSPS throughput, ±0.4 LSB typical INL, 72 dB SINAD at 100 kHz, and single-supply operation from 2.7 V to 5.25 V. It uses the supply voltage as reference (0–VDD input range) and targets space-constrained, low-power systems requiring precision digitization of analog sensor or control signals.

For engineers reviewing the ADCS7476 datasheet, ADCS7476 pinout, ADCS7476 application, or ADCS7476 equivalent, key selection considerations include its 6-pin SOT-23 footprint, SPI/QSPI/MICROWIRE-compatible serial interface, shutdown mode reducing power to <5 µW, automotive-grade −40°C to 125°C operation, and drop-in compatibility with AD747x-series converters.

Technical Context

The ADCS7476 implements a charge-redistribution SAR architecture with integrated track-and-hold, enabling accurate sampling at up to 1 MSPS. Conversion timing is fully synchronous to the external SCLK (up to 20 MHz), with 16 clock cycles required per 12-bit result - four leading zeros followed by twelve data bits, MSB-first, output on SDATA falling edges.

It operates in two functional modes: track (input sampled continuously) and hold (sample frozen at CS falling edge). Mode transition occurs on the 13th rising SCLK edge after CS assertion, and SDATA enters tri-state after the 16th falling SCLK edge or rising CS edge - whichever occurs first. Power management is controlled via chip-select-driven shutdown.

Key Specifications

Pinout & Package

ADCS7476 is housed in a 6-pin SOT-23 package (1.60 mm × 2.90 mm body), optimized for ultra-compact PCB layouts in portable and automotive modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7476AARMZ and ADS7822U, ADCS7476 offers the smallest footprint, highest throughput, lowest power at 1 MSPS, and supply-as-reference simplicity - making it optimal for next-generation compact, high-performance embedded data acquisition.

Availability

ADCS7476 is available at Aetrix Electronics and suitable for automotive navigation sensors, portable medical monitoring devices, industrial motor control feedback systems, and factory automation analog I/O modules requiring stable component supply across extended temperature ranges.

Supply support for ADCS7476 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, embedded processing, and connectivity technologies, with decades of expertise in precision data converters and automotive-qualified ICs.

The ADCS747x family was designed specifically for space-constrained, low-power industrial and automotive applications demanding high-speed, high-accuracy digitization without external references or support components.

FAQ

What is the maximum clock frequency supported by ADCS7476 for reliable 1-MSPS operation?

The ADCS7476 supports SCLK frequencies up to 20 MHz across −40°C to 125°C, with guaranteed 1-MSPS throughput at 20 MHz. At this rate, 16 clock cycles complete each conversion, yielding precisely 1 million samples per second. Operation above 20 MHz may cause timing violations in SDATA setup/hold windows, especially at temperature extremes - always verify timing margins using t4, t7, and t8 values from the datasheet's Table 6.8.

Does ADCS7476 require an external voltage reference?

No, ADCS7476 does not require an external voltage reference. It uses the VDD supply as its reference, establishing a full-scale input range of 0 V to VDD. This eliminates external reference components, reduces BOM count, and simplifies layout - but means LSB size scales with VDD (e.g., 1.22 mV/LSB at 5 V, 0.73 mV/LSB at 3 V). System-level accuracy depends on VDD stability and bypassing quality.

How does the ADCS7476 enter and exit shutdown mode?

The ADCS7476 enters shutdown mode when CS remains high and SCLK is inactive (stopped); current drops to 0.5 µA (5 V) or 0.6 µA (3 V). To exit shutdown, apply a valid CS pulse - the falling edge of CS initiates both wake-up and conversion. Total wake-up time is ≤1 µs (tPOWER-UP), after which the device is ready for immediate sampling. No separate wake-up command is needed.

What is the data format and timing sequence for reading a conversion result from ADCS7476?

ADCS7476 outputs a 16-bit frame on SDATA: four leading zeros followed by twelve 12-bit data bits (MSB first), all clocked out on falling SCLK edges. The first data bit appears on the first falling SCLK after CS goes low. The 12th data bit is valid on the 16th falling SCLK edge. SDATA returns to tri-state either after that edge or upon CS rising - whichever occurs first. No trailing zeros are added.

Can ADCS7476 interface directly with a microcontroller GPIO without level-shifting?

Yes, ADCS7476 can interface directly with most 3.3 V or 5 V microcontrollers. Its digital inputs (CS, SCLK) accept VIH ≥ 2.4 V and VIL ≤ 0.8 V (at 5 V) or ≤ 0.4 V (at 3 V), matching standard CMOS logic thresholds. SDATA output swings from 0.4 V (low) to VDD − 0.2 V (high), compatible with MCU inputs rated for rail-to-rail CMOS levels. No level-shifting is required when VDD matches the MCU I/O voltage.