Texas Instruments ADCS7476AIMFX

Overview

ADCS7476AIMFX from Texas Instruments is a 12-bit, 1-MSPS successive-approximation analog-to-digital converter (SAR ADC) with internal track-and-hold, single-supply operation (2.7 V to 5.25 V), SPI/QSPI/MICROWIRE-compatible serial interface, and supply-as-reference architecture enabling 0–VDD input range. It delivers ±0.4 LSB typical INL, 72 dB SINAD at 100 kHz, and 2 mW power consumption at 3 V - used in automotive navigation sensor front-ends and portable medical instrumentation.

For engineers reviewing the ADCS7476AIMFX datasheet, ADCS7476AIMFX pinout, ADCS7476AIMFX application, or ADCS7476AIMFX equivalent, key selection criteria include guaranteed no-missing-codes 12-bit resolution over −40°C to 125°C, 20 MHz max SCLK timing compliance, shutdown mode reducing current to <0.5 µA, and 6-pin SOT-23 footprint for space-constrained embedded signal acquisition.

Technical Context

The ADCS7476AIMFX implements a charge-redistribution SAR architecture with integrated track-and-hold, where sampling occurs on the falling edge of CS and conversion completes within 16 SCLK cycles. Its reference is tied directly to VDD, eliminating external reference components while maintaining full-scale linearity across supply variation.

Serial communication uses a 4-zero-leading, 12-bit natural binary output format clocked on SCLK falling edges; SDATA enters tri-state after the 16th falling edge or rising CS edge. The device supports 1 MSPS throughput with aperture jitter of 30 ps and 400 ns track/hold acquisition time - optimized for DC-coupled sensor interfacing and medium-bandwidth control loop sampling.

Key Specifications

Pinout & Package

ADCS7476AIMFX is housed in a 6-pin SOT-23 package (1.60 mm × 2.90 mm body size), optimized for high-density PCB layouts in automotive and portable systems.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7476AARMZ and ADS7822U, ADCS7476AIMFX uniquely combines 1-MSPS speed, supply-as-reference simplicity, 6-pin SOT-23 miniaturization, and −40°C to 125°C qualification - making it optimal for space- and thermal-constrained automotive and portable embedded systems requiring deterministic 12-bit acquisition.

Availability

ADCS7476AIMFX is available at Aetrix Electronics and suitable for automotive navigation sensor interfaces, portable medical instrumentation, and industrial motor control feedback requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADCS7476AIMFX 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 broad industrial and automotive qualification expertise.

The ADCS747x family was designed specifically for high-reliability, space-constrained signal acquisition in automotive and extended-temperature industrial systems - emphasizing low power, supply-as-reference integration, and drop-in replacement capability for legacy AD747x converters.

FAQ

What is the maximum sampling rate supported by the ADCS7476AIMFX?

The ADCS7476AIMFX supports a maximum sampling rate of 1 MSPS (mega-samples per second), verified across −40°C to 125°C with 20 MHz SCLK operation. This rate is achieved using a fixed 16-clock-cycle serial readout sequence, where each conversion completes within one SCLK period at 20 MHz. At lower SCLK frequencies, throughput scales linearly - e.g., 10 MHz SCLK yields 625 kSPS. The ADCS7476AIMFX datasheet specifies this performance under recommended operating conditions with VDD = 2.7 V to 5.25 V.

Does the ADCS7476AIMFX require an external voltage reference?

No, the ADCS7476AIMFX does not require an external voltage reference. It uses its VDD supply as the reference, establishing a full-scale input range of 0 V to VDD. This architecture eliminates external reference components, reduces BOM count, and avoids reference drift errors - while maintaining ±0.4 LSB typical INL over temperature. The ADCS7476AIMFX datasheet confirms this supply-as-reference behavior in Section 3 (Description) and Electrical Characteristics Table 6.5.

What is the pin configuration and package type of the ADCS7476AIMFX?

The ADCS7476AIMFX uses a 6-pin SOT-23 package (DBV) with 1.60 mm × 2.90 mm body size. Pin 1 is VDD, Pin 2 is GND, Pin 3 is VIN, Pin 4 is SCLK, Pin 5 is SDATA, and Pin 6 is CS - as defined in the TI SNAS192G datasheet Figure 3 (Pin Configuration and Functions). This compact footprint supports high-density PCB layouts in automotive and portable applications where board space is constrained.

How does the ADCS7476AIMFX enter and exit shutdown mode?

The ADCS7476AIMFX enters shutdown mode when CS remains high and SCLK is inactive; it draws <0.5 µA at 5 V (2.5 µW). To exit shutdown, assert a falling edge on CS - which initiates conversion, releases SDATA from tri-state, and powers up internal circuitry within 1 µs (tPOWER-UP). The ADCS7476AIMFX datasheet specifies these timing and current values in Sections 6.5 (Electrical Characteristics) and 6.8 (Timing Requirements).

Is the ADCS7476AIMFX compatible with standard SPI interfaces?

Yes, the ADCS7476AIMFX is fully compatible with SPI, QSPI, and MICROWIRE serial interfaces. Its CS, SCLK, and SDATA pins conform to standard SPI timing: CS acts as frame sync, SCLK controls data clocking on falling edges, and SDATA outputs 4 leading zeros followed by 12 MSB-first data bits. No mode configuration is needed - the ADCS7476AIMFX operates in SPI Mode 0 (CPOL = 0, CPHA = 0) as confirmed in TI SNAS192G Section 7.3 and Figure 2.