Texas Instruments ADS1174IPAPT

Overview

ADS1174IPAPT from Texas Instruments is a quad-channel, simultaneous-sampling, 16-bit delta-sigma analog-to-digital converter (ADC) with 52kSPS high-speed mode and 10.5kSPS low-power mode. It features 97dB SNR, ±0.3LSB INL, 2µV/°C offset drift, and operates from –40°C to +105°C in an HTQFP-64 PowerPAD™ package. It is used in precision power monitoring and medical ECG systems requiring synchronized multi-channel acquisition.

For engineers reviewing the ADS1174IPAPT datasheet, ADS1174IPAPT pinout, ADS1174IPAPT application, or ADS1174IPAPT equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative options - all grounded in TI's SBAS373B datasheet and official package documentation.

Technical Context

The ADS1174IPAPT integrates four independent 6th-order chopper-stabilized delta-sigma modulators with on-chip linear-phase FIR filters, enabling true simultaneous sampling across all channels. Its modulator sampling rate is 64× the output data rate (fMOD/fDATA = 64), supporting both high-speed (27MHz CLK, 52.7kSPS) and low-power (13.5MHz/5.4MHz CLKDIV, 10.5kSPS) operation modes.

It supports dual serial interfaces - SPI and Frame-Sync - with daisy-chain capability via DIN/DOUT[4:1], and uses pin-driven configuration (MODE, FORMAT[2:0], CLKDIV) without internal registers. Synchronization is achieved via SYNC input, and DRDY/FSYNC serves as either frame clock (Frame-Sync) or data-ready flag (SPI).

Key Specifications

Pinout & Package

ADS1174IPAPT is housed in an HTQFP-64 PowerPAD™ package (PAP), with exposed thermal pad soldered to PCB ground plane for enhanced thermal performance and EMI reduction.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad-channel simultaneous-sampling ADC applications.

Compared with ADS1274IPAPT, ADS1174IPAPT trades 8-bit resolution for 55% lower power and simpler anti-aliasing; versus AD7606BSTZ, it delivers guaranteed inter-channel phase match but requires external reference and differential front-end design.

Availability

ADS1174IPAPT is available at Aetrix Electronics and suitable for 3-phase power monitors, portable ECG systems, and Coriolis flow meters requiring stable component supply, long-term production continuity, and extended-temperature-grade assurance.

Supply support for ADS1174IPAPT 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 high-reliability ICs for industrial, automotive, and medical applications.

The ADS1174IPAPT belongs to TI's high-precision delta-sigma ADC product line, engineered for applications demanding simultaneous multi-channel acquisition, low drift, and robust AC performance in harsh environments.

FAQ

What is the maximum master clock frequency supported by ADS1174IPAPT?

The ADS1174IPAPT supports a maximum master clock (CLK) frequency of 27MHz. This applies to both high-speed and low-power modes. When CLKDIV = 0, the internal modulator clock is fCLK/4 (6.75MHz in high-speed mode) or fCLK/40 (675kHz in low-power mode). Exceeding 27MHz violates absolute maximum ratings and may cause timing violations or permanent damage to the ADS1174IPAPT.

Does ADS1174IPAPT require external configuration registers to operate?

No, the ADS1174IPAPT uses pin-driven configuration - no SPI register writes are needed for basic operation. Mode selection (high-speed/low-power), serial interface type (SPI/Frame-Sync), and TDM format are set directly via MODE, FORMAT[2:0], and CLKDIV pins. This simplifies firmware development and eliminates boot-time initialization sequences required by the ADS1174IPAPT.

What is the function of the VCOM pin on ADS1174IPAPT?

The VCOM pin on ADS1174IPAPT outputs an unbuffered AVDD/2 voltage (e.g., 2.5V when AVDD = 5V), intended as a common-mode bias reference for differential driver circuits. It is not a precision voltage source - its output impedance is high and load regulation is poor. For driving ADS1174IPAPT's AINP/AINN inputs, VCOM provides a stable midpoint reference without requiring an external op-amp buffer.

Can ADS1174IPAPT perform true simultaneous sampling across all four channels?

Yes, the ADS1174IPAPT performs true simultaneous sampling: all four delta-sigma modulators share the same CLK edge and are synchronized via internal logic so that sampling apertures align within <100ps. The digital filters are also aligned to begin convolution at the same modulator clock cycle, ensuring zero inter-channel phase skew - a critical feature confirmed in the ADS1174IPAPT datasheet's functional description and timing diagrams.

What is the recommended power supply sequencing for ADS1174IPAPT?

Texas Instruments specifies no strict power-up sequence for ADS1174IPAPT, but recommends that AVDD be applied before or simultaneously with DVDD and IOVDD. AGND and DGND should be connected to a common ground plane with low-inductance stitching. Applying DVDD or IOVDD before AVDD may cause undefined behavior during startup; therefore, ensure AVDD reaches regulation first to guarantee proper internal biasing of the ADS1174IPAPT's analog core.