Texas Instruments ADS1243IPWRG4

Overview

ADS1243IPWRG4 from Texas Instruments is a 24-bit delta-sigma analog-to-digital converter (ADC) with simultaneous 50Hz/60Hz rejection (≥–90dB), 0.0015% INL, and up to eight configurable analog input/data I/O channels. It features a programmable gain amplifier (PGA) from 1 to 128, on-chip offset DAC, and SPI-compatible serial interface - designed for high-precision sensor measurement in industrial process control and portable instrumentation.

For engineers reviewing the ADS1243IPWRG4 datasheet, ADS1243IPWRG4 pinout, ADS1243IPWRG4 application, or ADS1243IPWRG4 equivalent, key selection considerations include its 21-bit effective resolution at PGA=1, differential reference support (0.1V–5V), single-cycle settling filter, burnout current sources for sensor fault detection, and TSSOP-20 package compatibility with layout-constrained PCBs.

Technical Context

The ADS1243IPWRG4 implements a second-order delta-sigma modulator with a 1279-tap FIR digital filter enabling simultaneous 50Hz and 60Hz notch rejection at selectable data rates (3.75Hz/7.5Hz/15Hz). Its multiplexed input architecture supports up to four independent differential or seven single-ended channels via reconfigurable AINx/Dx pins.

It integrates a chopper-stabilized FET-input buffer (5GΩ impedance when enabled), 2µA burnout current sources per input, and an 8-bit sign-magnitude offset DAC with ±VREF/(2•PGA) range. Calibration commands (SELFCAL, SYSOCAL, SYSGCAL) correct internal and system-level offset/gain errors without requiring external components.

Key Specifications

Pinout & Package

TSSOP-20 package with 0.65 mm pitch; thermally enhanced exposed pad (not electrically connected); RoHS-compliant lead finish.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-resolution delta-sigma ADC applications.

Compared with ADS1242IPWR and AD7195BRUZ, the ADS1243IPWRG4 uniquely balances eight flexible I/O pins, on-chip burnout detection, and production-proven 24-bit metrology performance in a TSSOP-20 package - making it optimal for cost-sensitive, multi-sensor industrial and medical devices requiring robust fault handling.

Availability

ADS1243IPWRG4 is available at Aetrix Electronics and suitable for industrial process control, liquid/gas chromatography, and portable instrumentation requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for ADS1243IPWRG4 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 acquisition solutions.

The ADS124x family was engineered specifically for high-accuracy, low-power sensor signal conditioning in smart transmitters and portable test equipment - emphasizing integrated diagnostics, flexible I/O, and mains-frequency immunity.

FAQ

What is the maximum differential input voltage range supported by the ADS1243IPWRG4?

The ADS1243IPWRG4 supports a differential input voltage range of ±VREF/PGA (RANGE = 0) or ±VREF/(2•PGA) (RANGE = 1), where VREF is the external differential reference voltage. With VREF = 2.5 V and PGA = 1, this yields ±2.5 V full-scale range. The absolute input voltage on any AINx pin must remain between GND + 0.05 V and VDD – 1.5 V when the input buffer is enabled.

Does the ADS1243IPWRG4 require an external crystal, or can it operate with an external clock source?

The ADS1243IPWRG4 supports both crystal and external clock sources. When using a crystal (e.g., 2.4576 MHz or 4.9152 MHz), XIN and XOUT pins connect to the crystal and load capacitors. For external clock operation, only XIN is used - XOUT is left unconnected. The device derives its modulator clock (fMOD) internally via division, supporting data rates of 3.75 Hz, 7.5 Hz, or 15 Hz depending on SPEED bit and fOSC configuration.

How does the burnout current feature work on the ADS1243IPWRG4, and what failure modes does it detect?

The ADS1243IPWRG4 provides two 2 µA burnout current sources - one connected to AIN+ and one to AIN–. When activated (BOCS bit = 1), an open-circuited sensor pulls AIN+ to VDD and AIN– to GND, resulting in full-scale output (0x7FFFFF). A shorted sensor forces both inputs to the same potential (~VDD/2), producing near-zero output. This enables automatic detection of wiring faults without additional circuitry.

Can the ADS1243IPWRG4 perform conversions while some of its AINx/Dx pins are configured as digital I/O?

Yes - the ADS1243IPWRG4 allows concurrent ADC operation and digital I/O use. Pins configured as data I/O via the IOCON register retain analog functionality: an A/D conversion can be performed on a pin driven externally (e.g., for self-test), or the pin can serve as GPIO while other channels are actively sampled. Direction is controlled per-pin via DIR and output state via DIO registers.

What calibration modes are supported by the ADS1243IPWRG4, and when should each be used?

The ADS1243IPWRG4 supports SELFCAL (offset + gain), SELFOCAL (offset only), and SELFGCAL (gain only) for internal calibration, plus SYSOCAL (system offset) and SYSGCAL (system gain) for end-to-end correction. SELFCAL is recommended after power-up; SYSOCAL/SYSGCAL are used with known zero/full-scale inputs to compensate for external sensor and signal chain errors - especially critical at high PGA settings where external gain drift dominates.