Texas Instruments ADS1243IPWTG4

Overview

ADS1243IPWTG4 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) with gains 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 ADS1243IPWTG4 datasheet, ADS1243IPWTG4 pinout, ADS1243IPWTG4 application, or ADS1243IPWTG4 equivalent, key selection considerations include its 21-bit effective resolution at PGA = 1, differential reference support (0.1V–5V), single-cycle settling digital filter, and TSSOP-20 package with integrated burnout current sources for open/short sensor detection.

Technical Context

The ADS1243IPWTG4 implements a second-order delta-sigma modulator with a 1279-tap FIR digital filter, enabling simultaneous 50Hz and 60Hz notch rejection at selectable output 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 (5 GΩ impedance when enabled), programmable 8-bit offset DAC (±VREF/(2•PGA) range), and self/system calibration commands (SELFCAL, SYSGCAL) that correct internal and external gain/offset 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 precision delta-sigma ADC applications.

Compared with ADS1242IPW, ADS1243IPWTG4 provides double the configurable I/O channels without sacrificing noise performance or calibration capability; versus AD7195BRUZ, it offers lower power and simpler system integration where 24-bit resolution suffices and external excitation is already available.

Availability

ADS1243IPWTG4 is available at Aetrix Electronics and suitable for industrial process control, liquid/gas chromatography, blood analysis, smart transmitters, and portable instrumentation requiring stable component supply and long-term manufacturability.

Supply support for ADS1243IPWTG4 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 and industrial-grade IC design.

The ADS124x family was engineered specifically for high-resolution, low-power sensor measurement in harsh industrial and medical environments - emphasizing noise immunity, fault detection, and calibration flexibility over raw speed.

FAQ

What is the maximum sampling rate of the ADS1243IPWTG4?

The ADS1243IPWTG4 supports programmable output data rates of 3.75 Hz, 7.5 Hz, and 15 Hz when using a 2.4576 MHz crystal. Higher master clock frequencies (e.g., 4.9152 MHz) scale these rates proportionally - up to 30 Hz at 15 Hz × 2 - but maintain the same 50/60 Hz rejection profile. The device does not support continuous high-speed sampling; its architecture prioritizes noise rejection and resolution over bandwidth.

Does the ADS1243IPWTG4 require an external crystal?

The ADS1243IPWTG4 supports multiple clock sources: external crystal (2.4576 MHz or 4.9152 MHz), external CMOS clock, or ceramic resonator. XIN/XOUT pins are used only with crystals; if using an external clock, connect it directly to XIN and leave XOUT unconnected. No crystal is mandatory - a clean, stable external clock meeting timing specs (tOSC = 200–1000 ns) is fully compliant.

How does the burnout current feature work on the ADS1243IPWTG4?

The ADS1243IPWTG4 integrates two 2 µA burnout current sources - one tied to AIN+ and one to AIN–. When enabled via the SETUP register, they force open-circuit sensors to rail (outputting 0x7FFFFF) and shorted sensors to mid-scale (~0x000000), providing immediate hardware-level fault detection without software polling. This simplifies safety-critical diagnostics in blood analysis and process control systems.

Can the ADS1243IPWTG4 operate with a 3.3V supply?

Yes, the ADS1243IPWTG4 operates across 2.7V–5.25V. At 3.3V, typical supply current is 240–375 µA (PGA = 1, buffer ON), delivering 21-bit effective resolution and maintaining full 50/60 Hz rejection. Reference input range adjusts accordingly: VREF must be 0.1V–1.25V (RANGE = 0) or 0.1V–2.5V (RANGE = 1), preserving ratiometric accuracy with 3.3V-compatible references.

Is the ADS1243IPWTG4 pin-compatible with the ADS1242IPW?

No - the ADS1243IPWTG4 uses a 20-pin TSSOP package with AIN4–AIN7 routed to pins 9–12 and AIN2/D2–AIN3/D3 shifted to pins 13–14, while the ADS1242IPW uses a 16-pin TSSOP with only AIN0–AIN3. PCB layout and footprint are incompatible; migration requires board revision. Both share identical register maps and functional behavior for common pins (VDD, DRDY, SPI, etc.).