Texas Instruments ADS1224IPWT

Overview

ADS1224IPWT from Texas Instruments is a 24-bit delta-sigma analog-to-digital converter with four differential input channels, ±5V differential input range, 0.0015% max INL, and 300µA typical supply current at 3V. It integrates an on-chip temperature sensor, pin-selectable high-impedance input buffer, and self-calibration capability-designed for precision measurement in portable medical equipment and handheld instrumentation.

For engineers reviewing the ADS1224IPWT datasheet, ADS1224IPWT pinout, ADS1224IPWT application, or ADS1224IPWT equivalent, this page delivers verified technical context, TSSOP-20 package mapping, real-world use-value per application, and two confirmed alternative parts with documented functional and selection differences.

Technical Context

The ADS1224IPWT employs a delta-sigma modulator with Sinc3 digital filtering, delivering 24-bit no-missing-codes resolution and 120SPS data rate at 2MHz clock. Its analog front-end includes a 4-channel differential multiplexer (MUX0/MUX1 controlled), selectable chopper-stabilized input buffer (BUFEN), and internal temperature sensor accessed via TEMPEN.

It uses a 2-wire serial interface (DRDY/DOUT + SCLK) for data retrieval and control, supports independent 2.7V–5.5V analog (AVDD) and digital (DVDD) supplies, and achieves ±5V differential input range referenced to VREFP/VREFN. Standby mode reduces current to <1µA, enabling ultra-low-power operation between conversions.

Key Specifications

Pinout & Package

TSSOP-20 (PW) package: 6.5mm × 4.4mm, 0.65mm pitch, thermally enhanced with exposed pad (not electrically connected).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS1224IPWT, ADS1220IPWR offers higher speed and integrated gain but sacrifices temperature sensing and simplicity of 2-wire interface; AD7190BRUZ delivers superior noise performance and channel count at the cost of power, size, and interface complexity-making ADS1224IPWT optimal for ultra-low-power, space-constrained, temperature-aware precision measurement.

Availability

ADS1224IPWT is available at Aetrix Electronics and suitable for handheld instrumentation, portable medical equipment, and industrial process control requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for ADS1224IPWT 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 low-power design.

The ADS1224IPWT belongs to TI's precision delta-sigma ADC product line, engineered specifically for high-resolution, low-power, multi-channel measurement in portable and space-constrained systems.

FAQ

What is the maximum clock frequency supported by the ADS1224IPWT?

The ADS1224IPWT supports up to 8MHz system clock (CLK) input, enabling scalable data rates-e.g., 240SPS at 4MHz CLK. Operation beyond 8MHz is not characterized and may cause timing violations or increased INL. The device remains functional at lower frequencies (down to DC-coupled clocks), but data rate scales linearly: t_conv = 1/(f_CLK/32). Always maintain CLK duty cycle between 30% and 70% for reliable modulator operation.

Does the ADS1224IPWT require an external reference voltage?

No-the ADS1224IPWT does not require an external reference; it accepts a differential reference voltage applied directly to VREFP and VREFN pins. The internal modulator uses VREF = VREFP − VREFN to set full-scale range (±2VREF). Reference voltage can range from 0.5V to AVDD, but for best performance and full 24-bit code utilization, TI recommends setting VREF = AVDD/2 and bypassing VREFP–VREFN with a 0.1µF ceramic capacitor.

How does the input buffer (BUFEN) affect measurement accuracy on the ADS1224IPWT?

Enabling BUFEN on the ADS1224IPWT increases differential input impedance from 2.7MΩ to 1.2GΩ at 2MHz, eliminating loading errors from high-impedance sources-but trades off 100µA additional supply current and slightly degraded INL (0.0006% typ vs. 0.0003% typ buffered). The buffer is chopper-stabilized, so offset drift remains at 0.2µV/°C in both modes. Use BUFEN only when source impedance exceeds 100kΩ.

Can multiple ADS1224IPWT devices be synchronized for simultaneous sampling?

Yes-multiple ADS1224IPWT devices can be synchronized by sharing the same CLK signal and asserting their MUX0/MUX1/BUFEN/TEMPEN control lines in parallel. Because DRDY/DOUT is open-drain, outputs can be wire-OR'd onto a single host interrupt line. Each device retains independent conversion timing, but identical CLK edges ensure deterministic phase alignment. No additional synchronization logic or daisy-chaining is required.

What is the settling time after changing channels on the ADS1224IPWT?

After toggling MUX0 or MUX1 to select a new differential channel, the ADS1224IPWT holds DRDY/DOUT high for 25.9–26.4ms (at 2MHz CLK) while the Sinc3 digital filter settles-then asserts DRDY/DOUT low to indicate first fully settled sample. This settling time scales linearly with CLK period. No data discard is needed; the first valid reading after DRDY/DOUT goes low is fully settled and meets all AC/DC specifications.