ADS1217IPFBTG4

Overview

The ADS1217IPFBTG4 is a high-precision, low-power analog-to-digital converter featuring eight differential input channels and 24-bit resolution. It utilizes a delta-sigma architecture with an integrated programmable gain amplifier (PGA) to support direct connection to various sensors. The device operates on a single supply voltage ranging from 2.7 V to 5.25 V for both analog and digital domains. Key electrical specifications include a maximum sampling rate of 780 samples per second, integral nonlinearity of 0.0012% FSR, and differential nonlinearity of ±1 LSB. It offers power consumption as low as 800 µW and includes built-in excitation current sources, GPIO pins, and a 50/60 Hz rejection filter.

Feature Summary

• Integrates eight differential inputs with a programmable gain amplifier for flexible sensor interfacing
• Provides high accuracy with 24-bit resolution and low noise performance suitable for precision measurements
• Includes dedicated excitation current sources to simplify bridge sensor applications without external components
• Features a digital filter with selectable 50 Hz and 60 Hz notch rejection for mains interference suppression

Applications

• Industrial process control systems requiring multi-channel temperature or pressure monitoring
• Weighing scales and load cell measurement platforms utilizing bridge sensors
• Medical instrumentation such as electrocardiogram (ECG) and physiological signal acquisition devices
• Portable battery-powered test and measurement equipment due to ultra-low power consumption

Procurement Notes

Verify the suffix 'G4' indicates lead-free and RoHS compliance status consistent with Texas Instruments standards. Confirm the package designation 'IPFB' corresponds to the 48-pin TQFP form factor. Ensure the operating environment falls within the specified -40°C to +85°C temperature range. Cross-reference the datasheet revision date to confirm pinout and electrical characteristics have not changed in newer revisions.

Selection Notes

Select this component when eight simultaneous differential channels are required with high resolution. Consider the internal PGA settings to match the specific sensor output voltage levels. Evaluate the trade-off between sampling speed and noise performance based on the available filtering options. Verify that the SPI interface timing requirements align with the host microcontroller capabilities.

Part Context

This part belongs to the ADS121x family of precision ADCs from Texas Instruments. It shares architectural similarities with the ADS1216 and ADS1218 but distinguishes itself by offering eight input channels instead of two or four. The IPFBTG4 variant represents the tape-and-reel packaging option with green (lead-free/RoHS) materials, differing from the tube-packaged IPFBT version.

Replacement Considerations

• ADS1217IPFBT
• ADS1217IPFBR

FAQ

Does the ADS1217IPFBTG4 support single-ended inputs?

Yes, while optimized for differential inputs, the device can be configured for single-ended measurements by connecting unused channels appropriately.

What is the function of the integrated IDACs?

The integrated excitation current sources (IDACs) provide stable current to energize bridge sensors, eliminating the need for external current source circuitry.

How does the device handle power supply variations?

The ADS1217IPFBTG4 operates with a single supply voltage between 2.7 V and 5.25 V, allowing flexibility in system design while maintaining performance across this range.