Texas Instruments ADS1217IPFBTG4

Overview

ADS1217IPFBTG4 from Texas Instruments is a 24-bit delta-sigma analog-to-digital converter with 8-channel multiplexed inputs, programmable gain amplifier (PGA) from 1 to 128, on-chip 1.25V/2.5V reference, SPI interface, and integrated burnout current sources for sensor fault detection - used in high-precision industrial process control, chromatography, and portable instrumentation.

For engineers reviewing the ADS1217IPFBTG4 datasheet, ADS1217IPFBTG4 pinout, ADS1217IPFBTG4 application, or ADS1217IPFBTG4 equivalent, key selection criteria include effective resolution (22 bits at PGA=1), INL ≤ 0.0012% FSR, single-cycle settling mode, ±2VREF full-scale input range, and TQFP-48 package compatibility with industrial temperature range (–40°C to +85°C).

Technical Context

The ADS1217IPFBTG4 implements a 2nd-order delta-sigma modulator with selectable sinc2/sinc3/fast-settling digital filters and supports ratiometric measurements via differential VREF± inputs. Its internal architecture integrates an 8-bit offset DAC, two independent 8-bit IDACs (with RDAC-based current scaling), and buffer-enabling circuitry for high-impedance transducer interfacing.

Calibration is supported via self-offset/gain and system-level commands requiring external zero/full-scale stimuli; all calibrations complete in 7 tDATA cycles. The device operates from dual supplies (AVDD = 2.7–5.25V, DVDD = 2.7–5.25V) and features eight configurable digital I/O pins alongside dedicated DRDY, DSYNC, and PDWN control signals.

Key Specifications

Pinout & Package

TQFP-48 package (PFB designation), 7 mm × 7 mm, 0.5 mm pitch, thermally enhanced with exposed thermal pad; rated for –40°C to +85°C operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS1217IPFBTG4, ADS1220IPWR trades channel count and excitation capability for footprint and power savings, while AD7124-8BCPZ adds robustness and diagnostics at the expense of missing the integrated offset DAC and flexible filter auto-mode.

Availability

ADS1217IPFBTG4 is available at Aetrix Electronics and suitable for industrial process control, liquid/gas chromatography, and portable instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADS1217IPFBTG4 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 ADS1217IPFBTG4 belongs to TI's high-accuracy delta-sigma ADC product line, engineered specifically for demanding measurement applications where resolution, noise immunity, and integrated signal-conditioning features reduce system-level design complexity.

FAQ

What is the maximum achievable effective resolution of the ADS1217IPFBTG4 and under what conditions?

The ADS1217IPFBTG4 achieves 22 bits effective resolution at PGA = 1 with sinc3 filter and 10 Hz data rate, and 19 bits at PGA = 128. This is confirmed in the datasheet's typical characteristics (SBAS260C, Figure 1). The effective resolution degrades predictably with higher data rates or faster filters - for example, fast-settling mode yields ~18 bits at 1 kHz. ADS1217IPFBTG4 maintains no-missing-codes performance across its full 24-bit range regardless of PGA setting.

Does the ADS1217IPFBTG4 support true differential input measurements across all eight channels?

Yes - the ADS1217IPFBTG4 supports fully differential measurements by pairing any two channels (e.g., AIN0+ and AIN1–) via its flexible input multiplexer. The datasheet explicitly states "up to eight fully differential input channels" are possible (SBAS260C, p. 12). Each differential pair shares the same common-mode rejection architecture, delivering ≥130 dB CMRR at 60 Hz when configured with sinc3 filtering and proper layout.

How does the burnout current feature work on the ADS1217IPFBTG4 and what is its purpose?

The ADS1217IPFBTG4 integrates two 2 µA burnout current sources - one sourcing from the selected positive input (e.g., AIN0), one sinking from the selected negative input (e.g., AIN1). When enabled via the ACR register, they detect open circuits (full-scale output) or shorts (near-zero differential reading). This functionality is documented in the "Burnout Current Sources" section (SBAS260C, p. 12) and is used for automated sensor health monitoring in smart transmitters and weigh scales.

Can the ADS1217IPFBTG4 operate with a single 3.3 V supply, and what are the implications for reference voltage?

Yes - ADS1217IPFBTG4 supports AVDD = 2.7 V to 3.3 V. At 3.3 V, the on-chip reference defaults to 1.25 V (REF HI = 0), as specified in the "ON-CHIP VOLTAGE REFERENCE" table (SBAS260C, p. 5). Full-scale input becomes ±2.5 V / PGA, and VREFOUT regulation remains stable with <15 ppm/°C drift. Using external 2.5 V reference is possible but requires disabling the internal reference and connecting externally to VREFOUT.

What calibration modes are supported by the ADS1217IPFBTG4 and how are they initiated?

The ADS1217IPFBTG4 supports self-calibration (offset + gain, offset-only, or gain-only) and system calibration (external zero/full-scale stimuli). All calibrations are initiated via SPI command writes to the CMD register and complete in exactly 7 tDATA periods (SBAS260C, p. 14). Self-calibration corrects internal ADC errors; system calibration compensates for external gain/offset errors in the entire signal chain - both are required after power-up, PGA change, or decimation ratio update.