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Texas Instruments ADS1217IPFBT
- Part No.:
- ADS1217IPFBT
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-TQFP
- Datasheet:
-
ADS1217IPFBT.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 48TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,157
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Product details
Overview
ADS1217IPFBT from Texas Instruments is a 24-bit, 8-channel delta-sigma analog-to-digital converter with integrated PGA (1–128×), on-chip 1.25 V/2.5 V reference, burnout current sources, offset DAC, and dual 8-bit IDACs. It delivers 22-bit effective resolution at PGA = 1 and supports ratiometric measurements via differential reference inputs. It is used in high-precision industrial sensor signal chains for smart transmitters and chromatography systems.
For engineers reviewing the ADS1217IPFBT datasheet, ADS1217IPFBT pinout, ADS1217IPFBT application, or ADS1217IPFBT equivalent, key selection criteria include guaranteed 24-bit no-missing-codes performance, programmable sinc filtering (Sinc2/Sinc3/Fast), single-cycle settling mode, ±2VREF/PGA full-scale input range, and SPI-compatible serial interface with 8-bit digital I/O.
Technical Context
The ADS1217IPFBT implements a 2nd-order delta-sigma modulator with selectable digital filters (Sinc2, Sinc3, Fast Settling) and supports decimation ratios up to 2048. Its input multiplexer enables fully differential channel pairing across all eight analog inputs (AIN0–AIN7), with configurable buffer enable and burnout current sources (±2 µA) for open/short detection.
It integrates two independent 8-bit current-output DACs (IDAC1/IDAC2) with programmable full-scale ranges (0.5/1/2 mA), an 8-bit offset DAC (±VREF/PGA range), and internal calibration logic supporting self-offset, self-gain, system-offset, and system-gain calibration sequences-each completing in seven tDATA periods.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit no missing codes; guarantees monotonicity and unambiguous digital representation across full dynamic range. |
| Effective Resolution | 22 bits at PGA = 1 (10 Hz output rate); 19 bits at PGA = 128-directly determines smallest resolvable voltage step. |
| INL | Max ±0.0012% of FSR; ensures linearity error remains below 30 ppm over full scale, critical for precision metrology. |
| PGA Gain Range | 1× to 128× in discrete steps (1,2,4,8,16,32,64,128); enables optimal SNR scaling for mV-level sensor outputs. |
| Data Rate | Programmable up to 1 kHz; supports both high-speed transient capture and ultra-low-noise 10 Hz averaging modes. |
| Reference | On-chip selectable 1.25 V or 2.5 V; eliminates external reference component count and improves ratiometric accuracy. |
| Power Consumption | < 1 mW at VDD = 3 V; enables battery-powered portable instrumentation without thermal derating. |
Pinout & Package
TQFP-48 package (PFB suffix), 7 mm × 7 mm, 0.5 mm pitch, thermally enhanced with exposed pad. Pinout validated per TI SBAS260C datasheet Rev. FEBRUARY 2007.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN0–AIN7 | Differential analog input channels | Support any pair as (AIN+, AIN−); enable 8 fully differential inputs or 16 single-ended with AINCOM reference. |
| AINCOM | Common-mode reference node | Provides low-impedance return for buffered single-ended configurations; required when buffer is enabled. |
| VREF+, VREF− | Differential reference inputs | Accept external reference or connect to VREFOUT for ratiometric operation; reject common-mode noise up to 130 dB at 60 Hz. |
| IDAC1, IDAC2 | Current DAC outputs | Provide programmable excitation (0.5/1/2 mA) for 4-wire RTDs or bridge sensors; compliance up to AVDD − 1 V. |
| BUFEN | Input buffer control | Enables high-Z (>1 GΩ) input stage; required for direct connection to high-impedance pH or ion-selective electrodes. |
| DRDY | Data-ready indicator | Active-low pulse signals valid conversion result; synchronizes host MCU read timing without polling overhead. |
| SCLK, DIN, DOUT, CS | SPI interface signals | Full-duplex, Schmitt-triggered; support clock polarity (POL) and phase configuration for legacy controller compatibility. |
| D0–D7 | Configurable digital I/O | Individually set as input/output via DIR register; usable for GPIO, status signaling, or sensor control sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| Single-cycle settling mode | Enables rapid channel switching with deterministic 1-conversion-cycle latency-critical for multi-sensor scanning systems. |
| Auto-filter mode | Automatically sequences Fast → Sinc2 → Sinc3 after channel/PGA change, balancing speed and noise rejection without firmware intervention. |
| On-chip temperature sensor | Diode-based sensing activated via MUX config; enables real-time ambient compensation without external components. |
| Burnout current sources | ±2 µA sourcing/sinking on selected differential pair; provides hardware-level open-circuit (full-scale) and short-circuit (0 V) fault detection. |
| Self- and system-calibration | Offset/gain calibration commands execute in 7 tDATA cycles; supports in-field recalibration after thermal drift or sensor replacement. |
Applications
| Industrial Process Control | Liquid/Gas Chromatography |
|---|---|
Use Scenario: Monitoring pressure, flow, and composition in chemical plant pipelines using 4–20 mA loop sensors and RTD temperature probes. IC Role / Device Role / Timing Role: ADC front-end with integrated IDACs for RTD excitation, PGA for millivolt-level thermocouple amplification, and ratiometric reference for loop-current accuracy. Use Value: 24-bit resolution and 0.0012% INL ensure <±0.02% full-scale measurement uncertainty across 40°C–120°C operating range. |
Use Scenario: Detecting trace analyte concentrations in HPLC/GC detectors via photodiode or electrochemical cell outputs. IC Role / Device Role / Timing Role: Precision digitizer for low-noise, low-drift detector signals; uses Sinc3 filter (10 Hz) and buffer to preserve signal integrity from high-impedance sources. Use Value: 22-bit effective resolution at PGA=1 and 130 dB CMRR at 60 Hz suppress power-line interference in lab-grade instrumentation. |
| Smart Transmitters | Weigh Scales |
Use Scenario: Field-mounted 2-wire transmitter converting 4–20 mA sensor output to digital HART or WirelessHART data stream. IC Role / Device Role / Timing Role: Primary ADC with integrated 1.25 V reference and digital I/O for HART modem control; operates from loop power (3.3 V). Use Value: <1 mW power consumption at 3 V enables full functionality within 3.5 mA loop budget; DRDY simplifies low-power microcontroller wake-up scheduling. |
Use Scenario: Platform scale electronics measuring load cell mV/V output with temperature compensation and tare functionality. IC Role / Device Role / Timing Role: High-resolution ADC with offset DAC for zero-point adjustment, burnout detection for broken load cell wires, and PGA for gain matching across sensor batches. Use Value: Guaranteed 24-bit no-missing-codes performance ensures repeatable 1:1,000,000 resolution (e.g., 0.1 g @ 100 kg capacity) without code gaps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-resolution delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1220IPWR | 4-channel, 24-bit, built-in PGA (1–128×), but no IDACs or burnout sources; lower pin count (16-pin TSSOP). | Lacks dual IDACs and burnout detection-unsuitable for 4-wire RTD or open-wire fault monitoring. | Select when system requires only basic high-res ADC with minimal footprint and no excitation or diagnostics. |
| AD7177-2BRUZ | 8-channel, 32-bit, 10 kSPS max, integrated PGA (1–128×), but no on-chip IDACs or burnout sources; requires external reference. | Higher resolution and speed, but lacks integrated excitation and fault detection-increases BOM and layout complexity. | Select for applications demanding >24-bit resolution and faster throughput where external IDACs and diagnostics are acceptable. |
Compared with ADS1217IPFBT, ADS1220IPWR reduces channel count and removes diagnostic features to shrink size and cost, while AD7177-2BRUZ trades integrated diagnostics and ease of use for higher resolution and speed-requiring external support circuitry.
Availability
ADS1217IPFBT is available at Aetrix Electronics and suitable for industrial process control, liquid/gas chromatography, and smart transmitter designs requiring stable component supply, long-term production continuity, and guaranteed traceable sourcing.
Supply support for ADS1217IPFBT 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 ICs.
The ADS1217IPFBT belongs to TI's high-accuracy delta-sigma ADC product line, designed specifically for industrial sensor signal conditioning where integration of PGA, reference, IDACs, and diagnostics reduces system-level design risk and board area.
FAQ
What is the maximum achievable effective resolution of the ADS1217IPFBT and under what conditions?
The ADS1217IPFBT achieves 22-bit effective resolution at PGA = 1 with Sinc3 filter and 10 Hz output data rate, as confirmed in TI SBAS260C datasheet Figure 8. At PGA = 128, effective resolution drops to 19 bits due to increased noise contribution from the programmable gain amplifier stage. This is measured using ENOB (Effective Number of Bits) methodology with VREF = 2.5 V and buffer enabled.
Does the ADS1217IPFBT support true differential input measurements across all eight channels?
Yes-the ADS1217IPFBT supports fully differential measurements on any combination of its eight analog inputs (AIN0–AIN7) via its flexible input multiplexer. For example, AIN2 can be assigned as AIN+ and AIN5 as AIN−, enabling eight independent differential pairs. This capability is explicitly documented in the "INPUT MULTIPLEXER" section of the SBAS260C datasheet.
How does the burnout current feature work on the ADS1217IPFBT and what fault conditions does it detect?
The ADS1217IPFBT provides ±2 µA burnout current sources that activate when the Burnout bit in the ACR register is set. The positive-side source drives current into AIN+, while the negative-side sink draws current from AIN−. An open sensor yields full-scale output; a short yields near-zero differential voltage-enabling automatic wire-break or short-circuit detection without external circuitry.
Can the ADS1217IPFBT operate from a 3.3 V supply, and what are the reference voltage implications?
Yes-the ADS1217IPFBT operates with AVDD from 2.7 V to 3.3 V. In this range, the on-chip reference defaults to 1.25 V (REF HI = 0), as specified in the "ON-CHIP VOLTAGE REFERENCE" table (page 4, SBAS260C). Using the 2.5 V reference requires AVDD ≥ 4.75 V and is disabled below that threshold.
What calibration modes are supported by the ADS1217IPFBT and how long do they take to complete?
The ADS1217IPFBT supports self-offset, self-gain, system-offset, and system-gain calibration. Each command executes in exactly seven tDATA periods (e.g., 700 ms at 10 Hz data rate). Self-calibration corrects internal ADC errors; system calibration corrects end-to-end errors including sensor and front-end components-both are initiated via SPI command register writes.
ADS1217IPFBT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 48-TQFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 24
- Sampling Rate (Per Second):
- 780
- Number of Inputs:
- 8
- Input Type:
- Differential
- Data Interface:
- SPI
- Configuration:
- MUX-PGA-ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 2.7V ~ 3.3V, 5V
- Voltage - Supply, Digital:
- 2.7V ~ 5.25V
- Features:
- PGA
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 48-TQFP (7x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS1217IPFBT FAQ
1.How can I place an order for ADS1217IPFBT through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS1217IPFBT on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ADS1217IPFBT reliable?
The price and inventory of ADS1217IPFBT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS1217IPFBT is usually 5 days.
3.What payment methods are accepted for ADS1217IPFBT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS1217IPFBT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS1217IPFBT?
ADS1217IPFBT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS1217IPFBT order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ADS1217IPFBT?
For technical support, including ADS1217IPFBT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS1217IPFBT requirements.
6.How does Aetrix verify that ADS1217IPFBT is sourced from the original manufacturer or authorized distributors?
All ADS1217IPFBT products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ADS1217IPFBT meets industry standards.
7.What is the process for return or replacement of ADS1217IPFBT?
All ADS1217IPFBT units undergo pre-shipment inspection (PSI). If there is an issue with ADS1217IPFBT, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ADS1217IPFBT part is unused and in its original packaging.
Return procedure for ADS1217IPFBT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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