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Texas Instruments ADS1146IPWR
- Part No.:
- ADS1146IPWR
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADS1146IPWR.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,588
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Product details
Overview
ADS1146IPWR from Texas Instruments is a 16-bit, 2-kSPS delta-sigma analog-to-digital converter (ADC) with integrated programmable gain amplifier (PGA), single-cycle settling digital filter, and internal oscillator. It supports one differential analog input pair (AINP/AINN), external reference configuration, and sensor burnout detection - designed for high-accuracy RTD, thermocouple, and bridge sensor front ends in industrial temperature measurement systems.
For engineers reviewing the ADS1146IPWR datasheet, ADS1146IPWR pinout, ADS1146IPWR application, or ADS1146IPWR equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options, and supply-ready procurement guidance - all grounded in TI's SBAS453G production datasheet.
Technical Context
The ADS1146IPWR implements a third-order delta-sigma modulator with a single-cycle settling sinc³ digital filter, enabling fast channel cycling without settling delay. Its PGA offers eight selectable gains (1–128 V/V), and the analog input path includes burnout current sources (0.5/2/10 µA) and bias voltage generation for thermocouple cold-junction compensation.
It operates with unipolar (2.7–5.25 V) or bipolar (±2.5 V) analog supplies and uses an SPI-compatible serial interface with active-low CS, START, RESET, and DRDY signals. Unlike ADS1147/ADS1148, it lacks internal voltage reference, dual IDACs, GPIOs, and multiplexer inputs - confirming its role as a minimal-footprint, single-channel precision ADC for cost-sensitive sensor nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit, no missing codes - guarantees monotonicity and full-scale linearity for precision sensor digitization. |
| Data Rate | 5–2000 SPS - supports both low-noise slow-sampling (e.g., 20 SPS for simultaneous 50/60-Hz rejection) and faster control-loop sampling. |
| PGA Gain Range | 1× to 128× - enables direct interface to mV-level thermocouple outputs or high-impedance RTD bridges without external amplification. |
| INL Error | ±1 LSB (end-point fit) - ensures <0.0015% full-scale accuracy critical for Class A RTD compliance. |
| Offset Drift | 100 nV/°C (Gain = 1) - minimizes thermal-induced zero-error drift in wide-temperature industrial environments (–40°C to +105°C). |
| Power Supply Rejection | 100 dB (AVDD/DVDD at DC) - maintains accuracy despite ripple or noise on shared PCB power rails. |
| Input Bias Current | 100 pA - preserves signal integrity when measuring high-impedance sensors like thermistors or unbuffered RTDs. |
Pinout & Package
TSSOP-16 package (5.00 mm × 4.40 mm), thermally enhanced with exposed pad connected to AVSS; suitable for compact industrial PCB layouts requiring minimal board area and reliable thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AINP / AINN | Differential analog input pair | Primary signal path for precision measurement; supports burnout detection and VBIAS injection for thermocouples. |
| REFP / REFN | Differential external reference inputs | Accepts stable external reference (e.g., REF5025) - required since ADS1146 lacks internal VREF. |
| AVDD / AVSS | Analog power supply rails | Supports unipolar (2.7–5.25 V) or bipolar (±2.5 V) operation; AVSS serves as analog ground reference. |
| DVDD / DGND | Digital power supply rails | Independent 2.7–5.25 V digital domain; decoupling to DGND prevents digital noise coupling into analog section. |
| SCLK / DIN / DOUT/DRDY / CS / START / RESET | SPI-compatible digital interface | Full hardware-controlled conversion sequencing - START initiates conversion, DRDY signals completion, CS enables frame sync. |
| CLK | External clock input | Tie to DGND to enable internal 4.096 MHz oscillator - eliminates need for external crystal in space-constrained designs. |
Key Features
| Feature | Design Value |
|---|---|
| Single-cycle settling digital filter | Enables immediate readout after START pulse - eliminates wait time between channel scans in multi-sensor systems using external mux. |
| Programmable burnout current sources | 0.5/2/10 µA settings detect open-circuit RTDs or broken thermocouple wires before conversion begins - improves system reliability. |
| Adjustable PGA gain (1–128×) | Configurable per measurement cycle via register write - allows dynamic range optimization across varying sensor output levels. |
| Internal oscillator (4.096 MHz) | Provides precise, temperature-stable clock without external components - reduces BOM count and layout complexity. |
| Simultaneous 50/60-Hz rejection | At 20 SPS, filter nulls both line frequencies - eliminates need for external notch filters in AC-powered factory environments. |
Applications
| RTD Temperature Sensing | Thermocouple Measurement |
|---|---|
|
Use Scenario: Precision 2-/3-/4-wire RTD measurement in PLC analog input modules. IC Role / Device Role / Timing Role: Primary ADC front end with PGA gain scaling, burnout detection, and external reference buffering. Use Value: ±1 LSB INL and 100 nV/°C offset drift ensure Class A RTD accuracy over –40°C to +85°C operating range. |
Use Scenario: Isolated K-type thermocouple interface in industrial oven controllers. IC Role / Device Role / Timing Role: Cold-junction compensated digitizer using internal VBIAS and external reference. Use Value: Burnout detection identifies wire breaks before process fault escalation; 20 SPS mode rejects furnace AC interference. |
| Resistive Bridge Sensors | Low-Power Sensor Nodes |
|
Use Scenario: Strain gauge readout in structural health monitoring wireless nodes. IC Role / Device Role / Timing Role: Low-drift, low-noise ADC capturing microvolt-level bridge imbalances. Use Value: 100 pA input bias current prevents loading of high-Z Wheatstone bridges; 16-bit resolution resolves <1 ppm strain changes. |
Use Scenario: Battery-powered environmental sensor with wake-on-event capability. IC Role / Device Role / Timing Role: Ultra-low-power ADC in sleep mode (0.1 µA IAVDD) activated by START pulse. Use Value: Power-down current <0.2 µA extends 10-year battery life; internal oscillator avoids external timing component leakage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1147IPWR | Includes internal 2.048-V reference, 4-input mux, dual IDACs, and 4 GPIOs; TSSOP-20 package. | Supports multi-sensor scanning (e.g., 4 RTDs) and self-contained excitation - eliminates external reference and current sources. | Select ADS1147IPWR when expanding to multi-channel sensor arrays or requiring integrated excitation and reference. |
| ADS1246IPW | 24-bit resolution, same TSSOP-16 package, but higher power (350 µA typical) and no internal oscillator. | Delivers 10× better resolution for ultra-high-precision metrology; requires external clock and reference. | Choose ADS1246IPW only when 16-bit resolution is insufficient and system can accommodate higher power and external timing. |
Compared with ADS1147IPWR, ADS1146IPWR trades multiplexing, IDACs, and internal reference for lower cost, smaller footprint, and simpler layout - while retaining identical PGA, filter, and timing architecture. Against ADS1246IPW, it sacrifices resolution for lower power and integrated clock, making it optimal for cost- and size-constrained industrial sensing where 16-bit fidelity suffices.
Availability
ADS1146IPWR is available at Aetrix Electronics and suitable for RTD temperature sensing, thermocouple measurement, resistive bridge readout, low-power sensor nodes, and industrial process monitoring requiring stable component supply across extended product lifecycles.
Supply support for ADS1146IPWR 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 focused on analog and embedded processing technologies, with decades of expertise in precision data acquisition and industrial signal chain solutions.
The ADS114x family was engineered specifically for high-accuracy sensor measurement front ends - emphasizing low drift, integrated diagnostics (burnout detection), and simplified system design in factory automation, process control, and test equipment.
FAQ
Does ADS1146IPWR include an internal voltage reference?
No, ADS1146IPWR requires an external differential reference applied to REFP/REFN pins. Unlike ADS1147/ADS1148, it omits the internal 2.048-V reference to reduce die size and cost. This makes ADS1146IPWR ideal for systems already using a high-precision external reference such as REF5025 or ADR4525, ensuring optimal overall system accuracy and thermal stability.
What is the maximum data rate supported by ADS1146IPWR?
The ADS1146IPWR supports data rates from 5 SPS up to 2000 SPS. At 2000 SPS, the device achieves single-cycle settling - meaning each conversion completes within one digital filter period. This enables rapid sampling for closed-loop control, while lower rates (e.g., 20 SPS) provide simultaneous 50-Hz and 60-Hz line-frequency rejection essential for noisy industrial environments.
Can ADS1146IPWR perform sensor burnout detection?
Yes, ADS1146IPWR integrates programmable burnout current sources (0.5 µA, 2 µA, or 10 µA) that inject current into AINP/AINN to detect open-circuit conditions in RTDs or thermocouples. When enabled, the ADC measures resulting voltage deviation - flagging sensor failure before conversion proceeds. This feature is confirmed in the SBAS453G datasheet Section 9.3 and is fully functional on ADS1146IPWR.
Is ADS1146IPWR pin-compatible with ADS1147IPWR or ADS1148IPWR?
No, ADS1146IPWR is not pin-compatible with ADS1147IPWR or ADS1148IPWR. ADS1146IPWR uses a 16-pin TSSOP package with dedicated AINP/AINN inputs and no GPIOs, while ADS1147IPWR (20-pin) and ADS1148IPWR (28-pin) add multiplexer inputs, IDACs, GPIOs, and reference outputs. Pin mapping differs significantly - PCB redesign is required for substitution.
What power supply configurations does ADS1146IPWR support?
ADS1146IPWR supports both unipolar (AVDD = 2.7–5.25 V, AVSS = 0 V) and bipolar (AVDD = +2.5 V, AVSS = –2.5 V) analog supplies. Digital supply DVDD operates independently from 2.7 V to 5.25 V. The device's separate AVSS and DGND pins allow star-grounding best practices, and its 100 dB PSRR ensures immunity to supply rail noise - critical for mixed-signal industrial PCBs.
ADS1146IPWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 2k
- Number of Inputs:
- 1
- Input Type:
- Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-PGA-ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.7V ~ 5.25V
- Voltage - Supply, Digital:
- 2.7V ~ 5.25V
- Features:
- PGA
- Operating Temperature:
- -40°C ~ 105°C
- Supplier Device Package:
- 16-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS1146IPWR FAQ
1.How can I place an order for ADS1146IPWR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS1146IPWR 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 ADS1146IPWR reliable?
The price and inventory of ADS1146IPWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS1146IPWR is usually 5 days.
3.What payment methods are accepted for ADS1146IPWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS1146IPWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS1146IPWR?
ADS1146IPWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS1146IPWR 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 ADS1146IPWR?
For technical support, including ADS1146IPWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS1146IPWR requirements.
6.How does Aetrix verify that ADS1146IPWR is sourced from the original manufacturer or authorized distributors?
All ADS1146IPWR 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 ADS1146IPWR meets industry standards.
7.What is the process for return or replacement of ADS1146IPWR?
All ADS1146IPWR units undergo pre-shipment inspection (PSI). If there is an issue with ADS1146IPWR, 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 ADS1146IPWR part is unused and in its original packaging.
Return procedure for ADS1146IPWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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