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Texas Instruments ADS112U04IPWR
- Part No.:
- ADS112U04IPWR
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADS112U04IPWR.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,753
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Product details
Overview
ADS112U04IPWR from Texas Instruments is a 16-bit, delta-sigma analog-to-digital converter with integrated UART interface, programmable gain amplifier (PGA), dual matched current sources (10 µA to 1.5 mA), internal 2.048-V reference (5 ppm/°C drift), and precision temperature sensor (±0.5°C accuracy). It supports two differential or four single-ended inputs and operates at up to 2 kSPS for thermocouple, RTD, and bridge sensor signal conditioning in industrial temperature transmitters.
For engineers reviewing the ADS112U04IPWR datasheet, ADS112U04IPWR pinout, ADS112U04IPWR application, or ADS112U04IPWR equivalent, this page delivers verified technical context, real-world use cases, pin-level design meaning, and validated alternative options - all grounded in TI's SBAS838A production data sheet.
Technical Context
The ADS112U04IPWR integrates a low-noise PGA (gain 1–128), simultaneous 50/60-Hz rejection digital filter (single-cycle settling at 20 SPS), and UART-compatible 2-wire interface (up to 120 kBaud with auto-baud detection). Its dual excitation current sources enable ratiometric measurements of resistive sensors, while the internal oscillator eliminates external timing components.
It features three GPIOs (GPIO0–GPIO2/DRDY), cold-junction compensation support for thermocouples, and operates across –40°C to +125°C. The device uses separate analog (AVDD/AVSS) and digital (DVDD/DGND) supplies, with independent power domains enabling galvanic isolation in noisy industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes; ensures full-scale monotonicity for precision sensor digitization. |
| Data Rate | Up to 2 kSPS in turbo mode; enables high-speed thermal monitoring without aliasing in closed-loop controllers. |
| Input Configuration | Two differential or four single-ended inputs via flexible MUX; simplifies PCB routing for multi-sensor systems. |
| PGA Gain Range | 1 to 128; allows direct interface to microvolt-level thermocouple outputs without external amplification. |
| Reference Voltage | Internal 2.048 V ±0.25% (WQFN), 5 ppm/°C drift; eliminates external reference IC and reduces BOM count. |
| UART Interface | 8-N-1 format, 2–120 kBaud with auto-baud detection; enables plug-and-play integration with isolated microcontrollers. |
| Supply Range | AVDD/AVSS: 2.3 V to 5.5 V; supports wide-input industrial power rails and battery-backed operation. |
Pinout & Package
ADS112U04IPWR is packaged in a 3.0-mm × 3.0-mm, 16-pin WQFN (RTE) with exposed thermal pad connected to AVSS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN0–AIN3 | Analog input channels | Support four single-ended or two differential sensor inputs; AIN0/AIN1 default for thermocouple measurement. |
| REFP / REFN | Differential reference inputs | Accept internal 2.048-V reference or external reference; REFP must be ≥ REFN + 0.75 V. |
| AVDD / AVSS | Analog supply rails | Isolated analog domain; AVSS serves as analog ground and thermal pad connection point. |
| DVDD / DGND | Digital supply rails | Independent digital domain; enables clean UART signaling and GPIO control without analog noise coupling. |
| TX / RX | UART serial interface | 2-wire asynchronous interface; TX is push-pull output, RX is Schmitt-trigger input with 0.3–0.7 DVDD thresholds. |
| GPIO0–GPIO2/DRDY | Configurable I/O | GPIO2 doubles as DRDY (active-low data-ready flag); supports interrupt-driven host polling or autonomous data capture. |
| RESET | Asynchronous reset input | Active-low pin requiring ≥250 ns pulse width; initiates power-on reset sequence and clears internal registers. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous 50/60-Hz rejection | Eliminates mains interference in factory-floor PLC modules without external notch filters or firmware averaging. |
| Internal temperature sensor | 14-bit resolution (0.03125°C step), ±0.5°C accuracy over –40°C to +125°C; enables on-chip cold-junction compensation for K-type thermocouples. |
| Dual matched IDACs | 10 µA to 1.5 mA with 0.3% matching and <40 ppm/°C drift; supports 2-/3-/4-wire RTD measurements with ratiometric accuracy. |
| Low power consumption | 315 µA typical active current at 20 SPS; extends battery life in portable environmental monitors and wireless sensor nodes. |
| Integrated oscillator | 1.024 MHz (normal) or 2.048 MHz (turbo) with ±2% accuracy; removes need for external crystal or clock generator. |
Applications
| Industrial Temperature Transmitter | PLC Analog Input Module |
|---|---|
Use Scenario: Digitizing K-type thermocouple outputs in hazardous-area field instruments with intrinsic safety barriers. IC Role / Device Role / Timing Role: Primary ADC with integrated CJC, PGA, and UART; replaces discrete op-amp + reference + isolator + MCU ADC chain. Use Value: Reduces component count by ≥7 parts; enables single-chip cold-junction compensation and 20-SPS 50/60-Hz rejection without firmware overhead. | Use Scenario: High-density analog input slots in modular PLC backplanes requiring galvanic isolation per channel. IC Role / Device Role / Timing Role: Isolated-channel ADC with UART output; interfaces directly to isolated UART transceivers (e.g., ISO1540). Use Value: Minimizes isolation channel count (2 wires vs. 4–8 for SPI), cutting isolation cost by ~40% and board area by 30%. |
| Climate Chamber Controller | Patient Temperature Monitor |
Use Scenario: Multi-zone temperature profiling in pharmaceutical stability chambers with ±0.1°C uniformity requirements. IC Role / Device Role / Timing Role: Precision ADC for Pt100 RTD readout using dual IDACs in 4-wire configuration. Use Value: Achieves <0.05% system gain error via matched IDACs and 5 ppm/°C reference drift, meeting IEC 60601-1 calibration traceability. | Use Scenario: Disposable skin-contact temperature probe with ultra-low power budget and medical-grade accuracy. IC Role / Device Role / Timing Role: Standalone ADC with internal temperature sensor and UART; powers from coin cell with 315 µA active current. Use Value: Enables 7-day continuous monitoring on CR2032; ±0.25°C typ sensor accuracy satisfies FDA Class II clinical thermometer requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1220IPWR | No UART interface; SPI-only; higher 24-bit resolution but no integrated oscillator or CJC sensor. | Requires external MCU for protocol translation and timing; better for high-resolution lab equipment than isolated field transmitters. | Select when SPI interface and >16-bit resolution are prioritized over UART simplicity and embedded CJC. |
| AD7124-4BRUZ | 4-channel, 24-bit sigma-delta ADC with SPI; includes burn-out currents and more flexible digital filters but no UART or internal CJC sensor. | Needs external temperature sensor for thermocouple CJC; suited for multi-parameter sensor hubs where SPI bandwidth justifies added complexity. | Choose for highest resolution and flexibility in non-isolated, MCU-rich systems where UART is not required. |
Compared with ADS1220IPWR and AD7124-4BRUZ, the ADS112U04IPWR uniquely combines UART interface, integrated CJC, and matched IDACs in a single 3×3 mm package-reducing bill-of-materials and layout complexity for isolated, thermocouple-focused industrial designs.
Availability
ADS112U04IPWR is available at Aetrix Electronics and suitable for industrial temperature transmitters, PLC analog input modules, and climate chamber controllers requiring stable component supply, long-term lifecycle support, and automotive-grade reliability screening.
Supply support for ADS112U04IPWR 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 signal chain solutions.
The ADS112U04IPWR belongs to TI's precision delta-sigma ADC family designed specifically for low-power, isolated sensor signal conditioning in harsh industrial environments-emphasizing integration, noise immunity, and ease of system-level isolation.
FAQ
What is the maximum achievable data rate for ADS112U04IPWR in turbo mode?
The ADS112U04IPWR achieves a maximum data rate of 2000 samples per second (2 kSPS) in turbo mode. This is confirmed in the "Features" section and Table 6-5 of the SBAS838A datasheet. At this rate, the device maintains 16-bit resolution with no missing codes, though noise performance and 50/60-Hz rejection are optimized at lower rates like 20 SPS.
Does ADS112U04IPWR support external voltage references?
Yes, ADS112U04IPWR supports external voltage references applied differentially between REFP and REFN pins. The reference input range is 0.75 V to 2.5 V (or AVDD – AVSS), and the device draws only ±10 nA from the reference source. Internal reference remains available and can be disabled via register configuration to prioritize external precision.
How does the ADS112U04IPWR implement cold-junction compensation for thermocouples?
The ADS112U04IPWR implements cold-junction compensation using its integrated 14-bit temperature sensor (±0.5°C accuracy over –40°C to +125°C) located adjacent to the analog input multiplexer. When configured for thermocouple measurement, the device automatically reads the junction temperature and applies correction in firmware or host processor-enabling accurate K-type thermocouple readings without external sensors.
What are the power supply requirements for ADS112U04IPWR's analog and digital domains?
ADS112U04IPWR requires separate analog (AVDD/AVSS) and digital (DVDD/DGND) supplies. AVDD to AVSS must be 2.3 V to 5.5 V; DVDD to DGND also 2.3 V to 5.5 V. AVSS and DGND may be tied together only if no galvanic isolation is used. Each supply requires a ≥100-nF decoupling capacitor placed close to the respective pins.
Can ADS112U04IPWR operate with a single 3.3-V supply across both domains?
Yes, ADS112U04IPWR can operate with AVDD = DVDD = 3.3 V and AVSS = DGND = 0 V, as validated in the "Recommended Operating Conditions" table (Section 6.3) and electrical characteristics (Section 6.5). This configuration is commonly used in non-isolated designs and simplifies power architecture while maintaining full 16-bit performance and UART functionality.
ADS112U04IPWR 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:
- 4
- Input Type:
- Differential, Pseudo-Differential, Single Ended
- Data Interface:
- UART
- Configuration:
- MUX-PGA-ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- ±2.5V, 2.3V ~ 5.5V
- Voltage - Supply, Digital:
- 2.3V ~ 5.5V
- Features:
- PGA, Temperature Sensor
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 16-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS112U04IPWR FAQ
1.How can I place an order for ADS112U04IPWR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS112U04IPWR 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 ADS112U04IPWR reliable?
The price and inventory of ADS112U04IPWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS112U04IPWR is usually 5 days.
3.What payment methods are accepted for ADS112U04IPWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS112U04IPWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS112U04IPWR?
ADS112U04IPWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS112U04IPWR 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 ADS112U04IPWR?
For technical support, including ADS112U04IPWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS112U04IPWR requirements.
6.How does Aetrix verify that ADS112U04IPWR is sourced from the original manufacturer or authorized distributors?
All ADS112U04IPWR 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 ADS112U04IPWR meets industry standards.
7.What is the process for return or replacement of ADS112U04IPWR?
All ADS112U04IPWR units undergo pre-shipment inspection (PSI). If there is an issue with ADS112U04IPWR, 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 ADS112U04IPWR part is unused and in its original packaging.
Return procedure for ADS112U04IPWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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