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Texas Instruments ADS1118QDGSRQ1
- Part No.:
- ADS1118QDGSRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADS1118QDGSRQ1.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 10VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:6,855
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Product details
Overview
ADS1118QDGSRQ1 from Texas Instruments is an AEC-Q100 Grade 1 (–40°C to +125°C) automotive-qualified, 16-bit delta-sigma analog-to-digital converter with integrated PGA, internal voltage reference, oscillator, and high-accuracy temperature sensor. It supports four single-ended or two differential inputs, programmable data rates from 8 SPS to 860 SPS, and operates from 2 V to 5.5 V supply - enabling precision thermocouple and RTD measurements in battery management systems.
For engineers reviewing the ADS1118QDGSRQ1 datasheet, ADS1118QDGSRQ1 pinout, ADS1118QDGSRQ1 application, or ADS1118QDGSRQ1 equivalent, key selection considerations include its SPI interface, on-chip cold-junction compensation capability, ±2°C max temperature sensor error, single-shot power-down mode (150 µA active, 0.5–2 µA standby), and VSSOP-10 package compatibility with space-constrained automotive sensor nodes.
Technical Context
The ADS1118QDGSRQ1 implements a delta-sigma (ΔΣ) ADC core with digital filtering, oversampling ratio (OSR) scaling, and single-cycle settling. Its internal PGA provides programmable gain (±0.256 V to ±6.144 V FSR), while the integrated oscillator eliminates external clock components.
It operates in two functional modes: continuous-conversion (fixed data rate up to 860 SPS) and single-shot (auto power-down after conversion). The device uses a 16-bit serial peripheral interface (SPI) with CS, SCLK, DIN, and DOUT/DRDY signals, supporting daisy-chain configurations and DRDY-driven interrupt timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit no-missing-codes - ensures full dynamic range utilization for high-fidelity sensor digitization without code gaps. |
| Data Rate | 8–860 SPS programmable - balances noise performance (lower rate = lower RMS noise) and real-time responsiveness in closed-loop systems. |
| Input Configuration | 4 single-ended or 2 differential channels via internal mux - enables flexible signal routing without external switching components. |
| PGA Full-Scale Range | ±0.256 V to ±6.144 V - accommodates both microvolt-level thermocouple outputs and volt-level industrial sensors. |
| Temperature Sensor Accuracy | ±2°C over –40°C to +125°C - provides reliable cold-junction compensation for K-type thermocouples without external sensing. |
| Supply Current | 150 µA (continuous), 0.5–2 µA (power-down) - extends battery life in always-on automotive monitoring applications. |
| Operating Voltage | 2 V to 5.5 V - interfaces directly with 3.3 V and 5 V microcontrollers and survives automotive load-dump transients. |
Pinout & Package
VSSOP-10 package (3.00 mm × 3.00 mm), thin profile, leaded surface-mount - compatible with standard reflow processes and high-density PCB layouts in automotive ECUs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCLK | Digital input | Serial clock input for SPI communication; low pulse >30.8 ms resets interface state machine. |
| CS | Digital input | Active-low chip select; can be permanently tied to GND if SPI bus is dedicated to this device. |
| GND | Supply return | Analog and digital ground reference; requires low-inductance connection to minimize noise coupling into ADC core. |
| AIN0–AIN3 | Analog inputs | Multiplexed inputs supporting single-ended (vs GND) or differential (e.g., AIN0–AIN1) measurement; internal switch connects negative input to GND in SE mode. |
| VDD | Power supply | 2–5.5 V main supply; requires 0.1 µF decoupling capacitor placed adjacent to pin per layout guidelines. |
| DOUT/DRDY | Digital output | Combined data-ready flag and serial data output; active-low DRDY indicates conversion completion and enables interrupt-driven firmware polling. |
| DIN | Digital input | Serial data input for configuration register writes and command transmission; synchronized to SCLK falling edge. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated temperature sensor | ±2°C accuracy over full automotive range - enables self-contained cold-junction compensation for thermocouple interfaces without external ICs or calibration. |
| Internal voltage reference | Low-drift on-chip reference - eliminates need for external precision reference and reduces BOM count and layout area. |
| Programmable gain amplifier (PGA) | Gain settings from 2/3× to 16× - allows direct digitization of low-amplitude sensor outputs (e.g., 40 µV/°C thermocouples) without external op-amp stages. |
| Single-shot conversion mode | Auto power-down after conversion - reduces average current to sub-µA levels during idle periods in duty-cycled sensor systems. |
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C operation - meets automotive reliability requirements for under-hood and cabin-mounted sensor modules. |
Applications
| Battery Management System (BMS) | Automotive Thermocouple Interface |
|---|---|
Use Scenario: Monitoring cell voltage and pack temperature in 12 V and 48 V EV/HEV battery packs with limited PCB space and thermal constraints. IC Role / Device Role / Timing Role: Simultaneous high-resolution voltage sampling and on-die temperature acquisition for state-of-charge and thermal runaway prevention algorithms. Use Value: Eliminates separate temperature sensor and reference IC, reducing component count by ≥3 parts and improving cold-junction compensation accuracy vs discrete solutions. | Use Scenario: Digitizing K-type thermocouple outputs in exhaust gas temperature (EGT) or turbocharger housing sensors exposed to extreme thermal cycling. IC Role / Device Role / Timing Role: Delta-sigma ADC with integrated cold-junction compensation - measures thermocouple EMF while simultaneously reading local junction temperature. Use Value: Achieves ±2°C total system error without external RTD or thermistor, simplifying mechanical mounting and eliminating calibration drift from interconnect parasitics. |
| Resistance Temperature Detector (RTD) Readout | Automotive Pressure Sensor Signal Conditioning |
Use Scenario: High-precision readout of Pt100/Pt1000 RTDs in HVAC actuators and engine coolant temperature modules. IC Role / Device Role / Timing Role: Low-noise, programmable-gain front-end with 16-bit resolution and 860 SPS maximum rate - supports ratiometric or constant-current excitation schemes. Use Value: Delivers <10 ppm INL and 0.03125°C temperature resolution - meets ASAM MCD-2 MC Class B requirements for emission-critical temperature sensing. | Use Scenario: Signal conditioning for piezoresistive pressure sensors in brake master cylinders and fuel rail monitors. IC Role / Device Role / Timing Role: Differential ADC with 150 µA supply current and 2 V–5.5 V operation - interfaces directly with bridge outputs and withstands automotive supply fluctuations. Use Value: Enables true 16-bit pressure resolution at 128 SPS with <1 LSB offset drift over temperature - improves diagnostic coverage for ISO 26262 ASIL-B functional safety paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar analog-to-digital conversion applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1115QDGSRQ1 | I²C interface instead of SPI; no integrated temperature sensor; same 16-bit resolution and PGA. | Lacks on-die cold-junction compensation; requires external temperature sensing for thermocouple use. | Select when I²C bus availability and reduced pin count outweigh need for integrated temperature sensing. |
| ADS1018QDGSRQ1 | 12-bit resolution; higher 3300 SPS max data rate; identical package, PGA, and temperature sensor. | Lower resolution limits dynamic range for low-noise RTD or strain gauge applications requiring >14 ENOB. | Select when higher speed is critical and 12-bit precision suffices - e.g., fast-response pressure transients without post-processing averaging. |
Compared with ADS1115QDGSRQ1 and ADS1018QDGSRQ1, the ADS1118QDGSRQ1 uniquely combines SPI interface, 16-bit resolution, and integrated ±2°C temperature sensor - making it the only option among the three that delivers complete thermocouple signal chain integration in a single VSSOP-10 package.
Availability
ADS1118QDGSRQ1 is available at Aetrix Electronics and suitable for battery management systems, automotive thermocouple interfaces, and resistance temperature detector (RTD) readout applications requiring stable component supply across extended automotive product lifecycles.
Supply support for ADS1118QDGSRQ1 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 deep expertise in automotive-grade signal chain and power management solutions.
The ADS1118QDGSRQ1 belongs to TI's automotive-qualified precision ADC portfolio, designed specifically for high-reliability sensor signal acquisition in harsh environments - including engine control, thermal management, and electrified powertrain subsystems.
FAQ
What is the operating temperature range for the ADS1118QDGSRQ1?
The ADS1118QDGSRQ1 is qualified per AEC-Q100 Grade 1 with a specified operating ambient temperature range of –40°C to +125°C. This rating is validated across all electrical parameters in the datasheet, including INL, offset drift, and temperature sensor accuracy, ensuring robust performance in under-hood and cabin-mounted automotive applications where thermal stress is severe.
Does the ADS1118QDGSRQ1 require an external crystal or oscillator?
No, the ADS1118QDGSRQ1 integrates a precision internal oscillator, eliminating the need for external timing components. This reduces BOM cost and PCB footprint while maintaining stable conversion timing across temperature and supply voltage variations - a key advantage for automotive designs where component count and reliability are critical.
How does the ADS1118QDGSRQ1 support cold-junction compensation for thermocouples?
The ADS1118QDGSRQ1 includes a factory-calibrated, high-accuracy on-die temperature sensor with ±2°C error over –40°C to +125°C. When measuring a K-type thermocouple differentially (e.g., AIN0–AIN1), the device simultaneously acquires the thermocouple voltage and local junction temperature - enabling real-time cold-junction compensation in firmware without external sensors or lookup tables.
What is the maximum data rate and corresponding noise performance of the ADS1118QDGSRQ1?
The ADS1118QDGSRQ1 supports a maximum data rate of 860 SPS. At this rate with ±0.256 V FSR, input-referred RMS noise is 7.81 µVRMS (35.83 µVPP), yielding ~13.8 noise-free bits. Lowering the data rate to 8 SPS reduces RMS noise to 7.81 µVRMS across all FSRs and achieves full 16-bit noise-free resolution - ideal for high-precision static measurements.
Can the ADS1118QDGSRQ1 operate from a 2.0 V supply?
Yes, the ADS1118QDGSRQ1 is fully specified for operation from 2.0 V to 5.5 V. At 2.0 V supply, it maintains 16-bit resolution, 8–860 SPS programmability, and functional integrity of the PGA, temperature sensor, and SPI interface - enabling direct integration with low-voltage microcontrollers and energy-harvesting subsystems in automotive body electronics.
ADS1118QDGSRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 860
- Number of Inputs:
- 2, 4
- 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:
- Internal
- Voltage - Supply, Analog:
- 2V ~ 5.5V
- Voltage - Supply, Digital:
- 2V ~ 5.5V
- Features:
- PGA, Temperature Sensor
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 10-VSSOP
- Mounting Type:
- Surface Mount
- Grade:
- Automotive
- Qualification:
- AEC-Q100
ADS1118QDGSRQ1 FAQ
1.How can I place an order for ADS1118QDGSRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS1118QDGSRQ1 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 ADS1118QDGSRQ1 reliable?
The price and inventory of ADS1118QDGSRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS1118QDGSRQ1 is usually 5 days.
3.What payment methods are accepted for ADS1118QDGSRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS1118QDGSRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS1118QDGSRQ1?
ADS1118QDGSRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS1118QDGSRQ1 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 ADS1118QDGSRQ1?
For technical support, including ADS1118QDGSRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS1118QDGSRQ1 requirements.
6.How does Aetrix verify that ADS1118QDGSRQ1 is sourced from the original manufacturer or authorized distributors?
All ADS1118QDGSRQ1 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 ADS1118QDGSRQ1 meets industry standards.
7.What is the process for return or replacement of ADS1118QDGSRQ1?
All ADS1118QDGSRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with ADS1118QDGSRQ1, 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 ADS1118QDGSRQ1 part is unused and in its original packaging.
Return procedure for ADS1118QDGSRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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