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Texas Instruments ADS1115QNKSRQ1
- Part No.:
- ADS1115QNKSRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-QFN
- Datasheet:
-
ADS1115QNKSRQ1.pdf
- Description:
- AUTOMOTIVE 16-BIT, 860-SPS, 4-CH
- Quantity:
- Payment:
- Shipping:
Inventory:4,855
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Product details
Overview
ADS1115QNKSRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified, 16-bit delta-sigma ADC with integrated PGA, voltage reference, oscillator, and I²C interface. It supports up to 860 SPS, four single-ended or two differential inputs, and programmable gain (±0.256 V to ±6.144 V), enabling high-precision sensor monitoring in space-constrained automotive displays and camera modules.
For engineers reviewing the ADS1115QNKSRQ1 datasheet, ADS1115QNKSRQ1 pinout, ADS1115QNKSRQ1 application, or ADS1115QNKSRQ1 equivalent, key selection criteria include its automotive temperature range (–40°C to +125°C), low 150 µA operating current, single-cycle settling, and I²C address configurability via ADDR pin - all critical for battery-powered, safety-conscious vehicle subsystems.
Technical Context
The ADS1115QNKSRQ1 implements a delta-sigma modulation architecture with on-chip digital filtering, delivering 16-bit no-missing-codes resolution and single-cycle settling. Its internal low-drift voltage reference and oscillator eliminate external timing components, while the programmable gain amplifier supports input ranges from ±256 mV to ±6.144 V for direct connection to low-level sensors.
It features a 4-channel analog multiplexer (AIN0–AIN3), configurable for differential or single-ended acquisition, and integrates a digital comparator with ALERT/RDY output for autonomous over/under-voltage detection - all controlled via I²C with four selectable slave addresses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes - guarantees monotonicity and full-scale linearity for precision measurement systems. |
| Max Sample Rate | 860 SPS - enables real-time monitoring of fast-changing analog signals like throttle position or brake pressure. |
| Input Configuration | 4 single-ended or 2 differential inputs - supports flexible sensor interfacing without external MUX hardware. |
| PGA Gain Range | ±0.256 V to ±6.144 V full-scale - allows direct digitization of millivolt-level thermocouples or high-voltage battery sensing. |
| Supply Voltage | 2.0 V to 5.5 V - compatible with automotive 3.3 V and 5 V domains, including start-stop system brownout conditions. |
| Operating Current | 150 µA at 860 SPS - minimizes power draw in always-on vehicle subsystems such as instrument clusters. |
| Temp Range | –40°C to +125°C (Grade 1) - qualified for under-hood and dashboard-mounted applications per AEC-Q100. |
Pinout & Package
ADS1115QNKSRQ1 is available in the 10-pin UQFN package (NKS), measuring 1.60 mm × 2.00 mm, with wettable flanks for automated optical inspection. The package supports high-density automotive PCB layouts and thermal performance characterized at RθJA = 126.3°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ADDR | I²C address select | Configures one of four I²C slave addresses (0x48–0x4B); pulled high/low or left floating to set device identity on shared bus. |
| ALERT/RDY | Digital comparator output / conversion ready flag | Open-drain output indicating threshold violation or end-of-conversion; requires external pullup for I²C system integration. |
| GND | Analog ground reference | Primary return path for analog inputs and internal reference; must be connected to clean system ground plane. |
| AIN0–AIN3 | Configurable analog inputs | Support differential (AIN0–AIN1, AIN2–AIN3) or single-ended (vs GND) acquisition; internally routed to PGA and ADC core. |
| VDD | Power supply | Supplies analog and digital circuitry; requires 0.1 µF decoupling capacitor placed adjacent to pin per layout guidelines. |
| SCL | I²C clock input | Accepts standard/fast-mode I²C clocks (up to 400 kHz) and high-speed mode (up to 3.4 MHz); requires external pullup. |
| SDA | I²C bidirectional data line | Transfers configuration registers and conversion results; open-drain structure mandates external pullup resistor. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated PGA | Programmable gain (1× to 16×) enables direct interface to low-output sensors (e.g., RTDs, strain gauges) without external amplification. |
| Digital comparator | Configurable high/low thresholds with latching or transparent mode - eliminates host MCU polling for alarm events. |
| Internal voltage reference | Low-drift (5 ppm/°C typical) 2.048 V reference ensures stable full-scale accuracy across automotive temperature extremes. |
| Single-cycle settling | Guarantees valid conversion result after one data rate interval - simplifies timing control in deterministic real-time systems. |
| AEC-Q100 Grade 1 | Qualified for automotive use with validated reliability, ESD robustness (HBM ±2 kV, CDM ±750 V), and extended temperature operation. |
Applications
| Automotive Instrument Cluster | Camera Module Sensor Monitoring |
|---|---|
Use Scenario: Real-time acquisition of speedometer, fuel level, and coolant temperature signals in digital dashboards. IC Role / Device Role / Timing Role: Primary analog front-end ADC converting multiple sensor outputs into digital values for MCU processing. Use Value: 16-bit resolution and ±0.256 V PGA range enable accurate reading of low-level resistive sensor outputs without signal conditioning. | Use Scenario: Monitoring bias voltages and temperature feedback in automotive surround-view camera modules. IC Role / Device Role / Timing Role: Standalone sensor monitor with autonomous ALERT/RDY triggering on out-of-range conditions. Use Value: Integrated comparator and low 150 µA current allow always-on fault detection without burdening main SoC resources. |
| Center Information Display | General-Purpose Voltage Monitoring |
Use Scenario: Digitizing HVAC control panel potentiometers, touch slider voltages, and ambient light sensor outputs. IC Role / Device Role / Timing Role: Multi-channel analog input hub supporting mixed-signal UI feedback in infotainment head units. Use Value: Four single-ended inputs and I²C address flexibility simplify BOM and routing in multi-sensor display control boards. | Use Scenario: Battery voltage supervision, rail monitoring, and current-sense amplifier output digitization in body control modules. IC Role / Device Role / Timing Role: Precision voltage digitizer with programmable full-scale range adapting to diverse sensing topologies. Use Value: ±6.144 V FSR setting supports direct connection to 5 V rails; internal reference removes need for external precision reference IC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit automotive ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1114QDGSRQ1 | Single-input (1 SE / 1 DE), identical PGA, reference, and I²C interface; lacks AIN2/AIN3 and MUX capability. | Suitable only for single-sensor systems; cannot replace ADS1115QNKSRQ1 in multi-channel designs without hardware change. | Select when cost optimization is prioritized and channel count is strictly limited to one analog source. |
| ADS1118QDGSRQ1 | Same 16-bit resolution and 860 SPS, but uses SPI interface and includes integrated temperature sensor; no I²C support. | Requires SPI-capable MCU and different firmware stack; temperature sensor adds value in thermal-aware systems but increases complexity. | Choose for SPI-based architectures or when on-die temperature measurement is required alongside voltage sensing. |
Compared with ADS1114QDGSRQ1 and ADS1118QDGSRQ1, the ADS1115QNKSRQ1 uniquely combines I²C compatibility, four-input flexibility, and automotive qualification in a 2 mm × 1.6 mm UQFN package - making it optimal for compact, multi-sensor automotive displays where bus simplicity and layout density are critical.
Availability
ADS1115QNKSRQ1 is available at Aetrix Electronics and suitable for automotive instrument clusters, center information displays, and camera module sensor monitoring requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for ADS1115QNKSRQ1 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 company specializing in analog and embedded processing technologies, with leadership in automotive-grade precision analog solutions.
The ADS111x-Q1 product line delivers AEC-Q100-qualified, low-power, high-resolution ADCs designed specifically for automotive sensor signal acquisition in displays, ADAS subsystems, and body electronics.
FAQ
What is the operating temperature range of the ADS1115QNKSRQ1?
The ADS1115QNKSRQ1 is AEC-Q100 Grade 1 qualified with an operating ambient temperature range of –40°C to +125°C. This specification is validated across process corners and lifetime stress tests, ensuring reliable operation in under-hood and dashboard-mounted automotive environments where thermal cycling and long-term stability are critical. The ADS1115QNKSRQ1 maintains specified INL, offset drift, and gain error performance across this full range.
Does the ADS1115QNKSRQ1 require an external crystal or clock source?
No, the ADS1115QNKSRQ1 does not require an external crystal or clock source. It integrates a precision internal oscillator that drives the delta-sigma modulator and digital filter, eliminating external timing components and reducing BOM count. This oscillator is factory-trimmed and supports all programmable data rates (8–860 SPS) without external dependency - a key enabler for compact automotive sensor nodes.
How many I²C addresses does the ADS1115QNKSRQ1 support?
The ADS1115QNKSRQ1 supports four I²C slave addresses: 0x48, 0x49, 0x4A, and 0x4B. Address selection is controlled by the logic state of the ADDR pin (connected to GND, VDD, SDA, or SCL). This allows up to four ADS1115QNKSRQ1 devices on the same I²C bus without address conflict - essential for multi-sensor automotive modules like cluster displays with independent gauge and warning circuits.
What is the function of the ALERT/RDY pin on the ADS1115QNKSRQ1?
The ALERT/RDY pin on the ADS1115QNKSRQ1 serves dual functions: it asserts as an open-drain comparator output when programmed thresholds are exceeded (ALERT mode), or toggles to indicate conversion completion (RDY mode). In either mode, it eliminates continuous I²C polling, reducing MCU overhead. The pin requires an external pullup resistor to VDD and is fully configurable via the Config register - a critical feature for low-power automotive wake-up and fault-reporting systems.
Can the ADS1115QNKSRQ1 measure both differential and single-ended signals?
Yes, the ADS1115QNKSRQ1 supports both configurations via its internal multiplexer. It can measure two differential pairs (AIN0–AIN1 and AIN2–AIN3) or four single-ended inputs (AIN0–AIN3 referenced to GND), selected through the Config register's MUX bits. This flexibility enables direct connection to diverse sensors - e.g., differential thermocouples and single-ended potentiometers - within the same automotive subsystem without external signal conditioning hardware.
ADS1115QNKSRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-QFN
- 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:
- I2C
- 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, Selectable Address
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Supplier Device Package:
- 10-UQFN (1.6x2)
- Mounting Type:
- Surface Mount
- Grade:
- Automotive
- Qualification:
- AEC-Q100
ADS1115QNKSRQ1 FAQ
1.How can I place an order for ADS1115QNKSRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS1115QNKSRQ1 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 ADS1115QNKSRQ1 reliable?
The price and inventory of ADS1115QNKSRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS1115QNKSRQ1 is usually 5 days.
3.What payment methods are accepted for ADS1115QNKSRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS1115QNKSRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS1115QNKSRQ1?
ADS1115QNKSRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS1115QNKSRQ1 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 ADS1115QNKSRQ1?
For technical support, including ADS1115QNKSRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS1115QNKSRQ1 requirements.
6.How does Aetrix verify that ADS1115QNKSRQ1 is sourced from the original manufacturer or authorized distributors?
All ADS1115QNKSRQ1 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 ADS1115QNKSRQ1 meets industry standards.
7.What is the process for return or replacement of ADS1115QNKSRQ1?
All ADS1115QNKSRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with ADS1115QNKSRQ1, 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 ADS1115QNKSRQ1 part is unused and in its original packaging.
Return procedure for ADS1115QNKSRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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