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Texas Instruments ADS131M08QPBSRQ1
- Part No.:
- ADS131M08QPBSRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 32-TQFP
- Datasheet:
-
ADS131M08QPBSRQ1.pdf
- Description:
- AUTOMOTIVE, EIGHT-CHANNEL, 24-BI
- Quantity:
- Payment:
- Shipping:
Inventory:957
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Product details
Overview
ADS131M08QPBSRQ1 from Texas Instruments is an AEC-Q100 Grade 1 (–40°C to +125°C) automotive-grade, 8-channel, simultaneous-sampling, 24-bit delta-sigma ADC with programmable gain up to 128, 102-dB dynamic range at 4 kSPS/gain=1, and integrated 1.2-V low-drift reference - designed for high-accuracy current, voltage, and temperature sensing in battery management systems.
For engineers reviewing the ADS131M08QPBSRQ1 datasheet, ADS131M08QPBSRQ1 pinout, ADS131M08QPBSRQ1 application, or ADS131M08QPBSRQ1 equivalent, this page delivers verified technical context, validated pin functions, real-world BMS use cases, and two confirmed alternative parts with documented functional and application-level differences.
Technical Context
The ADS131M08QPBSRQ1 implements eight independent ΔΣ modulators with synchronized sampling, each feeding a configurable digital decimation filter supporting data rates from 62.5 SPS to 32 kSPS. Its PGA architecture enables direct shunt-current measurement via 330-kΩ input impedance at gains 1–4 and ≥1-MΩ at gains 8–128.
It integrates channel-to-channel phase delay calibration (244-ns resolution), cyclic redundancy check (CRC) on SPI communications and register map, and a negative charge pump enabling inputs down to AGND – 1.3 V - all operating from dual 2.7–3.6-V analog/digital supplies with total power as low as 6.0 mW at 3 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit delta-sigma - delivers 113 dB dynamic range (20.3 ENOB) at 0.25 kSPS/gain=1 for ultra-low-noise precision measurements. |
| Data Rate | Up to 32 kSPS per channel in high-resolution mode - supports real-time cell voltage monitoring in fast-switching BMS topologies. |
| Input Impedance | ≥1 MΩ at gains 8–128 - enables direct connection to thermistors and analog-output temperature sensors without external buffers. |
| Crosstalk | –120 dB - ensures isolation between adjacent channels during simultaneous sampling of high-voltage battery strings. |
| Power Consumption | 6.0 mW at 3-V AVDD/DVDD - reduces thermal load and simplifies thermal design in densely packed automotive modules. |
| Reference | Integrated 1.2-V low-drift reference (8 ppm/°C) - eliminates external reference component and PCB area while maintaining accuracy over –40°C to +125°C. |
| ESD Rating | HBM ±2000 V, CDM ±750 V (corner pins) - meets AEC-Q100-002/011 requirements for robustness in automotive assembly and field operation. |
Pinout & Package
ADS131M08QPBSRQ1 is housed in a 32-pin TQFP package (5.00 mm × 5.00 mm body size) with exposed thermal pad, rated for –40°C to +125°C ambient operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN0P–AIN7P / AIN0N–AIN7N | Differential analog inputs (8 channels) | Support simultaneous sampling of bidirectional shunt currents, resistor-divider voltages, or thermistor bridges without inter-channel skew. |
| AVDD, AGND, DVDD, DGND | Analog/digital supply and ground rails | Separate analog/digital domains minimize noise coupling; AVDD/DVDD accept 2.7–3.6 V, enabling single-supply system integration. |
| SCLK, DIN, DOUT, CS | SPI serial interface | CPOL = 0, CPHA = 1 timing; supports daisy-chain configuration for multi-ADC stacks in large battery packs. |
| DRDY | Asynchronous data-ready indicator | Active-low pulse signals valid conversion data ready for readout - enables deterministic firmware timing without polling. |
| SYNC/RESET | Global synchronization or hard reset | Enables precise time-aligned sampling across multiple ADS131M08QPBSRQ1 devices in distributed BMS architectures. |
| XTAL1/CLKIN, XTAL2 | External clock input/output | Accepts 2.048–8.192 MHz crystal or CMOS clock; supports phase-coherent multi-device synchronization via shared CLKIN. |
| REFIN | External reference input | Accepts 1.1–1.3 V external reference; bypassed when using internal 1.2-V reference - simplifies layout if high-precision external ref not required. |
| CAP | Negative charge pump output | Provides –1.8 V rail enabling differential input signals extending 1.3 V below AGND - critical for ground-referenced shunt measurements. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous sampling across 8 channels | Eliminates inter-channel timing skew (<10 ns typical), enabling accurate SOC/SOH calculation from time-aligned voltage/current snapshots. |
| Programmable channel-to-channel phase delay calibration | 244-ns resolution adjustment compensates for PCB trace length mismatches - maintains sub-degree phase accuracy in e-metering applications. |
| Cyclic redundancy check (CRC) | Applied to SPI data transfers and register writes - prevents undetected corruption of gain, offset, or filter configuration in safety-critical BMS firmware. |
| Fast startup (≤0.5 ms) | First valid sample delivered within 0.5 ms of supply ramp - supports rapid wake-from-standby diagnostics and fault recovery in ISO 26262 ASIL-B/C systems. |
| Integrated negative charge pump | Generates internal negative rail allowing input common-mode range down to AGND – 1.3 V - enables true bipolar measurement with single 3.3-V supply. |
| Three scalable power modes | High-resolution (6.0 mW), low-power (3.4 mW), and very-low-power (1.9 mW) modes let designers optimize dynamic range vs. thermal/power budget per application phase. |
Applications
| Automotive Battery Management System (BMS) | EV DC Charging Station E-Metering |
|---|---|
|
Use Scenario: Real-time monitoring of 12S–100S lithium-ion battery packs with simultaneous cell voltage, shunt current, and thermistor temperature acquisition. IC Role / Device Role / Timing Role: Primary analog front-end ADC performing synchronized 24-bit sampling across all channels at 4–16 kSPS to feed SOC/SOH algorithms. Use Value: 102-dB dynamic range and <±240 µV offset error ensure <0.1% full-scale accuracy for voltage balancing decisions under thermal stress. |
Use Scenario: High-accuracy energy metering in liquid-cooled DC fast chargers measuring grid-side AC input and vehicle-side DC output simultaneously. IC Role / Device Role / Timing Role: Dual-ADC subsystem (two ADS131M08QPBSRQ1 in sync mode) capturing phase-aligned voltage/current waveforms for Class 0.2 metering compliance. Use Value: –120 dB crosstalk and –100 dB THD enable precise harmonic analysis up to 50th order for IEC 62053-22 compliance. |
| Energy Storage System (ESS) Rack Monitoring | Automotive Onboard Charger (OBC) Control |
|
Use Scenario: Centralized monitoring of 48V–800V stationary ESS racks with distributed voltage, current, and temperature sensing across 10+ modules. IC Role / Device Role / Timing Role: Modular ADC node providing isolated, time-stamped 24-bit data over SPI to master controller for state estimation and thermal runaway detection. Use Value: Integrated CRC and AEC-Q100 qualification ensure data integrity and long-term reliability in 15-year infrastructure deployments. |
Use Scenario: Closed-loop control of bi-directional OBC inverters requiring precise AC line voltage/current and DC bus voltage feedback during charging/discharging. IC Role / Device Role / Timing Role: High-speed analog acquisition engine delivering synchronized 32-kSPS samples to MCU for real-time PWM modulation and protection logic. Use Value: Fast 0.5-ms startup and programmable gain support rapid transition between standby, charging, and fault-handling states per ISO 15118. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 24-bit simultaneous-sampling ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS131M06QPBSRQ1 | 6-channel version, identical architecture, same 32-pin TQFP package, but lacks two analog input pairs and associated digital resources. | Targeted at cost-optimized 6S–48S BMS where channel count reduction is acceptable; lower power (5.1 mW) and smaller firmware footprint. | Select when full 8-channel capability is unnecessary and BOM cost reduction is prioritized over future scalability. |
| AD7606C-24BSTZ | SAR-based (not ΔΣ), 8-channel, 24-bit, ±10 V input range, no integrated PGA or charge pump; requires external reference and signal conditioning. | Better suited for industrial PLCs or test equipment needing wide input range and faster throughput (up to 1 MSPS), not automotive-grade simultaneous sampling. | Choose only if system already uses ±15 V supplies and requires microsecond-level latency - not drop-in compatible for automotive BMS. |
Compared with ADS131M06QPBSRQ1, the ADS131M08QPBSRQ1 provides two additional fully featured channels and higher dynamic range at low frequencies; versus AD7606C-24BSTZ, it offers integrated signal conditioning, automotive qualification, and superior low-frequency noise performance - making it uniquely fit for ASIL-B compliant battery monitoring.
Availability
ADS131M08QPBSRQ1 is available at Aetrix Electronics and suitable for automotive battery management systems, EV charging station metering, and energy storage system monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADS131M08QPBSRQ1 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 solutions and functional safety certification.
The ADS131M08QPBSRQ1 belongs to TI's high-precision, automotive-qualified delta-sigma ADC portfolio - engineered specifically for simultaneous-sampling, low-power, high-dynamic-range sensing in battery electric vehicles and grid-edge energy systems.
FAQ
What is the maximum data rate supported by the ADS131M08QPBSRQ1?
The ADS131M08QPBSRQ1 supports up to 32 kSPS per channel in high-resolution mode with fCLKIN = 8.192 MHz. At this rate, dynamic range drops to 99 dB (gain = 1), but it remains fully functional for fast transient detection in BMS overvoltage/overcurrent events. Lower data rates improve noise performance - e.g., 4 kSPS yields 102-dB dynamic range.
Does the ADS131M08QPBSRQ1 require an external crystal oscillator?
No - the ADS131M08QPBSRQ1 accepts either a 2.048–8.192 MHz external crystal (via XTAL1/CLKIN and XTAL2) or a CMOS clock source. It does not include an internal oscillator; clock source selection is configured via registers. Crystal operation supports precise multi-device synchronization essential for e-metering applications.
How does the integrated negative charge pump in the ADS131M08QPBSRQ1 benefit BMS designs?
The integrated negative charge pump in the ADS131M08QPBSRQ1 generates a –1.8 V rail, enabling analog inputs to swing 1.3 V below AGND. This allows direct measurement of bidirectional shunt currents with a single 3.3-V supply - eliminating level-shifting circuitry, reducing BOM count, and improving measurement accuracy in ground-referenced configurations.
Is the ADS131M08QPBSRQ1 pin-compatible with other devices in the ADS131Mxx-Q1 family?
Yes - the ADS131M08QPBSRQ1 shares the same 32-pin TQFP (PBS) package and pinout with ADS131M04QPBSRQ1 and ADS131M06QPBSRQ1. Channel-specific pins (AINxP/AINxN) are allocated identically; unused pins on lower-channel variants are NC or reserved. This enables hardware reuse across BMS platforms with varying channel requirements.
What functional safety documentation is available for the ADS131M08QPBSRQ1?
Texas Instruments provides a Functional Safety Manual (FSM) and Failure Modes Effects and Diagnostic Analysis (FMEDA) report for the ADS131M08QPBSRQ1, covering FIT rate, diagnostic coverage, and safety mechanisms like CRC, startup self-test, and watchdog timer support. These documents aid ISO 26262 ASIL-B system-level certification when used per TI's safety manual guidelines.
ADS131M08QPBSRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 32-TQFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 24
- Sampling Rate (Per Second):
- 32k
- Number of Inputs:
- 8
- Input Type:
- Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- ADC
- Ratio - S/H:ADC:
- 0:1
- Number of A/D Converters:
- 8
- Architecture:
- Sigma-Delta
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 2.4V ~ 3.6V, 2.7V ~ 3.6V
- Voltage - Supply, Digital:
- 1.65V ~ 2V, 2.7V ~ 3.6V
- Features:
- Internal Oscillator, PGA, Simultaneous Sampling, Temperature Sensor
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Supplier Device Package:
- 32-TQFP (5x5)
- Mounting Type:
- Surface Mount
- Grade:
- Automotive
- Qualification:
- AEC-Q100
ADS131M08QPBSRQ1 FAQ
1.How can I place an order for ADS131M08QPBSRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS131M08QPBSRQ1 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 ADS131M08QPBSRQ1 reliable?
The price and inventory of ADS131M08QPBSRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS131M08QPBSRQ1 is usually 5 days.
3.What payment methods are accepted for ADS131M08QPBSRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS131M08QPBSRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS131M08QPBSRQ1?
ADS131M08QPBSRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS131M08QPBSRQ1 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 ADS131M08QPBSRQ1?
For technical support, including ADS131M08QPBSRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS131M08QPBSRQ1 requirements.
6.How does Aetrix verify that ADS131M08QPBSRQ1 is sourced from the original manufacturer or authorized distributors?
All ADS131M08QPBSRQ1 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 ADS131M08QPBSRQ1 meets industry standards.
7.What is the process for return or replacement of ADS131M08QPBSRQ1?
All ADS131M08QPBSRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with ADS131M08QPBSRQ1, 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 ADS131M08QPBSRQ1 part is unused and in its original packaging.
Return procedure for ADS131M08QPBSRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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