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Texas Instruments ADS7956QDBTRQ1
- Part No.:
- ADS7956QDBTRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 38-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADS7956QDBTRQ1.pdf
- Description:
- IC ADC 10BIT SAR 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,413
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Product details
Overview
ADS7956QDBTRQ1 from Texas Instruments is a 10-bit, 12-channel automotive-grade SAR ADC with 1-MSPS throughput, dual programmable alarm thresholds per channel, four configurable GPIOs, and serial SPI interface. It operates from 2.7 V to 5.25 V analog supply and supports unipolar input ranges of 0–2.5 V or 0–5 V - used in battery monitoring and power rail supervision in ADAS domain controllers.
For engineers reviewing the ADS7956QDBTRQ1 datasheet, ADS7956QDBTRQ1 pinout, ADS7956QDBTRQ1 application, or ADS7956QDBTRQ1 equivalent, key selection considerations include its AEC-Q100 Grade 1 qualification (–40°C to 125°C), 10-bit resolution with ±0.2 LSB gain error, 12-channel TSSOP-38 package, and integrated alarm logic for autonomous fault detection without host intervention.
Technical Context
The ADS7956QDBTRQ1 implements a capacitor-based successive approximation register (SAR) architecture with inherent sample-and-hold, enabling precise single-shot conversions at up to 1 MSPS. Its multiplexer supports auto- or manual channel sequencing across 12 single-ended inputs (CH0–CH11), with MXO output feeding the internal ADC core.
Digital control includes SPI-compatible serial interface (CS, SCLK, SDI, SDO), programmable GPIOs (GPIO0–GPIO3) supporting alarm outputs and range selection, and two independent per-channel threshold registers (high/low alarm) referenced to the external 2.5-V REF5025 reference. Power-down mode draws only 1 µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1024 discrete digital codes for accurate voltage quantization in automotive sensor interfaces. |
| Sample Rate | 1 MSPS - supports real-time monitoring of fast transients in 12V/48V battery systems and DC-DC converter feedback loops. |
| Analog Supply Range | 2.7 V to 5.25 V - compatible with wide-input automotive power supplies and isolated bias rails. |
| Input Ranges | 0 V to 2.5 V or 0 V to 5 V - selectable via GPIO2; enables direct connection to both low-voltage sensors and high-side shunt monitors. |
| Gain Error | ±0.1 LSB (Range 2) - ensures <0.01% full-scale accuracy over temperature, critical for calibrated voltage measurement. |
| Power-Down Current | 1 µA - reduces quiescent load during vehicle sleep modes while retaining configuration state. |
| Alarm Thresholds | Two per channel (hex 000–FFC) - allows independent high/low trip points for overvoltage and undervoltage detection on each monitored rail. |
Pinout & Package
The ADS7956QDBTRQ1 is housed in a 38-pin TSSOP package (9.70 mm × 4.40 mm) with exposed thermal pad, rated for automotive Grade 1 operation (–40°C to 125°C ambient).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH11 | Analog input channels | 12 single-ended inputs routed through internal multiplexer; CH0–CH7 on pins 29–22, CH8–CH11 on pins 18–15. |
| AINP | ADC signal input | Primary analog input node for converted signal; accepts buffered or directly driven sources with ≤15 pF input capacitance. |
| REFP / REFM | Reference voltage terminals | Accept external 2.5-V reference (e.g., REF5025); REFP is high-impedance input, REFM is reference ground return. |
| CS / SCLK / SDI / SDO | SPI interface signals | Standard 4-wire SPI: CS enables conversion, SCLK clocks data, SDI configures registers, SDO outputs conversion results MSB-first. |
| GPIO0–GPIO3 | Programmable I/O | GPIO2 selects input range; GPIO0/GPIO1 output active-high alarms; GPIO3 is active-low power-down control. |
| +VA / AGND / +VBD / BDGND | Power and ground domains | +VA/AGND powers analog section; +VBD/BDGND powers digital I/O (1.7–5.25 V), enabling level-shifting between domains. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualified | Validated for –40°C to 125°C ambient operation with HBM ESD Level H2 and CDM Level C4B - meets automotive reliability requirements. |
| Per-channel programmable alarms | Two independent hex-configurable thresholds per channel enable autonomous fault signaling without CPU polling overhead. |
| Four configurable GPIOs | GPIOs support mixed input/output roles including range selection, alarm indication, and power-down activation - reducing external logic count. |
| 12-channel TSSOP-38 footprint | Shares 38-pin layout with 12- and 16-channel family members (e.g., ADS7960-Q1), simplifying PCB design reuse across resolution variants. |
| Low-power 1-MSPS operation | 14.5 mW typical at 5 V analog supply and 1 MSPS - balances speed and efficiency for always-on vehicle subsystems. |
Applications
| Automotive Battery Monitoring | ADAS Power Rail Supervision |
|---|---|
Use Scenario: Real-time monitoring of 12V starter battery and 48V mild-hybrid auxiliary battery voltages under cranking and regenerative braking conditions. IC Role / Device Role / Timing Role: 12-channel ADC digitizes multiple battery cell taps and bus voltages; alarms trigger immediate CAN fault frames upon overvoltage or deep discharge. Use Value: Enables predictive battery health reporting and failsafe shutdown before thermal runaway, using only one IC instead of discrete comparators and muxes. | Use Scenario: Continuous supervision of power rails supplying radar SoCs, camera ISPs, and domain controller MCUs in L2+ ADAS systems. IC Role / Device Role / Timing Role: Simultaneously samples 12 rails (e.g., 1.8 V, 3.3 V, 5 V, 12 V) with sub-millisecond update rate; GPIO0 asserts high-alarm flag if any rail deviates >3% from nominal. Use Value: Reduces BOM cost by replacing six dual-supply supervisors with a single configurable device, while adding diagnostic logging capability via SPI. |
| Electric Power Steering (EPS) Feedback | Onboard Charger (OBC) Control |
Use Scenario: Sampling motor phase currents, torque sensor outputs, and DC-link voltage in EPS ECUs to implement closed-loop torque control and fault detection. IC Role / Device Role / Timing Role: Converts analog feedback signals at 1 MSPS with <1 µs aperture delay; alarms flag current spikes exceeding safe torque limits within 2 µs. Use Value: Meets ISO 26262 ASIL-B timing constraints for safety-critical torque path monitoring without requiring additional FPGA or ASIC logic. | Use Scenario: Monitoring AC input rectification, DC-link capacitors, and isolated gate driver supplies in bidirectional OBCs for EVs. IC Role / Device Role / Timing Role: Digitizes 12 high-voltage and isolation-barrier-referenced signals; uses GPIO3 to enter ultra-low-power mode when vehicle is parked. Use Value: Achieves <10 µA system standby current by leveraging 1 µA ADC power-down, meeting EU CO₂ fleet emission compliance for parked-state leakage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel automotive ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7957QDBTRQ1 | 10-bit, 16-channel variant in same TSSOP-38 package; adds CH12–CH15 but no change in resolution or speed. | Required when >12 analog inputs must be monitored without external muxing; identical timing and alarm functionality. | Select ADS7957QDBTRQ1 if future expansion to 16 channels is planned; pinout and firmware are fully compatible. |
| ADS7960QDBTRQ1 | 12-bit, 12-channel version with same package and interface; improves resolution to 12 bits and reduces INL to ±0.75 LSB. | Used where higher precision is needed (e.g., shunt-based current sensing with <0.5% error budget), at cost of slightly higher power (15.2 mW). | Choose ADS7960QDBTRQ1 when absolute accuracy dominates over power or cost; shares identical pinout and register map. |
Compared with ADS7957QDBTRQ1 and ADS7960QDBTRQ1, the ADS7956QDBTRQ1 offers optimal balance of channel count, 10-bit precision, and 14.5-mW power for cost-sensitive automotive body and chassis applications where 10-bit resolution suffices.
Availability
ADS7956QDBTRQ1 is available at Aetrix Electronics and suitable for automotive battery management, ADAS power supervision, and electric power steering systems requiring stable component supply across extended vehicle lifecycles.
Supply support for ADS7956QDBTRQ1 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, embedded processing, and automotive electronics with broad portfolio coverage and long-term product longevity commitments.
The ADS79xx-Q1 product line was designed specifically for automotive signal acquisition in harsh environments - delivering AEC-Q100 qualified, high-channel-count, low-power SAR ADCs with integrated alarm and GPIO flexibility for domain controllers and ECUs.
FAQ
What is the maximum sampling rate supported by the ADS7956QDBTRQ1?
The ADS7956QDBTRQ1 supports a maximum throughput rate of 1 MSPS (1 million samples per second) when operated with a 20-MHz SCLK. This is achieved with a fixed 16-clock conversion cycle and 800-ns conversion time, enabling real-time capture of fast transients in automotive power systems without oversampling penalties.
Does the ADS7956QDBTRQ1 require an external reference voltage?
Yes, the ADS7956QDBTRQ1 requires an external precision reference applied to the REFP pin, with REFM serving as its dedicated ground return. The device supports 2.0 V to 3.0 V references; TI recommends REF5025 (2.5 V) for optimal SNR. Internal reference generation is not supported - all accuracy specifications assume external reference stability and low noise.
How are the programmable alarm thresholds configured on the ADS7956QDBTRQ1?
Alarm thresholds on the ADS7956QDBTRQ1 are configured via SPI writes to dedicated 12-bit registers - one for high threshold and one for low threshold per channel. Values are entered in hexadecimal format (000h to FFCh), scaled linearly across the selected input range (0–2.5 V or 0–5 V). GPIO0 and GPIO1 assert active-high signals when thresholds are exceeded, independent of host polling.
Is the ADS7956QDBTRQ1 pin-compatible with other devices in the ADS79xx-Q1 family?
Yes, the ADS7956QDBTRQ1 shares the same 38-pin TSSOP (DBT) package and pinout with all 12- and 16-channel variants in the ADS79xx-Q1 family, including ADS7957QDBTRQ1 and ADS7960QDBTRQ1. This enables drop-in replacement across resolution and channel-count variants without PCB redesign, provided firmware handles differing resolution and register behavior.
What is the operating temperature range for the ADS7956QDBTRQ1?
The ADS7956QDBTRQ1 is qualified for automotive Grade 1 operation with a specified ambient temperature range of –40°C to +125°C. This rating is validated per AEC-Q100 standards, including thermal cycling, high-temperature operating life, and package reliability tests - ensuring robust performance in engine bay, under-hood, and transmission-mounted applications.
ADS7956QDBTRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 38-TFSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 10
- Sampling Rate (Per Second):
- 1M
- Number of Inputs:
- 12
- Input Type:
- Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-PGA-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.7V ~ 5.25V
- Voltage - Supply, Digital:
- 1.7V ~ 5.25V
- Features:
- PGA
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 38-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- Automotive
- Qualification:
- AEC-Q100
ADS7956QDBTRQ1 FAQ
1.How can I place an order for ADS7956QDBTRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7956QDBTRQ1 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 ADS7956QDBTRQ1 reliable?
The price and inventory of ADS7956QDBTRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7956QDBTRQ1 is usually 5 days.
3.What payment methods are accepted for ADS7956QDBTRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7956QDBTRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7956QDBTRQ1?
ADS7956QDBTRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7956QDBTRQ1 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 ADS7956QDBTRQ1?
For technical support, including ADS7956QDBTRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7956QDBTRQ1 requirements.
6.How does Aetrix verify that ADS7956QDBTRQ1 is sourced from the original manufacturer or authorized distributors?
All ADS7956QDBTRQ1 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 ADS7956QDBTRQ1 meets industry standards.
7.What is the process for return or replacement of ADS7956QDBTRQ1?
All ADS7956QDBTRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7956QDBTRQ1, 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 ADS7956QDBTRQ1 part is unused and in its original packaging.
Return procedure for ADS7956QDBTRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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