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Texas Instruments ADS7957QDBTRQ1
- Part No.:
- ADS7957QDBTRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 38-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADS7957QDBTRQ1.pdf
- Description:
- IC ADC 10BIT SAR 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,800
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Product details
Overview
ADS7957QDBTRQ1 from Texas Instruments is a 10-bit, 16-channel automotive-grade SAR ADC with 1-MSPS throughput, programmable unipolar input ranges (0–2.5 V or 0–5 V), dual alarm thresholds per channel, and four configurable GPIOs. It operates from 2.7 V to 5.25 V analog supply and supports isolated, battery-powered systems such as EV battery monitoring and powertrain sensor interfaces.
For engineers reviewing the ADS7957QDBTRQ1 datasheet, ADS7957QDBTRQ1 pinout, ADS7957QDBTRQ1 application, or ADS7957QDBTRQ1 equivalent, key selection criteria include its AEC-Q100 Grade 1 qualification (–40°C to 125°C), TSSOP-38 package, 10-bit resolution with ±0.2 LSB gain error, GPIO alarm outputs, and serial SPI-compatible interface with 20-MHz SCLK support.
Technical Context
The ADS7957QDBTRQ1 implements a capacitor-based successive approximation register (SAR) architecture with integrated sample-and-hold, enabling precise single-shot conversions without external hold circuitry. Its 16-channel analog multiplexer feeds into a high-input-impedance PGA (or non-inverting buffer), supporting direct connection to resistive sensors and current-sense amplifiers.
Digital control includes auto/manual channel selection, two SW-selectable unipolar input ranges, and independent programming of high/low alarm thresholds per channel. The four GPIOs serve as alarm indicators (GPIO0/GPIO1), range select (GPIO2), or power-down enable (GPIO3), all configurable via SPI register writes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10 bits - delivers 1024 discrete output codes for medium-precision sensor digitization in automotive ECUs. |
| Sample Rate | 1 MSPS - supports real-time acquisition of fast transients in motor control feedback loops. |
| Analog Supply Range | 2.7 V to 5.25 V - compatible with 3.3 V and 5 V automotive rails without level-shifting. |
| I/O Supply Range | 1.7 V to 5.25 V - enables direct interfacing with 1.8 V, 3.3 V, or 5 V host microcontrollers. |
| Input Ranges | 0–2.5 V or 0–5 V - selectable per system reference voltage (e.g., REF5025 or internal 2.5 V ref). |
| Power Dissipation | 14.5 mW at 5 V VA and 1 MSPS - enables thermally constrained placement in dense ECU modules. |
| Power-Down Current | 1 μA - extends battery life in always-on vehicle subsystems during sleep mode. |
Pinout & Package
The ADS7957QDBTRQ1 is housed in a 38-pin TSSOP package (9.70 mm × 4.40 mm) with exposed pad for thermal performance in automotive under-hood environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH15 | Analog input channels | 16 single-ended inputs routed through internal mux; no external buffering required for low-Z sources. |
| AINP / AINM | Differential analog input pair | Supports pseudo-differential measurement or external PGA feedback path. |
| REFP / REFM | Reference voltage inputs | Accepts external 2–3 V reference (e.g., REF5025); REFM tied to AGND for unipolar operation. |
| CS / SCLK / SDI / SDO | SPI interface signals | Full-duplex 4-wire SPI with MSB-first format; supports daisy-chaining multiple devices. |
| GPIO0–GPIO3 | Programmable I/O terminals | GPIO0/GPIO1 = active-high alarm flags; GPIO2 = range select; GPIO3 = active-low power-down. |
| +VA / AGND / +VBD / BDGND | Power and ground domains | Separate analog/digital supplies reduce noise coupling; AGND and BDGND must be connected at single point. |
Key Features
| Feature | Design Value |
|---|---|
| Two programmable alarm levels per channel | Enables autonomous overvoltage/undervoltage detection without host CPU polling-reduces MCU interrupt load in safety-critical systems. |
| Four individually configurable GPIOs | Provides hardware-triggered status signaling (e.g., GPIO0 = high-alarm, GPIO1 = low-alarm), eliminating need for software flag registers. |
| SW-selectable unipolar input ranges | Allows dynamic adaptation to varying sensor output spans (e.g., 0–2.5 V throttle position vs. 0–5 V coolant temp) without external resistor networks. |
| AEC-Q100 Grade 1 qualification | Validated for –40°C to 125°C ambient operation with HBM ESD Level H2 and CDM Level C4B-meets automotive module reliability requirements. |
| 1-μA power-down mode | Permits integration into always-on vehicle networks (e.g., LIN gateway wake-up circuits) with negligible quiescent current draw. |
Applications
| Electric Vehicle Battery Monitoring | Powertrain Sensor Interface |
|---|---|
Use Scenario: Real-time sampling of 16-cell voltage and temperature readings in a 400 V traction battery pack. IC Role / Device Role / Timing Role: 10-bit SAR ADC with channel sequencing and per-cell alarm thresholds for cell imbalance detection. Use Value: Enables autonomous high/low voltage fault reporting via GPIO0/GPIO1, reducing CAN bus traffic and host processing latency. | Use Scenario: Acquisition of crankshaft position, camshaft timing, and intake manifold pressure in gasoline direct injection engines. IC Role / Device Role / Timing Role: Multichannel analog front-end with 1-MSPS throughput and deterministic conversion timing for closed-loop combustion control. Use Value: Supports synchronized sampling across 16 sensors using auto-channel mode, ensuring phase-coherent data for misfire detection algorithms. |
| Automotive Body Control Module | ADAS Power Supply Monitoring |
Use Scenario: Monitoring door lock actuators, mirror position sensors, and interior lighting drivers in centralized body electronics units. IC Role / Device Role / Timing Role: General-purpose 10-bit ADC with GPIO alarm outputs for overcurrent and open-load detection on each actuator channel. Use Value: Eliminates need for discrete comparators and logic gates by embedding threshold logic directly in ADC configuration registers. | Use Scenario: Supervision of multiple DC-DC converter outputs (e.g., 1.2 V, 1.8 V, 3.3 V, 5 V) powering radar SoCs and camera ISPs. IC Role / Device Role / Timing Role: High-accuracy voltage monitor with 0.2 LSB gain error and 2.5 V reference input for ±1% regulation verification. Use Value: Delivers stable 10-bit measurements across temperature (–40°C to 125°C) without calibration, meeting ISO 26262 ASIL-B diagnostic coverage requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7953QDBTRQ1 | 12-bit resolution, 16-channel, same TSSOP-38 package and pinout; higher INL (±0.75 LSB) and SNR (71.3 dB) | Better suited for precision current sensing where 12-bit resolution improves dynamic range | Select when >10-bit ENOB is required and system can accommodate higher power (16.5 mW typical) |
| ADS7956QDBTRQ1 | 10-bit, 12-channel, TSSOP-38; identical electrical specs but fewer analog inputs | Applicable where only 12 sensor channels are needed, reducing BOM count and routing complexity | Choose for cost-optimized designs with lower channel count and identical performance envelope |
Compared with ADS7953QDBTRQ1 and ADS7956QDBTRQ1, the ADS7957QDBTRQ1 provides optimal balance of 10-bit accuracy, full 16-channel count, and minimal power consumption-making it ideal for mid-tier automotive ECUs requiring scalable sensor acquisition without over-specifying resolution.
Availability
ADS7957QDBTRQ1 is available at Aetrix Electronics and suitable for electric vehicle battery monitoring, powertrain sensor interface, and ADAS power supply monitoring requiring stable component supply across extended automotive temperature ranges and long production lifecycles.
Supply support for ADS7957QDBTRQ1 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 IC design and AEC-Q100 qualification.
The ADS79xx-Q1 product line was engineered specifically for automotive signal acquisition in harsh environments-delivering multichannel, micropower, SPI-interfaced ADCs with integrated alarms and GPIOs for ECU, battery management, and ADAS subsystems.
FAQ
What is the maximum SCLK frequency supported by the ADS7957QDBTRQ1?
The ADS7957QDBTRQ1 supports up to 20 MHz SCLK frequency, enabling full 16-bit SPI frame transfers within 800 ns conversion time. This allows sustained 1-MSPS throughput with minimal overhead, making ADS7957QDBTRQ1 suitable for time-critical automotive control loops where deterministic latency is essential.
Does the ADS7957QDBTRQ1 require an external reference voltage?
Yes, the ADS7957QDBTRQ1 requires an external reference voltage applied to REFP (2–3 V range), with REFM connected to AGND. It does not include an internal reference; common choices include TI's REF5025 (2.5 V) or REF3330 (3.0 V). Reference stability directly impacts gain error and total unadjusted error-critical for automotive voltage monitoring applications.
How are the alarm thresholds configured on the ADS7957QDBTRQ1?
Alarm thresholds on the ADS7957QDBTRQ1 are programmed via SPI write to dedicated 10-bit threshold registers-one for high alarm and one for low alarm per channel. Threshold values are hex-encoded (000h to FFCh) and compared against conversion results in real time; matching triggers GPIO0 (high) or GPIO1 (low) with no host intervention required.
Is the ADS7957QDBTRQ1 pin-compatible with other devices in the ADS79xx-Q1 family?
Yes, the ADS7957QDBTRQ1 shares identical pinout and footprint with all 38-pin TSSOP variants in the ADS79xx-Q1 family-including ADS7953QDBTRQ1 (12-bit) and ADS7956QDBTRQ1 (10-bit, 12-channel). This enables hardware reuse across platforms with only firmware-level resolution and channel-count adjustments required.
What is the operating temperature range for the ADS7957QDBTRQ1?
The ADS7957QDBTRQ1 is qualified for AEC-Q100 Grade 1 operation from –40°C to +125°C ambient temperature. Electrical specifications-including integral linearity (±0.2 LSB), gain error (±0.1 LSB), and supply current-are guaranteed across this full range, ensuring reliable performance in engine bay, battery pack, and transmission control modules.
ADS7957QDBTRQ1 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:
- 16
- 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
ADS7957QDBTRQ1 FAQ
1.How can I place an order for ADS7957QDBTRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7957QDBTRQ1 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 ADS7957QDBTRQ1 reliable?
The price and inventory of ADS7957QDBTRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7957QDBTRQ1 is usually 5 days.
3.What payment methods are accepted for ADS7957QDBTRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7957QDBTRQ1 transactions.
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4.How is shipping managed for ADS7957QDBTRQ1?
ADS7957QDBTRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7957QDBTRQ1 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 ADS7957QDBTRQ1?
For technical support, including ADS7957QDBTRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7957QDBTRQ1 requirements.
6.How does Aetrix verify that ADS7957QDBTRQ1 is sourced from the original manufacturer or authorized distributors?
All ADS7957QDBTRQ1 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 ADS7957QDBTRQ1 meets industry standards.
7.What is the process for return or replacement of ADS7957QDBTRQ1?
All ADS7957QDBTRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7957QDBTRQ1, 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 ADS7957QDBTRQ1 part is unused and in its original packaging.
Return procedure for ADS7957QDBTRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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