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Texas Instruments ADS7955QDBTRQ1
- Part No.:
- ADS7955QDBTRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 30-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADS7955QDBTRQ1.pdf
- Description:
- IC ADC 10BIT SAR 30TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,858
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Product details
Overview
ADS7955QDBTRQ1 from Texas Instruments is an automotive-qualified 10-bit, 1 MSPS, 8-channel single-ended SAR ADC with serial interface, zero-latency operation, 20-MHz SCLK support, and dual software-selectable input ranges (0–2.5 V or 0–5 V). It serves as a high-speed analog front-end for real-time sensor monitoring in battery-powered automotive control units.
For engineers reviewing the ADS7955QDBTRQ1 datasheet, ADS7955QDBTRQ1 pinout, ADS7955QDBTRQ1 application, or ADS7955QDBTRQ1 equivalent, key selection criteria include its AEC-Q100 Grade 1 qualification, 1 μA power-down current, four programmable GPIOs in TSSOP package, 47 MHz full-power bandwidth, and channel sequencing flexibility (manual/auto-1/auto-2 modes).
Technical Context
The ADS7955QDBTRQ1 implements a capacitor-based SAR architecture with integrated sample-and-hold, enabling true zero-latency conversion - output data is valid before the next CS falling edge. Its serial interface uses CS-controlled sampling and SCLK-synchronized 16-bit frames (4-bit channel address + 12-bit result, MSB-first), supporting both command-driven channel selection and autonomous auto-sequencing.
It features two independently programmable alarm thresholds per channel, mapped to GPIO0/GPIO1 outputs, and supports asynchronous power-down via GPIO3 (PD input) or synchronous shutdown via mode register bit DI05. The device operates across –40°C to +125°C with ±0.5 LSB integral linearity and 60 dB SNR at 100 kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit SAR with no missing codes guaranteed - ensures monotonicity and deterministic quantization for closed-loop feedback. |
| Sample Rate | 1 MSPS maximum throughput - supports real-time acquisition of fast transients in motor control or power supply monitoring. |
| Analog Supply Range | +VA = 2.7 V to 5.25 V - enables direct connection to automotive 3.3 V or 5 V rails without LDO buffering. |
| I/O Supply Range | +VBD = 1.7 V to 5.25 V - allows glue-less interfacing with 1.8 V, 3.3 V, or 5 V microcontrollers and FPGAs. |
| Power Dissipation | 14.5 mW typical at 1 MSPS (+VA = 5 V, +VBD = 3 V) - balances speed and efficiency for thermally constrained ECUs. |
| Power-Down Current | 1 μA - reduces quiescent draw during idle cycles in always-on vehicle subsystems. |
| Input Bandwidth | 47 MHz (–3 dB) - preserves signal integrity for high-frequency sensor outputs like resolver or current shunt waveforms. |
Pinout & Package
ADS7955QDBTRQ1 is housed in a 30-pin TSSOP package (DBT), RoHS-compliant, moisture sensitivity level MSL3, rated for automotive temperature range (–40°C to +125°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select Input | Falling edge initiates sampling and frame start; controls 3-state output timing on SDO. |
| SCLK | Serial Clock Input | 20 MHz max clock synchronizes 16-bit SDI/SDO transfers; defines conversion timing and data validity windows. |
| SDI / SDO | Serial Data I/O | Full-duplex interface: SDI accepts 16-bit configuration frames; SDO outputs 4-bit channel ID + 12-bit result or GPIO status. |
| REFP / REFM | Reference Inputs | Accept external 2.5 V reference (±0.1 V tolerance); REFM is reference ground - enables precise ratiometric measurements. |
| AINP / AGND | Analog Signal Input | Single-ended input pair referenced to AGND; supports 0–2.5 V or 0–5 V unipolar ranges via GPIO2 control. |
| GPIO0–GPIO3 | Configurable I/O Terminals | Four pins individually assignable as GPI, GPO, or dedicated functions (alarm outputs, range select, power-down). |
| +VA / AGND | Analog Power/Ground | Separate analog domain (2.7–5.25 V) minimizes digital noise coupling into conversion path. |
| +VBD / BDGND | Digital I/O Power/Ground | Independent 1.7–5.25 V digital supply isolates logic switching noise from analog section. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-Latency Conversion | Output data valid before next CS falling edge - eliminates pipeline delay in time-critical control loops. |
| Auto/Manual Channel Sequencing | Three selectable modes (Manual, Auto-1, Auto-2) with nonvolatile program registers - simplifies firmware for multi-sensor polling without host CPU overhead. |
| Dual Programmable Input Ranges | Software-switchable 0–2.5 V or 0–5 V full-scale spans - accommodates diverse sensor outputs (e.g., 0–5 V throttle position vs. 0–2.5 V temperature). |
| Per-Channel Alarm Thresholds | Two independent hex-configurable thresholds (000–FFC) per channel - enables hardware-triggered fault detection without continuous host polling. |
| Automotive Qualification | AEC-Q100 Grade 1 (–40°C to +125°C), HBM ESD 2 kV, CDM >500 V - validated for under-hood and safety-critical applications. |
Applications
| PLC / IPC | Battery Powered Systems |
|---|---|
Use Scenario: Analog input module in industrial programmable logic controllers acquiring voltage/current signals from field sensors. IC Role / Device Role / Timing Role: Primary 8-channel ADC front-end with auto-sequencing and alarm-triggered GPIO outputs for immediate fault signaling. Use Value: 1 MSPS throughput and 47 MHz bandwidth capture fast transients in motor drives; 1 μA power-down extends runtime during standby. | Use Scenario: Sensor hub in portable diagnostic tools or telematics units powered by Li-ion batteries. IC Role / Device Role / Timing Role: Low-power analog acquisition engine managing multiple vehicle subsystem sensors (coolant temp, brake pressure, cabin air quality). Use Value: Dual supply domains (+VA/+VBD) enable independent rail optimization; 2.7 V minimum +VA supports deep battery discharge operation. |
| Medical Instrumentation | Digital Power Supplies |
Use Scenario: Patient monitoring equipment requiring high-accuracy, low-noise acquisition of biopotential signals (ECG, EEG). IC Role / Device Role / Timing Role: Precision 10-bit ADC with ±0.5 LSB INL and 60 dB SNR delivering clinical-grade signal fidelity. Use Value: Zero-latency operation ensures real-time waveform rendering; REFP/REFM inputs support stable ratiometric reference for calibration stability. | Use Scenario: Voltage/current sensing in digitally controlled DC-DC converters and inverters for EV charging systems. IC Role / Device Role / Timing Role: High-speed feedback ADC feeding PID controller in closed-loop regulation loop. Use Value: 1 MSPS sampling captures switching ripple harmonics; programmable alarms trigger immediate overcurrent shutdown via GPIO0. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit automotive ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7953QDBTRQ1 | 4-channel variant, identical architecture, same package and pinout - shares all registers and timing. | Reduced channel count suits simpler BMS or lighting control where only 4 analog inputs are needed. | Select when system requires fewer channels and board space or cost reduction is prioritized over channel scalability. |
| ADS7957QDBTRQ1 | 12-channel version, same 10-bit resolution, 1 MSPS, identical GPIO/alarm features and TSSOP-30 footprint. | Supports denser sensor arrays in ADAS or chassis control modules requiring >8 analog inputs. | Choose for future-proofing or designs anticipating channel expansion without layout change. |
Compared with ADS7955QDBTRQ1, ADS7953QDBTRQ1 reduces channel count while maintaining identical performance and interface behavior, whereas ADS7957QDBTRQ1 extends channel capacity within the same mechanical and electrical envelope - both offer drop-in compatibility for scalable automotive sensor acquisition platforms.
Availability
ADS7955QDBTRQ1 is available at Aetrix Electronics and suitable for PLC/IPC, battery-powered automotive diagnostics, medical instrumentation, and digital power supplies requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for ADS7955QDBTRQ1 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 ICs, with decades of expertise in high-reliability signal chain solutions.
The ADS79xx-Q1 product line delivers automotive-qualified multichannel SAR ADCs optimized for real-time sensor data acquisition in harsh environments - designed specifically for functional safety-critical applications including powertrain, chassis, and body electronics.
FAQ
What is the absolute maximum analog input voltage for ADS7955QDBTRQ1?
The absolute maximum analog input voltage (AINP or CHn to AGND) for ADS7955QDBTRQ1 is –0.3 V to +VA + 0.3 V. For example, with +VA = 5.25 V, the safe input range is –0.3 V to +5.55 V. Exceeding this may cause permanent damage. This rating is specified in the Absolute Maximum Ratings table of the SLAS814 datasheet and applies across the full operating temperature range.
Does ADS7955QDBTRQ1 support simultaneous sampling across all 8 channels?
No, ADS7955QDBTRQ1 does not support simultaneous sampling. It is a successive approximation register (SAR) ADC with a single conversion core and multiplexer-based sequential sampling. Channels are acquired one at a time, with acquisition time of 325 ns and conversion time of 800 ns per sample. The device achieves 1 MSPS aggregate throughput by interleaving acquisition and conversion phases across the channel sequence.
How is the reference voltage configured for ADS7955QDBTRQ1?
ADS7955QDBTRQ1 uses an external reference applied to the REFP pin, with REFM serving as reference ground. The recommended reference voltage is 2.5 V ± 0.1 V, though the device supports 2.0 V to 3.0 V per specifications. Reference impedance must be ≤100 kΩ. Internal reference is not available - REFP/REFM must be driven externally for all conversions, including alarm threshold comparisons.
Can ADS7955QDBTRQ1 operate with different analog and digital supply voltages?
Yes, ADS7955QDBTRQ1 supports independent analog and digital supplies: +VA (2.7–5.25 V) powers the ADC core and analog front-end, while +VBD (1.7–5.25 V) powers the digital I/O interface. This separation allows interfacing with 1.8 V microcontrollers while running the ADC at 5 V for improved SNR, and is explicitly supported in all timing and electrical specifications of the ADS7955QDBTRQ1 datasheet.
What GPIO functionality is available on ADS7955QDBTRQ1 in the TSSOP package?
ADS7955QDBTRQ1 in the 30-pin TSSOP package provides four individually configurable GPIOs (GPIO0–GPIO3). Each can be set as general-purpose input/output or assigned dedicated functions: GPIO0/GPIO1 for high/low alarm outputs, GPIO2 for input range selection (Range 1/Range 2), and GPIO3 as asynchronous active-low power-down input. Configuration is performed via SDI register writes per Table 10 in the SLAS814 datasheet.
ADS7955QDBTRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 30-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:
- 8
- 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:
- 30-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- Automotive
- Qualification:
- AEC-Q100
ADS7955QDBTRQ1 FAQ
1.How can I place an order for ADS7955QDBTRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7955QDBTRQ1 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 ADS7955QDBTRQ1 reliable?
The price and inventory of ADS7955QDBTRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7955QDBTRQ1 is usually 5 days.
3.What payment methods are accepted for ADS7955QDBTRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7955QDBTRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7955QDBTRQ1?
ADS7955QDBTRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7955QDBTRQ1 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 ADS7955QDBTRQ1?
For technical support, including ADS7955QDBTRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7955QDBTRQ1 requirements.
6.How does Aetrix verify that ADS7955QDBTRQ1 is sourced from the original manufacturer or authorized distributors?
All ADS7955QDBTRQ1 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 ADS7955QDBTRQ1 meets industry standards.
7.What is the process for return or replacement of ADS7955QDBTRQ1?
All ADS7955QDBTRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7955QDBTRQ1, 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 ADS7955QDBTRQ1 part is unused and in its original packaging.
Return procedure for ADS7955QDBTRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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