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Texas Instruments ADS7950SBDBT
- Part No.:
- ADS7950SBDBT
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 30-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADS7950SBDBT.pdf
- Description:
- IC ADC 12BIT SAR 30TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,147
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Product details
Overview
ADS7950SBDBT from Texas Instruments is a 12-bit, 4-channel, single-ended SAR analog-to-digital converter with 1-MSPS sample rate, zero-latency operation, and 20-MHz SPI-compatible serial interface. It features two software-selectable unipolar input ranges (0 to VREF and 0 to 2×VREF), programmable per-channel high/low alarm thresholds, and operates from 2.7–5.25 V analog supply. It is used in PLC analog input modules for real-time sensor monitoring.
For engineers reviewing the ADS7950SBDBT datasheet, ADS7950SBDBT pinout, ADS7950SBDBT application, or ADS7950SBDBT equivalent, key selection considerations include its 4-channel count, TSSOP-30 package footprint, 12-bit resolution with ±0.99 LSB DNL, GPIO0–GPIO3 configurability (four pins in TSSOP), and support for auto/manual channel sequencing in industrial data acquisition systems.
Technical Context
The ADS7950SBDBT implements a capacitor-based SAR architecture with integrated sample-and-hold, enabling zero-latency conversion. Its serial interface uses active-low CS, SCLK, SDI, and SDO signals for microprocessor/DSP interfacing, with sampling triggered on the falling edge of CS.
It supports dual input ranges via the RANGE pin (GPIO2), provides two programmable alarm levels per channel, and includes four individually configurable GPIOs (GPIO0–GPIO3) in the TSSOP package-enabling alarm signaling, power-down control (PD on GPIO3), and range selection without external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for precise sensor digitization |
| Sample Rate | 1 MSPS - supports real-time capture of fast transients in closed-loop control |
| Analog Supply Range | 2.7 V to 5.25 V - enables direct connection to common industrial rails (3.3 V, 5 V) |
| I/O Supply Range | 1.7 V to 5.25 V - allows glueless interfacing with 1.8-V, 3.3-V, or 5-V digital hosts |
| Input Bandwidth | 47 MHz at 3 dB - preserves signal integrity for wideband sensor outputs |
| Power Dissipation | 14.5 mW at 1 MSPS (+VA = 5 V, +VBD = 3 V) - suitable for thermally constrained modules |
| Power-Down Current | 1 μA - extends battery life or reduces idle power in intermittent-sampling systems |
Pinout & Package
ADS7950SBDBT is housed in a 30-pin TSSOP (DBT) package measuring 7.80 mm × 4.40 mm, with exposed thermal pad for enhanced heat dissipation in industrial environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AINP / AINM | Differential analog input pair | Accepts buffered or unbuffered single-ended signals; AINM tied to AGND for true single-ended mode |
| CH0–CH3 | Analog input channels | Four dedicated single-ended analog inputs routed through internal multiplexer to AINP |
| MXO | Multiplexer output | Provides buffered analog output of selected channel for external monitoring or PGA feedback |
| REFP / REFM | Reference voltage terminals | Support external reference (e.g., REF5025) or internal reference bypass; REFP accepts 2.5 V ±0.1 V |
| CS / SCLK / SDI / SDO | SPI-compatible serial interface | Enable synchronous communication with host MCU; CS falling edge initiates sampling |
| GPIO0–GPIO3 | Programmable digital I/O | Configurable as alarm outputs (high/low), range select (GPIO2), or power-down (GPIO3, active low) |
| +VA / AGND | Analog power domain | Separate analog supply and ground reduce noise coupling into sensitive ADC core |
| +VBD / BDGND | Digital I/O power domain | Independent digital rail allows level-shifting between host and ADC logic |
Key Features
| Feature | Design Value |
|---|---|
| Zero-latency conversion | Eliminates pipeline delay - critical for high-speed closed-loop feedback where timing determinism is required |
| Two programmable alarm levels per channel | Enables autonomous over/under-range detection without host intervention, reducing CPU load in PLC scan cycles |
| Auto and manual channel sequencing | Auto mode scans preselected channels continuously; manual mode allows dynamic channel selection per conversion cycle |
| 4-GPIO configuration in TSSOP | GPIO0–GPIO3 support mixed input/output roles - e.g., GPIO2 selects input range, GPIO3 asserts PD, GPIO0/1 drive alarm flags |
| Wide input voltage range support | 0 to VREF or 0 to 2×VREF selection accommodates both 0–2.5 V and 0–5 V sensor outputs with same hardware layout |
Applications
| PLC Analog Input Module | Optical Line Card Monitoring |
|---|---|
Use Scenario: Digitizing 4-channel 4–20 mA current loop signals from field sensors in modular I/O racks. IC Role / Device Role / Timing Role: Primary ADC performing synchronized sampling of isolated analog inputs; zero-latency ensures deterministic response within 1 µs of CS assertion. Use Value: Four integrated channels eliminate need for multiple 1-channel ADCs, reducing BOM count and PCB area while maintaining 12-bit precision across all inputs. |
Use Scenario: Real-time monitoring of laser bias current, TEC voltage, and photodiode outputs in telecom line cards. IC Role / Device Role / Timing Role: High-speed data acquisition front-end with per-channel alarms triggering fault reporting before optical link degradation occurs. Use Value: Programmable alarm thresholds enable adaptive thresholding per parameter, improving reliability over temperature without host recalibration. |
| Medical Patient Monitor Front-End | Digital Power Supply Telemetry |
Use Scenario: Sampling ECG lead voltages, respiration impedance, and temperature sensor outputs in portable diagnostic devices. IC Role / Device Role / Timing Role: Low-power, multi-channel ADC operating in burst mode - powers down between samples using GPIO3-controlled PD mode. Use Value: 1 μA power-down current extends battery runtime; 14.5 mW active power enables continuous 1-kSPS monitoring without thermal throttling. |
Use Scenario: Measuring output voltage, inductor current, and MOSFET temperature in digitally controlled DC/DC converters. IC Role / Device Role / Timing Role: ADC providing real-time telemetry to PMBus controller; MXO output feeds external PGA for current-sense amplification. Use Value: MXO buffer isolates ADC core from external gain stage loading, preserving accuracy during simultaneous voltage/current measurement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7951SBDBT | 8-channel variant in identical TSSOP-30 package; same 12-bit resolution, 1-MSPS, and GPIO count | Supports higher channel density without layout change - ideal when system scales from 4 to 8 analog inputs | Select ADS7951SBDBT if future expansion to 8 channels is planned and board space is constrained |
| ADS8684IPWR | 16-bit, 4-channel SAR ADC; wider analog supply (4.75–5.25 V only); no GPIOs; uses pseudo-differential input architecture | Higher resolution for precision metrology; lacks alarm/GPIO features - requires external logic for thresholding | Choose ADS8684IPWR only when 16-bit ENOB is mandatory and alarm autonomy is handled externally |
Compared with ADS7951SBDBT, the ADS7950SBDBT offers lower channel count but identical timing, power, and interface behavior - simplifying firmware reuse. Versus ADS8684IPWR, it trades resolution for integrated alarm logic and broader supply flexibility, better fitting cost-sensitive industrial monitoring.
Availability
ADS7950SBDBT is available at Aetrix Electronics and suitable for PLC/IPC analog input modules, optical line card monitoring systems, and medical instrumentation requiring stable component supply, long-term manufacturability, and TI-qualified industrial-grade performance.
Supply support for ADS7950SBDBT 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 decades of expertise in precision data converters and industrial interface solutions.
The ADS79xx family was designed specifically for high-channel-count, medium-speed industrial data acquisition - balancing resolution, speed, integration, and robustness for harsh electromagnetic environments.
FAQ
What is the maximum clock frequency supported by the ADS7950SBDBT serial interface?
The ADS7950SBDBT supports a 20-MHz SCLK frequency, enabling full 12-bit data transfer within 1 µs per conversion cycle. This timing aligns with its 1-MSPS sample rate specification and ensures reliable communication with modern microcontrollers and DSPs without requiring wait states or clock dividers.
Does the ADS7950SBDBT require an external reference voltage?
Yes, the ADS7950SBDBT requires an external reference applied to REFP and REFM. The device supports a 2.5 V ±0.1 V reference (e.g., REF5025) and does not include an internal reference. Using a precision external reference ensures total unadjusted error remains within ±1.5 LSB over temperature and supply variations.
How many analog input channels does the ADS7950SBDBT support?
The ADS7950SBDBT supports exactly four single-ended analog input channels (CH0–CH3), as confirmed by the device comparison table and pin functions documentation. It belongs to the 4-channel subset of the ADS79xx family and shares the same TSSOP-30 footprint with ADS7954 (10-bit) and ADS7958 (8-bit) variants.
Can the ADS7950SBDBT operate with separate analog and digital supplies?
Yes, the ADS7950SBDBT uses independent supply domains: +VA (2.7–5.25 V) for analog circuitry and +VBD (1.7–5.25 V) for digital I/O. This separation minimizes digital switching noise coupling into the ADC core and allows flexible interfacing - for example, +VA = 5 V for analog front-end and +VBD = 3.3 V for MCU compatibility.
What is the function of the MXO pin on the ADS7950SBDBT?
The MXO (Multiplexer Output) pin on the ADS7950SBDBT provides a buffered analog copy of the currently selected channel's input signal. It can drive external circuitry such as a high-impedance PGA (e.g., THS4031) or be monitored for signal integrity verification - without loading the primary AINP path or affecting conversion accuracy.
ADS7950SBDBT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- microPOWER™
- Package/Case:
- 30-TFSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 1M
- Number of Inputs:
- 4
- Input Type:
- Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-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:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 30-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS7950SBDBT FAQ
1.How can I place an order for ADS7950SBDBT through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7950SBDBT 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 ADS7950SBDBT reliable?
The price and inventory of ADS7950SBDBT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7950SBDBT is usually 5 days.
3.What payment methods are accepted for ADS7950SBDBT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7950SBDBT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7950SBDBT?
ADS7950SBDBT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7950SBDBT 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 ADS7950SBDBT?
For technical support, including ADS7950SBDBT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7950SBDBT requirements.
6.How does Aetrix verify that ADS7950SBDBT is sourced from the original manufacturer or authorized distributors?
All ADS7950SBDBT 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 ADS7950SBDBT meets industry standards.
7.What is the process for return or replacement of ADS7950SBDBT?
All ADS7950SBDBT units undergo pre-shipment inspection (PSI). If there is an issue with ADS7950SBDBT, 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 ADS7950SBDBT part is unused and in its original packaging.
Return procedure for ADS7950SBDBT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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