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Texas Instruments ADS7951SBDBTR
- Part No.:
- ADS7951SBDBTR
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 30-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADS7951SBDBTR.pdf
- Description:
- IC ADC 12BIT SAR 30TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,221
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Product details
Overview
ADS7951SBDBTR from Texas Instruments is a 12-bit, 8-channel, single-ended SAR analog-to-digital converter with 1-MSPS sample rate, zero-latency operation, and integrated programmable gain amplifier (PGA) input stage. It operates from 2.7–5.25 V analog supply and supports dual unipolar input ranges (0 to VREF and 0 to 2×VREF), targeting high-speed data acquisition in PLC analog input modules.
For engineers reviewing the ADS7951SBDBTR datasheet, ADS7951SBDBTR pinout, ADS7951SBDBTR application, or ADS7951SBDBTR equivalent, key selection criteria include channel count (8), resolution (12-bit), serial interface timing (20-MHz SCLK), GPIO configurability (4 pins in TSSOP), and per-channel alarm thresholds-critical for real-time monitoring systems requiring deterministic conversion latency and flexible signal conditioning.
Technical Context
The ADS7951SBDBTR implements a capacitor-based SAR architecture with inherent sample-and-hold, sampling on the falling edge of CS and using SCLK for conversion control and serial data transfer. Its auto-sequencing mode cycles through preselected channels without host intervention, while manual mode allows dynamic channel selection per conversion cycle.
It features two software-selectable input ranges per channel, four individually configurable GPIOs (GPIO0–GPIO3), and two programmable alarm thresholds (high/low) per channel-all controlled via SPI-compatible SDI/SDO interface. The device supports glueless interfacing with microprocessors and DSPs due to its wide 1.7–5.25 V I/O supply range and active-low CS signaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = 2.44 mV at 5-V full-scale (0 to VREF) for precise industrial voltage/current sensing. |
| Sample Rate | 1 MSPS - enables capture of signals up to 500 kHz (Nyquist) in high-speed closed-loop control applications. |
| Analog Supply | 2.7 V to 5.25 V - supports direct connection to common industrial rails (3.3 V, 5 V) without LDO overhead. |
| I/O Supply Range | 1.7 V to 5.25 V - ensures interoperability with legacy 3.3-V or modern 1.8-V logic without level shifters. |
| Input Ranges | 0 to VREF and 0 to 2×VREF - selectable per channel to optimize dynamic range for varying sensor outputs (e.g., ±10 V scaled to 0–5 V). |
| Power Dissipation | 14.5 mW at 5 V analog / 3 V I/O and 1 MSPS - enables thermally constrained designs in dense I/O modules. |
| Alarm Thresholds | Two per channel (high/low) - provides hardware-triggered fault detection without CPU polling, reducing system latency. |
Pinout & Package
ADS7951SBDBTR is packaged in a 30-pin TSSOP (DBT) with 7.80 mm × 4.40 mm body size. All pins are validated per TI SLAS605C Rev C (July 2018) pin function table for ADS7951.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AINP | Analog Input | Differential positive ADC input; accepts buffered high-impedance signals (e.g., from THS4031 PGA). |
| AINM | Analog Input | Differential negative ADC input; referenced to AGND for single-ended or pseudo-differential operation. |
| MXO | Analog Output | Multiplexer output node - connects internal channel selection to ADC core; requires external buffer if driving long traces. |
| Ch0–Ch7 | Analog Input | Eight single-ended analog input channels; each routed to multiplexer under GPIO or auto-sequence control. |
| CS | Digital Input | Active-low chip select - initiates conversion on falling edge and enables serial interface; must be held low during SCLK activity. |
| SCLK | Digital Input | Serial clock input - controls conversion timing, data latching, and bit transfer; supports up to 20 MHz for minimal frame time. |
| SDI/SDO | Digital I/O | Shared bidirectional SPI port - SDI receives configuration commands (e.g., range, alarm setpoints); SDO outputs conversion results. |
| GPIO0–GPIO3 | Digital I/O | Four programmable pins - configured as alarm outputs (high/low), range select (GPIO2), or power-down trigger (GPIO3, active low). |
| REFP/REFM | Analog Input | Reference voltage terminals - accept external 2.5-V reference (e.g., REF5025) with 10-µF decoupling for <0.1% full-scale error. |
| +VA/AGND | Power/Ground | Analog supply and ground - separate from digital domain to minimize noise coupling into sensitive SAR conversion path. |
| +VBD/BDGND | Power/Ground | Digital I/O supply and ground - independently biased to match host processor voltage, enabling mixed-voltage system integration. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-latency conversion | Delivers first valid result within one SCLK cycle after CS assertion - eliminates pipeline delay in real-time feedback loops. |
| Per-channel alarm thresholds | Independent high/low limits programmable via SPI - enables autonomous overvoltage/undervoltage detection per sensor input without firmware overhead. |
| Auto/manual channel sequencing | Hardware-controlled scan (auto) or host-directed selection (manual) - supports both fixed monitoring and adaptive acquisition strategies. |
| 4-GPIO flexibility in TSSOP | GPIO0–GPIO3 support alarm outputs, range selection, and power-down - reduces external logic in compact I/O module designs. |
| 20-MHz serial interface | Enables 16-bit readout in ≤800 ns - meets tight timing budgets in high-throughput data loggers and motion controllers. |
Applications
| PLC Analog Input Module | Optical Line Card Monitoring |
|---|---|
|
Use Scenario: Simultaneous acquisition of 8 voltage/current sensor outputs in modular industrial controllers. IC Role / Device Role / Timing Role: Primary ADC front-end with integrated multiplexer and alarm generation - replaces discrete mux + ADC + comparator combinations. Use Value: Reduces BOM count by 3+ components per channel and cuts conversion latency to <1 µs, improving loop response in servo drives. |
Use Scenario: Real-time bias current and photodiode voltage monitoring across multiple transceivers in telecom line cards. IC Role / Device Role / Timing Role: High-speed, multi-channel analog monitor with hardware alarms - triggers optical power adjustment before BER degradation occurs. Use Value: Enables sub-millisecond fault response using GPIO-driven interrupts, avoiding software polling delays that risk link failure. |
| Medical Patient Monitor Front-End | Digital Power Supply Telemetry |
|
Use Scenario: Acquisition of ECG, respiration, and temperature signals in portable diagnostic devices. IC Role / Device Role / Timing Role: Low-power, precision ADC with programmable input range - adapts to varying sensor sensitivities (mV to V scale) without external gain switches. Use Value: Achieves 12-bit ENOB at 1 MSPS with only 14.5 mW, extending battery life in Class II medical equipment. |
Use Scenario: Monitoring rail voltages, phase currents, and thermal sensors in digitally controlled AC/DC and DC/DC converters. IC Role / Device Role / Timing Role: Telemetry ADC with alarm-triggered shutdown - detects overcurrent events faster than PWM controller response time. Use Value: Prevents MOSFET failure by asserting hardware alarm within 1 µs of threshold breach, independent of firmware execution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7952SBDBT | 12-bit, 12-channel variant in same 30-pin TSSOP package - identical pinout and interface but adds Ch8–Ch11. | Requires no PCB change; suitable when future expansion to 12 channels is planned or existing layout has unused channel routing. | Select ADS7952SBDBT only if >8 channels are needed - same cost and footprint, but higher channel count increases idle power slightly. |
| ADS8684IPWR | 16-bit, 4-channel SAR ADC with integrated reference and true bipolar input (±10 V) - uses different SPI framing and lacks per-channel alarms. | Demands PCB redesign (20-pin TSSOP vs. 30-pin) and firmware adaptation; preferred where resolution >12-bit is mandatory. | Choose ADS8684IPWR for metrology-grade accuracy; avoid if alarm autonomy or 8-channel density is required. |
Compared with ADS7952SBDBT, ADS7951SBDBTR trades 4 channels for lower channel-to-channel crosstalk and reduced digital switching noise in 8-signal systems; versus ADS8684IPWR, it offers superior real-time responsiveness via hardware alarms and seamless integration into existing 30-pin TSSOP layouts.
Availability
ADS7951SBDBTR is available at Aetrix Electronics and suitable for PLC/IPC analog I/O modules, optical line card telemetry, and medical instrumentation requiring stable component supply and long-term production continuity.
Supply support for ADS7951SBDBTR 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-speed, multi-channel data acquisition in programmable logic controllers, test equipment, and real-time monitoring systems - emphasizing zero-latency conversion, flexible input scaling, and hardware-based alarm response.
FAQ
What is the maximum supported SCLK frequency for ADS7951SBDBTR?
The ADS7951SBDBTR supports up to 20 MHz SCLK frequency, enabling full 16-bit serial readout in ≤800 ns. This timing is validated across the full operating temperature range (–40°C to +125°C) and ensures reliable communication with high-speed microcontrollers and FPGAs without setup/hold violations.
Does ADS7951SBDBTR require an external reference voltage?
Yes, ADS7951SBDBTR requires an external reference applied to REFP/REFM pins. The device is optimized for 2.5-V references like the REF5025, with specified performance at VREF = 2.5 V ± 0.1 V. Internal reference is not provided - this design enables system-level reference sharing and improved PSRR.
How many analog input channels does ADS7951SBDBTR support?
ADS7951SBDBTR supports eight single-ended analog input channels (Ch0–Ch7), as confirmed by the device comparison table and pin functions in SLAS605C. These are accessible via the internal multiplexer, with MXO providing the selected channel's output to the ADC core.
Can ADS7951SBDBTR operate with separate analog and digital supplies?
Yes, ADS7951SBDBTR uses independent analog (+VA/AGND) and digital I/O (+VBD/BDGND) supplies. This separation minimizes digital switching noise coupling into the SAR conversion path, preserving SNR and enabling robust operation in mixed-signal environments such as motor drives and power supplies.
What GPIO functionality is available on ADS7951SBDBTR?
ADS7951SBDBTR provides four GPIOs (GPIO0–GPIO3) in its 30-pin TSSOP package. GPIO2 selects input range (0 → 0 to VREF, 1 → 0 to 2×VREF); GPIO3 is active-low power-down; GPIO0/GPIO1 serve as programmable alarm outputs (high/low); all are configurable via SPI register writes.
ADS7951SBDBTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- microPOWER™
- Package/Case:
- 30-TFSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 1M
- Number of Inputs:
- 8
- 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:
- -
ADS7951SBDBTR FAQ
1.How can I place an order for ADS7951SBDBTR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7951SBDBTR 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 ADS7951SBDBTR reliable?
The price and inventory of ADS7951SBDBTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7951SBDBTR is usually 5 days.
3.What payment methods are accepted for ADS7951SBDBTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7951SBDBTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7951SBDBTR?
ADS7951SBDBTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7951SBDBTR 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 ADS7951SBDBTR?
For technical support, including ADS7951SBDBTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7951SBDBTR requirements.
6.How does Aetrix verify that ADS7951SBDBTR is sourced from the original manufacturer or authorized distributors?
All ADS7951SBDBTR 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 ADS7951SBDBTR meets industry standards.
7.What is the process for return or replacement of ADS7951SBDBTR?
All ADS7951SBDBTR units undergo pre-shipment inspection (PSI). If there is an issue with ADS7951SBDBTR, 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 ADS7951SBDBTR part is unused and in its original packaging.
Return procedure for ADS7951SBDBTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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