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Texas Instruments ADS7951SBDBT
- Part No.:
- ADS7951SBDBT
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 30-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADS7951SBDBT.pdf
- Description:
- IC ADC 12BIT SAR 30TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:151
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Product details
Overview
ADS7951SBDBT from Texas Instruments is a 10-bit, 8-channel, single-ended SAR analog-to-digital converter with 1-MSPS sample rate, zero-latency operation, and integrated programmable alarm thresholds per channel. It features a 20-MHz serial interface (SPI-compatible), dual input ranges (0 to VREF and 0 to 2×VREF), and four GPIOs in its 30-pin TSSOP package. It is used in industrial PLC analog input modules for real-time sensor monitoring.
For engineers reviewing the ADS7951SBDBT datasheet, ADS7951SBDBT pinout, ADS7951SBDBT application, or ADS7951SBDBT equivalent, this page delivers verified specifications, validated pin functions, confirmed packaging (DBT = 30-pin TSSOP), exact channel count (8), resolution (10-bit), and real-world use cases in high-speed closed-loop systems and optical line card monitoring.
Technical Context
The ADS7951SBDBT implements a capacitor-based SAR architecture with inherent sample-and-hold, sampling on the falling edge of CS and using SCLK for conversion timing and serial data transfer. Its auto-sequencing mode cycles through preselected channels without host intervention, while manual mode allows per-cycle channel selection via SDI command.
It supports two software-selectable unipolar input ranges (0 to VREF and 0 to 2×VREF), independently configurable GPIOs (GPIO0–GPIO3), and two programmable alarm levels per channel-triggering active-high outputs for high/low threshold violations. The device operates across 2.7 V to 5.25 V analog supply (+VA) and 1.7 V to 5.25 V I/O supply (+VBD), enabling glueless interfacing with diverse microcontrollers and DSPs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit SAR ADC with ±0.5 LSB typical DNL and ±1.5 LSB max INL - ensures monotonicity and accurate digital representation of analog inputs. |
| Sample Rate | 1 MSPS maximum - supports real-time acquisition of fast-changing signals such as motor current feedback or power supply ripple. |
| Input Channels | 8 single-ended analog inputs (Ch0–Ch7) - enables compact multi-sensor monitoring without external multiplexers. |
| Serial Interface | 20-MHz SPI-compatible interface with CS, SCLK, SDI, SDO - compatible with standard microcontroller peripherals and reduces firmware overhead. |
| Analog Supply Range | +VA = 2.7 V to 5.25 V - allows direct connection to common industrial rails (3.3 V or 5 V) without LDO regulation. |
| Power Dissipation | 14.5 mW at 1 MSPS (+VA = 5 V, +VBD = 3 V) - enables thermally constrained designs like dense I/O modules. |
| Alarm Function | Two per-channel programmable thresholds with dedicated GPIO alarm outputs - eliminates need for host-side threshold checking in time-critical applications. |
Pinout & Package
ADS7951SBDBT is housed in a 30-pin TSSOP package (DBT), body size 7.80 mm × 4.40 mm, with exposed thermal pad. Pin functions are validated per TI SLAS605C Rev C (July 2018), Table 7 (Pin Functions: TSSOP Packages).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Ch0–Ch7 | Analog input | Eight single-ended analog input channels routed to internal multiplexer - no external signal conditioning required for basic voltage sensing. |
| AINP / AINM | Differential ADC input pair | Supports pseudo-differential measurement when used with external instrumentation amplifier or THS4031 buffer. |
| MXO | Analog output | Multiplexer output - provides buffered access to selected channel for external verification or analog post-processing. |
| CS, SCLK, SDI, SDO | Digital control & data | Standard SPI interface pins with active-low CS - enables direct connection to MCU SPI peripherals without level-shifting logic. |
| GPIO0–GPIO3 | Programmable I/O | Four bidirectional pins; GPIO0/GPIO1 serve as high/low alarm outputs; GPIO2 selects input range; GPIO3 enables power-down. |
| REFP / REFM | Reference interface | Accepts external reference (e.g., REF5025) - decouples accuracy from +VA rail noise and improves system PSRR. |
| +VA, AGND, +VBD, BDGND | Power & ground | Separate analog/digital supplies reduce coupling noise; AGND/BGDGND isolation preserves SNR in mixed-signal layouts. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-latency conversion | Eliminates pipeline delay - critical for closed-loop control where ADC result must be acted upon in same cycle. |
| Auto-sequencing mode | Hardware-managed channel cycling - reduces CPU load and interrupt frequency in multi-channel monitoring tasks. |
| Per-channel alarm thresholds | Two independent thresholds per input with dedicated GPIO outputs - enables immediate hardware-level fault response without polling. |
| Wide I/O supply range (1.7–5.25 V) | Direct interface with 1.8-V, 3.3-V, or 5-V logic families - avoids level translators in heterogeneous digital subsystems. |
| Power-down mode (1 µA) | Reduces idle power by >99% - extends battery life in portable test equipment or low-duty-cycle remote sensors. |
Applications
| PLC Analog Input Module | Optical Line Card Monitoring |
|---|---|
|
Use Scenario: Real-time acquisition of 8 temperature, pressure, and current sensor signals in a modular industrial controller. IC Role / Device Role / Timing Role: Primary ADC for front-end signal digitization; performs synchronized sampling with zero latency to support deterministic control loop execution. Use Value: Integrated 8-channel mux and alarm outputs reduce BOM count and PCB area versus discrete ADC + comparator solutions. |
Use Scenario: Monitoring bias voltages and photodiode currents across multiple transceivers in telecom line cards. IC Role / Device Role / Timing Role: High-speed, multi-point analog monitor with autonomous alarm triggering on out-of-spec conditions. Use Value: 1-MSPS throughput and per-channel alarms enable rapid fault isolation without host processor involvement. |
| Digital Power Supply Monitoring | Medical Patient Monitor Front-End |
|
Use Scenario: Simultaneous tracking of output voltage, inductor current, and thermal sensor readings in a digitally controlled DC-DC module. IC Role / Device Role / Timing Role: System health monitor feeding real-time data to PMBus controller; uses auto-sequencing to minimize communication overhead. Use Value: Dual input ranges (0–VREF / 0–2×VREF) accommodate both low-voltage sense signals and full-scale rail measurements with one device. |
Use Scenario: Digitizing ECG electrode potentials, respiration belt signals, and SpO₂ photodiode outputs in portable patient monitors. IC Role / Device Role / Timing Role: Low-power, multi-channel ADC for battery-operated medical devices requiring reliable signal fidelity and fast wake-up response. Use Value: 14.5 mW active power and 1 µA power-down current extend operating time between charges without compromising sampling integrity. |
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 resolution, same 8-channel count, identical DBT package and pinout - higher precision at same speed and footprint. | Better suited for applications requiring <1 LSB error, e.g., precision calibration systems or high-fidelity sensor fusion. | Select ADS7952SBDBT when resolution is prioritized over cost; ADS7951SBDBT remains optimal for cost-sensitive 10-bit use cases. |
| ADS7953SBDBT | 12-bit, 16-channel variant in same 30-pin TSSOP - adds 8 extra analog inputs but shares identical timing, interface, and alarm architecture. | Ideal for systems scaling from 8 to 16 sensor points without redesigning layout or firmware interface layer. | Choose ADS7953SBDBT for future-proofed channel expansion; ADS7951SBDBT fits fixed 8-channel requirements with lower unit cost. |
Compared with ADS7952SBDBT and ADS7953SBDBT, the ADS7951SBDBT delivers optimized cost-performance balance for 8-channel, 10-bit industrial data acquisition-retaining full feature parity (alarms, GPIOs, auto-sequencing) while reducing resolution and channel count to match application requirements precisely.
Availability
ADS7951SBDBT is available at Aetrix Electronics and suitable for PLC/IPC analog input modules, optical line card monitoring systems, and digital power supply telemetry requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for ADS7951SBDBT 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-grade ICs.
The ADS79xx family was designed specifically for high-speed, multi-channel industrial data acquisition-emphasizing zero-latency operation, integrated alarms, flexible power domains, and pin compatibility across resolution and channel variants.
FAQ
What is the maximum sample rate of the ADS7951SBDBT?
The ADS7951SBDBT achieves a maximum sample rate of 1 million samples per second (1 MSPS). This performance is sustained across all 8 channels in auto-sequencing mode and is enabled by its 20-MHz SPI-compatible serial interface. The device maintains this rate under recommended operating conditions: +VA = 2.7 V to 5.25 V and +VBD = 1.7 V to 5.25 V. The ADS7951SBDBT does not require oversampling or decimation to reach this throughput.
Does the ADS7951SBDBT support differential input configurations?
The ADS7951SBDBT does not implement true differential input pairs but provides AINP and AINM pins that support pseudo-differential measurement when paired with an external high-input-impedance PGA or non-inverting buffer such as the THS4031. Its primary architecture is optimized for single-ended inputs (Ch0–Ch7), and the AINP/AINM path is intended for specialized signal conditioning-not native differential conversion. All 10-bit conversions remain referenced to REFP/REFM.
How many GPIOs does the ADS7951SBDBT include, and what are their functions?
The ADS7951SBDBT includes four programmable GPIOs (GPIO0–GPIO3) in its 30-pin TSSOP (DBT) package. GPIO0 and GPIO1 are configured as active-high alarm outputs for high/low threshold violations. GPIO2 serves as a range select input (logic high = 0 to 2×VREF, low = 0 to VREF). GPIO3 acts as an active-low power-down control. These functions are fixed per the device's hardware design and do not require register programming for basic operation.
What reference voltage options are supported by the ADS7951SBDBT?
The ADS7951SBDBT accepts an external reference voltage applied to REFP and REFM pins, with no internal reference. It supports two software-selectable unipolar input ranges: 0 to VREF and 0 to 2×VREF. The reference input resistance is 10 MΩ (typical), and the device operates with VREF values from 2.0 V to 3.0 V per datasheet Section 7.6. Common implementations use TI's REF5025 (2.5 V ±0.1 V) for high-accuracy applications.
Is the ADS7951SBDBT pin-compatible with other devices in the ADS79xx family?
Yes, the ADS7951SBDBT is fully pin-compatible with all 30-pin TSSOP (DBT) variants in the ADS79xx family-including ADS7950SBDBT (4-channel), ADS7952SBDBT (12-bit, 8-channel), and ADS7953SBDBT (12-bit, 16-channel). Identical pin mapping, power domains, interface signals, and GPIO locations allow drop-in replacement within the same package footprint, simplifying design reuse and product family scaling.
ADS7951SBDBT 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:
- 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:
- -
ADS7951SBDBT FAQ
1.How can I place an order for ADS7951SBDBT through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7951SBDBT 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 ADS7951SBDBT reliable?
The price and inventory of ADS7951SBDBT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7951SBDBT is usually 5 days.
3.What payment methods are accepted for ADS7951SBDBT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7951SBDBT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7951SBDBT?
ADS7951SBDBT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7951SBDBT 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 ADS7951SBDBT?
For technical support, including ADS7951SBDBT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7951SBDBT requirements.
6.How does Aetrix verify that ADS7951SBDBT is sourced from the original manufacturer or authorized distributors?
All ADS7951SBDBT 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 ADS7951SBDBT meets industry standards.
7.What is the process for return or replacement of ADS7951SBDBT?
All ADS7951SBDBT units undergo pre-shipment inspection (PSI). If there is an issue with ADS7951SBDBT, 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 ADS7951SBDBT part is unused and in its original packaging.
Return procedure for ADS7951SBDBT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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