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Texas Instruments ADS7951SDBT
- Part No.:
- ADS7951SDBT
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 30-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADS7951SDBT.pdf
- Description:
- IC ADC 12BIT SAR 30TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,450
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Product details
Overview
ADS7951SDBT 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 20-MHz SPI-compatible serial interface. It features two software-selectable unipolar input ranges (0 to VREF and 0 to 2×VREF), four programmable GPIOs, and dual per-channel alarm thresholds - deployed in industrial PLC signal monitoring and digital power supply feedback loops.
For engineers reviewing the ADS7951SDBT datasheet, ADS7951SDBT pinout, ADS7951SDBT application, or ADS7951SDBT equivalent, key selection criteria include channel count vs. resolution trade-offs, GPIO configurability for alarm signaling, TSSOP-30 package compatibility with legacy layouts, and support for glueless interfacing to microcontrollers via CS/SCLK/SDO/SDI.
Technical Context
The ADS7951SDBT implements a capacitor-based SAR architecture with integrated sample-and-hold, accepting analog supplies from 2.7 V to 5.25 V and I/O supplies from 1.7 V to 5.25 V. Its input bandwidth is 47 MHz (3 dB), enabling accurate digitization of fast transients in closed-loop control systems.
It supports both auto-sequencing across preselected channels and manual channel selection per conversion cycle. The device uses the falling edge of CS to initiate sampling and SCLK for conversion timing, serial data output, and command input - ensuring deterministic latency and synchronization with host processors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit SAR ADC - delivers 1024 discrete output codes with ±0.99 LSB differential linearity for precise amplitude quantization. |
| Sample Rate | 1 MSPS maximum - supports real-time capture of signals up to ~400 kHz (Nyquist-limited) in high-speed data acquisition. |
| Input Channels | 8 single-ended analog inputs (Ch0–Ch7) - enables compact multi-sensor monitoring without external multiplexers. |
| Input Ranges | 0 to VREF or 0 to 2×VREF (SW-selectable) - accommodates both standard 2.5-V reference and extended dynamic range with 5-V full-scale. |
| Power Dissipation | 14.5 mW at 1 MSPS (+VA = 5 V, +VBD = 3 V) - suitable for thermally constrained industrial modules and isolated power domains. |
| Power-Down Current | 1 µA - reduces system standby power significantly during idle periods in battery-backed or energy-sensitive applications. |
| Serial Interface | 20-MHz SPI-compatible (CS, SCLK, SDI, SDO) - ensures low-pin-count, high-throughput communication with minimal FPGA or MCU resource usage. |
Pinout & Package
ADS7951SDBT 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 continuous high-sample-rate operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Ch0–Ch7 | Analog input | Eight single-ended analog signal inputs routed to internal multiplexer; Ch0 maps to pin 20, Ch7 to pin 21 in DBT package. |
| AINP / AINM | Differential analog input pair | Optional pseudo-differential mode using AINP as signal and AINM as reference; supports high-impedance sensor interfaces. |
| MXO | Analog output | Multiplexer output - provides buffered access to selected channel's analog signal before ADC conversion. |
| REFP / REFM | Analog reference | High-precision reference input (REFP) and reference ground (REFM); accepts external REF5025 or similar 2.5-V reference. |
| CS / SCLK / SDI / SDO | Digital control & data | Standard SPI interface: active-low chip select, 20-MHz clock, command/data in, and conversion result out - no framing overhead. |
| GPIO0–GPIO3 | Programmable I/O | Four bidirectional pins configurable as alarm outputs (high/low), range select, or power-down trigger - eliminates need for external logic. |
| +VA / AGND | Analog supply | 2.7–5.25 V analog rail with dedicated ground plane - critical for maintaining SNR > 60 dB and THD < –70 dB. |
| +VBD / BDGND | Digital I/O supply | 1.7–5.25 V flexible IO voltage - enables direct connection to 1.8-V, 3.3-V, or 5-V microcontrollers without level shifters. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-latency conversion | Eliminates pipeline delay - essential for real-time closed-loop control where output must respond within one sample period. |
| Per-channel programmable alarms | Two independent threshold registers per channel generate active-high GPIO alarm signals - enables autonomous overvoltage/undervoltage detection. |
| Auto-sequencing mode | Configurable scan list (e.g., Ch0→Ch3→Ch7) executed autonomously - reduces host CPU load in multi-channel monitoring. |
| Wide analog input bandwidth | 47 MHz (3 dB) - preserves fidelity of fast-rising pulses and switching noise in power electronics monitoring. |
| Glueless microcontroller interface | Native SPI timing compliance with no additional protocol translation - simplifies firmware integration and validation. |
Applications
| PLC Analog Input Module | Digital Power Supply Monitoring |
|---|---|
|
Use Scenario: Simultaneous voltage/current sensing across eight rails in modular programmable logic controller backplanes. IC Role / Device Role / Timing Role: Primary ADC for analog input cards, performing synchronized sampling under host-configured auto-sequence mode. Use Value: 1-MSPS throughput enables sub-millisecond update rates across all 8 channels, meeting IEC 61131-3 cycle time requirements. |
Use Scenario: Real-time feedback of output voltage, inductor current, and temperature in digitally controlled DC-DC converters. IC Role / Device Role / Timing Role: High-fidelity signal digitizer feeding PID loop calculations in FPGA or ARM-based power management ICs. Use Value: Zero-latency operation ensures immediate correction response to load transients, improving regulation accuracy by >15% vs. pipelined ADCs. |
| Optical Line Card Health Monitoring | Medical Patient Parameter Acquisition |
|
Use Scenario: Monitoring bias currents, photodiode outputs, and thermistor readings across multiple optical transceivers in telecom line cards. IC Role / Device Role / Timing Role: Multi-channel front-end ADC with GPIO-driven alarm outputs flagging out-of-spec laser driver conditions. Use Value: Dual per-channel alarms reduce host polling frequency by 80%, lowering system-level interrupt load and firmware complexity. |
Use Scenario: Digitizing ECG leads, respiration sensors, and temperature probes in portable patient monitors. IC Role / Device Role / Timing Role: Low-power, high-accuracy ADC operating from isolated 3.3-V supply with on-demand wake-up via GPIO0. Use Value: 1 µA power-down current extends battery life beyond 72 hours in standby mode while retaining fast (<1 µs) wake-up capability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7953SDBT | 12-bit resolution, 16-channel, same 30-pin TSSOP footprint - higher precision but lower channel density per package area. | Better suited for high-accuracy sensor fusion (e.g., strain gauge arrays) where 12-bit ENOB justifies added cost. | Select ADS7953SDBT when system SNR requirement exceeds 68 dB and channel count can be reduced to 16. |
| ADS7950SDBT | 12-bit resolution, 4-channel, identical TSSOP-30 package - trades channel count for resolution and lower input capacitance (10 pF vs. 15 pF). | Ideal for precision single-rail monitoring (e.g., reference voltage validation) where fewer inputs simplify layout and filtering. | Choose ADS7950SDBT when design prioritizes measurement accuracy over channel count and board space is not constrained. |
Compared with ADS7951SDBT, ADS7953SDBT offers higher resolution at the expense of channel count, while ADS7950SDBT delivers best-in-class 12-bit linearity in a minimal 4-channel configuration - making ADS7951SDBT the optimal balance of speed, resolution, and density for general-purpose industrial monitoring.
Availability
ADS7951SDBT is available at Aetrix Electronics and suitable for PLC/IPC analog input modules, digital power supply feedback systems, and optical line card health monitoring requiring stable component supply and long-term production continuity.
Supply support for ADS7951SDBT 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 signal chain solutions.
The ADS79xx family was designed specifically for high-speed, multi-channel industrial data acquisition - emphasizing zero-latency operation, flexible GPIO integration, and robust performance across wide supply and temperature ranges.
FAQ
What is the maximum sample rate supported by the ADS7951SDBT?
The ADS7951SDBT supports a maximum sample rate of 1 million samples per second (1 MSPS). This rate is achievable across all 8 channels in auto-sequencing mode with guaranteed timing compliance per the SLAS605C datasheet. At this rate, the ADS7951SDBT maintains 10-bit effective resolution and meets its specified differential nonlinearity of ±0.99 LSB.
Does the ADS7951SDBT require an external reference voltage?
Yes, the ADS7951SDBT requires an external reference voltage applied to the REFP pin, with REFM tied to analog ground. The device supports two input ranges: 0 to VREF and 0 to 2×VREF, selectable via GPIO2. A precision 2.5-V reference such as the REF5025 is recommended to achieve full 10-bit accuracy and minimize total unadjusted error.
How many GPIOs does the ADS7951SDBT provide, and what functions do they support?
The ADS7951SDBT provides four individually configurable GPIOs (GPIO0–GPIO3) in its 30-pin TSSOP package. These pins support programmable functions including high/low alarm outputs, input range selection (GPIO2), and active-low power-down control (GPIO3). Their dual-role capability is configured via internal registers accessible through the SPI interface.
Is the ADS7951SDBT pin-compatible with other devices in the ADS79xx family?
Yes, the ADS7951SDBT shares the same 30-pin TSSOP (DBT) footprint with ADS7950SDBT, ADS7954SDBT, and ADS7958SDBT. Pin assignments for power, reference, analog inputs, and SPI signals are identical across these variants, enabling hardware reuse when scaling resolution or channel count within the same PCB layout.
What is the power consumption of the ADS7951SDBT during active conversion?
The ADS7951SDBT consumes 14.5 mW typical power at 1 MSPS with +VA = 5 V and +VBD = 3 V. This includes analog circuitry, digital interface, and internal logic. In power-down mode, quiescent current drops to 1 µA, making it suitable for intermittent-sampling applications where energy efficiency is critical.
ADS7951SDBT 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:
- -
ADS7951SDBT FAQ
1.How can I place an order for ADS7951SDBT through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7951SDBT 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 ADS7951SDBT reliable?
The price and inventory of ADS7951SDBT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7951SDBT is usually 5 days.
3.What payment methods are accepted for ADS7951SDBT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7951SDBT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7951SDBT?
ADS7951SDBT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7951SDBT 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 ADS7951SDBT?
For technical support, including ADS7951SDBT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7951SDBT requirements.
6.How does Aetrix verify that ADS7951SDBT is sourced from the original manufacturer or authorized distributors?
All ADS7951SDBT 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 ADS7951SDBT meets industry standards.
7.What is the process for return or replacement of ADS7951SDBT?
All ADS7951SDBT units undergo pre-shipment inspection (PSI). If there is an issue with ADS7951SDBT, 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 ADS7951SDBT part is unused and in its original packaging.
Return procedure for ADS7951SDBT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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