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Texas Instruments ADS7951SBRGER
- Part No.:
- ADS7951SBRGER
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
ADS7951SBRGER.pdf
- Description:
- IC ADC 12BIT SAR 24VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,577
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Product details
Overview
ADS7951SBRGER from Texas Instruments is a 10-bit, 8-channel, single-ended SAR analog-to-digital converter with 1-MSPS sampling 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 four GPIOs in TSSOP packaging - used in PLC analog input modules for real-time sensor monitoring.
For engineers reviewing the ADS7951SBRGER datasheet, ADS7951SBRGER pinout, ADS7951SBRGER application, or ADS7951SBRGER equivalent, key selection criteria include channel count (8), resolution (10-bit), serial interface timing (20-MHz SCLK), alarm threshold configurability, and TSSOP-30 package compatibility with industrial signal acquisition layouts.
Technical Context
The ADS7951SBRGER implements a capacitor-based SAR architecture with integrated sample-and-hold, enabling zero-latency conversion essential for closed-loop control. Its analog front-end accepts 2.7–5.25 V supply and supports flexible reference configurations via REFP/REFM pins.
Serial communication uses CS (active-low chip select), SCLK, SDI, and SDO signals with falling-edge CS sampling and SCLK-synchronized data transfer. Channel selection operates in auto-sequencing or manual mode, with GPIO0–GPIO3 supporting alarm outputs (high/low) and range/power-down control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1024 discrete output codes for medium-precision industrial sensing |
| Sampling Rate | 1 MSPS - supports real-time capture of fast transients in motor control feedback loops |
| Input Channels | 8 single-ended - enables compact multi-sensor monitoring without external multiplexing |
| Input Ranges | 0 to VREF or 0 to 2×VREF - selectable per system gain requirements using GPIO2 (Range pin) |
| Power Dissipation | 14.5 mW at 1 MSPS (+VA = 5 V, +VBD = 3 V) - suitable for thermally constrained industrial enclosures |
| Alarm Functionality | Two programmable thresholds per channel - enables autonomous over/under-limit detection without host intervention |
| Interface Speed | 20-MHz SCLK - allows full 10-bit conversion and readout within ≤500 ns, minimizing bus occupancy |
Pinout & Package
The ADS7951SBRGER is packaged in a 30-pin TSSOP (DBT) with 7.80 mm × 4.40 mm body size, compatible with standard surface-mount reflow processes and IPC-7351B land patterns.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH3 | Analog input | Four dedicated single-ended analog inputs mapped to multiplexer channels 0–3 |
| MXO | Analog output | Multiplexer output - connects to AINP for selected channel's signal path |
| AINP / AINM | Analog input | Differential input pair accepting buffered/unbuffered signals; AINM tied to AGND for single-ended use |
| CS, SCLK, SDI, SDO | Digital I/O | SPI-compatible control and data interface; CS active-low enables synchronous sampling on its falling edge |
| GPIO0–GPIO3 | Digital I/O | Configurable as alarm outputs (high/low), range select (GPIO2), or power-down trigger (GPIO3) |
| REFP / REFM | Analog reference | High-impedance reference input and ground - accepts external REF5025 or similar precision voltage source |
| +VA / AGND | Analog supply | 2.7–5.25 V analog rail; AGND must be star-connected to minimize noise coupling into ADC core |
| +VBD / BDGND | Digital supply | 1.7–5.25 V I/O rail - decoupled separately from +VA to prevent digital switching noise from modulating conversion accuracy |
Key Features
| Feature | Design Value |
|---|---|
| Zero-latency conversion | Eliminates pipeline delay - critical for servo position feedback where timing determinism affects stability margins |
| Per-channel alarm thresholds | Reduces host CPU load by offloading limit-check logic to hardware; configurable via serial register writes |
| Auto/manual channel sequencing | Enables deterministic scan order (auto) or on-demand sampling (manual) - adaptable to varying sensor update rates |
| Wide analog/digital supply ranges | Supports mixed-voltage systems: +VA can run at 3.3 V while +VBD interfaces directly with 1.8-V microcontrollers |
| Power-down mode (1 µA) | Extends battery life in portable test equipment; exit time <1 µs ensures rapid resumption of acquisition |
Applications
| PLC Analog Input Module | Optical Line Card Monitoring |
|---|---|
Use Scenario: Simultaneous acquisition of 8 temperature, pressure, and current sensors in a DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: Primary ADC performing synchronized sampling and alarm-triggered interrupt generation for fieldbus communication. Use Value: 1-MSPS throughput and zero latency ensure cycle-consistent data for motion control algorithms without jitter-induced position error. | Use Scenario: Real-time monitoring of laser diode bias current, TEC voltage, and photodiode output across multiple optical transceivers. IC Role / Device Role / Timing Role: Multi-channel front-end digitizer interfacing with FPGA-based telemetry engine via SPI. Use Value: Dual input ranges allow direct measurement of both low-level photodiode signals (0–2.5 V) and high-voltage TEC supplies (0–5 V) without external scaling. |
| Medical Patient Monitor | Digital Power Supply Telemetry |
Use Scenario: Acquisition of ECG leads, respiration impedance, SpO₂ photodiode outputs, and temperature in portable bedside monitor. IC Role / Device Role / Timing Role: Low-power ADC managing sensor polling during sleep mode and burst sampling during alarm events. Use Value: 14.5 mW active power and 1 µA power-down current extend battery runtime while maintaining clinical-grade signal fidelity. | Use Scenario: In-system monitoring of output voltage, inductor current, and thermal sensors in isolated DC-DC converters for telecom infrastructure. IC Role / Device Role / Timing Role: Isolated-side ADC feeding telemetry data to digital controller via optocoupled SPI link. Use Value: High input bandwidth (47 MHz at 3 dB) preserves fast transient response of current-sense waveforms for adaptive loop compensation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7953SBRGER | 12-bit resolution, 16-channel configuration - higher precision but lower channel density per package | Used where SNR > 70 dB required (e.g., high-fidelity medical imaging front-end) | Select when absolute accuracy outweighs channel count; requires updated firmware for 12-bit data handling |
| ADS7950SBRGER | 4-channel variant in same 30-pin TSSOP footprint - identical timing, registers, and GPIO functionality | Preferred for cost-sensitive designs with ≤4 sensor inputs (e.g., basic HVAC controllers) | Drop-in replacement if channel count reduction is acceptable; no PCB changes required |
Compared with ADS7951SBRGER, ADS7953SBRGER trades channel count for resolution and dynamic range, while ADS7950SBRGER retains full compatibility at reduced channel density - enabling scalable BOM management across product tiers.
Availability
ADS7951SBRGER is available at Aetrix Electronics and suitable for PLC/IPC systems, optical line card monitoring, and medical instrumentation requiring stable component supply, long-term manufacturability, and TI-qualified industrial-grade performance.
Supply support for ADS7951SBRGER 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 automation controllers, optical networking equipment, and portable medical devices - emphasizing zero-latency operation, flexible alarm logic, and wide supply voltage tolerance.
FAQ
What is the maximum sampling rate supported by the ADS7951SBRGER?
The ADS7951SBRGER supports a maximum sampling rate of 1 MSPS (1 million samples per second). This rate is achievable under recommended operating conditions, including +VA = 5 V and SCLK ≤ 20 MHz. At this speed, the device maintains specified integral nonlinearity (INL) and signal-to-noise ratio (SNR) performance per the SLAS605C datasheet. The ADS7951SBRGER achieves this throughput using a capacitor-based SAR architecture with inherent sample-and-hold, eliminating pipeline delay.
Does the ADS7951SBRGER require an external reference voltage?
Yes, the ADS7951SBRGER requires an external reference voltage applied to the REFP pin, with REFM connected to analog ground. The device supports two input ranges: 0 to VREF and 0 to 2×VREF, selected via GPIO2. A precision reference such as the REF5025 (2.5 V ±0.1 V) is recommended to meet total unadjusted error (TUE) specifications. The ADS7951SBRGER does not include an internal reference; reference input resistance is 10 GΩ typical, minimizing loading effects.
How many GPIOs are available on the ADS7951SBRGER, and what functions do they serve?
The ADS7951SBRGER provides four GPIOs (GPIO0–GPIO3) in its 30-pin TSSOP package. GPIO0 and GPIO1 serve as active-high alarm outputs (high-alarm and low-alarm); GPIO2 selects input range (high = 0 to 2×VREF, low = 0 to VREF); GPIO3 is an active-low power-down input. All GPIOs are programmable through serial interface registers. The ADS7951SBRGER does not support GPIO direction reversal beyond these defined alarm/control roles per the device functional modes section of SLAS605C.
Is the ADS7951SBRGER pin-compatible with other devices in the ADS79xx family?
Yes, the ADS7951SBRGER is pin-compatible with all 30-pin TSSOP variants in the ADS79xx family, including ADS7950SBRGER (4-channel), ADS7952SBRGER (12-channel), and ADS7953SBRGER (16-channel). Pin assignments for power, interface, reference, and GPIOs are identical; only analog input pin counts differ (CH0–CH3 for ADS7951SBRGER). This allows shared PCB layout across resolution/channel variants, reducing design reuse effort. The ADS7951SBRGER shares the same DBT package footprint and thermal characteristics as its siblings.
What are the power supply requirements for the ADS7951SBRGER?
The ADS7951SBRGER requires two independent supplies: +VA (analog, 2.7–5.25 V) and +VBD (digital I/O, 1.7–5.25 V). AGND and BDGND must be separated and connected at a single point to minimize noise coupling. Typical power dissipation is 14.5 mW at 1 MSPS with +VA = 5 V and +VBD = 3 V; power-down current is 1 µA. The ADS7951SBRGER specifies thermal resistance θJA = 100°C/W for the TSSOP package, requiring appropriate copper area for industrial ambient temperatures up to +85°C.
ADS7951SBRGER Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- microPOWER™
- Package/Case:
- 24-VFQFN Exposed Pad
- 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:
- 24-VQFN (4x4)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS7951SBRGER FAQ
1.How can I place an order for ADS7951SBRGER through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7951SBRGER 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 ADS7951SBRGER reliable?
The price and inventory of ADS7951SBRGER are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7951SBRGER is usually 5 days.
3.What payment methods are accepted for ADS7951SBRGER?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7951SBRGER transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7951SBRGER?
ADS7951SBRGER orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7951SBRGER 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 ADS7951SBRGER?
For technical support, including ADS7951SBRGER datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7951SBRGER requirements.
6.How does Aetrix verify that ADS7951SBRGER is sourced from the original manufacturer or authorized distributors?
All ADS7951SBRGER 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 ADS7951SBRGER meets industry standards.
7.What is the process for return or replacement of ADS7951SBRGER?
All ADS7951SBRGER units undergo pre-shipment inspection (PSI). If there is an issue with ADS7951SBRGER, 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 ADS7951SBRGER part is unused and in its original packaging.
Return procedure for ADS7951SBRGER:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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