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Texas Instruments ADS7956SRHBR
- Part No.:
- ADS7956SRHBR
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
ADS7956SRHBR.pdf
- Description:
- IC ADC 10BIT SAR 32VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,017
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Product details
Overview
ADS7956SRHBR from Texas Instruments is a 12-bit, 12-channel, single-ended SAR analog-to-digital converter with 1-MSPS sample rate, zero-latency operation, and 20-MHz 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 ADS7956SRHBR datasheet, ADS7956SRHBR pinout, ADS7956SRHBR application, or ADS7956SRHBR equivalent, key selection considerations include channel count (12), resolution (12-bit), serial interface timing (20-MHz SCLK), GPIO configuration (one GPIO in VQFN), and alarm threshold programmability per channel - all critical for high-speed industrial data acquisition system design.
Technical Context
The ADS7956SRHBR implements a capacitor-based SAR architecture with integrated sample-and-hold, enabling zero-latency conversion and deterministic timing. Its serial interface uses active-low CS for sampling initiation and SCLK for synchronous data transfer, supporting both auto-sequencing and manual channel selection modes.
It accepts dual input voltage ranges via the RANGE pin (GPIO2), supports independent alarm level programming per channel, and provides a multiplexer output (MXO) for external signal conditioning. The device includes one configurable GPIO (GPIO0) in its RHB package, used for alarm indication or general-purpose I/O.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = VREF/4096 quantization step for precise sensor digitization. |
| Sample Rate | 1 MSPS - enables capture of signals up to 500 kHz (Nyquist) without aliasing in closed-loop control. |
| Analog Supply Range | 2.7 V to 5.25 V - allows direct interface with common industrial rails (e.g., +3.3 V or +5 V analog domains). |
| I/O Supply Range | 1.7 V to 5.25 V - ensures glueless interfacing with 1.8-V, 3.3-V, or 5-V microcontrollers and FPGAs. |
| Input Ranges | 0 to VREF or 0 to 2×VREF - selectable via RANGE pin to optimize dynamic range for varying sensor outputs. |
| Alarm Functionality | Two programmable thresholds per channel - enables autonomous over/under-range detection without host polling. |
| Power Dissipation | 14.5 mW at 1 MSPS (+VA = 5 V, +VBD = 3 V) - supports thermally constrained industrial PCB layouts. |
| Power-Down Current | 1 µA - extends battery life in portable instrumentation or reduces standby power in always-on systems. |
Pinout & Package
RHB package: 32-pin VQFN (5.00 mm × 5.00 mm), wettable flank, RoHS-compliant, thermal pad exposed on underside.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AINP | Analog input | Positive ADC input node; accepts buffered or unbuffered single-ended signals up to +VA. |
| AINM | Analog input | ADC reference ground; must be tied to AGND or low-impedance sensor return path. |
| MXO | Analog output | Multiplexer output; provides access to selected channel's analog signal before ADC conversion. |
| Ch0–Ch11 | Analog input | Twelve single-ended analog input channels; internally routed to SAR core via programmable MUX. |
| REFP / REFM | Analog reference | Differential reference inputs; support external precision reference (e.g., REF5025) or internal VREF derivation. |
| CS | Digital input | Active-low chip select; falling edge initiates sampling; must remain low during full conversion cycle. |
| SCLK | Digital input | Serial clock input; up to 20 MHz; controls conversion timing, data output strobing, and register access. |
| SDI / SDO | Digital I/O | Serial data in/out; bidirectional SPI-compatible interface for configuration, alarm readback, and conversion results. |
| GPIO0 | Digital I/O | Configurable as alarm output (active-high) or general-purpose I/O; only GPIO available in RHB package. |
| +VA / AGND | Analog supply | Primary analog power domain (2.7–5.25 V); AGND pins provide dedicated low-noise return paths. |
| +VBD / BDGND | Digital supply | Independent I/O supply (1.7–5.25 V); decoupling required to minimize digital noise coupling into analog section. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-latency conversion | Eliminates pipeline delay; enables real-time feedback in servo control and fast-loop applications. |
| Per-channel programmable alarms | Reduces host CPU load by autonomously flagging out-of-range conditions on any of 12 channels. |
| Auto/manual channel sequencing | Supports flexible scan patterns: continuous round-robin (auto) or on-demand single-channel reads (manual). |
| Wide input bandwidth (47 MHz @ 3 dB) | Preserves signal integrity for high-frequency transients and fast-rising sensor outputs. |
| Low-power power-down mode (1 µA) | Enables energy-efficient operation in intermittent-sampling applications like environmental monitoring. |
| Input range selection (0–VREF / 0–2×VREF) | Maximizes SNR across diverse sensor types (e.g., 0–2.5 V RTD vs. 0–5 V industrial 4–20 mA receivers). |
Applications
| PLC Analog Input Module | Optical Line Card Monitoring |
|---|---|
|
Use Scenario: Digitizing 12 channels of current/voltage sensor outputs (e.g., 4–20 mA loops, thermocouples) in modular industrial controllers. IC Role / Device Role / Timing Role: Primary ADC for multi-channel analog front-end; performs synchronized sampling with zero latency for deterministic control loop timing. Use Value: Enables simultaneous monitoring of motor temperature, position feedback, and power rail voltages within a single compact module. |
Use Scenario: Real-time monitoring of laser bias current, photodiode output, and TEC voltage in telecom optical transceivers. IC Role / Device Role / Timing Role: High-speed, low-latency ADC for closed-loop bias control; supports rapid response to optical power fluctuations. Use Value: Maintains stable laser output by feeding back digitized sensor data to DAC-controlled drivers within sub-microsecond loop times. |
| Medical Patient Monitor | Digital Power Supply Telemetry |
|
Use Scenario: Acquiring ECG, respiration, and SpO₂ analog signals in portable bedside monitors requiring low power and high reliability. IC Role / Device Role / Timing Role: Multi-channel signal digitizer with programmable alarms; triggers alerts on physiological parameter thresholds without host intervention. Use Value: Reduces MCU processing burden while ensuring immediate clinical response to abnormal vital signs. |
Use Scenario: Measuring input/output voltage, current, and temperature in digitally controlled AC/DC and DC/DC converters. IC Role / Device Role / Timing Role: Telemetry ADC providing real-time feedback for digital power management ICs (e.g., TI UCD3138). Use Value: Enables adaptive compensation and fault protection by delivering accurate, time-aligned measurements across multiple power stages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7953SRHBR | 16-channel, same 12-bit resolution and 1-MSPS rate; shares identical RHB package and pinout. | Supports higher channel density in same footprint; requires no PCB change if layout accommodates extra Ch12–Ch15. | Select when system requires >12 analog inputs and board space is constrained. |
| ADS8684IPWR | 16-bit, 4-channel, pseudo-differential SAR ADC; 500-kSPS max; integrated PGA and reference; different pinout. | Higher resolution but fewer channels; built-in 4× PGA simplifies front-end design for low-level sensors. | Select when precision (±0.02% FS) outweighs channel count, and PGA integration reduces BOM cost. |
Compared with ADS7956SRHBR, ADS7953SRHBR offers expanded channel count in identical packaging for seamless scalability, while ADS8684IPWR trades channel density for higher resolution and integrated signal conditioning - making it suitable for precision, lower-channel-count applications where PGA and reference integration reduce system complexity.
Availability
ADS7956SRHBR is available at Aetrix Electronics and suitable for PLC analog input modules, optical line card telemetry, and medical patient monitor designs requiring stable component supply, long-term industrial lifecycle support, and consistent parametric performance across production batches.
Supply support for ADS7956SRHBR 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, embedded processing, and connectivity technologies, with decades of experience in precision data acquisition and industrial-grade IC design.
The ADS79xx family was designed specifically for high-speed, multi-channel industrial data acquisition - emphasizing zero-latency operation, flexible channel sequencing, and robust alarm functionality to simplify real-time monitoring system development.
FAQ
What is the maximum serial clock frequency supported by the ADS7956SRHBR?
The ADS7956SRHBR supports a maximum SCLK frequency of 20 MHz, enabling full 12-bit conversion and data readout within 1 µs. This timing aligns with its 1-MSPS sample rate specification and ensures deterministic interface behavior with microcontrollers and FPGAs operating at standard logic speeds. The ADS7956SRHBR datasheet specifies tCLKH and tCLKL minimum values to guarantee reliable setup/hold margins.
Does the ADS7956SRHBR require an external reference voltage?
Yes, the ADS7956SRHBR requires an external reference applied to REFP and REFM pins. It does not include an internal reference. A precision source such as the REF5025 (2.5 V) is commonly used, and the device supports input ranges of 0 to VREF or 0 to 2×VREF depending on the RANGE pin state. The ADS7956SRHBR's reference input resistance is specified to ensure stability with typical reference buffers.
How many GPIOs are available on the ADS7956SRHBR in the RHB package?
The ADS7956SRHBR in the 32-pin RHB VQFN package provides one GPIO: GPIO0. Unlike TSSOP variants (which offer four GPIOs), the RHB variant dedicates pins to maximize channel count and serial interface reliability. GPIO0 can be configured as an active-high alarm output or general-purpose I/O via internal register settings, as documented in the ADS7956SRHBR programming section.
Can the ADS7956SRHBR perform automatic channel sequencing across all 12 inputs?
Yes, the ADS7956SRHBR supports auto-sequencing across all 12 channels (Ch0–Ch11) in configurable scan orders. In Auto-1 mode, it cycles continuously through a preselected subset; in Auto-2 mode, it scans all enabled channels in ascending order. Channel enable/disable and sequence definition are controlled via SPI register writes, allowing flexible runtime reconfiguration without firmware changes to the host processor.
What is the purpose of the MXO pin on the ADS7956SRHBR?
The MXO (Multiplexer Output) pin on the ADS7956SRHBR provides buffered access to the analog signal selected by the internal multiplexer prior to ADC conversion. This allows external circuitry - such as a high-input-impedance PGA (e.g., THS4031) or anti-alias filter - to condition the signal without loading the input channel. The ADS7956SRHBR's MXO output is rail-to-rail capable and maintains signal fidelity for precision front-end design.
ADS7956SRHBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- microPOWER™
- Package/Case:
- 32-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 10
- Sampling Rate (Per Second):
- 1M
- Number of Inputs:
- 12
- 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:
- 32-VQFN (5x5)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS7956SRHBR FAQ
1.How can I place an order for ADS7956SRHBR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7956SRHBR 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 ADS7956SRHBR reliable?
The price and inventory of ADS7956SRHBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7956SRHBR is usually 5 days.
3.What payment methods are accepted for ADS7956SRHBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7956SRHBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7956SRHBR?
ADS7956SRHBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7956SRHBR 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 ADS7956SRHBR?
For technical support, including ADS7956SRHBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7956SRHBR requirements.
6.How does Aetrix verify that ADS7956SRHBR is sourced from the original manufacturer or authorized distributors?
All ADS7956SRHBR 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 ADS7956SRHBR meets industry standards.
7.What is the process for return or replacement of ADS7956SRHBR?
All ADS7956SRHBR units undergo pre-shipment inspection (PSI). If there is an issue with ADS7956SRHBR, 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 ADS7956SRHBR part is unused and in its original packaging.
Return procedure for ADS7956SRHBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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