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Texas Instruments ADS7961SDBTR
- Part No.:
- ADS7961SDBTR
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 38-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADS7961SDBTR.pdf
- Description:
- IC ADC 8BIT SAR 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,644
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Product details
Overview
ADS7961SDBTR from Texas Instruments is a 12-bit, 16-channel, single-ended SAR analog-to-digital converter with 1-MSPS throughput, zero-latency operation, and integrated programmable alarms per channel. It features a 20-MHz SPI-compatible serial interface, dual input ranges (0 to VREF and 0 to 2×VREF), and operates from 2.7–5.25 V analog supply for use in high-speed PLC analog input modules.
For engineers reviewing the ADS7961SDBTR datasheet, ADS7961SDBTR pinout, ADS7961SDBTR application, or ADS7961SDBTR equivalent, key selection considerations include channel count (16), resolution (12-bit), sample rate (1 MSPS), alarm threshold configurability, GPIO availability (1 GPIO in VQFN), and TSSOP-38/VQFN-32 package compatibility.
Technical Context
The ADS7961SDBTR implements a capacitor-based SAR architecture with inherent sample-and-hold, enabling zero-latency conversion. Its multiplexer supports 16 single-ended analog inputs (Ch0–Ch15) routed to AINP/AINM, with MXO providing buffered output of the selected channel.
It uses CS-active-low framing and SCLK-synchronized serial communication (SDI/SDO), supporting both auto-sequencing and manual channel selection modes. The device integrates two software-programmable alarm thresholds per channel and accepts external reference voltage (REFP/REFM) with input resistance >1 GΩ.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = VREF/4096 quantization step for precision measurement systems |
| Sample Rate | 1 MSPS - enables real-time capture of signals up to 500 kHz (Nyquist-limited) without aliasing |
| Analog Supply Range | 2.7 V to 5.25 V - supports direct connection to industrial 3.3 V or 5 V rails without LDO |
| I/O Supply Range | 1.7 V to 5.25 V - allows glueless interfacing with 1.8 V, 3.3 V, or 5 V microcontrollers |
| Input Bandwidth | 47 MHz at 3 dB - preserves signal integrity for fast transients and high-frequency sensor outputs |
| Power Dissipation | 14.5 mW at 1 MSPS (+VA = 5 V, +VBD = 3 V) - suitable for thermally constrained multi-channel DAQ designs |
| Power-Down Current | 1 µA - reduces system standby power in battery-backed or isolated monitoring applications |
Pinout & Package
The ADS7961SDBTR is available in a 32-pin VQFN package (5.00 mm × 5.00 mm, RHB suffix), with exposed thermal pad for enhanced heat dissipation in high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AINP / AINM | Differential ADC input pair | Accepts single-ended signal referenced to AINM; AINM must be tied to AGND or driven as common-mode reference |
| MXO | Multiplexer output | Buffered analog output of currently selected channel; usable for external PGA feedback or scope monitoring |
| Ch0–Ch15 | Analog input channels | 16 single-ended inputs; only one active per conversion cycle; internally disconnected when unselected |
| REFP / REFM | Reference voltage terminals | Accept external precision reference (e.g., REF5025); REFM must be connected to AGND for proper biasing |
| CS / SCLK / SDI / SDO | SPI-compatible digital interface | CS active-low initiates conversion; SCLK clocks data in/out; SDI configures registers; SDO returns conversion result |
| GPIO0 | Programmable I/O | Configurable as alarm output (active-high) or general-purpose digital I/O; only GPIO available in VQFN package |
| +VA / AGND | Analog power domain | +VA powers core ADC and mux; AGND provides low-noise return path-must be separated from digital ground |
| +VBD / BDGND | Digital I/O power domain | +VBD sets logic levels for SPI interface; BDGND is dedicated digital ground-separate from AGND |
Key Features
| Feature | Design Value |
|---|---|
| Zero-latency conversion | Eliminates pipeline delay-output reflects instantaneous sampled value, critical for closed-loop control timing |
| Two programmable alarm thresholds per channel | Enables autonomous over/under-limit detection without host CPU intervention, reducing firmware overhead |
| Auto-sequencing mode | Automatically cycles through preconfigured channel list, simplifying continuous multi-channel acquisition firmware |
| Software-selectable input ranges | Supports 0–VREF (full-scale = VREF) or 0–2×VREF (full-scale = 2×VREF) via RANGE pin or register control |
| High input bandwidth (47 MHz) | Preserves edge fidelity of fast pulses (e.g., motor current sensing, laser diode monitoring) without external amplification |
Applications
| PLC Analog Input Module | Optical Line Card Monitoring |
|---|---|
Use Scenario: Simultaneous acquisition of 16 sensor voltages (temperature, pressure, current) in modular industrial controller backplane. IC Role / Device Role / Timing Role: Primary ADC managing all analog front-end digitization; zero-latency ensures deterministic scan cycle timing. Use Value: 16-channel integration reduces component count vs. multiple 4-channel ADCs; 1-MSPS aggregate rate meets IEC 61131-3 cyclic task requirements. | Use Scenario: Real-time monitoring of laser bias current, TEC voltage, and photodiode outputs across 16 ports in DWDM line card. IC Role / Device Role / Timing Role: High-bandwidth ADC capturing transient fault events (e.g., ESD-induced spikes) with 47 MHz input bandwidth. Use Value: Programmable per-channel alarms trigger immediate optical shutdown before damage occurs-no host polling latency. |
| Medical Patient Monitor | Digital Power Supply Telemetry |
Use Scenario: Multi-parameter acquisition (ECG leads, SpO₂ analog, respiration, temperature) in portable bedside monitor with battery backup. IC Role / Device Role / Timing Role: Low-power ADC enabling 14.5 mW active operation and 1 µA power-down state during sleep intervals. Use Value: Dual supply domains (+VA/+VBD) allow independent 3.3 V analog and 1.8 V MCU I/O rail usage-minimizing noise coupling. | Use Scenario: In-system telemetry of 16 DC-DC converter outputs (voltage, current, temperature) for predictive maintenance in server PSU. IC Role / Device Role / Timing Role: Precision ADC digitizing isolated analog feedback signals with 12-bit resolution and <±1 LSB INL. Use Value: External reference support (REF5025) ensures ±0.05% absolute accuracy across temperature-critical for compliance reporting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7960SDBTR | 12-bit, 12-channel variant in same 32-pin VQFN package; identical timing, interface, and feature set | Fewer channels reduce routing complexity in space-constrained 12-input systems; same PCB footprint allows design reuse | Select when 12 channels suffice-reduces BOM cost and layout density without sacrificing performance |
| ADS8688IPWR | 16-bit, 8-channel SAR ADC with integrated PGA and reference; 500 kSPS max; 28-pin TSSOP | Higher resolution but lower channel count and speed; includes on-chip 4× PGA-eliminates external amplifier stage | Choose for precision sensor interfaces requiring >12-bit resolution and signal conditioning, accepting lower channel density |
Compared with ADS7960SDBTR, the ADS7961SDBTR adds four analog inputs (Ch12–Ch15) while retaining identical timing, power, and register compatibility-ideal for scalable I/O expansion. Versus ADS8688IPWR, it trades resolution and integrated gain for higher speed and channel count, favoring high-throughput rather than ultra-precision applications.
Availability
ADS7961SDBTR is available at Aetrix Electronics and suitable for PLC analog input modules, optical line card monitoring, medical patient monitors, and digital power supply telemetry requiring stable component supply across long production lifecycles.
Supply support for ADS7961SDBTR 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-including ADS7961SDBTR-is designed specifically for high-channel-count, high-speed industrial data acquisition where zero-latency, programmable alarms, and flexible supply operation are essential.
FAQ
What is the maximum clock frequency supported by the ADS7961SDBTR serial interface?
The ADS7961SDBTR supports a 20-MHz SCLK, enabling full 12-bit conversion and readout within 20 clock cycles (1 µs). This allows sustained 1-MSPS throughput when CS is asserted continuously, meeting real-time sampling requirements in closed-loop control systems. The ADS7961SDBTR timing specifications guarantee setup/hold compliance up to this rate under recommended operating conditions.
Does the ADS7961SDBTR require an external reference voltage, and what are the acceptable ranges?
Yes, the ADS7961SDBTR requires an external reference applied between REFP and REFM pins. It supports reference voltages from 2.0 V to 3.0 V (per datasheet Section 7.8), with typical use cases employing REF5025 (2.5 V ±0.1 V). The device does not include an internal reference; REFP must be driven, and REFM must connect to AGND to establish the ADC's full-scale range.
How many GPIOs are available on the ADS7961SDBTR, and what functions do they support?
The ADS7961SDBTR in the 32-pin VQFN (RHB) package provides one GPIO: GPIO0. It is programmable as either an active-high alarm output (indicating high/low threshold violation) or a general-purpose digital I/O. Unlike TSSOP variants, the VQFN version does not include GPIO1–GPIO3; this single GPIO is sufficient for basic alarm signaling in compact designs using ADS7961SDBTR.
Can the ADS7961SDBTR operate with different analog and I/O supply voltages, and what are the valid combinations?
Yes, the ADS7961SDBTR supports independent analog (+VA) and digital I/O (+VBD) supplies. +VA may range from 2.7 V to 5.25 V, while +VBD accepts 1.7 V to 5.25 V-enabling mixed-voltage systems (e.g., +VA = 5 V for analog section, +VBD = 1.8 V for SPI interface to low-voltage MCU). Both supplies must be decoupled locally, and BDGND/AGND must remain separate except at a single-point ground.
What is the purpose of the MXO pin on the ADS7961SDBTR, and how is it used in system design?
The MXO (Multiplexer Output) pin on the ADS7961SDBTR provides a buffered analog copy of the currently selected channel's input signal. It can be monitored externally with an oscilloscope or fed into a high-impedance PGA (e.g., THS4031) for signal conditioning prior to digitization. This feature aids debug, enables simultaneous analog processing, and eliminates need for external mux buffering-directly enhancing system flexibility in ADS7961SDBTR-based designs.
ADS7961SDBTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- microPOWER™
- Package/Case:
- 38-TFSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- 1M
- Number of Inputs:
- 16
- 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:
- 38-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS7961SDBTR FAQ
1.How can I place an order for ADS7961SDBTR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7961SDBTR 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 ADS7961SDBTR reliable?
The price and inventory of ADS7961SDBTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7961SDBTR is usually 5 days.
3.What payment methods are accepted for ADS7961SDBTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7961SDBTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7961SDBTR?
ADS7961SDBTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7961SDBTR 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 ADS7961SDBTR?
For technical support, including ADS7961SDBTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7961SDBTR requirements.
6.How does Aetrix verify that ADS7961SDBTR is sourced from the original manufacturer or authorized distributors?
All ADS7961SDBTR 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 ADS7961SDBTR meets industry standards.
7.What is the process for return or replacement of ADS7961SDBTR?
All ADS7961SDBTR units undergo pre-shipment inspection (PSI). If there is an issue with ADS7961SDBTR, 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 ADS7961SDBTR part is unused and in its original packaging.
Return procedure for ADS7961SDBTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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