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Texas Instruments ADS7945SRTER
- Part No.:
- ADS7945SRTER
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
ADS7945SRTER.pdf
- Description:
- IC ADC 14BIT SAR 16WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,218
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Product details
Overview
ADS7945SRTER from Texas Instruments is a 14-bit, 2 MSPS dual-channel successive approximation register (SAR) analog-to-digital converter with differential input architecture, 84 dB SNR, ±1.5 LSB INL (max), and 11.6 mW power consumption at full speed. It operates from 2.7 V to 5.25 V AVDD and interfaces via SPI-compatible serial interface, enabling high-precision data acquisition in optical networking and medical instrumentation.
For engineers reviewing the ADS7945SRTER datasheet, ADS7945SRTER pinout, ADS7945SRTER application, or ADS7945SRTER equivalent, this page delivers verified specifications, QFN-16 pin mapping, differential-input system integration guidance, and validated alternative options for industrial-grade signal chain design.
Technical Context
The ADS7945SRTER implements a true differential input multiplexer feeding a low-power SAR ADC with inherent sample-and-hold functionality. Its 16-clock SPI frame supports deterministic 2 MSPS throughput with 10 ns aperture jitter and 80 ns acquisition time.
It features independent channel selection via CH SEL pin, hardware power-down control via PDEN, and reference decoupling through dedicated REFGND-enabling stable performance across –40°C to +125°C without external buffering or calibration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - delivers 16,384 distinct output codes for high-fidelity signal digitization |
| Sample Rate | 2 MSPS - supports real-time capture of signals up to 15 MHz full-power bandwidth |
| SNR | 84 dB - enables >13.6 effective number of bits (ENOB) at 20 kHz input |
| INL (max) | ±1.5 LSB - ensures monotonicity and linearity critical for closed-loop control accuracy |
| Power @ 2 MSPS | 11.6 mW - reduces thermal load and extends battery life in portable instrumentation |
| Analog Supply | 2.7 V to 5.25 V - allows direct interfacing with ±5 V differential sensor outputs |
| Digital Supply | 1.65 V to AVDD - supports mixed-voltage SoC integration with 1.8 V or 3.3 V logic |
Pinout & Package
ADS7945SRTER is housed in a 3 mm × 3 mm, 16-pin QFN package (RTE) with wettable flanks, rated for –40°C to +125°C operation and optimized for low-inductance analog grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Analog/digital ground reference | Single-point return for all analog and digital signals; must connect to low-impedance ground plane |
| AVDD (Pin 2) | Analog power supply | Supplies SAR core and input mux; requires local 100 nF + 10 µF decoupling |
| REF (Pin 3) | Positive reference input | Accepts 2.5 V to AVDD external reference; defines full-scale differential span |
| REFGND (Pin 4) | Reference return | Must be shorted to analog ground; isolates reference path from noisy digital returns |
| AIN0P / AIN0N (Pins 5/6) | Differential input channel 0 | True differential pair accepting ±VREF span; rejects common-mode noise up to 60 dB PSRR |
| AIN1N / AIN1P (Pins 7/8) | Differential input channel 1 | Second independent differential input; shares same reference and timing resources |
| CH SEL (Pin 11) | Channel select control | Static logic input selecting AIN0 or AIN1 before conversion; no latency penalty |
| PDEN (Pin 12) | Power-down enable | Active-high signal entering 2.5 µA static mode within 1 µs; eliminates idle current |
| CS (Pin 13) | Chip select | Active-low SPI frame initiator; triggers conversion on falling edge |
| SCLK (Pin 14) | SPI clock input | Accepts up to 40 MHz clock; defines 16-cycle frame timing for deterministic latency |
| SDO (Pin 15) | SPI data output | MSB-first, 16-bit serial output; tri-stated when CS is high |
| DVDD (Pin 16) | Digital I/O supply | Independent rail for SDO/CS/SCLK logic; decoupled separately from AVDD |
Key Features
| Feature | Design Value |
|---|---|
| Dual differential input channels | Enables simultaneous sampling of two isolated sensor signals without external multiplexing or gain switching |
| Hardware channel selection | CH SEL pin allows zero-latency channel switching synchronized to CS edge-no software overhead |
| Sub-10 ps aperture jitter | Supports undersampling of RF signals up to 15 MHz with minimal SNR degradation |
| Auto power-down at lower speeds | Reduces AVDD current to 1.4 mW at 100 kSPS and 0.3 mW at 20 kSPS-ideal for duty-cycled sensing |
| Extended temperature range | Guaranteed 14-bit performance from –40°C to +125°C-suitable for under-hood automotive or industrial motor control |
Applications
| Optical Networking Monitoring | Medical ECG Signal Acquisition |
|---|---|
Use Scenario: Real-time monitoring of laser diode bias current and photodiode feedback in DWDM transceivers. IC Role / Device Role / Timing Role: Dual-channel ADC digitizes differential current-sense and voltage-monitor signals with synchronized sampling. Use Value: 84 dB SNR preserves dynamic range for detecting sub-mA drifts; 2 MSPS captures transient fault events before protection triggers. | Use Scenario: High-fidelity acquisition of differential lead-II ECG signals in portable patient monitors. IC Role / Device Role / Timing Role: SAR ADC converts amplified biopotential inputs with inherent 60 dB CMRR and no missing codes. Use Value: ±1.5 LSB INL ensures accurate ST-segment analysis; 11.6 mW enables >24-hour battery runtime at 1 kSPS. |
| Battery-Powered Test Equipment | Data Acquisition Systems |
Use Scenario: Handheld oscilloscope front-end capturing sensor waveforms in field service tools. IC Role / Device Role / Timing Role: Differential input rejects noise from shared battery rails and switching regulators during multi-channel capture. Use Value: 2.7 V AVDD minimum allows direct Li-ion (3.0–4.2 V) operation; PDEN pin cuts standby current to 2.5 µA. | Use Scenario: Modular DAQ module acquiring vibration and temperature data from industrial machinery. IC Role / Device Role / Timing Role: Dual-channel ADC feeds FPGA-based FFT engine with deterministic 500 ns conversion latency. Use Value: SPI interface simplifies FPGA integration; QFN-16 footprint minimizes PCB area in dense backplane designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7946SRTER | 14-bit, single-ended input (AINx/AINxGND); 82 dB SNR; ±2.5 LSB INL (max) | Requires single-ended sensors or external instrumentation amps; lower noise rejection in noisy environments | Select when interfacing with grounded-output transducers and cost-sensitive BOMs allow trade-off in CMRR |
| AD7980BRMZ | 16-bit, single-channel, 1 MSPS, 750 µA quiescent current; no CH SEL or PDEN pins | Lacks dual-channel capability and hardware power management; requires external mux for multi-signal systems | Choose for higher resolution in single-signal precision measurement where throughput and power-down are secondary |
Compared with ADS7946SRTER and AD7980BRMZ, the ADS7945SRTER uniquely combines dual differential channels, hardware channel selection, and ultra-low power-down current-making it optimal for compact, battery-aware, noise-immune multi-sensor systems requiring deterministic timing.
Availability
ADS7945SRTER is available at Aetrix Electronics and suitable for optical networking monitoring, medical ECG signal acquisition, and battery-powered test equipment requiring stable component supply, extended temperature support, and guaranteed long-term manufacturability.
Supply support for ADS7945SRTER 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.
The ADS7945SRTER belongs to TI's precision SAR ADC portfolio, engineered for high-speed, low-power, multi-channel data acquisition in space-constrained, thermally demanding applications.
FAQ
What is the maximum sample rate supported by the ADS7945SRTER?
The ADS7945SRTER supports a maximum sample rate of 2 MSPS, achieved using a 40 MHz SCLK with a fixed 16-clock SPI frame. This throughput is fully specified over the –40°C to +125°C temperature range and maintains 84 dB SNR and ±1.5 LSB INL at full speed. The conversion time is precisely 16 SCLK cycles, enabling deterministic timing for real-time control loops.
Does the ADS7945SRTER require an external reference voltage?
Yes, the ADS7945SRTER requires an external reference voltage applied to the REF pin, with valid range from 2.5 V to AVDD. The device does not include an internal reference. REFGND must be externally shorted to the analog ground plane to ensure reference stability and minimize noise coupling into the ADC core. Reference decoupling with 100 nF ceramic + 10 µF tantalum is recommended.
How does the CH SEL pin function in the ADS7945SRTER?
The CH SEL pin on the ADS7945SRTER selects between differential input channels: logic low selects AIN0P/AIN0N, logic high selects AIN1P/AIN1N. Channel switching must occur within a defined window-half a clock cycle after the CS falling edge-to guarantee proper multiplexer settling before sampling begins. This hardware-controlled selection avoids software-induced latency and ensures deterministic channel assignment per conversion frame.
What is the power consumption of the ADS7945SRTER at 100 kSPS?
At 100 kSPS, the ADS7945SRTER consumes 1.4 mW total power (11.6 mW at 2 MSPS scaled per throughput). This reduction is enabled by automatic power-down during inter-conversion periods when SCLK is inactive. The AVDD supply current drops to approximately 420 µA at 3.3 V, while DVDD current scales with SDO toggle rate-ensuring minimal energy use in duty-cycled sensing applications.
Is the ADS7945SRTER pin-compatible with other devices in the ADS794x family?
No, the ADS7945SRTER is not pin-compatible with ADS7946SRTER despite sharing the same QFN-16 (RTE) package and pinout numbering. While both devices share identical mechanical footprint and power/control pins, their analog input pin assignments differ: ADS7945 uses AIN0P/AIN0N/AIN1N/AIN1P (differential), whereas ADS7946 uses AIN0/AIN0GND/AIN1GND/AIN1 (single-ended). PCB layout must match the specific variant's signal routing.
ADS7945SRTER Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 14
- Sampling Rate (Per Second):
- 2M
- Number of Inputs:
- 2
- Input Type:
- Differential
- 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:
- 1.65V ~ 5.25V
- Features:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 16-WQFN (3x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS7945SRTER FAQ
1.How can I place an order for ADS7945SRTER through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7945SRTER 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 ADS7945SRTER reliable?
The price and inventory of ADS7945SRTER are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7945SRTER is usually 5 days.
3.What payment methods are accepted for ADS7945SRTER?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7945SRTER transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7945SRTER?
ADS7945SRTER orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7945SRTER 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 ADS7945SRTER?
For technical support, including ADS7945SRTER datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7945SRTER requirements.
6.How does Aetrix verify that ADS7945SRTER is sourced from the original manufacturer or authorized distributors?
All ADS7945SRTER 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 ADS7945SRTER meets industry standards.
7.What is the process for return or replacement of ADS7945SRTER?
All ADS7945SRTER units undergo pre-shipment inspection (PSI). If there is an issue with ADS7945SRTER, 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 ADS7945SRTER part is unused and in its original packaging.
Return procedure for ADS7945SRTER:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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