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Texas Instruments ADS7251IRTER
- Part No.:
- ADS7251IRTER
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
ADS7251IRTER.pdf
- Description:
- IC ADC 12BIT SAR 16WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,781
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Product details
Overview
ADS7251IRTER from Texas Instruments is a 12-bit, dual-channel, simultaneous-sampling analog-to-digital converter with independent internal 2.5-V references per channel, 2-MSPS throughput, 73-dB SNR, and ±1-LSB INL-designed for high-precision motor control feedback loops requiring synchronized acquisition of differential encoder signals.
For engineers reviewing the ADS7251IRTER datasheet, ADS7251IRTER pinout, ADS7251IRTER application, or ADS7251IRTER equivalent, key selection considerations include its WQFN-16 package, fully differential input architecture, simultaneous sampling capability, extended industrial temperature range (–40°C to +125°C), and serial interface timing compatibility with FPGA or MCU host controllers.
Technical Context
The ADS7251IRTER implements two independent successive-approximation register (SAR) ADCs with dedicated CDACs and comparators, enabling true simultaneous sampling without inter-channel skew. Each ADC uses its own internal reference (REFOUT_A/REFOUT_B) and reference ground (REFGND_A/REFGND_B), supporting isolated signal chains.
It employs a fully differential input structure where AINP_x and AINM_x accept voltage differences up to ±2.5 V (full-scale = 2 × VREF), with common-mode voltage fixed at VREF (±0.1 V). The serial interface operates with CS-active-low framing, SCLK-synchronized data output on SDO-A and SDO-B, and supports 32-MHz clock frequency for 2-MSPS operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes with monotonic transfer function and no missing codes over full temperature range. |
| Sampling Rate | 2 MSPS - enables real-time capture of fast transients in motor current or voltage sensing at ≤500-ns sample interval. |
| SNR | 73 dB - supports ≥11.8 effective number of bits (ENOB) for high-fidelity signal reconstruction in noise-sensitive applications. |
| INL | ±1 LSB - ensures linearity error <0.024% of full scale, critical for accurate position or phase measurement in Sin/Cos encoders. |
| Input Range | ±2.5 V differential (with 2.5-V internal reference) - matches standard resolver or encoder output levels without external scaling. |
| Temperature Range | –40°C to +125°C - qualified for under-hood automotive, industrial drive, and grid-edge power electronics environments. |
| Supply Voltages | AVDD = 5 V, DVDD = 3.3 V - allows direct interfacing with 3.3-V logic while maintaining 5-V analog headroom for dynamic range. |
Pinout & Package
ADS7251IRTER is housed in a thermally enhanced WQFN-16 (3 mm × 3 mm) package with exposed thermal pad. Pin numbering follows top-view layout; thermal pad must be soldered to PCB ground for optimal thermal performance and noise immunity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REFOUT-A (Pin 1) | Analog output | 2.5-V reference voltage source for ADC_A; requires 22-μF decoupling to REFGND-A for stability. |
| REFGND-A (Pin 2) | Reference ground | Dedicated low-noise ground return for REFOUT-A and ADC_A analog section; must be isolated from digital GND. |
| REFGND-B (Pin 3) | Reference ground | Dedicated low-noise ground return for REFOUT-B and ADC_B analog section; prevents inter-channel crosstalk. |
| REFOUT-B (Pin 4) | Analog output | 2.5-V reference voltage source for ADC_B; independently trimmed and matched to REFOUT-A within ±1 mV. |
| AINM-B (Pin 5) | Analog input | Negative differential input for ADC_B; forms matched pair with AINP-B for common-mode rejection >72 dB. |
| AINP-B (Pin 6) | Analog input | Positive differential input for ADC_B; supports full-scale differential swing of ±2.5 V referenced to REFGND-B. |
| DVDD (Pin 7) | Digital supply | 3.3-V I/O supply; powers serial interface and digital logic; compatible with standard LVCMOS host controllers. |
| GND (Pins 8, 13) | Digital ground | Return path for DVDD and digital I/O; must be connected to system ground plane with low-inductance routing. |
| CS (Pin 9) | Digital input | Active-low chip-select; initiates conversion sequence and frames serial data output on SDO-A/SDO-B. |
| SCLK (Pin 10) | Digital input | Serial clock input; controls data shift rate; supports up to 32 MHz for 2-MSPS operation with precise setup/hold timing. |
| SDO-A (Pin 11) | Digital output | Serial data output for ADC_A; delivers 12-bit result MSB-first after CS assertion and SCLK edge alignment. |
| SDO-B (Pin 12) | Digital output | Serial data output for ADC_B; time-aligned with SDO-A to preserve simultaneity; tri-states when CS is high. |
| AINP-A (Pin 15) | Analog input | Positive differential input for ADC_A; paired with AINM-A to reject common-mode noise in high-EMI environments. |
| AINM-A (Pin 16) | Analog input | Negative differential input for ADC_A; input capacitance is 4 pF in hold mode, minimizing settling burden on driving circuitry. |
| AVDD (Pin 14) | Analog supply | 5-V analog supply; defines absolute input voltage limits (0 to AVDD) and powers SAR core, reference, and input buffers. |
| Thermal Pad | Supply | Exposed copper pad; must be soldered to solid ground plane to maintain junction temperature ≤125°C at full throughput. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous sampling | True concurrent acquisition across both channels with <40-ps inter-channel aperture mismatch-enables accurate phase difference measurement in three-phase systems. |
| Independent internal references | Two trimmed 2.5-V references (REFOUT_A/REFOUT_B) with ±1-mV matching and ±10-ppm/°C drift-eliminates need for external reference ICs and reduces BOM count. |
| Fully differential inputs | Each channel accepts ±2.5-V differential signals with 72-dB CMRR up to 20 kHz-rejects EMI and ground-loop noise in motor drive feedback paths. |
| Extended temperature operation | Specified from –40°C to +125°C with guaranteed DC accuracy (±1 LSB INL) and AC performance (73-dB SNR)-supports deployment in harsh industrial enclosures. |
| Space-efficient packaging | WQFN-16 (3 mm × 3 mm) with thermal pad-reduces PCB area by >40% vs. TSSOP-16 while improving thermal resistance (RθJA = 33.3°C/W). |
Applications
| Motor Control Feedback | Power Quality Monitoring |
|---|---|
Use Scenario: Real-time acquisition of dual Sin/Cos resolver outputs in servo drives for closed-loop position estimation. IC Role / Device Role / Timing Role: Simultaneous-sampling ADC providing time-aligned 12-bit digitized pairs at 2 MSPS for angle computation via arctangent lookup or CORDIC. Use Value: Eliminates inter-channel skew-induced phase error (<0.01° at 10-kHz signal), directly improving position resolution and torque ripple suppression. | Use Scenario: Capturing voltage and current waveforms in smart meters or PQ analyzers for harmonic distortion analysis per IEC 61000-4-30. IC Role / Device Role / Timing Role: Dual-channel ADC synchronously sampling line voltage and neutral current to compute THD, SFDR, and flicker metrics. Use Value: 73-dB SNR and 90-dB SFDR enable accurate detection of 0.1% harmonic content up to 50th order (2.5 kHz @ 50-Hz fundamental). |
| Protection Relay Sensing | Industrial PLC Analog Input |
Use Scenario: High-speed fault detection in feeder protection relays using differential current comparison between CT inputs. IC Role / Device Role / Timing Role: Simultaneous digitization of two CT secondary signals to compute instantaneous differential current for overcurrent and earth-fault algorithms. Use Value: ±1-LSB INL and 2-MSPS rate support sub-cycle fault detection (<500 ns response latency), meeting IEEE C37.90 transient requirements. | Use Scenario: Modular analog input module in programmable logic controllers acquiring multiple sensor signals (e.g., pressure + temperature) with deterministic timing. IC Role / Device Role / Timing Role: Dual ADC serving as front-end for two isolated sensor channels, delivering synchronized samples to ARM Cortex-M host via SPI. Use Value: Independent internal references remove dependency on shared reference rail, preventing cross-talk between channels during multiplexed reads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel, simultaneous-sampling ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7250IRTER | Single-channel 12-bit, 2-MSPS SAR ADC; identical pinout but lacks second ADC and REFOUT-B/REFGND-B pins. | Not suitable for true simultaneous dual-channel acquisition; requires two devices and external synchronization for pseudo-simultaneous sampling. | Select only if system needs only one analog channel or can tolerate inter-channel skew >100 ns. |
| ADS7851IRTER | 14-bit, 1.5-MSPS variant in same WQFN-16 package; shares pinout, timing, and reference architecture but trades speed for resolution. | Better suited for high-resolution, lower-bandwidth applications like precision energy metering where SNR >83 dB is required. | Choose when ENOB >13 bits is mandatory and 1.5-MSPS sampling satisfies system latency requirements. |
Compared with ADS7250IRTER, ADS7251IRTER provides true simultaneity and channel isolation; compared with ADS7851IRTER, it delivers 0.5-MSPS higher throughput at the cost of 10-dB lower SNR-making it optimal for bandwidth-critical motor control versus resolution-critical metering.
Availability
ADS7251IRTER is available at Aetrix Electronics and suitable for motor control feedback, power quality monitoring, protection relay sensing, and industrial PLC analog input applications requiring stable component supply across automotive-grade temperature ranges and long production lifecycles.
Supply support for ADS7251IRTER 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 company specializing in analog and embedded processing technologies, with leadership in precision data converters, power management, and industrial interface solutions.
The ADS7251IRTER belongs to TI's ADS7x51 family of dual, simultaneous-sampling SAR ADCs-designed specifically for high-reliability industrial automation systems demanding synchronized, high-speed, and high-accuracy analog acquisition.
FAQ
What is the maximum sampling rate supported by the ADS7251IRTER?
The ADS7251IRTER supports a maximum sampling rate of 2 million samples per second (2 MSPS) under recommended operating conditions (AVDD = 5 V, DVDD = 3.3 V, fCLK = 32 MHz). This rate is achievable with proper timing compliance-including tSU_CSCK ≥15 ns and tACQ ≥75 ns-and is fully specified across the –40°C to +125°C temperature range. At this rate, the ADS7251IRTER delivers 12-bit results for both channels simultaneously every 500 ns.
Does the ADS7251IRTER require external reference components?
No, the ADS7251IRTER does not require external reference components. It integrates two independent, trimmed 2.5-V internal voltage references (REFOUT_A and REFOUT_B), each with ±1-mV matching and ±10-ppm/°C temperature drift. Each reference must be decoupled to its dedicated REFGND pin using a 22-μF capacitor, as specified in the datasheet-no additional reference ICs, buffers, or trimming resistors are needed for full-spec operation of the ADS7251IRTER.
How is simultaneity achieved between the two ADC channels in the ADS7251IRTER?
Simultaneity in the ADS7251IRTER is achieved through physically separate SAR cores, CDACs, and sampling switches for each channel (ADC_A and ADC_B), all triggered by a single internal sampling pulse derived from the CS falling edge. Inter-channel aperture delay mismatch is guaranteed ≤40 ps, ensuring time-aligned acquisition of differential inputs AINP-A/AINM-A and AINP-B/AINM-B-critical for phase-sensitive applications like motor control and protection relaying where the ADS7251IRTER maintains true simultaneity without software or external hardware synchronization.
What are the absolute input voltage limits for AINP-A and AINM-A on the ADS7251IRTER?
For the ADS7251IRTER, the absolute input voltage on AINP-A or AINM-A (relative to REFGND-A) must remain within 0 V to AVDD (5 V), and the differential input voltage (AINP-A – AINM-A) must be within –2.5 V to +2.5 V when using the internal 2.5-V reference. Exceeding these limits-such as applying >5 V to either pin or >2.5 V differential-may cause irreversible damage or parametric degradation, as defined in the Absolute Maximum Ratings table of the ADS7251IRTER datasheet.
Can the ADS7251IRTER operate with different supply voltages for AVDD and DVDD?
Yes, the ADS7251IRTER supports independent supply domains: AVDD must be 4.75 V to 5.25 V (nominal 5 V) for analog performance, while DVDD operates from 1.65 V to 3.6 V (nominal 3.3 V) for digital I/O compatibility. This dual-supply flexibility allows direct interfacing with 3.3-V microcontrollers or FPGAs while preserving full analog dynamic range-enabling robust system-level integration without level-shifting circuitry for the ADS7251IRTER.
ADS7251IRTER 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:
- 12
- Sampling Rate (Per Second):
- 2M
- Number of Inputs:
- 2
- Input Type:
- Differential
- Data Interface:
- SPI
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 2
- Architecture:
- SAR
- Reference Type:
- Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 1.65V ~ 5.25V
- Features:
- Simultaneous Sampling
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 16-WQFN (3x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS7251IRTER FAQ
1.How can I place an order for ADS7251IRTER through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7251IRTER 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 ADS7251IRTER reliable?
The price and inventory of ADS7251IRTER are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7251IRTER is usually 5 days.
3.What payment methods are accepted for ADS7251IRTER?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7251IRTER transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7251IRTER?
ADS7251IRTER orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7251IRTER 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 ADS7251IRTER?
For technical support, including ADS7251IRTER datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7251IRTER requirements.
6.How does Aetrix verify that ADS7251IRTER is sourced from the original manufacturer or authorized distributors?
All ADS7251IRTER 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 ADS7251IRTER meets industry standards.
7.What is the process for return or replacement of ADS7251IRTER?
All ADS7251IRTER units undergo pre-shipment inspection (PSI). If there is an issue with ADS7251IRTER, 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 ADS7251IRTER part is unused and in its original packaging.
Return procedure for ADS7251IRTER:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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