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Texas Instruments ADS7250IRTER
- Part No.:
- ADS7250IRTER
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
ADS7250IRTER.pdf
- Description:
- IC ADC 12BIT SAR 16WQFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
ADS7250IRTER from Texas Instruments is a 12-bit, dual-channel, simultaneous-sampling analog-to-digital converter (ADC) with pseudo-differential inputs, 750-kSPS throughput, ±1 LSB max INL, and 73-dB SNR at 20 kHz - used in motor control position feedback loops requiring synchronized voltage sampling across two channels.
For engineers reviewing the ADS7250IRTER datasheet, ADS7250IRTER pinout, ADS7250IRTER application, or ADS7250IRTER equivalent, this page delivers verified specifications, WQFN-16 package details, real-world use cases in industrial automation and power quality measurement, and validated alternative parts for design continuity.
Technical Context
The ADS7250IRTER implements a successive-approximation register (SAR) architecture with independent sample-and-hold for each channel, enabling true simultaneous acquisition of two analog signals. Its pseudo-differential input structure accepts AINP_x–AINM_x voltage differences referenced to dedicated REFGND_x pins, supporting flexible external reference configurations.
It uses a simple 4-wire SPI-compatible serial interface (CS, SCLK, SDO-A, SDO-B) operating up to 24 MHz, with separate digital outputs per ADC channel and full specification over –40°C to +125°C. The device requires separate AVDD (5 V) and DVDD (3.3 V) supplies, with independent analog and digital ground paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for medium-precision industrial sensing and control. |
| Sampling Rate | 750 kSPS - supports real-time capture of fast transients in motor current or voltage waveforms. |
| INL (Max) | ±1 LSB - ensures monotonicity and <0.025% full-scale linearity error in closed-loop feedback systems. |
| SNR | 73 dB at 20 kHz - enables >11.8 effective number of bits (ENOB) for accurate RMS and harmonic analysis. |
| THD | –88 dB - suppresses harmonic distortion critical for clean spectral representation in power quality analyzers. |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive ECUs and industrial drive cabinets without derating. |
| Package | WQFN-16 (3 mm × 3 mm) - surface-mount footprint compatible with high-density PCB layouts and automated assembly. |
Pinout & Package
The ADS7250IRTER is housed in a thermally enhanced 16-pin WQFN package (RTE) with an exposed thermal pad recommended for connection to PCB ground. Pin numbering follows top-view orientation with pin 1 at top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REFIN-A (Pin 1) | Analog input | Reference voltage input for ADC_A; supports external 2.25–2.5 V reference or AVDD/2. |
| REFGND-A (Pin 2) | Supply | Dedicated reference ground return for ADC_A - must be routed separately from system GND to minimize noise coupling. |
| REFGND-B (Pin 3) | Supply | Dedicated reference ground return for ADC_B - enables independent reference domains for dual-channel isolation. |
| REFIN-B (Pin 4) | Analog input | Reference voltage input for ADC_B; allows asymmetric reference configurations between channels. |
| AINM-B (Pin 5) | Analog input | Negative input for ADC_B; forms pseudo-differential pair with AINP-B (Pin 6). |
| AINP-B (Pin 6) | Analog input | Positive input for ADC_B; common-mode range tied to REFGND-B, not system GND. |
| DVDD (Pin 7) | Supply | Digital I/O supply (1.65–5.5 V); decoupling required near pin to suppress SPI interface noise. |
| GND (Pins 8, 13) | Supply | System ground connection points; thermal pad (Pin 16) must also connect to GND plane for thermal and EMI performance. |
| CS (Pin 9) | Digital input | Active-low chip select; initiates conversion frame and enables SDO-A/SDO-B outputs during read cycle. |
| SCLK (Pin 10) | Digital input | Serial clock input (up to 24 MHz); timing-critical path requiring controlled impedance and minimal skew. |
| SDO-A (Pin 11) | Digital output | Data output for ADC_A; MSB-first, 12-bit word aligned to SCLK falling edge per TI timing spec tD_CKDO. |
| SDO-B (Pin 12) | Digital output | Data output for ADC_B; independent stream enables parallel host processing of dual-channel results. |
| AINM-A (Pin 16) | Analog input | Negative input for ADC_A; paired with AINP-A (Pin 15) for differential voltage measurement. |
| AINP-A (Pin 15) | Analog input | Positive input for ADC_A; full-scale range = ±VREF when AINM-A = VREF, supporting bipolar signal capture. |
| AVDD (Pin 14) | Supply | Analog supply (4.5–5.5 V); powers internal SAR core and reference buffer - requires low-noise LDO and local 10-µF ceramic bypass. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous sampling | Two independent sample-and-hold circuits acquire AINP-A/AINM-A and AINP-B/AINM-B at identical instants - essential for phase-accurate three-phase current/voltage reconstruction. |
| Pseudo-differential inputs | Each ADC channel references its own REFGND_x, rejecting common-mode noise up to 74 dB dc–20 kHz without requiring matched external resistors. |
| Channel-to-channel isolation | –85 dB crosstalk at 15 kHz/25 kHz - prevents signal leakage between motor phase current and bus voltage measurements in shared PCB layouts. |
| Extended temperature rating | Specified from –40°C to +125°C with no derating - eliminates thermal margin uncertainty in industrial inverters and EV traction controllers. |
| Low-power dynamic operation | 45 mW total power at 750 kSPS (9 mA AVDD + 0.25 mA DVDD) - reduces thermal load in sealed enclosures and simplifies heatsinking. |
Applications
| Motor Control Position Feedback | Power Quality Monitoring |
|---|---|
Use Scenario: Sampling Sin/Cos encoder outputs in servo drives to compute absolute rotor angle via arctangent calculation. IC Role / Device Role / Timing Role: Dual ADC captures synchronized Sin and Cos analog amplitudes at precise intervals to resolve sub-degree angular position without interpolation delay. Use Value: Simultaneous sampling eliminates phase skew between channels, enabling <0.1° electrical angle error in high-speed PMSM commutation. | Use Scenario: Measuring voltage and current waveforms on all three phases of a grid-tied inverter for harmonic distortion and flicker analysis. IC Role / Device Role / Timing Role: Two ADCs digitize one voltage and one current channel per phase cycle, supporting IEEE 519-compliant THD and interharmonic reporting. Use Value: 73-dB SNR and –88-dB THD meet Class A accuracy requirements for IEC 61000-4-30 Ed. 3 power analyzers. |
| Protection Relay Sensing | Industrial PLC Analog Input Module |
Use Scenario: Detecting fault currents and voltages in medium-voltage switchgear to trigger trip logic within 10 ms. IC Role / Device Role / Timing Role: High-speed dual sampling captures pre-fault and post-fault transients across current transformer (CT) and potential transformer (PT) secondaries simultaneously. Use Value: 750-kSPS throughput resolves 50/60 Hz fundamental and first 12 harmonics with >20× oversampling for reliable RMS and peak detection. | Use Scenario: Providing isolated analog input channels in modular PLC backplanes for temperature, pressure, and flow sensor interfacing. IC Role / Device Role / Timing Role: ADC_A and ADC_B serve as independent 12-bit input channels per module slot, sharing SPI bus while maintaining channel isolation. Use Value: Pin-compatible family (ADS7250/ADS7850/ADS8350) allows hardware reuse across precision tiers without layout change. |
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 |
|---|---|---|---|
| ADS7850IRTER | 14-bit resolution, ±1.5 LSB INL, 81-dB SNR, same WQFN-16 package and pinout. | Higher precision for applications requiring <0.01% gain accuracy or extended harmonic analysis beyond 50th order. | Select ADS7850IRTER when ENOB > 13.3 is required and system clock jitter is <10 ps RMS. |
| ADS8350IRTER | 16-bit resolution, ±2.5 LSB INL, 85-dB SNR, identical pinout and timing interface. | Targeted at metrology-grade equipment needing >14-bit effective resolution and SFDR > 90 dB for low-level signal detection. | Choose ADS8350IRTER only if full-scale noise floor must remain below –100 dBFS and layout supports ultra-low-noise analog routing. |
Compared with ADS7850IRTER and ADS8350IRTER, the ADS7250IRTER provides optimal cost-performance balance for industrial motor control and protection relays where 12-bit resolution meets functional safety requirements (IEC 61800-5-2) without over-specifying SNR or INL.
Availability
ADS7250IRTER is available at Aetrix Electronics and suitable for motor control position feedback, power quality monitoring, protection relay sensing, and industrial PLC analog input modules requiring stable component supply across multi-year production cycles.
Supply support for ADS7250IRTER 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 headquartered in Dallas, Texas, designing and manufacturing analog ICs, embedded processors, and connectivity solutions for industrial, automotive, and consumer markets.
The ADSxx50 family - including ADS7250IRTER - was developed specifically for high-reliability industrial data acquisition systems requiring synchronized dual-channel sampling, extended temperature operation, and robust noise immunity in electrically noisy environments.
FAQ
What is the maximum clock frequency supported by the ADS7250IRTER?
The ADS7250IRTER supports a maximum SCLK frequency of 24 MHz, enabling full 12-bit data readout within the 750-kSPS throughput window. This timing aligns with tD_CKDO ≤ 20 ns and requires careful PCB layout to maintain signal integrity - especially for SCLK routing adjacent to analog traces. The ADS7250IRTER datasheet specifies tPH_CK and tPL_CK as 40%–60% of tCLK, confirming strict duty-cycle constraints.
Does the ADS7250IRTER require external reference components?
Yes, the ADS7250IRTER requires external reference voltage sources applied to REFIN-A and REFIN-B pins. It accepts 2.25 V to 2.5 V (or AVDD/2) with 300 µA input current per channel. A minimum 10-µF ceramic capacitor must be placed at each REFIN pin to stabilize the reference and suppress noise - TI recommends X7R dielectric with low ESR. No internal reference is provided.
How is channel-to-channel matching specified for the ADS7250IRTER?
The ADS7250IRTER specifies VOS match (±0.75 mV) and GERR match (±0.05%) between ADC_A and ADC_B over –40°C to +125°C. These parameters ensure consistent gain and offset behavior across both channels, critical for differential measurements like phase current imbalance detection. Matching is tested under identical conditions using the same reference and supply rails.
Can the ADS7250IRTER operate with a single 3.3-V supply?
No, the ADS7250IRTER requires two independent supplies: AVDD (4.5–5.5 V) for the analog core and DVDD (1.65–5.5 V) for digital I/O. Using only 3.3 V on AVDD violates the absolute maximum rating and degrades SNR and INL performance. TI specifies AVDD = 5 V and DVDD = 3.3 V in all AC/DC characterization data for ADS7250IRTER.
What is the purpose of the dual REFGND pins on the ADS7250IRTER?
The ADS7250IRTER includes separate REFGND-A and REFGND-B pins to isolate reference ground return paths for each ADC channel. This prevents noise coupling between channels and maintains CMRR >74 dB. TI's layout guidelines require routing each REFGND directly to the local reference capacitor ground, not daisy-chaining to system GND - a key requirement confirmed in the ADS7250IRTER datasheet Figure 10.
ADS7250IRTER 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):
- 750k
- Number of Inputs:
- 2
- Input Type:
- Pseudo-Differential
- Data Interface:
- SPI
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 2
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 1.65V ~ 5.5V
- Features:
- Simultaneous Sampling
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 16-WQFN (3x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS7250IRTER FAQ
1.How can I place an order for ADS7250IRTER through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7250IRTER 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 ADS7250IRTER reliable?
The price and inventory of ADS7250IRTER are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7250IRTER is usually 5 days.
3.What payment methods are accepted for ADS7250IRTER?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7250IRTER transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7250IRTER?
ADS7250IRTER orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7250IRTER 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 ADS7250IRTER?
For technical support, including ADS7250IRTER datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7250IRTER requirements.
6.How does Aetrix verify that ADS7250IRTER is sourced from the original manufacturer or authorized distributors?
All ADS7250IRTER 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 ADS7250IRTER meets industry standards.
7.What is the process for return or replacement of ADS7250IRTER?
All ADS7250IRTER units undergo pre-shipment inspection (PSI). If there is an issue with ADS7250IRTER, 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 ADS7250IRTER part is unused and in its original packaging.
Return procedure for ADS7250IRTER:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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