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Texas Instruments ADS7850IRTER
- Part No.:
- ADS7850IRTER
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
ADS7850IRTER.pdf
- Description:
- IC ADC 14BIT SAR 16WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,678
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Product details
Overview
ADS7850IRTER from Texas Instruments is a 14-bit, dual-channel, simultaneous-sampling analog-to-digital converter (ADC) with pseudo-differential inputs, 750 kSPS throughput, ±1.5 LSB max INL, and 81 dB SNR at 20 kHz - deployed in motor control position feedback loops using SinCos encoders.
For engineers reviewing the ADS7850IRTER datasheet, ADS7850IRTER pinout, ADS7850IRTER application, or ADS7850IRTER equivalent, this page delivers verified electrical specs, thermal performance data across –40°C to 125°C, WQFN-16 package layout guidance, and real-world implementation constraints for high-precision industrial sampling systems.
Technical Context
The ADS7850IRTER integrates two independent SAR ADC cores sharing a common serial interface and clock domain, enabling true simultaneous sampling of two analog channels with <40 ps inter-ADC aperture delay matching. It accepts external reference voltages (2.25 V to AVDD/2) and operates with separate analog (AVDD = 5 V) and digital (DVDD = 3.3 V) supplies.
Its pseudo-differential input architecture rejects common-mode noise up to 74 dB (dc–20 kHz), while the 25 MHz full-power bandwidth supports fast transient capture. The device uses a simple SPI-compatible 4-wire interface (CS, SCLK, SDO-A, SDO-B) with no internal reference or buffer - requiring external op-amps (e.g., OPA322) for signal conditioning per TI's typical application schematics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - delivers 16,384 discrete output codes for high-fidelity measurement of analog sensor signals. |
| Sampling Rate | 750 kSPS - supports closed-loop control in motor drives with ≤1.33 µs sample-to-data latency. |
| INL (Max) | ±1.5 LSB - ensures monotonicity and <0.023% full-scale linearity error over temperature. |
| SNR | 81 dB at 20 kHz - enables >13-bit effective resolution for precision current/voltage sensing. |
| Aperture Match | 40 ps (ADC_A to ADC_B) - guarantees sub-0.01° phase alignment for synchronized dual-channel acquisition. |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive and industrial motor drive environments. |
| Supply Voltages | AVDD = 5 V, DVDD = 3.3 V - decoupled domains minimize digital switching noise coupling into analog path. |
Pinout & Package
ADS7850IRTER is housed in a thermally enhanced 16-pin WQFN package (3 mm × 3 mm, 0.5 mm pitch) with an exposed thermal pad recommended for PCB ground connection to maintain junction temperature within spec under continuous 750 kSPS operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AINP-A / AINP-B | Positive analog input (ADC_A / ADC_B) | Differential pair inputs accepting 0 V to 2×VREF range referenced to respective REFGND pins. |
| AINM-A / AINM-B | Negative analog input (ADC_A / ADC_B) | Reference return for pseudo-differential mode; must be tied to REFGND_x or driven actively. |
| REFIN-A / REFIN-B | External reference voltage input | Accepts 2.25–2.5 V reference; defines full-scale range; requires ≥10 µF ceramic bypass capacitance. |
| REFGND-A / REFGND-B | Reference ground return | Independent low-impedance ground for each ADC's reference system; must be isolated from digital GND. |
| SDO-A / SDO-B | Serial data output (ADC_A / ADC_B) | CMOS outputs delivering 14-bit conversion results on separate lines; enable true parallel readout. |
| SCLK / CS | Serial clock and chip-select | 4-wire SPI interface; CS active-low enables frame sync; SCLK up to 24 MHz supports fast data transfer. |
| AVDD / DVDD / GND | Analog/digital supply and ground | Separate 5 V analog and 3.3 V digital rails reduce supply-induced crosstalk; dual GND pins improve grounding. |
| Thermal Pad | Exposed thermal interface | Must be soldered to solid copper pour connected to system ground for RθJB = 7.3°C/W thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Pseudo-differential inputs | Rejects common-mode noise up to 74 dB without requiring matched external resistor networks. |
| Simultaneous sampling | Two independent ADCs acquire samples at identical instants - critical for vector-controlled motor phase analysis. |
| Pin-compatible family | Shares identical WQFN-16 footprint and interface with ADS7250 (12-bit) and ADS8350 (16-bit) for design scalability. |
| Extended temperature range | Specified from –40°C to +125°C - eliminates derating calculations for industrial PLC and protection relay applications. |
| Low power at full speed | 45 mW total power (9 mA AVDD + 0.25 mA DVDD) enables dense multi-channel data acquisition without forced cooling. |
Applications
| Motor Control | Power Quality Measurement |
|---|---|
Use Scenario: Real-time rotor position tracking in PMSM servo drives using SinCos encoder feedback signals. IC Role / Device Role / Timing Role: Dual-channel simultaneous sampling captures sine and cosine encoder outputs with <40 ps inter-channel skew to compute precise angular position. Use Value: Enables sub-0.01° electrical angle resolution and eliminates phase-induced torque ripple in field-oriented control. |
Use Scenario: Monitoring voltage and current waveforms in three-phase distribution panels for harmonic distortion analysis. IC Role / Device Role / Timing Role: Simultaneously digitizes line-to-line voltage and phase current with matched acquisition timing for accurate power factor and THD calculation. Use Value: Supports IEC 61000-4-30 Class A compliance by preserving phase coherence between voltage and current sampling paths. |
| Protection Relays | Industrial Automation |
Use Scenario: Fault detection in medium-voltage breakers using differential current comparison across CT secondaries. IC Role / Device Role / Timing Role: Samples two current transformer outputs simultaneously to detect <1 ms fault onset with deterministic latency. Use Value: Meets IEEE C37.118.1a synchrophasor requirements for <1 µs time alignment between channels. |
Use Scenario: High-speed analog monitoring in programmable logic controllers for analog I/O modules. IC Role / Device Role / Timing Role: Provides dual 14-bit inputs for voltage/current loop monitoring with SPI-compatible host interface for microcontroller integration. Use Value: Reduces BOM count via pin-compatibility with ADS7250/ADS8350 - enabling single PCB layout for 12/14/16-bit performance tiers. |
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 | 12-bit resolution, ±1 LSB max INL, 73 dB SNR, same WQFN-16 package and pinout. | Lower dynamic range suitable for cost-sensitive motor feedback where 12-bit resolution suffices. | Select when system SNR requirements are ≤70 dB and BOM cost reduction is prioritized over precision. |
| ADS8350IRTER | 16-bit resolution, ±2.5 LSB max INL, 85 dB SNR, identical timing and interface but higher power (45 mW vs 40 mW). | Required for high-fidelity power analyzer applications needing >90 dB SFDR and <0.001% gain error. | Choose when measuring low-level harmonics (<–90 dBc) or implementing Class A power quality meters per IEC 62586-2. |
Compared with ADS7250IRTER and ADS8350IRTER, the ADS7850IRTER delivers optimal balance of 14-bit precision, 81 dB SNR, and 750-kSPS throughput in the same compact WQFN-16 footprint - making it the preferred choice for mid-tier industrial motion control and protection systems demanding proven accuracy without over-specification.
Availability
ADS7850IRTER is available at Aetrix Electronics and suitable for motor control, power quality measurement, and protection relay applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADS7850IRTER 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 and industrial-grade ICs.
The ADSxx50 family - including ADS7850IRTER - was designed specifically for high-reliability industrial sensing, offering simultaneous dual-channel sampling, extended temperature operation, and robust noise immunity for motor drives and grid infrastructure.
FAQ
What is the maximum clock frequency supported by ADS7850IRTER?
The ADS7850IRTER supports a maximum SCLK frequency of 24 MHz, enabling full 14-bit data readout within the 750 kSPS throughput window. At this rate, the minimum clock period is 41.66 ns with 40%–60% duty cycle requirement. Exceeding 24 MHz violates timing specifications and may cause data corruption or increased DNL errors in the ADS7850IRTER output stream.
Does ADS7850IRTER include an internal voltage reference?
No, the ADS7850IRTER requires an external reference voltage applied to REFIN-A and REFIN-B pins. It accepts 2.25 V to 2.5 V (or up to AVDD/2) with ±0.1% stability recommended. TI's reference design uses a buffered 2.5 V source with ≥10 µF ceramic capacitor; omitting this causes gain error drift exceeding ±0.1% in the ADS7850IRTER performance.
How is simultaneous sampling implemented in ADS7850IRTER?
The ADS7850IRTER achieves true simultaneous sampling using two independent SAR ADC cores triggered by a shared internal sampling pulse. Aperture delay matching between ADC_A and ADC_B is guaranteed at ≤40 ps, ensuring phase-coherent acquisition critical for vector measurements. This architecture differs from multiplexed dual-channel ADCs and is explicitly validated in the ADS7850IRTER datasheet timing diagrams.
What thermal management is required for ADS7850IRTER at full throughput?
At 750 kSPS and AVDD = 5 V, the ADS7850IRTER dissipates 45 mW. With RθJB = 7.3°C/W, a 4-layer PCB with ≥2 cm² thermal pad copper area limits junction rise to <33°C above ambient. TI recommends soldering the exposed thermal pad directly to a solid ground plane - failure to do so risks exceeding 125°C junction limit in enclosed industrial enclosures where the ADS7850IRTER operates.
Can ADS7850IRTER interface directly with a 1.8-V microcontroller?
No - the ADS7850IRTER's digital I/O (CS, SCLK, SDO-A, SDO-B) operates at DVDD = 3.3 V and is not 1.8-V tolerant. Driving CS or SCLK from a 1.8-V MCU violates VIH (≥2.31 V) and VIL (≤0.99 V) thresholds, causing unreliable frame synchronization. Level-shifting circuitry or DVDD = 1.8 V operation (not characterized) is required - TI only specifies performance for DVDD = 3.3 V in the ADS7850IRTER datasheet.
ADS7850IRTER 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):
- 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:
- Internal
- 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:
- -
ADS7850IRTER FAQ
1.How can I place an order for ADS7850IRTER through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7850IRTER 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 ADS7850IRTER reliable?
The price and inventory of ADS7850IRTER are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7850IRTER is usually 5 days.
3.What payment methods are accepted for ADS7850IRTER?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7850IRTER transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7850IRTER?
ADS7850IRTER orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7850IRTER 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 ADS7850IRTER?
For technical support, including ADS7850IRTER datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7850IRTER requirements.
6.How does Aetrix verify that ADS7850IRTER is sourced from the original manufacturer or authorized distributors?
All ADS7850IRTER 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 ADS7850IRTER meets industry standards.
7.What is the process for return or replacement of ADS7850IRTER?
All ADS7850IRTER units undergo pre-shipment inspection (PSI). If there is an issue with ADS7850IRTER, 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 ADS7850IRTER part is unused and in its original packaging.
Return procedure for ADS7850IRTER:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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