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Texas Instruments ADS7850IRTET
- Part No.:
- ADS7850IRTET
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
ADS7850IRTET.pdf
- Description:
- IC ADC 14BIT SAR 16WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,782
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Product details
Overview
ADS7850IRTET 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. It operates across –40°C to 125°C and is used in motor control position feedback loops requiring matched sampling of encoder sine/cosine signals.
For engineers reviewing the ADS7850IRTET datasheet, ADS7850IRTET pinout, ADS7850IRTET application, or ADS7850IRTET equivalent, this page delivers verified specifications, WQFN-16 package details, real-world use cases in protection relays and power quality measurement, and two validated alternative parts for design flexibility.
Technical Context
The ADS7850IRTET 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–AINM voltage differences referenced to REFGND_x, supporting flexible signal conditioning with external op-amps like OPA322.
It uses a simple 4-wire SPI-compatible serial interface (CS, SCLK, SDO-A, SDO-B) with no internal reference-requiring external VREFIN_A/VREFIN_B at 2.25 V to 2.5 V-and separates analog (AVDD = 5 V) and digital (DVDD = 3.3 V) supplies to minimize noise coupling between conversion and data transfer paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - delivers 16,384 distinct output codes for high-fidelity waveform capture in industrial sensing. |
| Sampling Rate | 750 kSPS - supports real-time monitoring of fast transients in three-phase power controls and protection relay trip logic. |
| INL (Max) | ±1.5 LSB - ensures <0.01% full-scale linearity error over temperature, critical for accurate RMS and harmonic analysis. |
| SNR | 81 dB - enables >13-bit effective resolution for clean digitization of low-amplitude sensor outputs in noisy factory environments. |
| Operating Temp | –40°C to 125°C - qualified for under-hood automotive ECUs and industrial motor drives without derating. |
| Package | WQFN-16 (3 mm × 3 mm) - compact thermally enhanced footprint with exposed pad for PCB heat dissipation in space-constrained designs. |
| Supply Voltages | AVDD = 5 V, DVDD = 3.3 V - dual-rail operation isolates analog precision from digital switching noise. |
Pinout & Package
ADS7850IRTET is housed in a 16-pin WQFN package (3 mm × 3 mm) with an exposed thermal pad recommended for connection to PCB ground to maintain junction temperature within specification during continuous 750-kSPS operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AINP-A / AINP-B | Positive analog input (ADC_A / ADC_B) | Accepts high-impedance voltage signals up to AVDD; paired with AINM for pseudo-differential measurement. |
| AINM-A / AINM-B | Negative analog input (ADC_A / ADC_B) | Serves as local reference for corresponding AINP; must be biased near VREFIN_x for optimal common-mode rejection. |
| REFIN-A / REFIN-B | External reference voltage input | Defines full-scale range (±VREF); requires stable 2.25–2.5 V source and ≥10 µF ceramic decoupling per channel. |
| REFGND-A / REFGND-B | Reference ground return | Provides dedicated low-noise return path for reference circuitry; must be routed separately from main GND to avoid CMRR degradation. |
| SDO-A / SDO-B | Serial data output (ADC_A / ADC_B) | 3-state CMOS outputs delivering 14-bit conversion results MSB-first on separate lines for simultaneous readout. |
| SCLK | Serial clock input | Accepts up to 24 MHz clock; falling edge latches data onto SDO lines with tD_CKDO ≤20 ns propagation delay. |
| CS | Chip-select input | Active-low enable; falling edge initiates conversion sequence, rising edge places SDO outputs in high-impedance state. |
| AVDD / DVDD | Analog / digital supply | Independent 5 V and 3.3 V rails reduce supply-induced crosstalk; AVDD powers SAR core and sample/hold. |
| GND (pins 8, 13) | Power ground | Common return for AVDD/DVDD; must be connected to REFx grounds via short, low-inductance traces. |
| Thermal Pad | Exposed die attach pad | Electrically connected to GND; soldering to large copper pour improves thermal resistance (RθJB = 7.3°C/W). |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous sampling | Two independent SAR cores acquire AINP-A/AINM-A and AINP-B/AINM-B at identical instants-critical for phase-angle accuracy in motor control and power metering. |
| Pseudo-differential inputs | Each ADC channel rejects common-mode noise up to 74 dB (dc–20 kHz), enabling robust measurements in electrically noisy industrial settings without full differential drivers. |
| Matched performance | ADC_A to ADC_B INL match ≤±1.5 LSB and offset match ≤±1 mV-ensures consistent gain/phase response across dual channels for vector calculations. |
| Extended temperature range | Specified from –40°C to 125°C with no performance degradation, eliminating need for thermal compensation in embedded motor drives or grid-edge inverters. |
| Low aperture jitter | 10 ps typical jitter preserves SNR at high input frequencies-essential for maintaining 81 dB SNR when digitizing 250-kHz signals in optical networking EDFA loops. |
Applications
| Motor Control Position Feedback | Protection Relay Analog Inputs |
|---|---|
Use Scenario: Capturing synchronized sine and cosine outputs from resolvers or SinCos encoders on servo motors to compute absolute angular position. IC Role / Device Role / Timing Role: Dual simultaneous ADC acquiring both encoder phases at 750 kSPS with matched latency and gain to preserve quadrature integrity. Use Value: Enables sub-0.1° angular resolution and real-time closed-loop control without interpolation artifacts caused by sampling skew. | Use Scenario: Digitizing current and voltage transformer outputs in IEC 61850-compliant digital relays for fault detection and tripping decisions. IC Role / Device Role / Timing Role: Simultaneously sampling phase currents and bus voltages to calculate instantaneous power, harmonics, and sequence components. Use Value: Provides time-aligned 14-bit data for accurate RMS, THD, and symmetrical component analysis required for Class 1.0 metering compliance. |
| Three-Phase Power Quality Monitoring | Industrial PLC Analog Input Modules |
Use Scenario: Measuring all three line-to-line voltages and corresponding phase currents in smart grid edge devices to detect flicker, imbalance, and harmonic distortion. IC Role / Device Role / Timing Role: Two ADS7850IRTET channels (or one device per pair) capturing synchronized voltage/current pairs for per-cycle power calculation. Use Value: Delivers 81 dB SNR and ±1.5 LSB INL to meet IEC 61000-4-30 Class A requirements for harmonic analysis up to 50th order. | Use Scenario: High-density analog input cards in programmable logic controllers acquiring sensor data (temperature, pressure, flow) across multiple field devices. IC Role / Device Role / Timing Role: Dual ADC providing isolated, time-aligned readings from two sensor signal chains with minimal board area (3 mm × 3 mm WQFN). Use Value: Reduces channel count per IC while maintaining 14-bit precision and extended temperature operation for uncooled cabinet installations. |
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 |
|---|---|---|---|
| ADS7250IRTET | 12-bit resolution, ±1 LSB max INL, 73-dB SNR, same WQFN-16 package and pinout. | Lower precision suits cost-sensitive motor control or basic power monitoring where 14-bit resolution is not required. | Select when system SNR budget allows ≥73 dB and linearity tolerance exceeds ±1 LSB-reduces BOM cost without layout change. |
| ADS8350IRTET | 16-bit resolution, ±2.5 LSB max INL, 85-dB SNR, identical pinout and timing interface. | Higher resolution supports demanding applications like high-fidelity audio test equipment or precision metrology requiring >13.5 ENOB. | Choose when measuring low-level signals (<100 mV) or performing FFT-based spectral analysis beyond 250 kHz with <0.005% distortion floor. |
Compared with ADS7250IRTET and ADS8350IRTET, the ADS7850IRTET 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 industrial motor drives and protection relays needing verified performance across –40°C to 125°C.
Availability
ADS7850IRTET is available at Aetrix Electronics and suitable for motor control position feedback, protection relay analog acquisition, and three-phase power quality monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADS7850IRTET 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 ADS7850IRTET-is designed for high-reliability industrial systems requiring simultaneous sampling, wide temperature operation, and robust noise immunity in motor control, energy infrastructure, and automation equipment.
FAQ
What is the maximum sampling rate of the ADS7850IRTET?
The ADS7850IRTET achieves a maximum sampling rate of 750 kSPS with simultaneous acquisition on both channels. This rate is sustained across the full operating temperature range (–40°C to 125°C) when using a 24-MHz SCLK and meeting recommended AVDD/DVDD supply conditions. Conversion time is fixed at 590 ns, enabling deterministic timing for real-time control loops.
Does the ADS7850IRTET include an internal voltage reference?
No, the ADS7850IRTET does not include an internal voltage reference. It requires external reference inputs (REFIN-A and REFIN-B) with a nominal voltage of 2.5 V (range: 2.25 V to AVDD/2). Each reference input must be decoupled with ≥10 µF ceramic capacitance, and corresponding REFGND-A/REFGND-B pins must be connected to low-noise ground planes to maintain specified INL and SNR performance.
What package type is used for the ADS7850IRTET?
The ADS7850IRTET is packaged in a 16-pin WQFN (RTE) with a 3 mm × 3 mm body and an exposed thermal pad. This package is pin-compatible with ADS7250IRTET and ADS8350IRTET, allowing direct substitution in existing layouts when resolution or SNR requirements change. The thermal pad must be soldered to a PCB ground plane to achieve the specified RθJB of 7.3°C/W.
How does the ADS7850IRTET handle simultaneous sampling of two channels?
The ADS7850IRTET uses two independent sample-and-hold circuits and SAR conversion cores that trigger simultaneously upon CS assertion. Aperture delay matching between ADC_A and ADC_B is guaranteed to ≤40 ps, ensuring phase coherence for time-critical applications like encoder position decoding and power vector calculations. Data is output on separate SDO-A and SDO-B lines to avoid inter-channel contention.
What are the supply voltage requirements for the ADS7850IRTET?
The ADS7850IRTET requires two separate supplies: AVDD = 4.5 V to 5.5 V (typically 5 V) for the analog core, and DVDD = 1.65 V to 5.5 V (typically 3.3 V) for digital I/O. These rails must be independently decoupled with 100-nF ceramic capacitors close to their respective pins. Maintaining separation prevents digital switching noise from degrading analog performance-especially critical for achieving 81-dB SNR.
ADS7850IRTET 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:
- -
ADS7850IRTET FAQ
1.How can I place an order for ADS7850IRTET through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7850IRTET 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 ADS7850IRTET reliable?
The price and inventory of ADS7850IRTET are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7850IRTET is usually 5 days.
3.What payment methods are accepted for ADS7850IRTET?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7850IRTET transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7850IRTET?
ADS7850IRTET orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7850IRTET 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 ADS7850IRTET?
For technical support, including ADS7850IRTET datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7850IRTET requirements.
6.How does Aetrix verify that ADS7850IRTET is sourced from the original manufacturer or authorized distributors?
All ADS7850IRTET 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 ADS7850IRTET meets industry standards.
7.What is the process for return or replacement of ADS7850IRTET?
All ADS7850IRTET units undergo pre-shipment inspection (PSI). If there is an issue with ADS7850IRTET, 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 ADS7850IRTET part is unused and in its original packaging.
Return procedure for ADS7850IRTET:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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