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Analog Devices Inc. AD7381BCPZ-RL7
- Part No.:
- AD7381BCPZ-RL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-WFQFN Exposed Pad, CSP
- Datasheet:
-
AD7381BCPZ-RL7.pdf
- Description:
- IC ADC 14BIT SAR 16LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:1,825
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Product details
Overview
AD7381BCPZ-RL7 from Analog Devices is a 14-bit, dual simultaneous sampling, 4 MSPS SAR analog-to-digital converter with fully differential inputs, 2.5 V internal reference, and operation from −40°C to +125°C. It delivers 85.4 dB SNR (VREF = 3.3 V), ±1.0 LSB INL max, and 100 ps aperture delay match for high-fidelity motor current sensing and position feedback.
For engineers reviewing the AD7381BCPZ-RL7 datasheet, AD7381BCPZ-RL7 pinout, AD7381BCPZ-RL7 application, or AD7381BCPZ-RL7 equivalent, this page provides verified technical context, real-world timing and noise performance, oversampling behavior, alert functionality, and validated alternative options for industrial control and power quality systems.
Technical Context
The AD7381BCPZ-RL7 implements two independent SAR ADC cores sharing a common clock and control interface, enabling true simultaneous sampling of two differential analog channels (AINA± and AINB±). Its on-chip oversampling block supports OSR up to 16× with resolution boost enabled, delivering up to 94.5 dB SNR at reduced output data rate.
It uses a buffered 2.5 V internal reference or accepts external references from 2.49 V to 3.4 V, with dedicated REFIO, REFCAP, and REGCAP pins. The serial interface operates with 1.65 V–3.6 V logic supply (VLOGIC), supports 2-wire mode, and includes CRC error detection, register access, and ALERT threshold monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - guarantees monotonic transfer function and no missing codes across full temperature range. |
| Throughput Rate | 4 MSPS - enables real-time capture of fast transients in motor phase currents or power line harmonics. |
| SNR (typical) | 85.4 dB at 1 kHz, VREF = 3.3 V - defines dynamic range for low-noise signal reconstruction in precision acquisition. |
| INL (max) | ±1.0 LSB - ensures accurate amplitude fidelity for closed-loop control feedback paths. |
| Aperture Delay Match | 100 ps - maintains channel-to-channel timing alignment critical for I/Q demodulation and vector control. |
| Oversampling Ratio | Up to 16× - reduces effective noise floor by up to 12 dB and relaxes anti-alias filter requirements. |
| Operating Temperature | −40°C to +125°C - supports under-hood automotive, industrial drive, and harsh-environment deployment. |
Pinout & Package
AD7381BCPZ-RL7 is housed in a 16-lead LFCSP package (3 mm × 3 mm) with exposed pad requiring connection to GND for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 10) | Ground reference | Common return for analog, digital, and reference circuitry; exposed pad must be soldered to PCB ground plane. |
| VLOGIC (Pin 2) | Logic interface supply | Independent 1.65 V–3.6 V rail decoupled with 1 µF capacitor; enables level-shifting with 1.8 V/2.5 V/3.3 V controllers. |
| REGCAP (Pin 3) | Internal regulator decoupling | Stabilizes internal 1.9 V regulator output; requires 1 µF capacitor to GND for stable digital core operation. |
| VCC (Pin 4) | Analog/digital power supply | 3.0 V–3.6 V main supply; decoupling with 1 µF capacitor minimizes switching noise coupling into ADC core. |
| AINB−/AINB+ (Pins 5, 6) | Differential input B | High-Z, wide common-mode (0.2 V to VREF − 0.2 V) inputs optimized for current-sense amplifier outputs. |
| AINA−/AINA+ (Pins 7, 8) | Differential input A | Matched to AINB± for <100 ps aperture delay skew; supports simultaneous sampling of dual motor phases. |
| REFIO (Pin 11) | Reference I/O | Configurable as 2.5 V reference output or 2.49 V–3.4 V external reference input; requires 1 µF decoupling. |
| CS (Pin 12) | Chip select | Active-low conversion trigger and SPI frame sync; falling edge initiates acquisition and readback sequence. |
| SDOA (Pin 13) | Data output A | Tri-state serial output for ADC A results or register reads; supports daisy-chain or multiplexed host interfaces. |
| SDOB/ALERT (Pin 14) | Data output B / Alert | Configurable dual-function pin: outputs ADC B data or asserts low when conversion exceeds user-defined thresholds. |
| SDI (Pin 15) | Serial data input | Accepts register writes (CONFIGURATION1/2, ALERT thresholds); setup/hold times defined for 1.65 V–3.6 V logic. |
| SCLK (Pin 16) | Serial clock | Up to 80 MHz clock input; timing parameters guarantee reliable 16-bit read/write at 4 MSPS throughput. |
Key Features
| Feature | Design Value |
|---|---|
| Dual simultaneous sampling | Two independent SAR cores sample AINA± and AINB± on same CS edge-enables precise phase difference measurement without inter-channel skew. |
| On-chip oversampling (OSR up to 16×) | Reduces effective noise by up to 12 dB and improves SNR to 94.5 dB; eliminates need for external digital filtering in many applications. |
| Alert function with programmable thresholds | Pin 14 (SDOB/ALERT) asserts low within 200 ns of threshold violation-enables real-time fault response without host polling overhead. |
| Wide common-mode input range (0.2 V to VREF − 0.2 V) | Supports direct interfacing with isolated amplifiers and shunt-based current sensors operating near rail limits. |
| 16-lead 3 mm × 3 mm LFCSP | Space-constrained designs benefit from minimal footprint and integrated thermal pad-reduces board area vs. QFN alternatives. |
Applications
| Motor Control Current Sense | Motor Control Position Feedback |
|---|---|
Use Scenario: Real-time sampling of dual-phase motor currents in field-oriented control (FOC) drives operating at 20 kHz PWM frequency. IC Role / Device Role / Timing Role: Simultaneous acquisition of AINA± and AINB± ensures zero phase offset between current measurements for accurate torque calculation. Use Value: 100 ps aperture delay match preserves vector angle integrity; 4 MSPS throughput captures current ripple without aliasing. |
Use Scenario: High-resolution angular position tracking using resolver or encoder sine/cosine outputs in servo actuators. IC Role / Device Role / Timing Role: Dual ADC channels digitize resolver excitation and feedback signals synchronously for Lissajous ellipse computation. Use Value: 14-bit resolution and 85.4 dB SNR enable sub-arcminute position resolution; oversampling suppresses PWM-induced noise. |
| Power Quality Monitoring | Erbium-Doped Fiber Amplifier (EDFA) |
Use Scenario: Continuous 3-phase voltage/current acquisition in smart grid meters detecting harmonics up to 50th order. IC Role / Device Role / Timing Role: Simultaneous sampling across multiple channels ensures coherent phasor calculation for IEEE 1459 compliance. Use Value: Channel-to-channel isolation >110 dB prevents crosstalk between phases; 4 MSPS supports 100 kHz Nyquist bandwidth. |
Use Scenario: Closed-loop bias current control of EDFA pump lasers requiring stable optical gain under thermal drift. IC Role / Device Role / Timing Role: Digitizes photodiode monitor outputs and thermistor readings for dual-loop feedback in compact optical modules. Use Value: −40°C to +125°C rating ensures reliability in uncooled EDFA housings; 2.5 V internal reference eliminates external component count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel, high-speed SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7380BCPZ-RL7 | 16-bit resolution, identical pinout and timing; 92.5 dB SNR (VREF = 3.3 V), 2.0 LSB INL max. | Required where higher amplitude accuracy is needed (e.g., calibration-grade DAQ), but consumes ~10% more power at 4 MSPS. | Select AD7380BCPZ-RL7 only if system SNR budget demands >92 dB and INL tolerance is ≤2 LSB. |
| ADS8900BRGER | 16-bit, 1 MSPS, single-channel, SPI interface; no oversampling; 93 dB SNR, 1.5 LSB INL; 20-pin VQFN. | Lacks simultaneous dual-channel capability and alert function; suitable for lower-throughput, space-tolerant designs with simpler signal chains. | Choose ADS8900BRGER only when dual sampling is unnecessary and layout allows larger 20-pin package with separate channel sequencing. |
Compared with AD7381BCPZ-RL7, AD7380BCPZ-RL7 trades resolution for dynamic range while maintaining identical timing and feature set, whereas ADS8900BRGER sacrifices channel count, oversampling, and alert capability for lower cost and simpler interface-neither is pin-compatible nor drop-in.
Availability
AD7381BCPZ-RL7 is available at Aetrix Electronics and suitable for motor control current sense, power quality monitoring, and EDFA bias control requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD7381BCPZ-RL7 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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The AD7380/AD7381 family was designed specifically for high-accuracy, high-speed simultaneous sampling in demanding real-time control systems-emphasizing timing precision, noise immunity, and robust operation from −40°C to +125°C.
FAQ
What is the maximum oversampling ratio supported by the AD7381BCPZ-RL7?
The AD7381BCPZ-RL7 supports oversampling ratios up to 16× in both normal average and rolling average modes. With resolution boost enabled, OSR = 16 delivers 94.5 dB SNR and effectively increases usable resolution beyond 14 bits for bandwidth-limited signals-verified in Figure 21 of the AD7380/AD7381 Rev. A datasheet.
Does the AD7381BCPZ-RL7 require an external reference voltage?
No, the AD7381BCPZ-RL7 includes a buffered 2.5 V internal reference with ±10 ppm/°C temperature coefficient and 7 μV rms noise. An external reference (2.49 V–3.4 V) may be used via the REFIO pin for improved accuracy or system-level reference sharing-but it is not required for basic operation of the AD7381BCPZ-RL7.
How does the ALERT function operate on the AD7381BCPZ-RL7?
The ALERT function on the AD7381BCPZ-RL7 uses Pin 14 (SDOB/ALERT) to assert low within 200 ns of a conversion result exceeding user-programmed high or low thresholds stored in ALERT_HIGH_THRESHOLD and ALERT_LOW_THRESHOLD registers. This hardware interrupt eliminates software polling latency and enables immediate fault response in safety-critical motor control systems.
What is the aperture delay match specification for the AD7381BCPZ-RL7?
The AD7381BCPZ-RL7 specifies aperture delay match of ≤100 ps (maximum) between its two ADC channels (ADC A and ADC B). This tight matching ensures sub-degree phase alignment in I/Q demodulation and vector-controlled motor drives-critical for accurate torque and flux estimation in real-time control loops.
Can the AD7381BCPZ-RL7 interface directly with a 1.8 V microcontroller?
Yes, the AD7381BCPZ-RL7 supports 1.65 V–3.6 V logic levels on VLOGIC, allowing direct interface with 1.8 V microcontrollers. The SCLK, SDI, CS, SDOA, and SDOB/ALERT pins meet 1.8 V logic thresholds (VIH = 0.8 × VLOGIC, VIL = 0.2 × VLOGIC), and IVLOGIC remains below 3.7 mA during operation-confirmed in Table 3 and Table 4 of the AD7380/AD7381 datasheet.
AD7381BCPZ-RL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad, CSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 14
- Sampling Rate (Per Second):
- 4M
- Number of Inputs:
- 2
- Input Type:
- Differential
- Data Interface:
- Serial
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- -
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 3V ~ 3.6V
- Voltage - Supply, Digital:
- 1.65V ~ 3.6V
- Features:
- Simultaneous Sampling
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 16-LFCSP (3x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7381BCPZ-RL7 FAQ
1.How can I place an order for AD7381BCPZ-RL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7381BCPZ-RL7 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 AD7381BCPZ-RL7 reliable?
The price and inventory of AD7381BCPZ-RL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7381BCPZ-RL7 is usually 5 days.
3.What payment methods are accepted for AD7381BCPZ-RL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7381BCPZ-RL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7381BCPZ-RL7?
AD7381BCPZ-RL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7381BCPZ-RL7 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 AD7381BCPZ-RL7?
For technical support, including AD7381BCPZ-RL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7381BCPZ-RL7 requirements.
6.How does Aetrix verify that AD7381BCPZ-RL7 is sourced from the original manufacturer or authorized distributors?
All AD7381BCPZ-RL7 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 AD7381BCPZ-RL7 meets industry standards.
7.What is the process for return or replacement of AD7381BCPZ-RL7?
All AD7381BCPZ-RL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7381BCPZ-RL7, 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 AD7381BCPZ-RL7 part is unused and in its original packaging.
Return procedure for AD7381BCPZ-RL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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