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Analog Devices Inc. AD4681BCPZ-RL7
- Part No.:
- AD4681BCPZ-RL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-WFQFN Exposed Pad, CSP
- Datasheet:
-
AD4681BCPZ-RL7.pdf
- Description:
- IC ADC 16BIT SAR 16LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:1,128
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Product details
Overview
AD4681BCPZ-RL7 from Analog Devices is a 16-bit, dual simultaneous sampling, differential-input SAR ADC optimized for high-precision motor control current sense and position feedback. It delivers 500 kSPS throughput, 92.5 dB SNR (VREF = 3.3 V), ±1.5 LSB INL max, and operates from −40°C to +125°C in a 3 mm × 3 mm LFCSP package.
For engineers reviewing the AD4681BCPZ-RL7 datasheet, AD4681BCPZ-RL7 pinout, AD4681BCPZ-RL7 application, or AD4681BCPZ-RL7 equivalent, key selection criteria include dual-channel synchronization timing, oversampling-enabled dynamic range enhancement, internal 2.5 V reference stability (10 ppm/°C), and compatibility with 1.8 V/2.5 V/3.3 V logic interfaces.
Technical Context
The AD4681BCPZ-RL7 implements two independent SAR cores with fully differential analog inputs (AINA±, AINB±), each sampled simultaneously on the falling edge of CS. Its on-chip oversampling block supports OSR up to 8×, delivering 100 dB dynamic range at RES = 1 without external processing.
It integrates a buffered 2.5 V internal reference (10 ppm/°C drift) and accepts external references from 2.5 V to 3.3 V via REFIO. The serial interface uses separate SDOA/SDOB outputs with ALERT functionality, supporting twos-complement output coding and configurable register access for resolution boost and threshold monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit native; supports resolution boost to 18-bit via oversampling (OSR = 4× or 8×) |
| Throughput Rate | 500 kSPS - fixed sample rate enabling deterministic timing for real-time control loops |
| SNR | 92.5 dB typical (VREF = 3.3 V) - enables >15 ENOB in noise-sensitive applications like EDFA monitoring |
| INL Error | ±1.5 LSB maximum - ensures monotonicity and accurate linearity across full industrial temperature range |
| Reference | 2.5 V internal (10 ppm/°C) or external 2.5–3.3 V - eliminates need for external reference in space-constrained designs |
| Power Dissipation | 21.9 mW max (500 kSPS, VCC = 3.6 V) - supports thermally constrained embedded systems |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive and industrial motor drive environments |
Pinout & Package
AD4681BCPZ-RL7 is housed in a 3 mm × 3 mm, 16-lead LFCSP (CP-16-451) with exposed pad (EPAD) requiring connection to GND for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 10 | GND | Primary ground reference for analog/digital circuitry; EPAD must be soldered to PCB ground plane |
| 2 | VLOGIC | Digital I/O supply (1.65–3.6 V); enables level-shifting for mixed-voltage microcontroller interfacing |
| 3 | REGCAP | Decoupling node for internal 1.9 V regulator; requires 1 µF capacitor to GND for stable core biasing |
| 4 | VCC | Analog power supply (3.0–3.6 V); decoupled with 1 µF capacitor to minimize switching noise coupling |
| 5, 6 | AINB−, AINB+ | Differential input pair for Channel B; supports wide common-mode range (0.2 V to VREF − 0.2 V) |
| 7, 8 | AINA−, AINA+ | Differential input pair for Channel A; matched aperture delay (<100 ps) ensures <0.01° phase error at 10 kHz |
| 9 | REFCAP | Bandgap reference decoupling node; requires 0.1 µF capacitor to stabilize 2.5 V reference output |
| 11 | REFIO | Reference I/O pin - sources internal 2.5 V or accepts external 2.5–3.3 V reference; mandatory decoupling |
| 12 | CS | Active-low chip select - initiates conversion and frames SPI data transfers; falling edge triggers sampling |
| 13 | SDOA | Serial data output A - provides conversion results for Channel A or register readback; CMOS-compatible |
| 14 | SDOB/ALERT | Configurable dual-function pin - outputs Channel B data or asserts low-level alert on threshold violation |
| 15 | SDI | Serial data input - writes configuration registers (CONFIGURATION1/2, ALERT thresholds) via SPI |
| 16 | SCLK | Serial clock input - supports up to 50 MHz SCLK; timing-critical for setup/hold compliance (tSDIS = 1 ns) |
Key Features
| Feature | Design Value |
|---|---|
| Dual simultaneous sampling | Guarantees sub-100 ps channel-to-channel aperture match for precise I/Q demodulation and motor phase alignment |
| On-chip oversampling (OSR) | Configurable 2×–8× OSR reduces noise floor by up to 9 dB and enables 100 dB dynamic range without FPGA post-processing |
| Resolution boost function | Increases effective resolution to 18-bit at OSR = 4×, improving position encoder resolution in servo drives |
| Alert function with programmable thresholds | Hardware-level overrange detection on either channel eliminates software polling latency in safety-critical current monitoring |
| Wide common-mode input range | 0.2 V to VREF − 0.2 V allows direct interface with op-amp drivers biased at mid-supply, simplifying signal conditioning |
Applications
| Motor Control Current Sense | Motor Control Position Feedback |
|---|---|
|
Use Scenario: Real-time phase current measurement in three-phase PMSM inverters using shunt resistors and differential amplifiers. IC Role / Device Role / Timing Role: Dual-channel synchronous sampling captures instantaneous A/B phase currents with <100 ps skew, enabling precise field-oriented control (FOC). Use Value: 500 kSPS throughput and 92.5 dB SNR support 16-bit current resolution at 20 kHz PWM frequencies, reducing torque ripple below 0.5%. |
Use Scenario: High-fidelity rotor position acquisition from resolvers or sine/cosine encoders in servo motor drives. IC Role / Device Role / Timing Role: Simultaneous sampling of resolver excitation and feedback signals preserves phase coherence for accurate angle computation. Use Value: ±1.5 LSB INL and 10 ppm/°C reference stability ensure <0.05° angular error over −40°C to +125°C, meeting SIL-2 functional safety requirements. |
| Sonar Signal Acquisition | Power Quality Monitoring |
|
Use Scenario: Digitizing echo return signals in underwater sonar transceivers with narrow pulse widths and high dynamic range. IC Role / Device Role / Timing Role: Oversampling mode (OSR = 8×) extends effective resolution to 18-bit, resolving weak echoes buried in amplifier noise. Use Value: 100 dB dynamic range at 500 kSPS enables detection of signals 100× smaller than full-scale without gain switching or AGC complexity. |
Use Scenario: Simultaneous voltage and current sampling in DIN-rail power analyzers for harmonic distortion analysis per IEC 61000-4-7. IC Role / Device Role / Timing Role: Dual-channel capture of line voltage and neutral current with synchronized timestamps supports true RMS and THD calculation. Use Value: 112 dB SFDR and −113 dB THD allow accurate 50th harmonic measurement (2.5 kHz) with <0.1% error in Class A metering applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD4680BCPZ-RL7 | Same pinout and architecture but rated for 1 MSPS throughput; higher power (33.7 mW) and reduced SNR (91 dB) at full speed | Better suited for high-bandwidth applications like ultrasound beamforming where >500 kSPS is required | Select AD4680BCPZ-RL7 only when system timing demands >500 kSPS; AD4681BCPZ-RL7 offers optimal power/performance trade-off for motor control |
| AD7381BCPZ-RL7 | 14-bit, 1 MSPS dual SAR ADC; no oversampling or resolution boost; lower SNR (86 dB) and wider INL (±2.5 LSB) | Targeted at cost-sensitive industrial PLCs where 14-bit resolution suffices for basic current/voltage monitoring | Choose AD7381BCPZ-RL7 for non-safety-critical applications with relaxed linearity and dynamic range requirements |
Compared with AD4680BCPZ-RL7, AD4681BCPZ-RL7 trades 500 kSPS throughput for 3.2 mW lower power and 1.5 dB higher SNR - critical for thermally constrained motor drives. Versus AD7381BCPZ-RL7, it adds 2 bits of resolution, 6.5 dB SNR, and hardware oversampling - enabling precision closed-loop control without external DSP.
Availability
AD4681BCPZ-RL7 is available at Aetrix Electronics and suitable for motor control position feedback, power quality monitoring, and sonar signal acquisition requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD4681BCPZ-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 AD4680/AD4681 product line was designed specifically for high-accuracy, dual-channel data acquisition in real-time control systems - emphasizing simultaneous sampling integrity, on-chip signal conditioning, and robust operation from −40°C to +125°C.
FAQ
What is the maximum sampling rate supported by the AD4681BCPZ-RL7?
The AD4681BCPZ-RL7 supports a fixed maximum throughput rate of 500 kSPS. This is specified in the datasheet under "Throughput" with test conditions confirming operation at −40°C to +125°C and no oversampling enabled. Attempting to exceed this rate results in invalid conversion data due to insufficient acquisition time (tACQUIRE = 1800 ns minimum).
Does the AD4681BCPZ-RL7 require an external reference voltage?
No, the AD4681BCPZ-RL7 includes a buffered 2.5 V internal reference with 10 ppm/°C temperature coefficient, accessible via the REFIO pin. An external reference (2.5 V to 3.3 V) is optional and used only when higher accuracy or lower noise than the internal reference is required - such as in metrology-grade power analyzers.
How does the oversampling function improve performance in the AD4681BCPZ-RL7?
The AD4681BCPZ-RL7's oversampling function averages multiple conversions to reduce quantization noise, increasing effective resolution and dynamic range. At OSR = 8×, it achieves 100 dB dynamic range and enables resolution boost to 18-bit, directly improving signal fidelity in applications like EDFA monitoring without external DSP resources.
Can the AD4681BCPZ-RL7 operate with a 1.8 V logic interface?
Yes, the AD4681BCPZ-RL7 supports 1.8 V, 2.5 V, and 3.3 V logic interfaces via its dedicated VLOGIC supply pin (Pin 2). Digital inputs (CS, SCLK, SDI) accept VIH ≥ 0.8 × VLOGIC and VIL ≤ 0.2 × VLOGIC, ensuring reliable operation with modern low-voltage microcontrollers while maintaining full analog performance.
What is the purpose of the SDOB/ALERT pin on the AD4681BCPZ-RL7?
The SDOB/ALERT pin on the AD4681BCPZ-RL7 is a dual-function terminal: it outputs Channel B conversion data during normal readback, or asserts a low-level hardware alert when configured thresholds (set via ALERT_LOW_THRESHOLD and ALERT_HIGH_THRESHOLD registers) are exceeded. This enables real-time fault detection without CPU intervention.
AD4681BCPZ-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:
- 16
- Sampling Rate (Per Second):
- 500k
- Number of Inputs:
- 2
- Input Type:
- Differential
- Data Interface:
- Serial
- Configuration:
- ADC
- Ratio - S/H:ADC:
- 0:2
- Number of A/D Converters:
- 2
- 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:
- -
AD4681BCPZ-RL7 FAQ
1.How can I place an order for AD4681BCPZ-RL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD4681BCPZ-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 AD4681BCPZ-RL7 reliable?
The price and inventory of AD4681BCPZ-RL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD4681BCPZ-RL7 is usually 5 days.
3.What payment methods are accepted for AD4681BCPZ-RL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD4681BCPZ-RL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD4681BCPZ-RL7?
AD4681BCPZ-RL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD4681BCPZ-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 AD4681BCPZ-RL7?
For technical support, including AD4681BCPZ-RL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD4681BCPZ-RL7 requirements.
6.How does Aetrix verify that AD4681BCPZ-RL7 is sourced from the original manufacturer or authorized distributors?
All AD4681BCPZ-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 AD4681BCPZ-RL7 meets industry standards.
7.What is the process for return or replacement of AD4681BCPZ-RL7?
All AD4681BCPZ-RL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD4681BCPZ-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 AD4681BCPZ-RL7 part is unused and in its original packaging.
Return procedure for AD4681BCPZ-RL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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