AD4682BCPZ - 16-Bit 1MSPS Dual SAR ADC | Analog Devices
MPN: AD4682BCPZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $15.55 | $15.55 |
| 10 | $14.2 | $142.00 |
| 100 | $12.5 | $1,250.00 |
| 500 | $10.8 | $5,400.00 |
| 1,000 | $9.75 | $9,750.00 |
AD4682BCPZ Overview
An ADC (analog-to-digital converter) is a device that converts continuous analog signals into discrete digital values for processing by digital systems. SAR ADCs use a binary search algorithm to approximate the input voltage, offering a good balance of speed, resolution, and power consumption. The AD4682 is part of the data acquisition signal chain, bridging real-world analog signals to digital processors, microcontrollers, or DSPs.
Key features include a buffered internal 2.5 V reference, with the option to use an external reference up to 3.3 V. The device supports standard control inputs for easy interfacing with microprocessors and DSPs. It also features a pseudo differential input configuration, which rejects common-mode noise and simplifies front-end design. The dual-channel simultaneous sampling capability ensures accurate phase matching between two input signals, critical for applications like motor control and power monitoring.
Technically, the AD4682 employs a charge redistribution SAR architecture with a capacitive DAC, providing excellent linearity and low noise. The device includes a track-and-hold circuit that captures the input signal at the sampling instant, ensuring accurate conversion. The internal reference buffer reduces external component count, while the SPI-compatible serial interface allows high-speed data transfer. The device is specified for operation from -40°C to +125°C, making it suitable for industrial environments.
Typical applications include motor control, power line monitoring, data acquisition systems, and industrial automation. In motor control, the simultaneous sampling of current and voltage enables precise vector control algorithms. In power monitoring, the high resolution and speed allow accurate measurement of AC waveforms. The small package and low power consumption make it ideal for portable and embedded systems.
When designing with the AD4682, ensure that the reference voltage is stable and well-decoupled. Use a low-impedance source to drive the analog inputs to avoid sampling errors. The SPI interface should be properly terminated to minimize signal integrity issues. Consider the power supply noise and use appropriate filtering to achieve the specified performance.
Drop-in alternatives for AD4682BCPZ — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with AD4682BCPZ (same form factor and footprint) — differing in Input Type, Number of Inputs, Resolution, Sampling Rate.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AD4683BCPZ
✅ Drop-In✓ In Stock
$6.38 / Unit
View Datasheet →AD4682BCPZ Maximum Ratings & Electrical Characteristics
| Resolution | 16 Bit |
| Number of Inputs | 2 |
| Input Type | Pseudo Differential |
| Sampling Rate | 1 MSPS |
| Architecture | SAR |
| Supply Voltage | 3.0 V to 3.6 V |
| Internal Reference | 2.5 V buffered |
| External Reference Range | Up to 3.3 V |
| Interface | SPI |
| Package | 16-LFCSP (3x3 mm) |
| Operating Temperature Range | -40°C to +125°C |
| Mounting Type | Surface Mount |
| Number of Conversions | Simultaneous Sampling |
| RoHS Status | Compliant |
AD4682BCPZ Pin Configuration
| Pin 1 | AVDD — Analog power supply |
| Pin 2 | VIN+ — Positive analog input channel 1 |
| Pin 3 | VIN- — Negative analog input channel 1 |
| Pin 4 | GND — Ground |
| Pin 5 | VIN+ — Positive analog input channel 2 |
| Pin 6 | VIN- — Negative analog input channel 2 |
| Pin 7 | REF — Reference voltage input/output |
| Pin 8 | GND — Ground |
| Pin 9 | SCLK — Serial clock input |
| Pin 10 | SDI — Serial data input |
| Pin 11 | SDO — Serial data output |
| Pin 12 | CS — Chip select (active low) |
| Pin 13 | GND — Ground |
| Pin 14 | DVDD — Digital power supply |
| Pin 15 | GND — Ground |
| Pin 16 | EP — Exposed pad (thermal and ground) |
Typical Applications
AD4682BCPZ is suitable for 6 applications: Motor Control, Power Line Monitoring, Data Acquisition Systems, Industrial Automation, Medical Instrumentation, Test and Measurement.
Motor Control
The AD4682BCPZ's dual simultaneous sampling enables precise current and voltage measurement for vector control. With 16-bit resolution and 1 MSPS, it captures fast transients accurately. The pseudo differential inputs reject common-mode noise from motor drives, ensuring clean signals. Its small LFCSP package fits compact motor controllers, and the SPI interface simplifies connection to MCUs. The wide temperature range supports industrial motor environments.
Recommended
Power Line Monitoring
The AD4682BCPZ is ideal for power line monitoring due to its high resolution and simultaneous sampling of voltage and current. It can measure AC waveforms with 16-bit accuracy, enabling harmonic analysis and power quality assessment. The internal 2.5V reference simplifies design, while the SPI interface allows easy data transfer to a host processor. Its low power consumption is beneficial for distributed monitoring nodes.
Recommended
Data Acquisition Systems
In general-purpose data acquisition, the AD4682BCPZ provides high-speed, high-resolution conversion of analog signals. Its dual channels allow simultaneous sampling of two related signals, such as temperature and pressure. The pseudo differential input reduces noise, and the small package enables dense channel density. The SPI interface is compatible with most microcontrollers, making integration straightforward.
Recommended
Industrial Automation
The AD4682BCPZ is suitable for industrial automation applications such as process control and condition monitoring. Its wide temperature range and high reliability make it suitable for harsh environments. The simultaneous sampling capability is useful for correlating multiple sensor inputs. The internal reference reduces external component count, saving board space and cost.
Recommended
Medical Instrumentation
The AD4682BCPZ can be used in medical devices such as patient monitoring and diagnostic equipment. Its high resolution and low noise are critical for accurate biopotential measurements. The small package is suitable for portable devices. The SPI interface allows easy integration with medical-grade microcontrollers. The wide temperature range ensures reliable operation in clinical environments.
Recommended
Test and Measurement
The AD4682BCPZ is well-suited for test and measurement equipment such as oscilloscopes and data loggers. Its 1 MSPS sampling rate and 16-bit resolution allow accurate capture of fast signals. The dual simultaneous sampling enables comparison of two signals with precise timing. The internal reference and SPI interface simplify design, and the compact package is ideal for portable instruments.
Recommended
Recommended Products Summary
Engineering reference data for AD4682BCPZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD4683BCPZ | AD7682BCPZ | AD7980BCPZ-RL7 | AD7606BSTZ | ADS8568 |
|---|---|---|---|---|---|---|
| Package | 16-LFCSP (3x3 mm) | 16-LFCSP (3x3 mm) | 20-LFCSP | 10-MSOP | 64-LQFP | 64-TQFP |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Resolution | 16-bit | 16-bit | 16-bit | 16-bit | 16-bit | 16-bit |
| Sampling Rate | 1 MSPS | 500 kSPS | 250 kSPS | 1 MSPS | 200 kSPS | 510 kSPS |
| Number of Channels | 2 | 2 | 4 | 1 | 8 | 8 |
| Input Type | Pseudo Differential | Pseudo Differential | Pseudo Differential | Single-ended | Single-ended | Single-ended |
| Internal Reference | Yes (2.5V) | Yes (2.5V) | Yes (2.5V) | No | Yes (2.5V) | Yes (2.5V) |
| Interface | SPI | SPI | SPI | SPI | Parallel/SPI | Parallel/SPI |
Key Differentiators
- Dual simultaneous sampling at 1 MSPS (vs AD7682BCPZ)
- Pseudo differential input (vs AD7980BCPZ-RL7)
- Internal reference included (vs AD7980BCPZ-RL7)
Design Notes
Ensure that the AVDD and DVDD supplies are clean and well-decoupled. Use 0.1uF and 10uF capacitors close to the power pins. The reference voltage should be stable; if using the internal reference, place a 1uF decoupling capacitor on the REF pin. For external reference, ensure low output impedance and adequate drive capability.
Place the ADC close to the signal source to minimize trace length and reduce noise pickup. Use a solid ground plane and avoid routing digital signals under the analog input traces. For the exposed pad, solder it to the ground plane to improve thermal performance and reduce ground inductance.
The SPI interface should be designed with controlled impedance traces and proper termination to avoid reflections. Keep the SCLK trace short and avoid crossing analog signals. Use series resistors (e.g., 33 ohms) near the source to dampen ringing. Ensure that the CS signal is clean and glitch-free to prevent spurious conversions.
Compliance Information
RoHS compliant per Analog Devices product page. Other compliance data not specified in the provided data.