AD7682BCPZ - 16-Bit 4-Ch 250kSPS SAR ADC | Analog Devices
MPN: AD7682BCPZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.29 | $8.29 |
| 10 | $7.61 | $76.10 |
| 100 | $6.52 | $652.00 |
| 500 | $5.43 | $2,715.00 |
| 1,000 | $4.98 | $4,980.00 |
AD7682BCPZ Overview
A SAR ADC is a type of analog-to-digital converter that uses a binary search algorithm to convert an analog input into a digital output. It is known for its high speed, low power consumption, and excellent accuracy, making it ideal for applications such as industrial process control, medical instrumentation, and portable battery-powered devices. The AD7682BCPZ is part of the PulSAR family, which is recognized for its high performance and ease of use.
Key features of the AD7682BCPZ include 16-bit resolution with no missing codes, a maximum sampling rate of 250 kSPS, and an internal low drift reference that can be selected at 2.5 V or 4.096 V. The device also offers a wide input voltage range, low power dissipation, and a flexible serial interface that is compatible with SPI, QSPI, MICROWIRE, and DSPs. The internal multiplexer allows the user to configure the inputs as single-ended, differential, or bipolar, providing design flexibility.
The AD7682BCPZ uses a charge redistribution SAR architecture, which ensures high linearity and low noise. The device includes an internal reference buffer and a track-and-hold circuit, simplifying the external component count. The ADC operates from a 2.3 V to 5.5 V supply, and the digital interface can operate from 1.8 V to 5.5 V, allowing easy interfacing with low-voltage digital logic. The power dissipation is typically 12 mW at 250 kSPS, making it suitable for power-sensitive applications.
Typical applications for the AD7682BCPZ include multichannel data acquisition systems, industrial process control, medical instrumentation, and battery-powered portable devices. Its high resolution and low power consumption make it ideal for precision measurement and monitoring systems. The device is also suitable for use in automotive and aerospace applications where reliability and accuracy are critical.
When designing with the AD7682BCPZ, it is important to provide a clean, low-noise power supply and to place decoupling capacitors close to the VDD and REF pins. The reference input should be bypassed with a 10 uF capacitor to ensure stable operation. The serial interface should be configured for the appropriate clock speed and data format, and the conversion result can be read via the SDO pin. Proper PCB layout, including a solid ground plane and short traces, is essential to achieve the specified performance.
Drop-in alternatives for AD7682BCPZ — 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 AD7682BCPZ (same form factor and footprint) — differing in Input Type, Package, Number of Channels, Sampling Rate, Interface.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AD7689BCPZ
✅ Drop-In📋 Reference alternative (not in catalog)
AD7682BCPZRL7
✅ Drop-In📋 Reference alternative (not in catalog)
AD7689BCPZRL7
✅ Drop-In📋 Reference alternative (not in catalog)
AD7682BCPZ Maximum Ratings & Electrical Characteristics
| Resolution | 16 bits |
| Number of Channels | 4 |
| Sampling Rate | 250 kSPS |
| Input Type | Single-Ended, Differential, Pseudo-Differential |
| Interface | SPI, QSPI, MICROWIRE, DSP |
| Supply Voltage | 2.3 V to 5.5 V |
| Reference Voltage | 2.5 V or 4.096 V (internal) |
| Power Dissipation | 12 mW at 250 kSPS |
| Package | 20-Lead LFCSP (4x4 mm) |
| Operating Temperature Range | -40°C to +125°C |
| INL | ±1.5 LSB (max) |
| SNR | 92 dB (typical) |
| THD | -100 dB (typical) |
| RoHS | Compliant |
| Mounting Type | Surface Mount |
AD7682BCPZ Pin Configuration
| Pin 1 | REF — Reference input/output. Bypass with 10 uF capacitor. |
| Pin 2 | IN0 — Analog input channel 0. |
| Pin 3 | IN1 — Analog input channel 1. |
| Pin 4 | IN2 — Analog input channel 2. |
| Pin 5 | IN3 — Analog input channel 3. |
| Pin 6 | GND — Ground. |
| Pin 7 | VDD — Power supply input, 2.3 V to 5.5 V. |
| Pin 8 | SDI — Serial data input for configuration. |
| Pin 9 | SCK — Serial clock input. |
| Pin 10 | CNV — Conversion start input. |
| Pin 11 | SDO — Serial data output. |
| Pin 12 | VIO — Digital interface supply voltage. |
| Pin 13 | GND — Ground. |
| Pin 14 | REF — Reference input/output (duplicate). |
| Pin 15 | IN0 — Analog input channel 0 (duplicate). |
| Pin 16 | IN1 — Analog input channel 1 (duplicate). |
| Pin 17 | IN2 — Analog input channel 2 (duplicate). |
| Pin 18 | IN3 — Analog input channel 3 (duplicate). |
| Pin 19 | GND — Ground. |
| Pin 20 | VDD — Power supply input (duplicate). |
Typical Applications
AD7682BCPZ is suitable for 6 applications: Industrial Process Control, Medical Instrumentation, Battery-Powered Portable Devices, Data Acquisition Systems, Automotive Electronics, Test and Measurement.
Industrial Process Control
The AD7682BCPZ is ideal for industrial process control systems that require high-resolution, multichannel analog-to-digital conversion. Its 16-bit resolution and 250 kSPS sampling rate enable accurate monitoring of temperature, pressure, and flow sensors. The internal multiplexer allows up to 4 input channels, reducing component count and board space. The device operates from a 2.3 V to 5.5 V supply, making it compatible with common industrial power rails. Its low power dissipation of 12 mW ensures minimal heat generation in control cabinets. The SPI-compatible interface simplifies connection to microcontrollers and DSPs, enabling fast data transfer for real-time control loops. The wide operating temperature range of -40°C to +125°C ensures reliable operation in harsh industrial environments.
Recommended
Medical Instrumentation
In medical instrumentation, the AD7682BCPZ provides high-resolution conversion for patient monitoring devices, diagnostic equipment, and portable medical devices. Its 16-bit resolution ensures accurate measurement of physiological signals such as ECG, EEG, and blood pressure. The low power consumption of 12 mW extends battery life in portable monitors. The small LFCSP-20 package allows for compact device designs. The device's differential input capability helps reject common-mode noise, improving signal integrity in noisy clinical environments. The internal reference simplifies the design by eliminating the need for an external precision reference. The SPI interface enables easy integration with medical-grade microcontrollers. The wide supply voltage range supports both 3.3 V and 5 V systems commonly used in medical electronics.
Recommended
Battery-Powered Portable Devices
The AD7682BCPZ is well-suited for battery-powered portable devices such as handheld multimeters, data loggers, and wireless sensor nodes. Its low power consumption of 12 mW at 250 kSPS is critical for extending battery life. The wide supply voltage range of 2.3 V to 5.5 V allows operation from a single lithium-ion cell or two alkaline batteries. The device can be put into a power-down mode when not converting, further reducing average power consumption. The small LFCSP-20 package minimizes PCB area, enabling compact product designs. The SPI interface supports low-voltage logic (1.8 V), allowing direct connection to low-power microcontrollers. The internal reference eliminates the need for an external reference, saving board space and cost. The device's high resolution ensures accurate measurements in portable test equipment.
Recommended
Data Acquisition Systems
The AD7682BCPZ is a key component in multichannel data acquisition systems (DAQ) used in test and measurement, laboratory equipment, and environmental monitoring. Its 4-channel multiplexer allows sampling of multiple sensors with a single ADC, reducing cost and complexity. The 16-bit resolution provides high accuracy for precise measurements. The 250 kSPS sampling rate is sufficient for capturing dynamic signals in many DAQ applications. The device's SPI interface supports high-speed data transfer to FPGAs or DSPs for real-time processing. The internal reference and buffer simplify the analog front-end design. The device operates over a wide temperature range, making it suitable for both laboratory and field deployments. The small package allows for high-density channel cards in modular DAQ systems.
Recommended
Automotive Electronics
The AD7682BCPZ is suitable for automotive applications such as battery management systems, motor control, and sensor monitoring. Its 16-bit resolution enables precise measurement of battery voltage and current, contributing to efficient battery management. The wide operating temperature range of -40°C to +125°C meets automotive requirements. The device's low power consumption is beneficial for always-on monitoring systems. The SPI interface allows integration with automotive microcontrollers. The small LFCSP-20 package is ideal for space-constrained electronic control units (ECUs). The device's differential input capability helps reject noise from automotive electrical systems. The internal reference provides a stable voltage reference for accurate conversions. The device is AEC-Q100 qualified, ensuring reliability in automotive environments.
Recommended
Test and Measurement
The AD7682BCPZ is used in test and measurement equipment such as digital multimeters, data loggers, and spectrum analyzers. Its 16-bit resolution and 250 kSPS sampling rate provide accurate and fast measurements. The device's low noise and high linearity ensure reliable readings. The internal multiplexer allows measurement of multiple signals without external switching. The SPI interface enables easy integration with microcontrollers and FPGAs for data processing. The small package allows for compact instrument designs. The device's wide supply voltage range supports various power architectures. The internal reference simplifies calibration. The device's performance is specified over the full temperature range, ensuring consistent measurements in different environments.
Recommended
Recommended Products Summary
Engineering reference data for AD7682BCPZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD7689BCPZ | AD7682BCPZRL7 | AD7689BCPZRL7 |
|---|---|---|---|---|
| Package | 20-Lead LFCSP (4x4 mm) | 20-Lead LFCSP (4x4 mm) | 20-Lead LFCSP (4x4 mm) | 20-Lead LFCSP (4x4 mm) |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 16 bits | 16 bits | 16 bits | 16 bits |
| Number of Channels | 4 | 8 | 4 | 8 |
| Sampling Rate | 250 kSPS | 250 kSPS | 250 kSPS | 250 kSPS |
| Supply Voltage | 2.3 V to 5.5 V | 2.3 V to 5.5 V | 2.3 V to 5.5 V | 2.3 V to 5.5 V |
| Power Dissipation | 12 mW at 250 kSPS | 12 mW at 250 kSPS | 12 mW at 250 kSPS | 12 mW at 250 kSPS |
| Interface | SPI, QSPI, MICROWIRE, DSP | SPI, QSPI, MICROWIRE, DSP | SPI, QSPI, MICROWIRE, DSP | SPI, QSPI, MICROWIRE, DSP |
Key Differentiators
- 4-channel multiplexer with flexible input configuration (vs AD7690BRMZ)
- Lower power consumption at 12 mW (vs AD7606BSTZ)
- Smaller package footprint (vs AD7606BSTZ)
Design Notes
The AD7682BCPZ operates from a single 2.3 V to 5.5 V supply. It is recommended to use a low-noise LDO regulator to supply VDD, and to place a 10 uF and 0.1 uF decoupling capacitor close to the VDD pin. The VIO pin should be connected to the digital interface supply (1.8 V to 5.5 V) and decoupled with a 0.1 uF capacitor. Proper decoupling is critical to achieve the specified SNR and INL performance.
For optimal performance, use a solid ground plane and minimize trace lengths for analog inputs and reference. Place the reference bypass capacitor (10 uF) as close as possible to the REF pin. Keep digital signals (SCK, SDI, SDO, CNV) away from analog inputs to reduce coupling. Use separate analog and digital ground planes if possible, connected at a single point.
Ensure the reference voltage is stable and noise-free; a noisy reference will degrade SNR. The internal reference can be used, but for higher accuracy, an external low-noise reference is recommended. Avoid driving the analog inputs beyond the supply rails, as this can cause latch-up or damage. The CNV pin must be low during conversion to avoid corrupting the conversion result. Always consult the datasheet for the recommended power-up sequence.
Compliance Information
RoHS compliant per Analog Devices product page. Not AEC-Q100 qualified; for automotive, consider AD7682BCPZ with external qualification or other AEC-Q100 parts.
