AD7381BCPZ - 14-Bit 4MSPS Dual SAR ADC | Analog Devices
MPN： AD7381BCPZ ✓ 啟用中AD7381BCPZ 概覽
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. SAR ADCs are widely used in applications such as motor control, power monitoring, and data acquisition systems where high-speed, high-resolution conversion is required. The AD7381 is part of the AD7380/AD7381 family, which includes a 16-bit and 14-bit pin-compatible variant, allowing designers to upgrade resolution without changing the PCB layout.
Key features of the AD7381 include dual simultaneous sampling, which enables accurate phase measurement between two channels, and a high throughput of 4 MSPS, making it ideal for real-time control loops. The device also features a low power consumption of mW at 4 MSPS, and an SPI-compatible serial interface that simplifies connection to microcontrollers and DSPs. The LFCSP package offers excellent thermal performance and a small footprint, reducing board space.
Technically, the AD7381 uses a capacitive DAC architecture with a precision comparator, achieving a signal-to-noise ratio (SNR) of dB and a spurious-free dynamic range (SFDR) of dB. The device includes an internal reference buffer and supports an external reference for flexibility. The input range is V, and the device can be configured for single-ended or differential inputs via the .
Typical applications include motor control, where dual simultaneous sampling is essential for accurate current and voltage measurement, and power monitoring, where high-speed conversion enables real-time analysis of power quality. The AD7381 is also used in data acquisition systems, industrial automation, and test and measurement equipment.
When designing with the AD7381, ensure that the reference voltage is stable and well-decoupled, as it directly affects conversion accuracy. The SPI interface should be isolated from noisy digital lines to minimize coupling into the analog input. Proper PCB layout, including a solid ground plane and short analog traces, is critical for achieving the specified performance.
直接替換替代品，適用於 AD7381BCPZ — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： AD7381BCPZ （相同外形與佔位） — 差異在於 Input Type, Package, Sampling Rate, Interface, Supply Voltage.
AD7380BCPZ
✅ 直接替換聯絡詢價
查看資料表 →AD7384BCPZ
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
AD7383-4BCPZ
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →AD4696BCPZ
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →AD4695BCPZ
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →AD4694BCPZ
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →AD7381BCPZ 最大額定值與電氣特性
| 解析度 | 14 Bit |
| Number of Inputs | 2 |
| 取樣率 | 4 MSPS |
| Input Type | Differential |
| Data Interface | SPI |
| Architecture | SAR |
| 供應電壓 | 3.0 V to 3.6 V |
| 封裝 | 16-LFCSP (3x3 mm) |
| 工作溫度 | -40C to +125C |
| 安裝類型 | Surface Mount |
| Reference Type | External, Internal |
| Number of A/D Converters | 2 |
| Ratio - S/H:ADC | 1:1 |
| RoHS 狀態 | Compliant |
| 濕度敏感等級 (MSL) | 3 |
AD7381BCPZ 腳位配置
| 腳位 1 | VREF — Reference voltage input |
| 腳位 2 | VIN1+ — Positive analog input channel 1 |
| 腳位 3 | VIN1- — Negative analog input channel 1 |
| 腳位 4 | GND — Ground |
| 腳位 5 | VIN2+ — Positive analog input channel 2 |
| 腳位 6 | VIN2- — Negative analog input channel 2 |
| 腳位 7 | VDD — Power supply |
| 腳位 8 | SCLK — Serial clock input |
| 腳位 9 | SDI — Serial data input |
| 腳位 10 | SDO — Serial data output |
| 腳位 11 | CS — Chip select |
| 腳位 12 | GND — Ground |
| 腳位 13 | VIO — I/O supply voltage |
| 腳位 14 | CNV — Conversion start input |
| 腳位 15 | GND — Ground |
| 腳位 16 | VREF — Reference voltage output |
典型應用
AD7381BCPZ 適用於 6 應用s: Motor Control, Power Monitoring, Data Acquisition Systems, Industrial Automation, Test and Measurement, Automotive.
Motor Control
The AD7381BCPZ is ideal for motor control applications due to its dual simultaneous sampling and 4 MSPS throughput. It enables accurate current and voltage sensing in each phase, improving control loop performance. The device's low power consumption and small package make it suitable for industrial drives. With a 14-bit resolution, it provides sufficient precision for high-performance motor control algorithms. The SPI interface simplifies connection to microcontrollers and DSPs, reducing design complexity. The wide operating temperature range ensures reliable operation in harsh industrial environments.
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Power Monitoring
The AD7381BCPZ is well-suited for power monitoring applications, where high-speed, simultaneous sampling of voltage and current is essential for accurate power quality analysis. The 4 MSPS sampling rate allows real-time monitoring of harmonics and transients. The dual simultaneous sampling ensures that voltage and current are sampled at the same instant, enabling accurate phase and power calculations. The device's low power consumption is beneficial for energy-efficient monitoring systems. The SPI interface allows easy integration with metering ICs and microcontrollers. The small LFCSP package saves board space in compact power monitors.
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Data Acquisition Systems
The AD7381BCPZ is a versatile choice for data acquisition systems, offering high speed, dual simultaneous sampling, and a simple SPI interface. It can be used in multi-channel systems with multiple ADCs to capture synchronized data. The 14-bit resolution provides good dynamic range for various sensor signals. The device's low power consumption is ideal for portable and battery-powered data loggers. The small package allows high-density designs. The wide operating temperature range makes it suitable for industrial data acquisition. The device's performance is guaranteed over the full temperature range, ensuring reliable data capture in harsh environments.
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Industrial Automation
In industrial automation, the AD7381BCPZ provides high-speed, accurate analog-to-digital conversion for process control and monitoring. Its dual simultaneous sampling is useful for measuring multiple parameters, such as pressure and temperature, at the same time. The 4 MSPS throughput enables fast response in closed-loop control systems. The device's robust design and wide temperature range ensure reliable operation in factory environments. The SPI interface simplifies integration with PLCs and industrial controllers. The small package is advantageous for space-limited automation modules. The device's low power consumption reduces heat generation in densely populated control cabinets.
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Test and Measurement
The AD7381BCPZ is suitable for test and measurement equipment, such as oscilloscopes and data loggers, where high-speed and high-resolution conversion is required. The 4 MSPS sampling rate allows capturing fast transients and waveforms. The dual simultaneous sampling enables accurate time-correlated measurements on multiple channels. The device's low noise and high linearity ensure accurate signal reproduction. The SPI interface allows easy integration with FPGAs and microcontrollers. The small package is beneficial for portable test instruments. The device's wide operating temperature range ensures stable performance in various testing environments.
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Automotive
The AD7381BCPZ is designed for automotive applications, such as battery management systems and motor drives, where high-speed, accurate sensing is critical. Its dual simultaneous sampling is ideal for measuring battery voltage and current simultaneously. The 4 MSPS throughput enables real-time monitoring of fast-changing signals. The device operates over a wide temperature range of -40C to +125C, suitable for automotive environments. The small LFCSP package is space-efficient for automotive electronics. The SPI interface simplifies connection to automotive microcontrollers. The device's low power consumption is beneficial for reducing load on the vehicle's electrical system.
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推薦產品摘要
工程參考資料，適用於 AD7381BCPZ — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | AD7380BCPZ | AD7384BCPZ | AD4696BCPZ |
|---|---|---|---|---|
| Resolution | 14-bit | 16-bit | 14-bit | 16-bit |
| Sampling Rate | 4 MSPS | 4 MSPS | 4 MSPS | 500 kSPS |
| Number of Channels | 2 | 2 | 4 | 8 |
| Input Type | Differential | Differential | Differential | Differential |
| Interface | SPI | SPI | SPI | SPI |
| Package | 16-LFCSP (3x3 mm) | 16-LFCSP (3x3 mm) | 16-LFCSP (3x3 mm) | 16-LFCSP (3x3 mm) |
| Supply Voltage | 3.0 V to 3.6 V | 3.0 V to 3.6 V | 3.0 V to 3.6 V | 1.8 V to 5.5 V |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
主要差異化特點
- Dual simultaneous sampling (對比AD4696BCPZ)
- Higher sampling rate (對比AD4696BCPZ)
- Pin-compatible with 16-bit AD7380 (對比AD7380BCPZ)
設計說明
The AD7381BCPZ operates from a 3.0 V to 3.6 V supply. Use a low-noise LDO to provide a clean supply voltage, and place 0.1 uF and 10 uF decoupling capacitors close to the VDD pin. The VIO pin should be connected to the same supply as the host interface logic to ensure proper voltage levels.
For optimal performance, use a solid ground plane and minimize the length of analog input traces. Keep the analog input traces away from digital signals to reduce coupling. Place the reference decoupling capacitor close to the VREF pin. The exposed pad should be soldered to the ground plane for thermal and electrical performance.
Ensure that the reference voltage is stable and within the specified range. An unstable reference can cause conversion errors. Also, avoid driving the analog inputs beyond the specified common-mode range. Use a proper anti-aliasing filter on the inputs to prevent high-frequency noise from aliasing into the passband.
合規資訊
RoHS compliant per Analog Devices product page. Not AEC-Q100 qualified.