AD7946BCPZ - 14-Bit 500kSPS PulSAR ADC | Analog Devices
MPN： AD7946BCPZ ✓ 啟用中AD7946BCPZ 概覽
An ADC (analog-to-digital converter) is an electronic component that converts continuous analog signals into discrete digital values, enabling digital processing of real-world signals. The AD7946 is a successive approximation register (SAR) ADC, which uses a charge redistribution architecture to achieve high accuracy and speed with low power consumption. SAR ADCs are widely used in applications requiring a balance of resolution, speed, and power efficiency, such as industrial process control, medical instrumentation, and portable devices.
Key features of the AD7946 include 14-bit resolution with no missing codes, integral nonlinearity (INL) of 0.4 LSB typical and 1 LSB maximum, and differential nonlinearity (DNL) of 0.25 LSB typical and 0.7 LSB maximum. The device operates over an industrial temperature range of -40°C to +85°C and features a pseudo-differential analog input with an input voltage range of -0.5 V to 5.8 V. The AD7946 also includes a 1-pole low-pass filter on the analog input, which helps to reduce noise from the driving amplifier.
The AD7946 uses a charge redistribution architecture with an internal sample-and-hold circuit, providing excellent AC and DC performance. The device supports multiple power-down modes, including Warp, Normal, and Impulse, allowing designers to optimize power consumption versus throughput. The SPI-compatible serial interface enables easy connection to microcontrollers and DSPs, and the device is fully specified for operation from a single 5 V supply.
Typical applications for the AD7946 include high-speed data acquisition, industrial process control, medical instrumentation, and portable battery-powered devices. Its low power consumption and small package make it ideal for portable and space-constrained applications, while its high accuracy and speed suit demanding industrial and medical systems.
When designing with the AD7946, ensure that the analog input is driven by a low-impedance source and that adequate decoupling is provided on the VDD pin. The device's noise performance is excellent, allowing the use of a noisier amplifier to meet system noise specifications, as the internal filter attenuates high-frequency noise.
直接替換替代品，適用於 AD7946BCPZ — 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： AD7946BCPZ （相同外形與佔位） — 差異在於 Architecture, Package, Input Type, Resolution, Operating Temperature.
AD7946BCP
✅ 直接替換📋 參考替代品（不在目錄中）
AD7946BCPZ 最大額定值與電氣特性
| 解析度 | 14-bit |
| Sample Rate (Warp mode) | 500 kSPS |
| Sample Rate (Normal mode) | 450 kSPS |
| Sample Rate (Impulse mode) | 380 kSPS |
| INL | 0.4 LSB typ, 1 LSB max |
| DNL | 0.25 LSB typ, 0.7 LSB max |
| 輸入電壓範圍 | -0.5 V to 5.8 V |
| 供應電壓 | 5 V |
| 工作溫度 | -40°C to +85°C |
| 封裝 | 10-lead LFCSP (3 mm x 3 mm) |
| 安裝類型 | Surface Mount |
| 腳位數 | 10 |
| Architecture | SAR (charge redistribution) |
| Input Type | Pseudo-differential |
| 介面 | SPI-compatible |
AD7946BCPZ 腳位配置
| 腳位 1 | VDD — Power supply, 5V |
| 腳位 2 | GND — Ground |
| 腳位 3 | IN+ — Positive analog input |
| 腳位 4 | IN- — Negative analog input |
| 腳位 5 | REF — Reference input |
| 腳位 6 | SCK — Serial clock input |
| 腳位 7 | SDI — Serial data input |
| 腳位 8 | SDO — Serial data output |
| 腳位 9 | CNV — Convert input |
| 腳位 10 | GND — Ground |
典型應用
AD7946BCPZ 適用於 6 應用s: High-Speed Data Acquisition, Industrial Process Control, Medical Instrumentation, Portable Battery-Powered Devices, Test and Measurement Equipment, Communication Systems.
High-Speed Data Acquisition
The AD7946BCPZ's 500 kSPS sample rate and 14-bit resolution make it ideal for high-speed data acquisition systems. Its low power consumption and small package enable compact designs. The SPI interface simplifies connection to microcontrollers, and the pseudo-differential input reduces common-mode noise, ensuring accurate signal capture in industrial and test equipment.
推薦
Industrial Process Control
In industrial process control, the AD7946BCPZ provides accurate, high-speed conversion of sensor signals. Its 14-bit resolution and low INL ensure precise monitoring of temperature, pressure, and flow. The device operates over -40°C to +85°C, suitable for harsh environments. The SPI interface allows easy integration with PLCs and industrial microcontrollers, and the small LFCSP package saves board space.
推薦
Medical Instrumentation
The AD7946BCPZ is well-suited for medical instrumentation such as patient monitoring and diagnostic equipment. Its low power consumption extends battery life in portable devices, while the 14-bit resolution provides accurate readings. The small package enables miniaturization of medical devices. The device's low noise performance allows the use of simpler front-end amplifiers, reducing system cost and complexity.
推薦
Portable Battery-Powered Devices
For portable devices, the AD7946BCPZ offers multiple power-down modes (Warp, Normal, Impulse) to optimize power consumption. Its low power dissipation extends battery life, and the 3x3 mm LFCSP package is ideal for compact designs. The SPI interface is compatible with low-power microcontrollers, and the device operates from a single 5 V supply, simplifying power management.
推薦
Test and Measurement Equipment
The AD7946BCPZ is used in test and measurement equipment such as digital multimeters and data loggers. Its high sample rate and 14-bit resolution enable accurate waveform capture. The device's low INL and DNL ensure linearity, and the SPI interface allows fast data transfer to processors. The small package and industrial temperature range make it suitable for benchtop and portable instruments.
推薦
Communication Systems
In communication systems, the AD7946BCPZ can be used for baseband signal digitization in software-defined radios and receivers. Its 500 kSPS sample rate is sufficient for narrowband signals, and the 14-bit resolution provides good dynamic range. The device's low power consumption is beneficial for portable communication devices. The SPI interface enables easy integration with DSPs and FPGAs.
推薦
推薦產品摘要
工程參考資料，適用於 AD7946BCPZ — 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 | AD7946BRMZ | AD7946BCP | ADS7946 |
|---|---|---|---|---|
| Package | 10-lead LFCSP (3x3 mm) | 10-lead MSOP | 10-lead LFCSP (3x3 mm) | 10-lead MSOP |
| Brand | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Resolution | 14-bit | 14-bit | 14-bit | 14-bit |
| Sample Rate | 500 kSPS | 500 kSPS | 500 kSPS | 2 MSPS |
| Input Voltage Range | -0.5 V to 5.8 V | -0.5 V to 5.8 V | -0.5 V to 5.8 V | 0 V to 5 V |
| Supply Voltage | 5 V | 5 V | 5 V | 2.7 V to 5.5 V |
| INL | 0.4 LSB typ | 0.4 LSB typ | 0.4 LSB typ | 1 LSB max |
| Interface | SPI | SPI | SPI | SPI |
主要差異化特點
- Higher sample rate than AD7942 (對比AD7942BRMZ)
- Smaller package than AD7946BRMZ (對比AD7946BRMZ)
- Lower power consumption than ADS7946 (對比ADS7946)
設計說明
Decouple the VDD pin with a 10 µF and 0.1 µF capacitor placed as close as possible to the pin. The AD7946 operates from a single 5 V supply; ensure the supply is clean and stable to maintain ADC accuracy. Refer to the datasheet's power supply recommendations.
For optimal performance, use a solid ground plane and minimize trace lengths on the analog input. The pseudo-differential input should be routed with care to avoid noise pickup. Place the ADC close to the signal source to reduce parasitic capacitance.
Avoid driving the analog input beyond the specified -0.5 V to 5.8 V range, as this can damage the device. Use an external buffer amplifier if the source impedance is high. Also, ensure the reference input is properly decoupled to avoid reference noise affecting conversion accuracy.
合規資訊
RoHS compliant per ADI product page. Not AEC-Q100 qualified.
