AD7768-4BSTZ - 24-Bit 4-Ch Simultaneous ADC | Analog Devices
料号： AD7768-4BSTZ ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $43.6364 | $43.64 |
| 10 | $31.5152 | $315.15 |
| 100 | $27.8788 | $2,787.88 |
| 500 | $26.6667 | $13,333.35 |
| 1,000 | $25.4545 | $25,454.50 |
AD7768-4BSTZ 概述
An ADC (analog-to-digital converter) is a device that converts continuous analog signals into discrete digital numbers. The AD7768-4 is a sigma-delta ADC, which uses oversampling and noise shaping to achieve high resolution and excellent noise performance. It belongs to the family of precision data converters, specifically simultaneous sampling ADCs, which capture multiple channels at the exact same instant, essential for applications like power monitoring and vibration analysis.
Key features of the AD7768-4BSTZ include three power modes (fast, median, and low power) that allow the user to trade off input bandwidth, output data rate, and power dissipation. It offers a wideband low-pass filter with ±0.005 dB pass-band ripple and 105 dB stop-band attenuation at the Nyquist frequency. The device operates from a 2.5 V analog supply and a 2.5 V to 3.3 V digital interface supply, with a typical power dissipation of 27.5 mW in low power mode.
The AD7768-4 uses a sigma-delta modulator with a digital decimation filter, providing a flexible digital interface (SPI) for configuration and data readout. It includes an internal reference buffer and supports both differential and single-ended inputs. The device is specified over the industrial temperature range of -40°C to +105°C.
Typical applications include power line monitoring, vibration analysis, motor control, and multi-phase energy metering. Its simultaneous sampling capability and high accuracy make it ideal for systems requiring precise phase alignment between channels.
When designing with the AD7768-4, ensure proper decoupling of the analog and digital supplies, and use a low-jitter master clock to achieve the specified SNR. The power mode selection should be optimized based on the required bandwidth and power budget.
直接替换替代料： AD7768-4BSTZ ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： AD7768-4BSTZ （相同外形与封装尺寸） ——差异在于 Package, Number of Channels, Power Modes, Digital Supply Voltage, Input Type.
快速对比工具——选择替代料号进行并排对比：
AD7768-4BSTZ-RL
✓ 有现货
$11.85 / 个
查看数据手册 →AD7768BSTZ
📋 参考替代料（不在目录中）
ADS1274
📋 参考替代料（不在目录中）
ADS1174
📋 参考替代料（不在目录中）
AD7779
📋 参考替代料（不在目录中）
AD7768-4BSTZ 最大额定值与电气特性
| 分辨率 | 24 bit |
| Number of Channels | 4 |
| 采样率 | 256 kSPS |
| Input Type | Differential, Single-Ended |
| Data Interface | SPI |
| Architecture | Sigma-Delta |
| Input Bandwidth | 110.8 kHz |
| Power Modes | Fast, Median, Low Power |
| Analog Supply Voltage | 2.5 V |
| Digital Supply Voltage | 2.5 V to 3.3 V |
| 工作温度范围 | -40°C to +105°C |
| 封装 | 64-LQFP (10x10 mm) |
| 安装类型 | Surface Mount |
| Pass-Band Ripple | ±0.005 dB |
| Stop-Band Attenuation | 105 dB at Nyquist |
| RoHS 状态 | Compliant |
AD7768-4BSTZ 引脚配置
| 引脚 1 | AVDD1 — Analog power supply 2.5V |
| 引脚 2 | AVSS1 — Analog ground |
| 引脚 3 | AIN0+ — Positive analog input channel 0 |
| 引脚 4 | AIN0- — Negative analog input channel 0 |
| 引脚 5 | AIN1+ — Positive analog input channel 1 |
| 引脚 6 | AIN1- — Negative analog input channel 1 |
| 引脚 7 | AIN2+ — Positive analog input channel 2 |
| 引脚 8 | AIN2- — Negative analog input channel 2 |
| 引脚 9 | AIN3+ — Positive analog input channel 3 |
| 引脚 10 | AIN3- — Negative analog input channel 3 |
| 引脚 11 | REF+ — Positive reference input |
| 引脚 12 | REF- — Negative reference input |
| 引脚 13 | DVDD — Digital power supply 2.5V to 3.3V |
| 引脚 14 | DGND — Digital ground |
| 引脚 15 | SCLK — Serial clock input |
| 引脚 16 | SDI — Serial data input |
| 引脚 17 | SDO — Serial data output |
| 引脚 18 | CS — Chip select (active low) |
| 引脚 19 | DRDY — Data ready output |
| 引脚 20 | RESET — Reset input (active low) |
| 引脚 21 | SYNC_IN — Synchronization input |
| 引脚 22 | MCLK — Master clock input |
| 引脚 23 | PWDN — Power down input |
| 引脚 24 | GPIO0 — General purpose I/O |
| 引脚 25 | GPIO1 — General purpose I/O |
| 引脚 26 | GPIO2 — General purpose I/O |
| 引脚 27 | GPIO3 — General purpose I/O |
| 引脚 28 | AVDD2 — Analog power supply 2.5V |
| 引脚 29 | AVSS2 — Analog ground |
| 引脚 30 | VDRIVE — Digital interface supply |
| 引脚 31 | DVDD2 — Digital power supply |
| 引脚 32 | DGND2 — Digital ground |
典型应用
AD7768-4BSTZ 适用于 6 应用s: Power Line Monitoring, Vibration Analysis, Motor Control, Multi-Phase Energy Metering, Audio Test and Measurement, Data Acquisition Systems.
Power Line Monitoring
The AD7768-4BSTZ is ideal for power line monitoring systems that require simultaneous sampling of voltage and current across multiple phases. Its 24-bit resolution and 256 kSPS data rate enable accurate measurement of harmonics and power quality. The device's three power modes allow optimization for low power consumption in battery-powered monitors, while the wideband filter ensures minimal phase error between channels. With a 110.8 kHz input bandwidth, it captures high-frequency transients essential for fault detection. The SPI interface simplifies data transfer to a host processor, and the industrial temperature range supports outdoor deployment.
推荐
Vibration Analysis
In vibration analysis, the AD7768-4BSTZ provides simultaneous sampling of multiple accelerometer signals, ensuring accurate phase relationships for modal analysis. Its 24-bit resolution captures fine vibration details, and the 256 kSPS data rate supports high-frequency vibration monitoring. The low power modes are beneficial for portable diagnostic equipment. The device's high SNR and low distortion enable precise detection of bearing faults and imbalance. The SPI output allows easy interfacing with FPGAs or DSPs for real-time processing. The compact 64-LQFP package fits space-constrained designs.
推荐
Motor Control
The AD7768-4BSTZ is well-suited for motor control applications requiring simultaneous sampling of phase currents and voltages. Its 24-bit resolution and 256 kSPS data rate enable precise current sensing for field-oriented control. The device's low power consumption is advantageous in inverter drives. The wideband input filter reduces aliasing, and the SPI interface provides fast data transfer to a microcontroller. The industrial temperature range ensures reliable operation in harsh environments. The simultaneous sampling capability ensures accurate torque and speed control by aligning current and voltage measurements.
推荐
Multi-Phase Energy Metering
For multi-phase energy metering, the AD7768-4BSTZ offers simultaneous sampling of voltage and current from multiple phases, ensuring accurate power and energy calculations. Its 24-bit resolution provides high accuracy over a wide dynamic range, and the 256 kSPS data rate supports harmonic analysis. The device's three power modes allow metering applications to balance performance and power consumption. The SPI interface enables easy integration with metering SoCs. The device's low offset and gain drift ensure long-term stability, critical for revenue-grade metering. The compact package is suitable for smart meter designs.
推荐
Audio Test and Measurement
The AD7768-4BSTZ can be used in audio test equipment for simultaneous measurement of multiple audio channels. Its 24-bit resolution and 256 kSPS data rate capture high-frequency audio signals with low distortion. The device's low noise performance is essential for accurate THD measurements. The wideband filter ensures flat response across the audio band. The SPI interface allows easy integration with audio analyzers. The device's power modes enable portable test instruments to conserve battery life. The industrial temperature range supports use in production test environments.
推荐
Data Acquisition Systems
The AD7768-4BSTZ is a key component in high-performance data acquisition systems (DAQ) requiring simultaneous sampling of multiple analog signals. Its 24-bit resolution and 256 kSPS data rate provide high accuracy for industrial and scientific measurements. The device's three power modes allow DAQ systems to optimize for speed or power. The SPI interface simplifies connection to FPGAs or microcontrollers. The wideband filter reduces aliasing, and the industrial temperature range ensures reliability in harsh environments. The compact package enables dense channel density in multi-channel DAQ modules.
推荐
推荐产品汇总
工程参考数据： AD7768-4BSTZ ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | AD7768-4BSTZ-RL | AD7768BSTZ | ADS1274 | ADS1174 | AD7779 |
|---|---|---|---|---|---|---|
| Package | 64-LQFP (10x10 mm) | 64-LQFP (10x10 mm) - same | 64-LQFP (10x10 mm) - same | HTQFP-64 - different | HTQFP-64 - different | LQFP-64 - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Texas Instruments | Texas Instruments | Analog Devices |
| Resolution | 24 bit | 24 bit | 24 bit | 24 bit | 16 bit | 24 bit |
| Number of Channels | 4 | 4 | 8 | 4 | 4 | 8 |
| Max Sampling Rate | 256 kSPS | 256 kSPS | 256 kSPS | 144 kSPS | 52 kSPS | 128 kSPS |
| Input Bandwidth | 110.8 kHz | 110.8 kHz | 110.8 kHz | 62 kHz | 23.4 kHz | 50 kHz |
| Power Modes | 3 (fast, median, low) | 3 | 3 | 2 (high-speed, high-resolution) | 2 | 3 |
| Data Interface | SPI | SPI | SPI | SPI | SPI | SPI |
关键差异点
- Three power modes for flexibility （对比 ADS1274)
- Higher input bandwidth （对比 ADS1274)
- Same package as 8-channel version （对比 AD7768BSTZ)
设计说明
The AD7768-4BSTZ requires a clean 2.5V analog supply and a 2.5V to 3.3V digital supply. Use low-dropout regulators (LDOs) with low noise, such as the ADP151, to power AVDD and DVDD. Decouple each supply pin with a 10uF and 0.1uF capacitor placed close to the pins. The VDRIVE pin should be connected to the same supply as the host interface to ensure proper logic levels.
For optimal performance, use a solid ground plane and separate analog and digital ground planes, connecting them at a single point near the ADC. Route analog inputs away from digital traces to minimize coupling. Place the reference decoupling capacitors close to the REF+ and REF- pins. Use a low-jitter master clock source, such as a crystal oscillator, to achieve the specified SNR.
Ensure the master clock frequency is within the specified range (typically 32.768 MHz for 256 kSPS). Incorrect clock frequency will result in incorrect output data rates. Also, avoid floating unused analog inputs; tie them to AVSS or a common-mode voltage. The RESET pin must be held low for at least 10ns after power-up to initialize the device properly.
合规信息
RoHS compliant per Analog Devices product page. Not AEC-Q100 qualified.
