AD4852BCPZ - 20-Bit 250kSPS 4-Ch DAS | Analog Devices
MPN: AD4852BCPZ ✓ Hoạt độngAD4852BCPZ Tóm tắt
A data acquisition system (DAS) is a complete signal chain that conditions, samples, and converts analog signals into digital data. The AD4852 integrates the analog front-end, ADC, and reference, simplifying design and reducing component count. It sits within the hierarchy: DAS -> ADC -> data converter -> mixed-signal IC -> semiconductor. This integration is critical for high-channel-count systems where board space and power are at a premium.
Key features include ±75pA typical input leakage at 25°C, full-scale input step settling time of less than 300ns, and an integrated 4.096V reference. The differential inputs with wide common-mode range allow direct connection to sensors and transducers without external conditioning. The device also features a flexible digital interface supporting SPI and daisy-chain modes, enabling multiple devices to be cascaded for higher channel counts.
Technically, the AD4852 uses a successive approximation register (SAR) architecture with internal buffering, eliminating the need for external driver amplifiers. The integrated reference buffer ensures stable and accurate conversions over temperature. The device includes a temperature sensor and a 1.024V output for system diagnostics. Its power dissipation scales with throughput, making it suitable for battery-powered and thermal-constrained applications.
Typical applications include industrial automation, motor control, power line monitoring, and multi-phase energy metering. The simultaneous sampling capability is essential for applications requiring phase-accurate measurements across multiple channels, such as three-phase power monitoring and vibration analysis. The wide common-mode input range and high input impedance simplify sensor interfacing.
When designing with the AD4852, ensure adequate decoupling on the AVDD and DVDD supplies, and use the integrated reference buffer to drive the reference input. The device supports a 1.8V to 5V digital interface, allowing direct connection to modern microcontrollers and FPGAs. For optimal performance, follow the layout guidelines in the datasheet, including a solid ground plane and minimal trace lengths on the analog inputs.
Bộ thay thế dễ dàng lắp đặt cho AD4852BCPZ — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
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Yêu cầu các bộ thay thếAD4852BCPZ Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 20 bits |
| Number of Channels | 4 |
| Tỷ lệ lấy mẫu | 250 kSPS per channel |
| Input Type | Differential |
| Input Leakage Current | ±75 pA typical at 25°C |
| Settling Time | < 300 ns (full-scale step) |
| Điện áp tham chiếu | 4.096 V (internal) |
| Power Dissipation | 36 mW per channel at 250 kSPS |
| Điện áp cung cấp | 5 V (low voltage) |
| Digital Interface | SPI, daisy-chain |
| Hộp | 64-lead LFCSP |
| Integrated Reference | Yes (4.096 V) |
| Integrated Supply Decoupling | Yes |
| Trạng thái RoHS | Compliant |
Cấu hình chân AD4852BCPZ
| Chân 1 | AVDD — Analog power supply |
| Chân 2 | AIN0+ — Positive analog input channel 0 |
| Chân 3 | AIN0- — Negative analog input channel 0 |
| Chân 4 | AIN1+ — Positive analog input channel 1 |
| Chân 5 | AIN1- — Negative analog input channel 1 |
| Chân 6 | AIN2+ — Positive analog input channel 2 |
| Chân 7 | AIN2- — Negative analog input channel 2 |
| Chân 8 | AIN3+ — Positive analog input channel 3 |
| Chân 9 | AIN3- — Negative analog input channel 3 |
| Chân 10 | REF — Reference input/output |
| Chân 11 | GND — Ground |
| Chân 12 | DVDD — Digital power supply |
Ứng dụng tiêu biểu
AD4852BCPZ phù hợp cho 6 Áp dụngs: Industrial Automation, Motor Control, Power Line Monitoring, Multi-Phase Energy Metering, Vibration Analysis, Test and Measurement.
Industrial Automation
The AD4852BCPZ's 20-bit resolution and 250kSPS per channel enable precise, simultaneous sampling of multiple analog signals in industrial control systems. Its differential inputs with wide common-mode range reject noise in harsh factory environments. The integrated reference and buffers reduce external component count, simplifying design. With 36mW per channel, it suits power-sensitive PLC and process control modules. The SPI interface allows easy connection to industrial microcontrollers, and the daisy-chain capability supports multi-device synchronization for larger channel counts.
Được đề xuất
Motor Control
In motor control, the AD4852BCPZ provides simultaneous sampling of phase currents and voltages, essential for accurate vector control. Its 20-bit resolution captures fine current details, improving torque ripple and efficiency. The fast settling time (<300ns) ensures accurate sampling during PWM switching transients. The integrated reference and buffers simplify the analog front-end, reducing board space. Operating from a 5V supply, it easily interfaces with motor control DSPs or FPGAs via SPI. The wide common-mode input range allows direct connection to shunt resistors and sensor bridges.
Được đề xuất
Power Line Monitoring
The AD4852BCPZ is ideal for power line monitoring, where simultaneous sampling of voltage and current across multiple phases is critical for accurate power quality analysis. Its 20-bit resolution provides high dynamic range to measure small signals in the presence of large line voltages. The differential inputs with wide common-mode range handle high-voltage sensing via external dividers or CTs. The integrated reference ensures stable measurements over temperature. With 250kSPS per channel, it can capture harmonics up to the 50th order. The SPI interface enables easy integration with metering SoCs.
Được đề xuất
Multi-Phase Energy Metering
For multi-phase energy metering, the AD4852BCPZ provides simultaneous sampling of all phases, ensuring accurate phase angle measurements. Its 20-bit resolution enables precise energy calculation even at low currents. The integrated reference and buffers reduce external component count, making it suitable for compact meter designs. The device's low power dissipation (36mW per channel) is beneficial for always-on metering applications. The SPI interface with daisy-chain support allows multiple AD4852s to be cascaded for more channels. The wide common-mode input range simplifies connection to current transformers and voltage dividers.
Được đề xuất
Vibration Analysis
The AD4852BCPZ's simultaneous sampling and 20-bit resolution make it suitable for multi-axis vibration analysis. It can capture high-frequency vibration signals with low noise, enabling early fault detection in rotating machinery. The differential inputs reject common-mode noise from long sensor cables. The fast settling time ensures accurate sampling of transient events. With 250kSPS per channel, it can capture vibration frequencies up to 125kHz (Nyquist). The integrated reference and buffers simplify the signal chain, reducing board space in portable vibration analyzers. The SPI interface allows easy connection to DSPs for real-time FFT processing.
Được đề xuất
Test and Measurement
In test and measurement equipment, the AD4852BCPZ provides high-resolution, simultaneous sampling for multi-channel data acquisition. Its 20-bit resolution and 250kSPS per channel enable accurate capture of fast transients. The integrated reference and buffers reduce external component count, making it ideal for compact instruments. The device's low power dissipation is beneficial for portable equipment. The SPI interface with daisy-chain support allows easy expansion to more channels. The wide common-mode input range and high input impedance simplify connection to various sensors and signal sources.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho AD4852BCPZ — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | AD4852BBCZ | AD7384-4BCPZ | AD7383-4BCPZ | AD7606BSTZ |
|---|---|---|---|---|---|
| Package | 64-lead LFCSP | 64-BGA (7x7) | LFCSP | LFCSP | LQFP-64 |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 20 bits | 20 bits | 16 bits | 16 bits | 16 bits |
| Number of Channels | 4 | 4 | 4 | 4 | 8 |
| Sampling Rate | 250 kSPS | 250 kSPS | 4 MSPS | 4 MSPS | 200 kSPS |
| Input Type | Differential | Differential | Differential | Differential | Differential |
| Integrated Reference | Yes (4.096V) | Yes (4.096V) | Yes (2.5V) | Yes (2.5V) | Yes (2.5V) |
| Power Dissipation | 36 mW/channel | 36 mW/channel | 38 mW/channel | 38 mW/channel | 100 mW/channel |
Bảo phân biệt quan trọng
- 20-bit resolution with simultaneous sampling (vsAD7384-4BCPZ)
- Integrated reference and buffers (vsAD7606BSTZ)
- Lower power dissipation (vsAD7606BSTZ)
Ghi chú thiết kế
The AD4852BCPZ operates from a 5V supply. Use separate analog (AVDD) and digital (DVDD) supplies to minimize digital noise coupling. Place 0.1uF and 10uF decoupling capacitors close to each supply pin. The integrated supply decoupling capacitors help, but external capacitors are still required for optimal performance. Refer to the datasheet's power supply recommendations.
For best performance, use a solid ground plane and minimize trace lengths on analog inputs. Keep analog input traces away from digital signals to reduce crosstalk. Use differential routing for the analog inputs to maintain common-mode rejection. Follow the layout guidelines in the AD4852 datasheet, including proper placement of decoupling capacitors and reference bypassing.
Ensure the reference input is properly bypassed with a 10uF capacitor. Do not exceed the absolute maximum ratings on the analog inputs. The device supports a 1.8V to 5V digital interface; ensure the host logic levels are compatible. For daisy-chain operation, configure the SPI correctly to avoid data corruption. Verify the power-up sequence as recommended in the datasheet.
Thông tin tuân thủ
RoHS compliant per Analog Devices product page. Other compliance data not specified in provided data.
