AD4851BCPZ - 16-Bit 4-Ch Simultaneous Sampling DAS | Analog Devices
MPN: AD4851BCPZ ✓ Hoạt độngAD4851BCPZ Tóm tắt
A data acquisition system (DAS) is a complete signal chain that conditions, samples, and converts analog signals to digital words. The AD4851 integrates the input buffer, ADC, and reference, reducing external component count and simplifying design. It sits within the hierarchy: DAS -> ADC -> data converter -> mixed-signal IC -> semiconductor. This integration is critical for multi-channel systems where board space and channel-to-channel matching are paramount.
Key features include simultaneous sampling of four channels, ensuring phase-accurate capture of multi-phase signals, and a wide common-mode input range that accommodates various sensor outputs without external level shifting. The integrated reference and buffer eliminate the need for external reference circuitry, while internal supply decoupling capacitors reduce external bypass requirements. The device operates over the industrial temperature range and is recommended for new designs.
Architecturally, the AD4851 uses a successive approximation register (SAR) architecture, offering a balance of speed, resolution, and power. The internal buffers present a high-impedance input to the sensor, minimizing loading and preserving signal integrity. The wide common-mode range allows direct connection to differential signals with large offsets, simplifying front-end design. The 250kSPS per channel throughput supports high-speed industrial and instrumentation applications.
Typical applications include motor control (phase current and voltage sensing), power monitoring, vibration analysis, and multi-phase power quality measurement. The simultaneous sampling capability is essential for accurate power calculations in three-phase systems. The device's low power and small footprint make it suitable for portable and space-constrained designs.
When designing with the AD4851, ensure adequate decoupling on the supply pins and a clean reference voltage. The internal reference is 4.096V, but an external reference can be used if higher accuracy is required. The SPI interface simplifies connection to microcontrollers and DSPs. Careful PCB layout, with short analog input traces and a solid ground plane, is essential to achieve the specified performance.
Bộ thay thế dễ dàng lắp đặt cho AD4851BCPZ — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với AD4851BCPZ (cùng hình factor và footprint) — khác nhau ở Architecture, Input Type, Number of Channels, Package, Resolution.
AD4851BBCZ
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD7384-4BCPZ
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →AD4851BCPZ Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 16 bits |
| Number of Channels | 4 |
| Tỷ lệ lấy mẫu | 250 kSPS per channel |
| Input Type | Differential |
| Input Leakage | ±75 pA typical at 25°C |
| Settling Time | < 300 ns (full-scale input step) |
| Điện áp tham chiếu | 4.096 V (internal) |
| Điện áp cung cấp | 5 V (single) |
| Power Dissipation | 36 mW per channel at 250 kSPS |
| Hộp | 64-BGA (7x7 mm) |
| Giao diện | SPI |
| Architecture | SAR |
| Integrated Buffers | 4 (internal) |
| Supply Decoupling Capacitors | Integrated |
Cấu hình chân AD4851BCPZ
| Chân 1 | AVDD — Analog supply voltage (5V) |
| Chân 2 | AVSS — Analog ground |
| Chân 3 | VIN1+ — Positive analog input channel 1 |
| Chân 4 | VIN1- — Negative analog input channel 1 |
| Chân 5 | VIN2+ — Positive analog input channel 2 |
| Chân 6 | VIN2- — Negative analog input channel 2 |
| Chân 7 | VIN3+ — Positive analog input channel 3 |
| Chân 8 | VIN3- — Negative analog input channel 3 |
| Chân 9 | VIN4+ — Positive analog input channel 4 |
| Chân 10 | VIN4- — Negative analog input channel 4 |
| Chân 11 | REF — Reference voltage input/output |
| Chân 12 | GND — Ground |
| Chân 13 | SCLK — Serial clock input |
| Chân 14 | SDI — Serial data input |
| Chân 15 | SDO — Serial data output |
| Chân 16 | CS — Chip select (active low) |
Ứng dụng tiêu biểu
AD4851BCPZ phù hợp cho 6 Áp dụngs: Motor Control, Power Monitoring, Vibration Analysis, Multi-Phase Power Quality Measurement, Data Acquisition Systems, Instrumentation.
Motor Control
The AD4851BCPZ is ideal for motor control applications where simultaneous sampling of phase currents and voltages is critical. Its 4-channel simultaneous sampling capability ensures accurate measurement of three-phase currents and voltages, enabling precise torque and speed control. The 250kSPS per channel throughput supports high-bandwidth control loops, while the wide common-mode input range accommodates the high-side and low-side sensing without external level shifting. The integrated reference and buffers simplify the signal chain, reducing component count and board space. The low power dissipation of 36mW per channel is beneficial in thermally constrained environments. The SPI interface allows easy connection to microcontrollers and DSPs for real-time processing.
Được đề xuất
Power Monitoring
In power monitoring systems, the AD4851BCPZ provides simultaneous sampling of voltage and current channels, enabling accurate power and energy calculations. The 16-bit resolution and 250kSPS throughput allow precise measurement of harmonics and transients. The wide common-mode input range supports direct connection to current transformers and voltage dividers. The integrated reference ensures stable measurements over temperature. The device's low power consumption is suitable for energy metering applications. The SPI interface simplifies data transfer to a host processor for analysis. The compact 64-lead LFCSP package is ideal for space-constrained power monitoring modules.
Được đề xuất
Vibration Analysis
The AD4851BCPZ is well-suited for vibration analysis in industrial machinery. Its 4-channel simultaneous sampling allows synchronized acquisition of multiple accelerometer signals, preserving phase relationships essential for modal analysis. The 16-bit resolution provides high dynamic range to capture both small and large vibrations. The wide common-mode input range accommodates various sensor outputs. The low input leakage of ±75pA minimizes sensor loading. The 250kSPS throughput supports high-frequency vibration monitoring. The integrated reference and buffers reduce external components, simplifying the design. The SPI interface enables easy integration with FPGAs or DSPs for real-time processing.
Được đề xuất
Multi-Phase Power Quality Measurement
For power quality measurement in three-phase systems, the AD4851BCPZ provides simultaneous sampling of all three phases plus neutral, enabling accurate calculation of power factor, harmonics, and unbalance. The 16-bit resolution and 250kSPS throughput capture detailed waveform data. The wide common-mode input range allows direct connection to potential transformers and current transformers. The integrated reference ensures accurate measurements over temperature. The device's low power consumption is beneficial in portable power quality analyzers. The SPI interface allows high-speed data transfer to a host processor for analysis. The compact package is ideal for handheld instruments.
Được đề xuất
Data Acquisition Systems
The AD4851BCPZ is a complete data acquisition system (DAS) that integrates input buffers, ADC, and reference, making it ideal for general-purpose DAQ applications. Its 4-channel simultaneous sampling capability is useful for multi-sensor systems where phase alignment is important. The 16-bit resolution and 250kSPS throughput provide high accuracy and speed. The wide common-mode input range simplifies signal conditioning. The integrated supply decoupling capacitors reduce external components. The device operates from a single 5V supply, simplifying power design. The SPI interface is compatible with most microcontrollers. The compact package is suitable for modular DAQ designs.
Được đề xuất
Instrumentation
In precision instrumentation, the AD4851BCPZ offers high accuracy and low noise for measuring physical phenomena. Its 16-bit resolution and 250kSPS throughput enable precise measurements in applications like spectroscopy and chromatography. The wide common-mode input range allows direct connection to various sensors. The low input leakage minimizes measurement errors. The integrated reference and buffers ensure stable performance. The device's low power consumption is advantageous in battery-powered instruments. The SPI interface allows easy integration with digital signal processors. The compact package is ideal for portable instruments.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho AD4851BCPZ — 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 | AD4851BBCZ | AD7384-4BCPZ | AD7606BSTZ |
|---|---|---|---|---|
| Package | 64-LFCSP | 64-BGA (7x7 mm) | 64-LFCSP | 64-LQFP |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 16 bits | 16 bits | 16 bits | 16 bits |
| Number of Channels | 4 | 4 | 4 | 8 |
| Sampling Rate | 250 kSPS per channel | 250 kSPS per channel | 4 MSPS per channel | 200 kSPS per channel |
| Input Type | Differential | Differential | Differential | Differential |
| Reference Voltage | 4.096 V (internal) | 4.096 V (internal) | 2.5 V (internal) | 2.5 V (internal) |
| Power Dissipation | 36 mW per channel | 36 mW per channel | 50 mW per channel | 100 mW per channel |
Bảo phân biệt quan trọng
- Integrated input buffers and reference (vsAD7384-4BCPZ)
- Lower power dissipation (vsAD7606BSTZ)
- Simultaneous sampling of 4 channels (vsAD7606BSTZ-4)
Ghi chú thiết kế
The AD4851BCPZ operates from a single 5V supply. Ensure that the AVDD pin is decoupled with a 10uF ceramic capacitor and a 0.1uF capacitor placed as close to the pin as possible. The internal supply decoupling capacitors reduce external requirements, but additional decoupling is recommended for optimal performance. The power dissipation is 36mW per channel at 250kSPS, so thermal management is generally not critical, but ensure adequate copper pour for heat dissipation.
For optimal performance, use a solid ground plane and keep analog input traces short and shielded. The differential inputs should be routed as a pair to minimize noise pickup. Place the reference decoupling capacitor close to the REF pin. The SPI interface lines should be kept away from analog inputs to avoid digital noise coupling. Follow the layout guidelines in the AD4851 datasheet for best results.
A common pitfall is exceeding the absolute maximum ratings on the analog inputs. The wide common-mode input range is specified, but do not exceed the supply rails. Also, ensure that the reference voltage is stable; if using an external reference, use a low-noise source. The SPI interface timing must meet the datasheet specifications to avoid data corruption. Finally, do not forget to connect all ground pins to the ground plane.
Thông tin tuân thủ
RoHS compliant per Analog Devices product page. Not AEC-Q100 qualified. Lead-free package.
