ADRF5720 - 6-bit Attenuator 9kHz-40GHz | Analog Devices
MPN: ADRF5720 ✓ Hoạt độngADRF5720 Tóm tắt
A digital attenuator is a type of RF control component that reduces the amplitude of an RF signal by a controlled amount, set digitally via a parallel or serial interface. It belongs to the broader family of RF signal-conditioning components that includes switches, phase shifters, and variable gain amplifiers. Digital attenuators are essential in applications such as automatic gain control (AGC), signal leveling, calibration, and gain compensation in communication, radar, and test-and-measurement systems.
Key features of the ADRF5720 include its ultra-wideband frequency coverage from 9 kHz to 40 GHz, which is rare among digital attenuators, and its high attenuation accuracy. The device is pin-compatible with the ADRF5730, the fast switching version that operates from 100 MHz to 40 GHz. This allows designers to upgrade or downgrade between the two parts without PCB changes. The ADRF5720 also features a serial interface for setting attenuation, and it operates from a single 3.3 V or 5 V supply.
The ADRF5720 is fabricated using a silicon process, which provides high linearity and low power consumption. The device includes an on-chip driver and a serial-to-parallel interface, simplifying integration into digital control systems. The LGA package is designed for high-frequency performance, with low parasitic inductance and capacitance. The exposed pad provides a low thermal resistance path, enabling efficient heat dissipation at up to 500 mW RF power handling.
Typical applications for the ADRF5720 include AGC loops, signal leveling in test equipment, radar calibration, gain compensation in communication systems, and power control in satellite ground terminals. Its wide frequency range makes it suitable for both low-frequency baseband and high-frequency microwave applications up to 40 GHz, including 5G mmWave bands. The device is also commonly used in RF front-end protection and broadband transceiver power leveling.
When designing with the ADRF5720, it is important to provide adequate grounding and decoupling. The RF input and output ports should be matched to 50 Ω, and the control lines should be properly terminated to avoid spurious responses. The device's serial interface should be programmed according to the datasheet timing requirements to ensure accurate attenuation settings.
Bộ thay thế dễ dàng lắp đặt cho ADRF5720 — 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 ADRF5720 (cùng hình factor và footprint) — khác nhau ở Control Interface, Insertion Loss, Package, Pin Compatibility, Attenuation Range.
ADRF5730
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADRF5721
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →ADRF5731
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
ADRF5720 Thông số kỹ thuật (bản công bố của nhà sản xuất)
| Product Type | Silicon 6-Bit Digital Attenuator |
| Attenuation Range | 31.5 dB |
| Step Size | 0.5 dB |
| Frequency Range | 9 kHz to 40 GHz |
| Insertion Loss | Better than 4.5 dB |
| Characteristic Impedance | 50 Ω |
| Power Handling | 500 mW |
| Hộp | 24-Terminal 4 mm × 4 mm LGA (VFLGA Exposed Pad) |
| Nhiệt độ hoạt động | -40°C to +105°C |
| RoHS | Compliant |
| Điện áp cung cấp | 3.3 V or 5 V |
| Control Interface | Serial Interface |
| Pin Compatibility | Pin-compatible with ADRF5730 |
| Kiểu lắp đặt | Surface Mount |
Giao diện và cáp kết nối ADRF5720
ADRF5720 mở ra các giao diện và cáp kết nối sau được công bố bởi nhà sản xuất: Công suất đầu vào. Các chân mở rộng, số thứ tự cáp kết nối và giới hạn điện học được xác định trong tài liệu hướng dẫn của nhà sản xuất.
| Công suất đầu vào | 3.3 V or 5 V |
Tham khảo: hướng dẫn của nhà sản xuất cho bản đồ chân cổng mở rộng và số thứ tự chân kết nối đầy đủ.
Đặc tính điện và nhiệt
| Nhiệt độ hoạt động | -40°C to +105°C |
| Công suất đầu vào | 3.3 V or 5 V |
Các thông số điện và nhiệt của ADRF5720 được công bố bởi nhà sản xuất.
Ứng dụng tiêu biểu
ADRF5720 phù hợp cho 6 Áp dụngs: Automatic Gain Control (AGC), Test and Measurement Instrumentation, Radar Calibration, Satellite Communications, Wideband RF Front-End Protection and Power Leveling, 5G and 6G Communication Transceivers.
Automatic Gain Control (AGC)
The ADRF5720's 31.5 dB range with 0.5 dB steps provides precise closed-loop gain control across 9 kHz to 40 GHz. AGC loops can update attenuation rapidly via the serial interface to maintain a constant output level as input signals vary by more than 30 dB. The wideband coverage handles both baseband and microwave carriers, while the 50 Ω matched ports simplify cascading with amplifiers and mixers. In receiver front ends, the inherent low insertion loss (<4.5 dB) preserves noise figure. The main trade-off is that attenuation accuracy degrades near the millimeter-wave band, so calibration at operating frequency is recommended.
Được đề xuất
Test and Measurement Instrumentation
In signal generators, spectrum analyzers, and bench test sets, the ADRF5720 provides accurate leveling across a remarkably wide frequency range. The 0.5 dB step size enables repeatable calibration steps, and the 500 mW power handling supports moderate RF input levels without external pads. The RF ports are matched to 50 Ω, which is the standard impedance for coaxial test systems, allowing direct insertion into the signal chain. Its compact 4 mm × 4 mm LGA package fits dense instrument designs, and the serial interface allows automated calibration routines.
Được đề xuất
Radar Calibration
Radar systems require precise signal leveling to maintain stable receiver sensitivity. The ADRF5720 operates from 9 kHz to 40 GHz, covering L, S, C, X, Ku, and Ka bands used in defense and weather radar. Its 0.5 dB step and fast serial programming make it suitable for calibration between pulses. The exposed pad LGA enables efficient heat transfer under high duty-cycle operation. In phased-array radar, multiple ADRF5720s can be arrayed for per-element gain adjustment, and their pin compatibility with ADRF5730 allows designers to trade switching speed for low-frequency coverage.
Được đề xuất
Satellite Communications
Satellite ground terminals need automatic power control to counter rain fade and spacecraft EIRP variations. The ADRF5720's 6-bit, 0.5 dB step control provides up to 31.5 dB of gain adjustment across C, Ku, and Ka uplink/downlink bands. The serial interface simplifies FPGA integration, and the RoHS-compliant, 4 mm × 4 mm LGA package withstands the -40°C to +105°C temperature range often found in outdoor ODU electronics. With better than 4.5 dB insertion loss, it has minimal impact on the noise budget in the receive path.
Được đề xuất
Wideband RF Front-End Protection and Power Leveling
Before high-dynamic-range ADCs or sensitive LNAs, the ADRF5720 can be used to protect the input from overdriven signals while maintaining a constant level to the converter. Its 9 kHz to 40 GHz range covers many IF and RF architectures. The 50 Ω matched ports reduce reflections, and the series-attenuator topology with shunt resistive network allows absorption of excess power. The device's inline configuration does not require an external driver, and the serial control word can be updated on-the-fly to adjust system gain.
Được đề xuất
5G and 6G Communication Transceivers
In 5G and emerging 6G transceivers, wideband attenuators are used for TX power control and RX gain flattening. The ADRF5720 operates up to 40 GHz, covering mmWave bands such as n257, n258, and n260. The serial interface and standard 3.3 V or 5 V supply simplify integration with baseband processors and RF front-end modules. Its 0.5 dB step size enables precise beamform calibration and temperature compensation, while the small LGA package saves board area in compact phased-array modules.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ADRF5720 — 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 | ADRF5730 | ADRF5721 | ADRF5731 |
|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 24-Terminal LGA 4x4 mm | 24-Terminal LGA 4x4 mm (same) | 24-Terminal LGA 4x4 mm (same) | 24-Terminal LGA 4x4 mm (same) |
| Step Size | 0.5 dB | 0.5 dB | 0.5 dB | 0.5 dB |
| Switching Speed | Standard | Fast | Standard | Fast |
Bảo phân biệt quan trọng
- Lowest starting frequency in the pin-compatible family (vsADRF5730)
- Standard switching speed balanced with wideband coverage (vsADRF5731)
- Mature, fully documented ecosystem (vsADRF5721)
Ghi chú thiết kế
For operation up to 40 GHz, match all RF transmission lines to 50 Ω using coplanar waveguide or grounded microstrip on a high-frequency laminate. Place ground vias adjacent to the RF pins to minimize parasitic inductance. Keep the RF traces as short and straight as possible, avoiding right-angle bends that cause reflections at millimeter-wave frequencies.
The exposed pad of the ADRF5720 LGA package serves as both ground and heat path. For continuous 500 mW RF power dissipation, solder the pad to a solid ground plane with thermal vias to lower thermal resistance. The device is rated from -40°C to +105°C; ensure the junction temperature stays within limit under worst-case enclosure temperatures.
Decouple the 3.3 V or 5 V supply with a 100 nF capacitor close to the digital supply pin and a larger 1 uF bulk capacitor. Terminate the serial control lines properly and follow the timing requirements in the datasheet. Do not apply RF power beyond the 500 mW rating, as this can damage the internal resistive network. For frequencies near 40 GHz, account for connector and trace loss when calibrating attenuation accuracy.
Thông tin tuân thủ
RoHS compliant per Analog Devices product page and datasheet. AEC-Q100 not applicable for this RF attenuator. REACH, halogen-free, and conflict-minerals status not explicitly stated in verified web data; RoHS compliance implies lead-free.
