ADRF5721 - 4-Bit Digital Attenuator 9kHz-40GHz | Analog Devices
MPN: ADRF5721 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $12.5 | $12.50 |
| 10 | $11.25 | $112.50 |
| 100 | $10 | $1,000.00 |
| 500 | $9 | $4,500.00 |
| 1,000 | $8.1 | $8,100.00 |
Drop-in alternatives for ADRF5721 β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ADRF5731BCCZN
β Drop-Inπ Reference alternative (not in catalog)
ADRF5720BCCZN
β Drop-Inπ Reference alternative (not in catalog)
ADRF5740BCCZN
β Drop-Inπ Reference alternative (not in catalog)
PE43711A
β Drop-Inπ Reference alternative (not in catalog)
HMC472ALP4E
β Drop-Inπ Reference alternative (not in catalog)
ADRF5721 Maximum Ratings & Electrical Characteristics
| Type | Silicon 4-bit digital attenuator |
| Attenuation Range | 30 dB |
| Attenuation Step | 2 dB |
| Frequency Range | 9 kHz to 40 GHz |
| Insertion Loss | 3.4 dB (max) |
| Impedance | 50 Ξ© |
| RF Input Power (Average) | 26 dBm |
| RF Input Power (Peak) | 30 dBm |
| Control Interface | 4-bit parallel |
| Package | 16-terminal LGA, 2.5 mm Γ 2.5 mm |
| Operating Temperature | -40Β°C to +105Β°C |
| RoHS | Compliant |
| Lead-Free | Yes |
| Mounting Type | Surface Mount |
| Pin Compatibility | Pin compatible with ADRF5731 |
ADRF5721 Pin Configuration
| Pin 1 | ATTIN β RF input |
| Pin 2 | GND β Ground |
| Pin 3 | D0 β Control bit 0 (LSB) |
| Pin 4 | D1 β Control bit 1 |
| Pin 5 | D2 β Control bit 2 |
| Pin 6 | D3 β Control bit 3 (MSB) |
| Pin 7 | LE β Latch enable |
| Pin 8 | SEROUT β Serial output for daisy chaining |
| Pin 9 | GND β Ground |
| Pin 10 | ATTOUT β RF output |
| Pin 11 | GND β Ground |
| Pin 12 | GND β Ground |
| Pin 13 | GND β Ground |
| Pin 14 | GND β Ground |
| Pin 15 | GND β Ground |
| Pin 16 | GND β Ground |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
ADRF5721 is suitable for 6 applications: 5G Infrastructure, Radar Systems, Test and Measurement, Electronic Warfare, Satellite Communications, Microwave Backhaul.
5G Infrastructure
The ADRF5721 is ideal for 5G base stations and small cells, providing precise gain control in transmit and receive paths. Its wide frequency range up to 40 GHz covers mmWave bands, and its high power handling of 26 dBm average ensures robust performance. The low insertion loss of 3.4 dB helps maintain signal integrity, while the 4-bit interface allows fast attenuation adjustments for dynamic power control.
Recommended
Radar Systems
In radar systems, the ADRF5721 is used for gain leveling and protection. Its 30 dB attenuation range in 2 dB steps allows precise control of signal levels, while the 50 Ξ© impedance ensures compatibility with standard RF components. The device operates from 9 kHz to 40 GHz, covering various radar bands, and can handle peak power up to 30 dBm, making it suitable for high-power transmit/receive modules.
Recommended
Test and Measurement
The ADRF5721 is widely used in test equipment such as signal generators, spectrum analyzers, and network analyzers. Its wide frequency range and precise attenuation steps enable accurate signal level setting. The 4-bit parallel interface simplifies integration with microcontrollers, and the compact LGA package saves board space. The device's high linearity ensures minimal distortion in measurement paths.
Recommended
Electronic Warfare
In electronic warfare systems, the ADRF5721 provides fast and accurate attenuation for signal conditioning and jamming. Its wide frequency range from 9 kHz to 40 GHz covers multiple bands, and the high power handling of 26 dBm average ensures reliability in harsh environments. The device's small size and low insertion loss are critical for compact, high-performance EW modules.
Recommended
Satellite Communications
The ADRF5721 is used in satellite communication systems for gain control in both uplink and downlink paths. Its frequency range up to 40 GHz covers Ku, Ka, and V bands, and the 50 Ξ© impedance matches standard satellite RF components. The device's low insertion loss and high power handling make it suitable for high-throughput satellite systems, while the 4-bit control allows precise power leveling.
Recommended
Microwave Backhaul
In microwave backhaul systems, the ADRF5721 is used for automatic gain control and power leveling. Its wide frequency range from 9 kHz to 40 GHz covers common backhaul bands, and the 30 dB attenuation range provides sufficient adjustment. The device's high power handling and low insertion loss ensure reliable performance in point-to-point links, while the compact package simplifies integration into outdoor units.
Recommended
Recommended Products Summary
Engineering reference data for ADRF5721 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADRF5731BCCZN | ADRF5720BCCZN | ADRF5740BCCZN | PE43711A | HMC472ALP4E |
|---|---|---|---|---|---|---|
| Package | 16-terminal LGA | 16-terminal LGA | 16-terminal LGA | 16-terminal LGA | 16-terminal LGA | 16-terminal LGA |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | pSemi | Analog Devices |
| Frequency Range | 9 kHz to 40 GHz | 100 MHz to 40 GHz | 9 kHz to 40 GHz | 9 kHz to 40 GHz | 9 kHz to 40 GHz | DC to 3.8 GHz |
| Attenuation Range | 30 dB | 30 dB | 31.5 dB | 15.5 dB | 31 dB | 31.5 dB |
| Step Size | 2 dB | 2 dB | 0.5 dB | 0.5 dB | 0.5 dB | 0.5 dB |
| Insertion Loss | 3.4 dB | 3.4 dB | 3.4 dB | 3.4 dB | 2.5 dB | 2.5 dB |
| RF Input Power (Average) | 26 dBm | 26 dBm | 26 dBm | 26 dBm | 30 dBm | 24 dBm |
| Control Interface | 4-bit parallel | 4-bit parallel | 6-bit parallel | 5-bit parallel | SPI | 6-bit parallel |
Key Differentiators
- Wide frequency range from 9 kHz to 40 GHz (vs HMC472ALP4E)
- High power handling of 26 dBm average (vs HMC472ALP4E)
- Pin compatible with ADRF5731 (vs PE43711A)
Design Notes
Ensure proper grounding and thermal management for the LGA package. Use multiple vias under the exposed pad to connect to the ground plane, and follow the recommended PCB layout in the datasheet to minimize parasitic inductance and ensure optimal RF performance.
Keep RF traces as short as possible and use controlled impedance (50 Ξ©) lines. Place decoupling capacitors close to the control pins to filter digital noise, and avoid routing high-speed digital signals near the RF path to prevent coupling.
Do not exceed the maximum RF input power of 30 dBm peak, as this can damage the device. Also, ensure the control interface is properly latched to avoid unintended attenuation states. Refer to the datasheet for timing requirements of the LE and data pins.
Compliance Information
RoHS compliant per datasheet. Lead-free. No AEC-Q100 qualification indicated.
