DC-6GHz digital attenuation design based on HMC792LP4E

The HMC792LP4E is a broadband 6-bit GaAs IC digital attenuator from Hittite in a low cost lead-free SMT package. The universal digital attenuator integrates an off-chip AC grounding capacitor for near-DC operation, making it suitable for a wide range of RF and IF applications.

The dual mode control interface is CMOS/TTL compatible and accepts a 3-wire serial input or a 6-bit parallel code. The HMC792LP4E also features a user-defined power-on state and an output port for serializing Hittite serial control components. The HMC792LP4E is available in a 4mm x 4mm QFN lead-free package that meets RoHS requirements, eliminating the need for external matching components.

HMC792LP4E main features

• 0.25dB LSB stepping to 15.75dB

• Power on state selection

• High input IP3: +55dBm

• Low insertion loss: 1.8dB at 2.0GHz

• Compatible with TTL/CMOS, serial, parallel or latched parallel control

• Typical step error of ±0.2dB

• Single +3V or +5V power supply

• 24 pin 4mm x 4mm SMT package


Figure 1 HMC792LP4E functional block diagram


Figure 2 HMC792LP4E application circuit

Table 1 Evaluation Board PCB 118853 Material List


HMC792LP4E typical application

• Cellular/3G infrastructure

• WiBro/WiMAX/4G

• Microwave radio and VSAT

• Test equipment and sensors

• IF and RF applications


Figure 3 HMC792LP4E evaluation board PCB layout

For applications with frequencies below 700MHz, ACG capacitors C4, C5 and C6 are recommended. For applications with frequencies greater than 700MHz, the performance of the HMC792LP4E is comparable, regardless of whether ACG capacitors are used or not.

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