F4482 Datasheet

© 2020 Renesas Electronics Corporation

45

December 15, 2020

Evaluation Kit Operation

Power Supplies

minimize noise and fast transients. Supply noise can degrade noise figure and fast transients can trigger ESD clamps and cause them to fail.

Supply voltage change or transients should have a slew rate smaller than 1V/20µs. In addition, all control pins should remain at 0V (±0.3V) or

floating while the supply voltage ramps or while it returns to zero.

Power Supply Setup

1. Connect pin 2 to pin 4, and pin 1 to pin 3 of J26-29. This ensures operation of the Distortion and Bias resistors.

2. Set up a power supply in the voltage range of 3.15V to 3.45V with the power supply output disabled. The voltage can be applied directly

to the J14 SMA.

Power-On Procedure

Power-Off Procedure

1. Disable the RF input signal on all channels.

Application Information

The F4482 is optimized for use in high-performance RF applications ranging from 1.3GHz to 2.8GHz.

Startup Condition

Upon device power-up, all channels will default to the standby mode ON. For logic levels, see Table 11.

Default Channel Power On

The default attenuation state will be 31.5dB attenuation upon powering ON each channel (i.e., standby mode OFF). For default levels, see

Figure 77.

Chip Select (CSb)

When CSb is set to logic high, the CLK input is disabled. When CSb is set to logic low, the CLK input is enabled and the DATA word can be

programmed into the shift registers. The programmed word is then latched into the F4482 on the CSb rising edge (see Figure 79).

Standby Mode (STBY)

The F4482 has a power-down feature for power savings. The SPI bus is used to operate each channel in Standby On/Off mode (see Table 11).