SI4463 datasheet(34/53 Pages) SILABS

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Si4463/61/60-C

Rev 1.0

The ramping profile is close to a linear ramping profile with smoothed out corner when approaching Vhi and Vlo.

The TXRAMP pin can source up to 1 mA without voltage drooping. The TXRAMP pin’s sinking capability is

equivalent to a 10 k

 pull-down resistor.

Vhi = 3 V when Vdd > 3.3 V. When Vdd < 3.3 V, the Vhi will be closely following the Vdd, and ramping time will be

smaller also.

Vlo = 0 V when NO current needed to be sunk into TXRAMP pin. If 10uA need to be sunk into the chip, Vlo will be

10 µA x 10k = 100 mV.

Table 15. Ramp Times as a Function of TC[3:0] Value

Ramp Time (µs)

01.25

11.33

21.43

31.54

41.67

51.82

62.00

72.22

82.50

92.86

3.33

4.00

5.00

6.67

10.00

20.00

Number

Command

Summary

0x2200

PA_MODE

Sets PA type.

0x2201

PA_PWR_LVL

Adjust TX power in fine steps.

0x2202

PA_BIAS_CLKDUTY

Adjust TX power in coarse steps

and optimizes for different

match configurations.

0x2203

PA_TC

Changes the ramp up/down time

of the PA.

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