si4430 Silicon Laboratories, si4430 Datasheet - Page 125

• Manufacturer Part Number: si4430
• Description: Si4430 Ism Transceiver
• Manufacturer: Silicon Laboratories

Register 52h. TX Ramp Control
Reset value = 00101111
Name
Type
Bit
6:4
3:2
1:0
Bit
7
ldoramp[1:0]
Reserved
txramp[1:0]
txmod[2:0]
Reserved
R/W
Name
D7
Reserved
TX Modulation Delay.
The time delay between PA enable and the beginning of the TX modulation to allow for
PA ramp-up. It can be set from 0 µs to 28 µs in 4 µs steps. This also works during PA
ramp down.
TX LDO Ramp Time.
The RF LDO is used to help ramp the PA to prevent VCO pulling and spectral splatter.
00:
01:
10:
11:
TX Ramp Time.
The PA is ramped up slowly to prevent VCO pulling and spectral splatter. This register
sets the time the PA is ramped up.
00:
01:
10:
11:
D6
5 µs
10 µs
15 µs
20 µs
5 µs
10 µs
15 µs
20 µs
txmod[2:0]
R/W
D5
Preliminary Rev. 0.4
D4
Function
D3
ldoramp[1:0]
R/W
D2
D1
txramp[1:0]
Si4430
R/W
D0
125