RF42/43
Register 52h. TX Ramp Control
Bit
D7
Reserved
R/w
D6
D5
txmod[2:0]
R/w
D4
D3
D2
D1
txramp[1:0]
R/w
D0
ldoramp[1:0]
Name
Type
R/w
Reset value = 00101111
Bit
Name
Function
7
Reserved
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.
6:4
3:2
txmod[2:0]
ldoramp[1:0]
TX LDO Ramp Time.
The RF LDO is used to help ramp the PA to prevent VCO pulling and spectral
splatter.
00:
5 μs
01: 10 μs
10: 15 μs
11: 20 μs
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.
txramp[1:0]
1:0
00:
5 μs
01: 10 μs
10: 15 μs
11: 20 μs
85
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