RFM22 Datasheet, PDF (118/150 Pages) –

RFM22
Register 52h. TX Ramp Control
Bit
D7
D6
D5
D4
Name
Reserved
txmod[2:0]
Type
R/w
R/w
D3
D2
ldoramp[1:0]
R/w
D1
D0
txramp[1:0]
R/w
Reset value = 00100000
Bit
Name
Function
7
Reserved Reserved.
TX Modulation Delay.
The time delay between PA enable and the beginning of the TX modulation to
6:4
txmod[2:0]
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.
3:2
ldoramp[1:0] 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.
1:0
txramp[1:0] 00: 5 μs
01: 10 μs
10: 15 μs
11: 20 μs
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