Micrel
MICRF405
April 2006
39
M9999-041906
(408) 955-1690
MOD_F
Comments
0..3
Programmable smoothing filter after attenuator. This can be programmed in four steps, and will produce
reasonable results for the highest bit rates.
Table 42. Modulator Filter Setting.
FSKn
Comments
0..5
The bit rate clock is set by dividing the crystal oscillator frequency by FSKClk_K*2^(3+FSKn).
Table 43. Bit Rate Setting.
FSKClk_K
Comments
1..63
The crystal oscillator is divided by this number to produce modulator clock and it is divided further down by
2^(3+FSKn) to produce the bit rate clock.
Table 44. Modulator and Bit Rate Clock Setting.
ASKn
Comments
0..3
The ASK bitrate clock is set by dividing the crystal oscillator frequency by ASKClk_K*2^(5+ASKn)
Table 45. Bit Rate Setting.
ASKClk_K Comments
1..63
The crystal oscillator is divided by this number and is divided further down by 2^(5+ASKn) to produce the
ASK bitrate clock.
Table 46. Modulator and Bit Rate Clock Setting.
ASK_PN_en
Comments
0
01010101&pattern is used in the FSK spreader during ASK.
1
111101011001000 repeated pattern is used in the FSK spreader during ASK.
Table 47. ASK Spreading.
VCO_IB2
VCO_IB1
VCO_IB0 Comments
1
1
1
Bias setting for VCO_Freq=0/1, 860 MHz
1
0
1
Bias setting for VCO_Freq=2/3, 868 MHz
0
1
1
Bias setting for VCO_Freq=4/5, 915 MHz
0
0
0
Bias setting for VCO_Freq=6/7, 950 MHz (**)
(**): When VCO_IB=000b, the bias current is set automatically by the two VCO_freq bit.
Table 48. VCO Bias Bit.
VCO_by State
Comment
0
VCO is active
1
VCO is bypassed
When VCO is bypassed, a differential signal can be applied to the circuit using
pin CPOUT and VARIN
Table 49. VCO Bypass Bit.
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