AMIS-52100 Low-Power Transceiver with Clock and Data Recovery
Data Sheet
8.2 VCO1, VCO2, Voltage Controlled Oscillator Tune
The VCO1 and VCO2 pins connect a parallel combination of a capacitor and an inductor to the AMIS-52100 internal voltage controlled
oscillator (VCO). The external LC (parallel inductor and capacitor) circuit sets the frequency of the internal VCO. The VCO frequency
must be set to be twice the desired TX or RX frequency of the AMIS-52100. The range of the VCO frequency is 600MHz to 1536MHz.
The voltage on these pins can be used to indicate proper operation of the AMIS-52100 PLL/VCO circuits, refer to the AMIS application
note; “First Time Users Guide to working with the Transceiver IC” for more information.
Table 11: VCO Control Registers
VCO/PLL Control Registers
Register (HEX)
0x06
Name
Charge Pump
Bits
0,1
States
00
Comments
20uA
01
25uA
10
50uA*
11
100uA
VCO Current
2,3,4
000
001
010
011
100
101
110
111
0
180uA
220uA
260uA
300uA
340uA*
380uA
420uA
460uA
Divider is 64
Divider is 128
PLL Divider
7
1
*Denotes the normal value
Figure 4: Typical Components for VCO Tuning at 402MHz
AMI Semiconductor – Rev 4.0, Mar. 06 – M-20535-004
7
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