CMX994 Datasheet, PDF (16/61 Pages) CML Microcircuits – Local Oscillator

Direct Conversion Receivers
CMX994/CMX994A/CMX994E
L1
8.2 nH (Note 1)
C1
8.2 pF (Note 2)
C2
22pF
C3
22pF
CV1
SMV1705-079LF
CV2
SMV1705-079LF
R1
10kΩ
R2
10kΩ
Table 11 Internal VCO Amplifier Tank Circuit for 440MHz Operation
Note 1: Tolerance of 2% or better recommended
Note 2: Tolerance of 5% or better recommended
DO
Output to
R2
Tank Cct
R1
C1
C3
C2
Figure 11 Example External Components – PLL Loop Filter
C1
C2
C3
5.4 RESETN
150nF
R1
1.5kΩ
1000nF
R2
2.4kΩ
15nF
Table 12 3rd Order Loop Filter Circuit Values
The RESETN pin generates a reset signal when low. The RESETN pin has an internal pull-up resistor of 100kΩ
connected to VDD_IO.
 2015 CML Microsystems Plc
Page 16 of 70
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