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CMX991 Datasheet(PDF) 18 Page - CML Microcircuits

Part No. CMX991
Description  Two-mode demodulator
Download  56 Pages
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Maker  CMLMICRO [CML Microcircuits]
Homepage  http://www.cmlmicro.com
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CMX991 Datasheet(HTML) 18 Page - CML Microcircuits

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RF Quadrature Transceiver / RF Quadrature Receiver
CMX991/CMX992
 2015 CML Microsystems Plc
18
D/991_992/20
C3
C2
C1
R1
R2
DOIF
(pin 40)
Output to
Tank Cct
Figure 14 Example External Components
– IF LO Loop Filter
C1
22nF
R1
430
Ω
C2
470nF
R2
12k
Ω
C3
1nF
Table 12 IF LO 3
rd Order Loop Filter Circuit for 180MHz Operation
To inject an external IF LO signal, the negative resistance amplifier should be disabled, with the VCON
input decoupled to ground with a 1nF capacitor. The signal is then applied to VCOP via a dc blocking
capacitor (e.g. 1nF). Other circuitry shown above, such as the tank circuit, should be not fitted.
Note: When using an external IF VCO the N divider can experience a transient during start up that will
cause i
ncorrect operation (charge pump always ‘high’). To avoid this situation either the value of the PLL N
divider should be an integer multiple of 4 or it is necessary to ensure that the external VCO is powered-up
before the PLL is enabled (register $21, b7).


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