參數(shù)資料
型號(hào): MC13111BFB
廠商: MOTOROLA INC
元件分類: 無繩電話/電話
英文描述: UNIVERSAL NARROWBAND FM RECEIVER INTEGRATED CIRCUIT
中文描述: TELECOM, CORDLESS, RF AND BASEBAND CIRCUIT, PQFP52
封裝: PLASTIC, QFP-52
文件頁數(shù): 22/68頁
文件大?。?/td> 1316K
代理商: MC13111BFB
MC13110A/B MC13111A/B
22
MOTOROLA ANALOG IC DEVICE DATA
Second Mixer
Figures 26 through 29 represents the second mixer
transfer characteristics for the voltage conversion gain,
output level, and intermodulation. There is a slight
improvement in gain when the “IP3 bit” is set to <1> for the
second mixer. (Note: This is the same programmable bit
discussed earlier in the section.)
Figure 23. Second Mixer Input and Output
Impedance Schematic
2nd Mixer
Mix2 In
Mix2 Out
RPI
CPI
RPO
CPO
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á
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á
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Impedances
á
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á
Input Impedance
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Output
Impedance
The 2nd mixer input impedance is typically 2.8 k
. It
requires an external 360
parallel resistor for use with a
standard 330
, 10.7 MHz ceramic filter. The second mixer
output impedance is 1.5 k
making it suitable to match
standard 455 kHz ceramic filters.
The IF bandwidth response of the second mixer is shown
in Figure 31. The –3.0 dB corner is 2.5 MHz. The feedthrough
parameters are summarized in Figure 25.
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á
á
Figure 25. Second Mixer Feedthrough Parameters
Parameter
(dBm)
ááááá
2nd LO Feedthrough @ Mix2 Out
IF Feedthrough @ Mix2 Out with –30 dBm
ááá
–42.9
–61.7
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