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參數(shù)資料
| 型號： | MC72000 |
| 廠商： | 飛思卡爾半導(dǎo)體(中國)有限公司 |
| 英文描述： | Integrated Bluetooth Radio |
| 中文描述： | 集成藍(lán)牙無線 |
| 文件頁數(shù)： | 33/156頁 |
| 文件大?。?/td> | 1782K |
| 代理商： | MC72000 |
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MOTOROLA
MC72000
Advance Information Data Sheet
Go to: www.freescale.com
33
The LNA can be matched to 50
by a simple capacitor/inductor network as shown in Figure 6.
Figure 6. Simple Capacitor/Inductor Network
When the LNA is disabled or the device is in the Idle or Transmit mode, the impedance of the LNA
becomes the value shown in Table 16.
The use of an antenna switch to interface the LNA with an antenna is the preferred circuit configuration as
shown in Figure 92.
In this implementation, a true RF Single-Pole, Double-Throw (SPDT) switch is used to isolate the PA
output from the LNA input during receive and transmit modes. A 1/4 wavelength trace is not required. As
a result, this implementation has the highest performance (due to the lowest loss) and smallest size at the
penalty of increased system cost. An external switch must be used for Class 1 Bluetooth devices as the
LNA input will become overloaded if not sufficiently isolated from the external PA output. The LNA
provides a nominal 6.7 dB of power gain when properly matched. The LNA is enabled approximately
150 μs after the assertion of the RTXEN pin when programmed for Receive mode. It is disabled
immediately after the deassertion of the RTXEN pin or during any Idle or Transmit mode.
6.3.2 High/Low Image Reject Mixer (I/R Mixer)
The mixer is used to convert the desired RF channel to a 6.0 MHz Intermediate Frequency (IF). The mixer
is completely balanced on all ports, and the local oscillator (LO) is derived from the buffered output of the
on-chip voltage controlled oscillator (VCO).
In general, it is desirable to keep all image frequencies in-band. Therefore, when receiving the six lowest
channels, the mixer can be programmed for high-side injection and the LO will be programmed to be
6.0 MHz above the desired channel frequency. When receiving the six highest channels, the mixer can be
programmed for low-side injection, and the LO will be programmed to be 6.0 MHz below the desired
channel frequency. This is shown in Figure 7. Selection of high or low side injection is accomplished by
bit R2/11 of the register map. For all other in-band channels, the choice of high or low side injection is
arbitrary. The baseband uses high-side injection for frequencies up to 2.441-GHz inclusive and low-side
injection thereafter.
Table 16. S11 for LNA During Receive
Frequency
MAG
(dB)
Angle
(degree)
2.45 GHz
TBD
TBD
Table 17. S11 for LNA Disabled
Frequency
MAG
(dB)
Angle
(degree)
2.45 GHz
TBD
TBD
L
match
C
match
C
Block
LNA
F
Freescale Semiconductor, Inc.
For More Information On This Product,
n
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| MC7220C-100M RI-BLK | 制造商:Farnell / Pro-Power 功能描述:CABLE DEF 7-2-20C 20 CORE 100M |
| MC7220C-25M RI-BLK | 制造商:Farnell / Pro-Power 功能描述:CABLE DEF 7-2-20C 20CORE 25M 制造商:pro-power 功能描述:CABLE, DEF 7-2-20C, 20CORE, 25M |
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| MC7225C-25M RI-BLK | 制造商:Farnell / Pro-Power 功能描述:CABLE DEF 7-2-25C 25CORE 25M 制造商:pro-power 功能描述:MULTICORE, 25, 7/0.2MM, 25M, BLACK 制造商:pro-power 功能描述:CABLE, DEF 7-2-25C, 25CORE, 25M 制造商:PRIVATE LABEL 功能描述:CABLE, DEF 7-2-25C, 25CORE, 25M, Reel Length (Imperial):82ft, Reel Length (Metri |
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