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參數(shù)資料
| 型號： | MC13180 |
| 廠商： | MOTOROLA INC |
| 元件分類： | 通信及網(wǎng)絡(luò) |
| 英文描述： | 2.4 GHz Low Power Wireless Transceiver IC for Bluetooth⑩ Applications |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PQCC48 |
| 封裝： | PLASTIC, QFN-48 |
| 文件頁數(shù)： | 41/58頁 |
| 文件大?。?/td> | 992K |
| 代理商： | MC13180 |
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Functional Description
MOTOROLA
MC13180
Product Preview
41
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
μ
s after the assertion of the RTXEN pin when programmed for
Receive mode. It is disabled immediately after the de
-
assertion of the RTXEN pin or during any Idle or
Transmit mode.
4.29 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 desired to keep all image frequencies in
-
band. Therefore, when receiving the 6 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 6 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 illustrated in Figure 25. 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, although it is recommended to use high
-
side injection for frequencies to 2.440 GHz and low
-
side
injection thereafter.
Figure 25. High-Side and Low-Side Mixer Injection
The mixer delivers approximately 15.8 dB of voltage gain and 22 dB of image rejection.
The mixer is enabled approximately 150
μ
s after the assertion of the RTXEN pin when programmed for
Receive mode. It is disabled immediately after the de
-
assertion of the RTXEN pin or during any Idle or
Transmit mode.
4.30 Post Mixer Amplifier (PMA)
Once the desired RF channel has been down converted to the IF frequency, the PMA is used to deliver 12
dB of additional gain prior to feeding the signal into the bandpass filter.
The PMA is enabled approximately 10
μ
s after the assertion of the RTXEN pin when programmed for
Receive mode. It is disabled immediately after the de
-
assertion of the RTXEN pin or during any Idle or
Transmit mode.
High-side LO injection (R2/11=1)
LO
Image
RF
Low-side LO injection (R2/11 = 0)
LO
RF
Image
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