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)： 34/156頁
文件大小： 1782K
代理商： MC72000
34
MC72000 Advance Information Data Sheet
Go to: www.freescale.com
MOTOROLA
Radio Functional Description
Figure 7. 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 deassertion of the RTXEN pin or during any Idle or
Transmit mode.
6.3.3 Bandpass Filter (BPF)
The 6.0 MHz bandpass filter is used to block undesired channels. The filter is self-adjusting and is
calibrated during each receive cycle, based on an internally generated 6.0 MHz signal. The gain of the
filter is fixed at 4.0 dB.
The nominal pass band for the filter is 720 kHz. This deliberately low pass band can cause significant
intersymbol interference (ISI) issues for a GFSK modulated signal with a 1 Mbit/s data rate. The
advantages are increased sensitivity, adjacent channel interference performance, and ease of manufacture.
Due to this low pass band, a digitally implemented decoder scheme is utilized to eliminate ISI. This is
referenced as the JD/MLSE and is incorporated into all Motorola Bluetooth basebands.
The BPF is enabled approximately 10 μs after the assertion of the RTXEN pin while programmed for
Receive mode and automatic tuning is complete after approximately 140 μs. It is disabled immediately
after the deassertion of the RTXEN pin or during any Idle or Transmit mode.
6.3.4 Limiter with Received Signal Strength Indicator (RSSI)
The received signal strength indicator (RSSI) is integrated into the limiter. The RSSI ADC converts the
RSSI current into a 4-bit digital signal. When the RSSI enable (R4/6) and RSSI Read Enable (R9/8) are
both set, the 4-bit RSSI conversion value can be read from the MC72000 Radio Register Map (R29/3-0)
while in Idle mode. The RSSI is updated approximately 40 μs after receiving the first bit in a receive cycle.
Enabling RSSI will result in additional current consumption as noted in the Receiver AC Electrical
Specifications shown in Table 8. Figure 8 shows the RSSI conversion value versus the RF level input to
the LNA at various temperatures. Figure 9 shows the RSSI conversion versus the RF level at different
power supplies.
High-side LO injection (R2/11=1)
LO
Image
RF
Low-side LO injection (R2/11 = 0)
LO
RF
Image
F
For More Information On This Product,
n
.
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