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)： 37/156頁
文件大?。?/td> 1782K
代理商： MC72000
MOTOROLA
MC72000
Advance Information Data Sheet
Go to: www.freescale.com
37
6.4 Transmitter
The MC72000 uses a direct launch transmitter taken from the output of the local oscillator (LO). During a
transmit cycle the VCO of the LO is automatically trimmed. Following the LO are the output power stages,
sequenced in the proper order. To minimize splattering, the output of the programmable low power
amplifier (LPA) drives a balanced ramp up/ramp down generator, which is fed to a “Balun” to provide a
single-ended output for the external antenna switch. The transmit start up/warm down sequences are
shown in Figure 30.
6.4.1 Transmit Synchronization Delay
A programmable delay exists between the rising edge of RTXEN and the first available bit of on-the-air
data during a transmit cycle. This delay range is TX
sync
and is set via Radio Register Map bits of Transmit
Synchronization Time Delay Value (R8/15-8) where the decimal value represents the delay in
microseconds. Packet data is seen at the antenna approximately 2.5 μs after this delay. All Bluetooth
packets require a minimum of four preamble bits of pattern 0101 or 1010. For minimum power
consumption, set the delay to TX
sync
minimum. If additional settling time or preamble bits are required,
manipulate the delay as necessary, up to TX
sync
maximum.
Figure 15. C/I Performance for Channel 39 (2.405 GHz, High-Side Injection)
Figure 16. C/I Performance vs. Temperature
-60
-50
-40
-30
-20
-10
0
10
-15
-10
-5
0
5
10
15
INTERFERER FREQUENCY DELTA (MHz)
I
T
A
= 25° C
-60
-50
-40
-30
-20
-10
0
10
-3
-1
1
3
5
7
9
11
13
15
INTERFERER FREQUENCY DELTA (MHz)
I
T
A
= 85° C
T
A
= -40° C
F
Freescale Semiconductor, Inc.
For More Information On This Product,
n
.
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