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參數(shù)資料
| 型號： | LMX9820A |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Bluetooth Serial Port Module |
| 中文描述： | 藍(lán)牙串行端口模塊 |
| 文件頁數(shù)： | 20/44頁 |
| 文件大?。?/td> | 579K |
| 代理商： | LMX9820A |
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20
Revision 1.0
L
8.0 Digital Smart Radio
(Continued)
TEW Crystal
The LMX9820A has been tested with the TEW TAS-4025A
crystal, see Table 21 on page 20 for specification.
Because the internal capacitance of the crystal circuit is 8
pF and the load capacitance is 16 pF, 12 pF is a good start-
ing point for both Ct1 and Ct2. The 2480 MHz RF fre-
quency offset is then tested. Figure 12 on page 21 shows
the RF frequency offset test results.
Figure 12 on page 21 shows the results are -20 kHz off the
center frequency, which is -1 ppm. The pullability of the
crystal is 2 ppm/pF, so the load capacitance must be
decreased by about 1.0 pF. By changing Ct1 or Ct2 to
10 pF, the total load capacitance is decreased by 1.0 pF.
Figure 13 on page 21 shows the frequency offset test
resuts. The frequency offset is now zero with Ct1 = 10 pF,
Ct2 = 10 pF.
Reference Table 22 on page 20 for crystal tuning values
used on Austin Development Board with TEW crystal.
Table 21. TEW TAS-4025A
Specification
Value
Package
4.0 x 2.5 x 0.65 mm (4 pads)
Frequency
12.000 MHz
Mode
Fundamental
Stability
>15 ppm @ -40 to +85°C
C
L
Load Capacitance
16 pF
ESR
80
max.
C
0
Shunt Capacitance
5 pF
Drive Level
50 ±10uV
Pullability
2 ppm/pF min
Storage Temperature
-40 to +85°C
Table 22. TEW on Arizona Board
Reference
LMX9820A
Ct1
10 pF
Ct2
10 pF
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| LMX9820ADEV | 制造商:Texas Instruments 功能描述:KIT DEV FOR LMX9820 |
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