參數(shù)資料
型號(hào)： LMX9830SM
廠(chǎng)商： NATIONAL SEMICONDUCTOR CORP
元件分類(lèi)： 通信及網(wǎng)絡(luò)
英文描述： BluetoothTM Serial Port Module
中文描述： SPECIALTY TELECOM CIRCUIT, PBGA60
封裝： 9 X 6 MM, 1.20 MM HEIGHT, 0.80 MM PITCH, PLASTIC, FBGA-60
文件頁(yè)數(shù)： 24/46頁(yè)
文件大?。?/td> 664K
代理商： LMX9830SM
www.national.com
24
L
9.0 Digital Smart Radio
(Continued)
9.7.2 TCXO (Temperature Compensated Crystal
Oscillator)
The LMX9830 also can operate with an external TCXO
(Temperature Compensated Crystal Oscillator). The TCXO
signal is directly connected to the CLK+.
1. Input Impedance
The LMX9830 CLK+ pin has in input impedance of 2pF
capacitance in parallel with >400k
resistance
9.7.3 Optional 32 kHz Oscillator
A second oscillator is provided (see Figure 16) that is tuned
to provide optimum performance and low-power consump-
tion while operating with a 32.768 kHz crystal. An external
crystal clock network is required between the 32kHz_CLKI
clock input (pad B13) and the 32kHz_CLKO clock output
(pad C13) signals.The oscillator is built in a Pierce configu-
ration and uses two external capacitors. Table 21 provides
the oscillator’s specifications.
In case the 32Khz is placed optionally, it is recommended
to remove C2 and replace C1 with a zero ohm resistor.
Figure 16. 32.768 kHz Oscillator
9.7.4 ESR (Equivalent Series Resistance)
LMX9830 can operate with a wide range of crystals with
different ESR ratings. Reference Table 22 on page 24 and
Figure 17 on page 25 for more details.
C1
C2
32kHz_CLKI
32kHz_CLKO
GND
32.768 kHz
Table 21. 32.768 kHz Oscillator Specifications
Symbol
Parameter
Condition
Min
Typ
Max
Unit
V
DD
Supply Voltage
1.62
1.8
1.98
V
I
DDACT
Supply Current (Active)
2
μA
f
Nominal Output Frequency
32.768
kHz
V
PPOSC
Oscillating Amplitude
1.8
V
Duty Cycle
40
60
%
Table 22. System Clock Requirements
Parameter
Min
Typ
Max
Unit
External Reference Clock Frequency
1
10
13
20
MHz
Frequency Tolerance (over full operating temperature and aging)
-20
+15
+20
ppm
Crystal Serial Resistance
230
External Reference Clock Power Swing, pk to pk
100
200
400
mV
Aging
±1
ppm per year
1.
Supported frequencies
from external oscillator
(in MHz): 10.00, 10.368, 12.00, 12.60, 12.80, 13.00, 13.824, 14.40,
15.36, 16.00, 16.20, 16.80, 19.20, 19.68, 19.80
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