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參數(shù)資料
| 型號： | ZL10355QCG1 |
| 廠商： | ZARLINK SEMICONDUCTOR INC |
| 元件分類： | 消費家電 |
| 英文描述： | Nordig Unified DVB-T COFDM Terrestrial Demodulator for PC-TV and Hand-held Digital TV(DTV) |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封裝： | 7 X 7 MM, 1.40 MM HEIGHT, LEAD FREE, MS-026BBD, LQFP-64 |
| 文件頁數(shù)： | 21/26頁 |
| 文件大?。?/td> | 456K |
| 代理商： | ZL10355QCG1 |
ZL10355
Data Sheet
21
Zarlink Semiconductor Inc.
Figure 10 - Crystal Oscillator Circuit
4.4.1 Selection of External Components
The capacitor values used must ensure correct operation of the Pierce oscillator such that the total loop gain is
greater than unity. Correct selection of the two capacitors is very important and the following method is
recommended to obtain values for C1 and C2.
4.4.1.1 Loop Gain Equation
Although oscillation may still occur if the loop gain is just above 1, a loop gain of between 5 and 25 is optimum to
ensure that oscillations will occur across all variations in temperature, process and supply voltage, and that the
circuit will exhibit good start-up characteristics.
Equation 1 -
Equation 2 -
4.4.1.2 List of Equation Parameters
A
total loop gain (between 5 and 25)
Cin
C1 + Cpar
Cout
C2 + Cpar
Cpar
parasitic capacitance associated with each oscillator pin (XTI and XTO). It consists of track
capacitances, package capacitance and cell input capacitance. Normally Cpar
≈
4pF.
9.143 k
- output impedance of amplifier at 1.8 V operation - typical
Zo
gm
8.736 mA/V - transconductance of amplifier at 1.8 V operation -typical
Rf
2.3 M
- internal feedback resistor
ESR
maximum equivalent series resistance of crystal - given by crystal manufacturer (
)
f
fundamental frequency of crystal (Hz)
XTI
XT0
XTI
C2
OSCMODE
C1
- A =
C
out
.g
m
C
in
C
out
+ C
in
R
f
.C
in
+
1
Z
in
-1
1
Z
o
+
- Z
in
=
1
(2.
π
.f.C
out
)
2
.ESR
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