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| 型號： | MSP34X1G |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Multistandard Sound Processor Family with Virtual Dolby Surround |
| 中文描述： | 多標(biāo)準(zhǔn)聲音處理器系列與虛擬杜比環(huán)繞聲 |
| 文件頁數(shù)： | 65/104頁 |
| 文件大小： | 871K |
| 代理商： | MSP34X1G |
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PRELIMINARY DATA SHEET
MSP 34x1G
Micronas
65
4.6.2.4. Crystal Recommendations
Symbol
Parameter
Pin Name
Min.
Typ.
Max.
Unit
General Crystal Recommendations
f
P
Crystal Parallel Resonance Fre-
quency at 12 pF Load Capacitance
18.432
MHz
R
R
Crystal Series Resistance
8
25
C
0
Crystal Shunt (Parallel) Capacitance
6.2
7.0
pF
C
L
External Load Capacitance
1)
XTAL_IN,
XTAL_OUT
PSDIP
P(L)QFP approx. 3.3
approx. 1.5
pF
pF
Crystal Recommendations for Master-Slave Applications
(MSP-clock must perform synchronization to I
2
S clock)
f
TOL
Accuracy of Adjustment
20
+
20
ppm
D
TEM
Frequency Variation
versus Temperature
20
+
20
ppm
C
1
Motional (Dynamic) Capacitance
19
24
fF
f
CL
Required Open Loop Clock
Frequency (T
amb
= 25
°
C)
AUD_CL_OUT
18.431
18.433
MHz
Crystal Recommendations for FM / NICAM Applications
(No MSP-clock synchronization to I
2
S clock possible)
f
TOL
Accuracy of Adjustment
30
+
30
ppm
D
TEM
Frequency Variation
versus Temperature
30
+
30
ppm
C
1
Motional (Dynamic) Capacitance
15
fF
f
CL
Required Open Loop Clock
Frequency (T
amb
= 25
°
C)
AUD_CL_OUT
18.4305
18.4335
MHz
Crystal Recommendations for all analog FM/AM Applications
(No MSP-clock synchronization to I
2
S clock possible)
f
TOL
Accuracy of Adjustment
100
+
100
ppm
D
TEM
Frequency Variation
versus Temperature
50
+
50
ppm
f
CL
Required Open Loop Clock
Frequency (T
amb
= 25
°
C)
AUD_CL_OUT
18.429
18.435
MHz
Amplitude Recommendation for Operation with External Clock Input
(C
load
after reset typ. 22 pF)
V
XCA
External Clock Amplitude
XTAL_IN
0.7
V
pp
1)
External capacitors at each crystal pin to ground are required. They are necessary to tune the open-loop fre-
quency of the internal PLL and to stabilize the frequency in closed-loop operation.
Due to different layouts, the accurate capacitor size should be determined with the customer PCB. The sug-
gested values (1.5...3.3 pF) are figures based on experience and should serve as
“
start value
”
.
To define the capacitor size, reset the MSP without transmitting any further I2C telegrams. Measure the fre-
quency at AUD_CL_OUT-pin. Change the capacitor size until the free running frequency matches 18.432 MHz
as closely as possible. The higher the capacity, the lower the resulting clock frequency.
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