參數(shù)資料
型號： MSP3430
廠商： Electronic Theatre Controls, Inc.
英文描述： Multistandard Sound Processor Family
中文描述： 多標準聲音處理器系列
文件頁數(shù)： 61/101頁
文件大小： 752K
代理商： MSP3430
PRELIMINARY DATA SHEET
MSP 34x0G
Micronas
61
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 value should be determined with the customer PCB. The suggested values (1.5...3.3 pF) are
figures based on experience and should serve as
“
start value
”
.
To adjust the capacitor value, reset the MSP. After the reset, no I
2
C telegrams should be transmitted. Measure
the frequency at AUD_CL_OUT-pin. Change the capacitor value until the free running frequency matches
18.432 MHz as closely as possible. The higher the capacity, the lower the resulting clock frequency.
Note:
To minimize adjustment tolerances for all MSP-generations, it is strongly recommended to use the so-called
MSP-XTAL-REF ICs (available in all packages) for the capacitor adjustment.
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