MSP3411G Datasheet, PDF (64/102 Pages) Micronas – Multistandard Sound Processor Family with Virtual Dolby Surround

MSP 34x1G
PRELIMINARY DATA SHEET
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
Ω
C₀
Crystal Shunt (Parallel) Capacitance
6.2
7.0
pF
C_L
External Load Capacitance¹⁾
XTAL_IN,
PSDIP approx. 1.5
pF
XTAL_OUT
PLCC approx. 3.3
pF
P(L)QFP approx. 3.3
pF
Crystal Recommendations for Master-Slave Applications (MSP-clock must perform synchronization to I²S clock)
f_TOL
D_TEM
Accuracy of Adjustment
Frequency Variation
versus Temperature
−20
+20
ppm
−20
+20
ppm
C₁
Motional (Dynamic) Capacitance
19
24
fF
f_CL
Required Open Loop Clock
AUD_CL_OUT 18.431
18.433 MHz
Frequency (T_amb = 25 °C)
Crystal Recommendations for FM / NICAM Applications (No MSP-clock synchronization to I²S clock possible)
f_TOL
D_TEM
Accuracy of Adjustment
Frequency Variation
versus Temperature
−30
+30
ppm
−30
+30
ppm
C₁
Motional (Dynamic) Capacitance
15
fF
f_CL
Required Open Loop Clock
AUD_CL_OUT
18.4305
18.4335 _MHz
Frequency (T_amb = 25 °C)
Crystal Recommendations for all analog FM/AM Applications (No MSP-clock synchronization to I²S clock possible)
f_TOL
D_TEM
Accuracy of Adjustment
Frequency Variation
versus Temperature
−100
−50
+100 ppm
+50
ppm
f_CL
Required Open Loop Clock
AUD_CL_OUT 18.429
18.435 MHz
Frequency (T_amb = 25 °C)
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.
64
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