HFC-SUSB Cologne Chip AG, HFC-SUSB Datasheet - Page 68

• Manufacturer Part Number: HFC-SUSB
• Description: Isdn S/t HDLC Basic Rate Controller
• Manufacturer: Cologne Chip AG

863 C EC2
7.2
7.2.1 Oscillator circuitry with coil
Figure 10: Oscillator circuitry for USB clock
7.2.2 Oscillator circuitry without coil
Figure 11: Oscillator circuitry for USB clock
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C LK U S B I
C LK U S B I
G N D
G N D
C Q 2
C 1
R Q 1
Oscillator circuitry for USB clock
R 1
Q 1
48 MH z
Q 1
48 MH z
C LK U S B O
C LK U S B O
G N D
G N D
C Q 1
C Q 3
R Q 2
C 2
R 2
G N D
L1
C 3
Part List
Name
R1
R2
C1
C2
C3
L1
Q1
L1 and C3 are only needed if Q1 is an
overtone quartz.
The values of C1, C2, C3, L1 and R1, R2
depend on the used quartz.
Part List
Name
RQ1
RQ2
CQ1
CQ2
CQ3
Q1
The values of CQ1, CQ2, CQ3, RQ1,
RQ2 depend on the used quartz.
This circuitry might not work with all
quartzes. Use the circuitry with coil in
this case (see above).
Value
4.7 M
22..56
22 pF
22 pF
4.7 nF
0.56 µH
48.000 MHz
Value
4.7 M
680
22 pF
22 pF
4.7 nF
48.000 MHz
Cologne
Chip
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