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CSP1027 Datasheet(PDF) 39 Page - Agere Systems

Part # CSP1027
Description  CSP1027 Voice Band Codec for Cellular Handset and Modem Applications
PDF  64 Pages
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Manufacturer  AGERE [Agere Systems]
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CSP1027 Datasheet(HTML) 39 Page - Agere Systems

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Lucent Technologies Inc.
Data Sheet
CSP1027 Voice Band Codec for
December 1999
Cellular Handset and Modem Applications
39
7 Application Information (continued)
Figure 31. Negative Resistance of Crystal Oscillator Circuit, VDD = 4.75 V
Figure 32. Negative Resistance of Crystal Oscillator Circuit, VDD = 3.0 V
5-7610 (F)
0
–20
–40
–60
–80
–100
–120
–140
–200
5
1015
202530
354045
50
FREQUENCY (MHz)
–160
–180
CEXT =
50 pF
XLO
XHI
C1
C2
C0
Z(
ω)
C1 = C2 = CEXT
PROC
5.0 V
3.0 V
5.0 V
3.0 V
5.0 V
3.0 V
CEXT
10 pF
10 pF
20 pF
20 pF
50 pF
50 pF
C0 = PARASITIC CAPACITANCE OF
CRYSTAL (7 pF MAXIMUM)
CEXT =
10 pF
CEXT =
20 pF
5-7611 (F)
0
–20
–40
–60
–80
–100
–120
–140
–200
6
1014182226303438
FREQUENCY (MHz)
–160
–180
XLO
XHI
C1
C2
C0
Z(
ω)
C1 = C2 = CEXT
PROC
5.0 V
3.0 V
5.0 V
3.0 V
5.0 V
3.0 V
CEXT
10 pF
10 pF
20 pF
20 pF
50 pF
50 pF
8
12162024283236
40
CEXT =
50 pF
C0 = PARASITIC CAPACITANCE OF
CRYSTAL (7 pF MAXIMUM)
CEXT =
10 pF
CEXT =
20 pF



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