GS4915 Data Sheet
4. Typical Application Circuit
1.8V_A
1.8V_D
3.3V
3.3V
1.8V_A
1.8V_D
VCO_VDD
C1
10n
C28
10u
C22
10u
C19
10u
7
6
1
VCC
GND
VCTR
O/P
VCO_VDD
AGND
3.3V
AGND
1.8V_A
DGND2
1.8V_D
2
*Refer to Table 3-1 in
Section 3.3.3 for R & C
GO1555
GND
NC
R16
150K
C15
0.1u
C16
0.1u
C17
0.1u
C18
0.1u
C11
0.1u
C12
0.1u
C13
0.1u
C14
0.1u
Loop Filter component
values.
5
3
R1*
C2*
R15
150K
AGND
Pin 7
DGND2
Pin 25
AGND
DGND2
Pin 15
AGND
Pin 1
AGND
Pin 23
AGND
Pin 3
AGND
Pin 32
U1
GO1525
Pin 27
VCO_GND
VCO_GND
Controlled impedance 50-ohms
VCO_GND
VCO_VDD
C10 0.1u
1u
VCO_GND
VCO_GND
C6 10n
1.8V_A
R5
10K
U2
AGND
AGND
3.3V
1
2
30
29
28
27
26
25
24
23
22
21
REG_VDD
AGND
CLKOUT
CLKOUT
PCLK
PCLK
AGND
Zo = 100 ohms differential
1.8V_A
3
PCLKIN
PCLKIN
PD_VDD
CLKIN
I.8V_D
1.8V_D
3.3V
4
DIFF_OUT_VDD
AGND
Zo
= 100 ohms differential
R6
100R
5
CLKIN
6
GS4915
AGND
D_VDD
1.8V_D
7
PCLK_SE
LOCK
IN_VDD
CLKIN_SE
AGND
CLKOUT_SE
SE_VDD
GND
8
PCLKIN_SE
9
10
RESET
LOCK
GND_PAD
AGND
RESET
IPSEL
R8
0R
DGND2
DGND2
VCO_GND
AGND
BYPASS
MAN/AUTOb
CTRL0
CTRL1
DOUBLE
SKEW_EN
Figure 4-1: GS4915 Typical Application Circuit
39145 - 3 November 2007
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