GS4915 Data Sheet
4. Typical Application Circuit
1.8V_A
1.8V_A
1.8V_D
1.8V_D
3.3V
3.3V
VCO_VDD
C1
10n
AGND
1.8V_A
C13
0.1u
C14
0.1u
DGND2
1.8V_D
C15
0.1u
C16
0.1u
C17
0.1u
C18
0.1u
AGND
3.3V
C11
0.1u
C12
0.1u
VCO_VDD
R16
150K
*Refer to Table 3-1 in
Section 3.3.3 for R & C
Loop Filter component
values.
7
6
5
GND
C19
10u
C22
10u
C28
10u
8
VCC
O/P
1
2
3
GND GO1555 GND
VCTR
NC
AGND
Pin 3
AGND
Pin 32
AGND
Pin 7
DGND2
Pin 25
AGND
Pin 27
DGND2
Pin 15
AGND
Pin 1
AGND
Pin 23
C2*
VCO_GND
VCO_GND
VCO_GND
Controlled impedance 50-ohms
VCO_VDD
C10 0.1u
1u
VCO_GND
VCO_GND
C6 10n
R5
10K
1.8V_A
37
35
34
39
33
40
32
U2
AGND
36
38
31
AGND
VCO_GND
VCO_VDD
3.3V
1
2
DIV_VDD
CP_VDD
CP_RES
AGND
VCO
VCO
LF
AGND
REG_VDD
AGND
PD_VDD
CLKIN
CLKIN
AGND
IN_VDD
CLKIN_SE
AGND
AGND
CLKOUT
CLKOUT
DIFF_OUT_VDD
AGND
30
29
28
27
26
25
24
23
22
21
LOCK
3.3V
1.8V_D
4
R15
150K
R1*
U1
GND
GO1525
PCLK
Z
o
= 100 ohms differential
PCLK
I.8V_D
PCLKIN
Z
o
= 100 ohms differential
PCLKIN
R6
100R
1.8V_A
3
4
5
6
GS4915
D_VDD
CLKOUT_SE
SE_VDD
GND
1.8V_D
7
8
9
10
PCLK_SE
PCLKIN_SE
AUTOBYPASS
RESET
GND_PAD
LOCK
SKEW_EN
19
DOUBLE
FCTRL0
FCTRL1
BYPASS
D_VDD
IPSEL
GND
11
12
13
14
15
16
17
18
RESET
R8
0R
IPSEL
BY PASS
MAN/AUTOb
CTRL0
CTRL1
DOUBLE
SKEW_EN
1.8V_D
DGND2
DGND2
20
AGND
GND
VCO_GND
AGND
Figure 4-1: GS4915 Typical Application Circuit
39145 - 3
November 2007
22 of 26
GENNUM [ GENNUM CORPORATION ]
