Si5338-RM
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 13
Rev. 1.4 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 2021
4.1. Reference Clock Select
In this section, the configurations for all the muxes within the Reference Select area of Figure 6 are described.
Figure 7. Reference Input Configuration Registers
28[7:0]
01
XTAL_FREQ[1:0]
01234567
P1DIV_IN[2:0]
29[7:0]
01234567
P1DIV_IN[4:3]
P1DIV[2:0]
000
001
010
011
100
/1
P1 divider setting
/2
/4
/8
/16
101
/32
P2DIV[2:0]
000
001
010
011
100
/1
P2 divider setting
/2
/4
/8
/16
101
/32
29[7:0]
P1DIV[2:0]
01234567
PFD_IN_REF[2:0]
30[7:0]
P2DIV[2:0]
01234567
PFD_IN_FB[2:0]
XTAL_FREQ[1:0]
11
10
01
Crystal Frequency
00
26 MHz < Fxtal <= 30 MHz
19 MHz < Fxtal <= 26 MHz
8 MHz < Fxtal <= 11 MHz
11 MHz < Fxtal <= 19 MHz
* If IN1/IN2 (XTAL) is selected, XTAL_FREQ must be
configured. Otherwise XTAL_FREQ is a don’t care
P1DIV_IN[2:0]
00
10
01
IN1/IN2 (differential)
Reference Clock P1DIV_IN[4:3]
000
101
010
IN1/IN2 (XTAL)*
IN3 (single-ended)
PFD_IN_FB[2:0]
000
001
010
011
p2div_in (fbclk)
Input to PFD
Feedback Side
p1div_in (refclk)
p2div_out (divfbclk)
p1div_out (divrefclk)
100
reserved
101
noclk
PFD_IN_REF[2:0]
000
001
010
011
100
p1div_in (refclk)
Input to PFD
Reference Side
p2div_in (fbclk)
p1div_out (divrefclk)
p2div_out (divfbclk)
xoclk
101
noclk
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