CS2200-OTP_09 Datasheet, PDF (17/24 Pages) Cirrus Logic – Fractional-N Frequency Synthesizer

CS2200-OTP
6. PARAMETER DESCRIPTIONS
As mentioned in Section 5.1 on page 9, there are two different kinds of parameter configuration sets, Modal and
Global. These configuration sets, shown in Figure 10, can be programmed in the field using the CDK2000 or pre-
programmed at the factory. Please see “Programming Information” on page 21 for more details.
M[1:0] pins
Modal Configuration Set #0
Ratio 0
RModSel[1:0]
AuxOutSrc[1:0]
00
Modal Configuration Set #1
Ratio 1
RModSel[1:0]
AuxOutSrc[1:0]
01
Modal Configuration Set #2
Ratio 2
RModSel[1:0]
AuxOutSrc[1:0]
10
Modal Configuration Set #3
Ratio 3
RModSel[1:0]
AuxOutSrc[1:0]
11
Global Configuration Set
AuxLockCfg
RefClkDiv[1:0]
ClkOutUnl
M2Config[2:0]
Figure 10. Parameter Configuration Sets
6.1 Modal Configuration Sets
There are four instances of each of these configuration parameters. Selection between the four stored sets
is made using the M[1:0] pins.
6.1.1
R-Mod Selection (RModSel[1:0])
Selects the R-Mod value, which is used as a factor in determining the PLL’s Fractional N.
RModSel[1:0]
00
01
10
11
Application:
R-Mod Selection
Right-shift R-value by 1 (÷ 2).
Right-shift R-value by 2 (÷ 4).
Right-shift R-value by 3 (÷ 8).
Right-shift R-value by 4 (÷ 16).
“Ratio Modifier (R-Mod)” on page 11
Note: This parameter does not take affect unless M2 pin is high and the M2Config[2:0] global param-
eter is set to ‘011’.
DS842F1
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