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CS2300P-CZZR 데이터시트(PDF) 10 Page - Cirrus Logic

부품명 CS2300P-CZZR
상세설명  Fractional-N Clock Multiplier with Internal LCO
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제조업체  CIRRUS [Cirrus Logic]
홈페이지  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

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CS2300-OTP
10
DS844PP1
5. APPLICATIONS
5.1
One Time Programmability
The one time programmable (OTP) circuitry in the CS2300-OTP allows for pre-configuration of the device
prior to use in a system. There are two types of parameters that are used for device pre-configuration: modal
and global. The modal parameters are features which, when grouped together, create a modal configuration
set (see Figure 14 on page 20). Up to four modal configuration sets can be permanently stored and then
dynamically selected using the M[1:0] mode select pins (see Table 1). The global parameters are the re-
maining configuration settings which do not change with the mode select pins. The modal and global pa-
rameters can be pre-set at the factory or user programmed using the customer development kit, CDK2000;
Please see “Programming Information” on page 25 for more details.
Table 1. Modal and Global Configuration
5.2
Timing Reference Clock
The internal LC oscillator is used to generate the timing reference clock. A single 0.1 µF cap must be con-
nected between the FILTP and FILTN pins and FILTN must be connected to ground as shown in Figure 4.
5.3
Frequency Reference Clock Input, CLK_IN
The frequency reference clock input (CLK_IN) is used by the Digital PLL and Fractional-N Logic block to
dynamically generate a fractional-N value for the Frequency Synthesizer (see “Hybrid Analog-Digital PLL”
on page 9). The Digital PLL first compares the CLK_IN frequency to the PLL output. The Fractional-N logic
block then translates the desired ratio based off of CLK_IN to one based off of the internal LCO. This allows
the low-jitter internal LCO to be used as the clock which the Frequency Synthesizer multiplies while main-
taining synchronicity with the frequency reference clock through the Digital PLL. The allowable frequency
range for CLK_IN is found in the “AC Electrical Characteristics” on page 7.
5.3.1
CLK_IN Skipping Mode
CLK_IN skipping mode allows the PLL to maintain lock even when the CLK_IN signal has missing pulses
for up to 20 ms (tCS) at a time (see “AC Electrical Characteristics” on page 7 for specifications). CLK_IN
skipping mode can only be used when the CLK_IN frequency is below 80 kHz. The ClkSkipEn global pa-
rameter enables this function.
Parameter Type
M[1:0] pins = 00
M[1:0] pins = 01
M[1:0] pins = 10
M[1:0] pins = 11
Modal
Configuration Set 0
Ratio 0
Configuration Set 1
Ratio 1
Configuration Set 2
Ratio 2
Configuration Set 3
Ratio 3
Global
Configuration settings set once for all modes.
Figure 4. External Component Requirements for LCO
FILTN
FILTP
0.1 µF


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