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CS2200-OTP 数据表(PDF) 9 Page - Cirrus Logic

部件名 CS2200-OTP
功能描述  Fractional-N Frequency Synthesizer
Download  22 Pages
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制造商  CIRRUS [Cirrus Logic]
网页  http://www.cirrus.com
标志 CIRRUS - Cirrus Logic

CS2200-OTP 数据表(HTML) 9 Page - Cirrus Logic

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CS2200-OTP
DS842PP1
9
5. APPLICATIONS
5.1
One Time Programmability
The one time programmable (OTP) circuitry in the CS2200-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 9 on page 16). Up to four modal configuration sets can be permanently stored and then dy-
namically selected using the M[1:0] mode select pins (see Table 1). The global parameters are the remain-
ing configuration settings which do not change with the mode select pins. The modal and global parameters
can be pre-set at the factory or user programmed using the customer development kit, CDK2000; Please
see “Programming Information” on page 20 for more details.
Table 1. Modal and Global Configuration
5.2
Timing Reference Clock Input
The low jitter timing reference clock (RefClk) can be provided by either an external reference clock or an
external crystal in conjunction with the internal oscillator. In order to maintain a stable and low-jitter PLL out-
put the timing reference clock must also be stable and low-jitter; the quality of the timing reference clock
directly affects the performance of the PLL and hence the quality of the PLL output.
5.2.1
Internal Timing Reference Clock Divider
The Internal Timing Reference Clock (SysClk) is limited to a lower maximum frequency than that allowed
on the XTI/REF_CLK pin. The CS2200-OTP supports the wider external frequency range by offering an
internal divider for RefClk. The RefClkDiv[1:0] global parameter should be configured such that SysClk,
the divided RefClk, then falls within the valid range as indicated in Figure 3.
It should be noted that the maximum allowable input frequency of the XTI/REF_CLK pin is dependent
upon its configuration as either a crystal connection or external clock input. See the “AC Electrical Char-
acteristics” on page 7 for more details.
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.
Referenced Control
Parameter Definition
RefClkDiv[1:0] ....................... “Reference Clock Input Divider (RefClkDiv[1:0])” on page 17
Figure 3. Internal Timing Reference Clock Divider
N
Internal Timing
Reference Clock
PLL Output
Fractional-N
Frequency
Synthesizer
Timing Reference
Clock Divider
÷1
÷2
÷4
XTI/REF_CLK
RefClkDiv[1:0]
8 MHz < SysClk < 18.75 MHz
8 MHz < RefClk <
Timing Reference Clock
50 MHz (XTI)
75 MHz (REF_CLK)


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