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CDCM6208V1FRGZR Datasheet(PDF) 57 Page - Texas Instruments

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Part No. CDCM6208V1FRGZR
Description  2:8 Clock Generator, Jitter Cleaner with Fractional Dividers
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

CDCM6208V1FRGZR Datasheet(HTML) 57 Page - Texas Instruments

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RESET=low
CDCM6208
Step 1
SPI or I2C
Master
GPO
Configure
Registers
0 to 21
CDCM6208
Step 2
SPI or I2C
Master
GPO
Release
RESET
50k
DVDD
RESET=high
50k
DVDD
Register
Space
Register
Space
CDCM6208V1F
www.ti.com
SCAS943 – MAY 2015
Typical Applications (continued)
11.2.1.4 Preventing False Output Frequencies in SPI/I2C Mode at Startup:
Some systems require a custom configuration and cannot tolerate any output to start up with a wrong frequency.
Holding RESET low at power-up until the device is fully configured keeps all outputs disabled. The device
calibrates automatically after RESET becomes released and starts out with the desired output frequency.
NOTE
The RESETN pin cannot be held low during I2C communication. Instead, use the SYNC
pin to disable the outputs during an I2C write operation, and toggle RESETN pin
afterwards. Alternatively, other options exist such as using the RESETN bit in the register
space to disable outputs until the write operation is complete.
Figure 41. Reset Pin Control During Register Loading
11.2.1.5 Power Down
When the PDN pin = 0, the device enters a complete power down mode with a current consumption of no more
than 1 mA from the entire device.
11.2.1.6 Device Power Up Timing:
Before the device outputs turn on after power up, the device goes through the following initialization routine:
Table 35. Initialization Routine
STEP
DURATION
COMMENTS
Depends on customer supply
The POR monitor holds the device in power-down or reset until the
Step 1: Power up ramp
ramp time
VDD supply voltage reaches 1.06 V (min) to 1.26 V (max)
Depends on XTAL. Could be
This step assumes RESETN = 1 and PDN = 1.The XTAL startup
several ms;
time is the time it takes for the XTAL to oscillate with sufficient
Step 2: XO startup (if crystal is
For NX3225GA 25 MHz typical
amplitude. The CDCM6208V1F has a built-in amplitude detection
used)
XTAL startup time measures 200
circuit, and holds the device in reset until the XTAL stage has
µs.
sufficient swing.
Copyright © 2015, Texas Instruments Incorporated
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