CDCE421 Datasheet, PDF (8/30 Pages) Texas Instruments – Fully Integrated Wide-Range, Low-Jitter, Crystal-Oscillator Clock Generator

CDCE421
SCAS842 – APRIL 2007
SDATA
111
01 1
www.ti.com
FOUT
Output Oscillation
0 12
56 57 58
Output Oscillation
Enter Register
Read-Back Mode
Fetch
EEPROM
Content With
1^st CLK
EEPROM Content
1^st Bit Available After
1^st Falling Edge
60^th Falling Edge
Switches Back Into
Normal Operation
T0044-03
In the following table, the content of the output bit stream is summarized. Important to notice: bit 0 is clocked out
first.
OUTPUT BIT STREAM
Bits[0:2]
Bits[3:8]
Bit[9]
Bit[10]
Bits[11:18]
Bits[19:26]
Bits[27:34]
Bits[35:42]
Bits[43:50]
Bits[51:58]
FUNCTION
Revision identifier (MSB first)
VCO calibration word
EEPROM status:
0 = EEPROM has never been written
1 = EEPROM has been programmed before
EEPROM lock:
0 = EEPROM can be rewritten
1 = EEPROM is locked, rewriting to the EEPROM is not possible any more
Storage value, Word5 (MSB first)
Storage value, Word4 (MSB first)
Storage value, Word3 (MSB first)
Storage value, Word2 (MSB first)
Storage value, Word1 (MSB first)
Storage value, Word0 (MSB first)
REGISTER DESCRIPTION
Word 0:
BIT
NAME
DESCRIPTION/FUNCTION
0
C0
1
C1
2
C2
3
SELVCO
4
SELPRESC
5
SELPRESC
6
OUTSEL
7
OUTSEL
8
OUTSEL
9
DRVSEL
10
ILFSEL
Register selection
Register selection
Register selection
VCO select, 0 = VCO1, 1 = VCO2
Prescaler setting, bit 0
Prescaler setting, bit 1
Output divider select, bit 0
Output divider select, bit1
Output divider select, bit 2
Driver select, 0 = LVDS, 1 = PECL
Loop filter bias select
4
Divide by value (SELPRESC 1, SELPRESC 0)
5
Divide by 5 = (00), 3 = (01), 4 = (10), 2 = (11)
6
Output divider (OUTSEL2, OUTSEL1, OUTSEL0)
7
Divide by 1 = (000), 2 = (001), 4 = (010), 8 = (011), 16 = (100), 32 = (101)
8
TYPE
W
W
W
W
W
W
W
W
W
W
W
RECOMMENDED
VALUE
0
0
0
User
User
User
User
User
User
User
0
8
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