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CDCM6208V2RGZR データシート(PDF) 11 Page - Texas Instruments

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部品番号 CDCM6208V2RGZR
部品情報  2:8 CLOCK GENERATOR, JITTER CLEANER WITH FRACTIONAL DIVIDERS
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メーカー  TI [Texas Instruments]
ホームページ  http://www.ti.com
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CDCM6208V2RGZR データシート(HTML) 11 Page - Texas Instruments

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CDCM6208
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SCAS931A – MAY 2012 – REVISED JUNE 2012
CRYSTAL INPUT CHARACTERISTICS (SEC_REF)
VDD_SEC = 1.71 TO 1.89 V, 2.375 V TO 2.625 V, 3.135 V TO 3.465 V,TA = -40°C TO 85°C
PARAMETER
MINI
TYP
MAX
UNITS
Mode of Oscillation
Fundamental
See note (1)
10
30.72
MHz
Frequency
See note (2)
30.73
50
MHz
10 MHz
150(3)
Equivalent Series Resistance (ESR)
25 MHz
70(4)
Ω
50 MHz
30(5)
1.8 V / 3.3 V SEC_REFP
3.5
4.5
5.5
On-chip load capacitance
1.8 V SEC_REFN
5.5
7.25
8.5
pF
3.3 V SEC_REFN
6.5
7.34
8.5
Drive Level
See note (6)
200
µW
(1)
Verified with crystals specified for a load capacitance of CL=8pF, the pcb related capacitive load was estimated to be 2.3pF, and
completed with a load capacitors of 4pF on each crystal terminal connected to GND. XTALs tested: NX3225GA 10MHz EXS00A-
CG02813 CRG, NX3225GA 19.44MHz EXS00A-CG02810 CRG, NX3225GA 25MHz EXS00A-CG02811 CRG, and NX3225GA
30.72MHz EXS00A-CG02812 CRG.
(2)
For 30.73 MHz to 50 MHz, it is recommended to verify sufficient negative resistance and initial frequency accuracy with the crystal
vendor. The 50 MHz use case was verified with a NX3225GA 50MHz EXS00A-CG02814 CRG. To meet a minimum frequency error, the
best choice of the XTAL was one with CL = 7pF instead of CL = 8pF.
(3)
With NX3225GA_10M the measured remaining negative resistance on the EVM is 6430
Ω (43 x margin)
(4)
With NX3225GA_25M the measured remaining negative resistance on the EVM is 1740
Ω (25 x margin)
(5)
With NX3225GA_50M the measured remaining negative resistance on the EVM is 350
Ω (11 x margin)
(6)
Maximum drive level measured was 145 µW; XTAL should at least tolerate 200 µW
SINGLE ENDED OUTPUT CHARACTERISTICS (STATUS1, STATUS0, SDO, SDA)
VDD_Yx_Yy, VDD_PRI, VDD_SEC, VDD_PLLx, DVDD, VDD_VCO = 1.71 V TO 1.89 V, 2.375 V TO 2.625 V, 3.135 V TO
3.465 V; TA = -40 °C TO 85 °C (Output load capacitance 10 pF unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
Status 1, Status 0, and SDO only;
SDA is open drain and relies on
0.8 x
VOH
Output High Voltage
V
external pullup for high output; IOH =
DVDD
1 mA
0.2 x
VOL
Output Low Voltage
IOL = 1 mA
V
DVDD
Vslew
Output slew rate
30% - 70%
0.5
V/ns
IOZH
3-stat Output High Current
DVDD = 3.465 V, VIH = 3.465 V
5
µA
IOZL
3-stat Output Low Current
DVDD = 3.465 V, VIL = 0 V
-5
µA
Status Loss of Signal Detection
tLOS
LOS_REFfvco
1
2
1/f PFD
Time
Detect lock
2304
tLOCK
Status PLL Lock Detection Time
1/f PFD
Detect unlock
512
Copyright © 2012, Texas Instruments Incorporated
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