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CDCE62005 데이터시트(PDF) 4 Page - Texas Instruments

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부품명 CDCE62005
상세설명  Five/Ten Output Clock Generator/Jitter Cleaner With Integrated Dual VCOs
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제조업체  TI [Texas Instruments]
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CDCE62005
SCAS862 – NOVEMBER 2008........................................................................................................................................................................................... www.ti.com
PIN FUNCTIONS (continued)
PIN
TYPE
DESCRIPTION
NAME
QFN
REF_SEL
31
I
If Auto Reference Select Mode is OFF this Pin acts as External Input Reference Select Pin;
The REF_SEL signal selects one of the two input clocks:
REF_SEL [1]: PRI_IN is selected; REF_SEL [0]: SEC_IN is selected;
The input has an internal 150-k
Ω pull-up resistor if left unconnected it will default to logic level “1”.
If Auto Reference Select Mode in ON this Pin not used.
Power_Down
12
I
Active Low. Power down mode can be activated via this pin. See Table 14 for more details. The
input has an internal 150-k
Ω pull-up resistor if left unconnected it will default to logic level “1”.
SPI_LE has to be HIGH in order for the rising edge of Power_Down signal to load the EEPROM.
SYNC
14
I
Active Low. Sync mode can be activated via this pin. See Table 14 for more details. The input has
an internal 150-k
Ω, pull-up resistor if left unconnected it will default to logic level “1”.
AUX IN
43
I
Auxiliary Input is a single ended input including an on-board oscillator circuit so that a crystal may
be connected.
AUX OUT
13
O
Auxiliary Output LVCMOS level that can be programmed via SPI interface to be driven by Output 2
or Output 3.
PRI REF+
45
I
Universal Input Buffer (LVPECL, LVDS, LVCMOS) positive input for the Primary Reference Clock,
PRI REF–
46
I
Universal Input Buffer (LVPECL, LVDS) negative input for the Primary Reference Clock. In case of
LVCMOS signaling Ground this pin.
SEC REF+
3
I
Universal Input Buffer (LVPECL, LVDS, LVCMOS) positive input for the Secondary Reference
Clock,
SEC REF–
2
I
Universal Input Buffer (LVPECL, LVDS,) negative input for the Secondary Reference Clock. In
case of LVCMOS signaling Ground this pin.
TESTOUTA
30
Analog
Analog Test Point for Use for TI Internal Testing. Pull Down to GND Via a 1k
Ωs Resistor.
REG_CAP1
4
Analog
Capacitor for the internal Regulator. Connect to a 10uF Capacitor (Y5V)
REG_CAP2
38
Analog
Capacitor for the internal Regulator. Connect to a 10uF Capacitor (Y5V)
VBB
48
Analog
Capacitor for the internal termination Voltage. Connect to a 1uF Capacitor (Y5V)
EXT_LFP
40
Analog
External Loop Filter Input Positive
EXT_LFN
41
Analog
External Loop Filter Input Negative.
PLL_LOCK
37
AI/O
Output that indicates PLL Lock Status. See Figure 36.
U0P:U0N
27, 28
O
The Main outputs of CDCE62005 are user definable and can be any combination of up to 5
LVPECL outputs, 5 LVDS outputs or up to 10 LVCMOS outputs. The outputs are selectable via
U1P:U1N:
19, 20
SPI interface. The power-up setting is EEPROM configurable.
U2P:U2N
16,17
U3P:U3N
9, 10
U4P:U4N
6, 7
4
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