M902-01 Просмотр технического описания (PDF) - Integrated Circuit Systems
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M902-01 Datasheet PDF : 8 Pages
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Integrated
Circuit
Systems, Inc.
DETAILED BLOCK DIAGRAM
M902-01
VCSO BASED GBE CLOCK GENERATOR
Product Data Sheet
M902-01
RLOOP CLOOP
RLOOP CLOOP
RPOST
RPOST
CPOST
CPOST
OP_IN nOP_IN OP_OUT nOP_OUT nVC VC
External
Loop Filter
Components
XTAL_1 / REF_IN
XTAL_2
EXT_CLK
EN_EXT_CLK
Phase
Detector
RIN
XTAL
OSC
R Divider
R=4
RIN
Loop Filter
Amplifier
M Divider
M = 25
SAW Delay Line
Phase
Shifter
VCSO
O
Phase Locked Loop (PLL) 1
FOUT1
nFOUT1
FOUT0
nFOUT0
STOP
PIN DESCRIPTIONS
Figure 3: Detailed Block Diagram
Number
Name
1, 2, 3, 10, 14, 26 GND
I/O
Ground
Configuration
Description
Power supply ground connections.
4
OP_IN
9
nOP_IN
Input
5
8
nOP_OUT
OP_OUT
Output
6
nVC
7
VC
Input
External loop filter connections. See Figure 5,
External Loop Filter, on pg. 4.
11, 19, 33
VCC
Power
Power supply connection, connect to +3.3V.
12
13
15
16
17, 18
20, 21, 22
FOUT0
nFOUT0
FOUT1
nFOUT1
NC
Output No internal terminator
Clock output pairs, differential LVPECL output
(156.25 MHz for the M902-01-156.2500)
No internal connection
29, 30, 31, 32
23
EN_EXT_CLK
Input
Internal pull-down resistor1
Logic 1 enables the EXT_CLK input.
Use Logic 0 for normal operation.
24
EXT_CLK
Input
External clock feed-through: 0 to 200 MHz
25
STOP
Input
Internal pull-down resistor1
Logic 1 stops clock outputs.
Use Logic 0 for normal operation.
27
XTAL_1 / REF_IN
Input
External crystal connection. Also accepts
LVCMOS/LVTTL compatible clock source.
28
XTAL_2
Input
External crystal connection. Leave unconnected
when driving pin 27 with external clock reference.
34, 35, 36
DNC
Do Not Connect.
Note 1: For typical value of internal pull-down resistor, see DC Characteristics, Pull-down on pg. 6.
Table 2: Pin Descriptions
M902-01 Datasheet Rev 2.1
2 of 8
Revised 24Jun2004
Integrated Circuit Systems, Inc. ● Networking & Communications ● www.icst.com ● tel (508) 852-5400
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