Configuration
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Table 1. Jumper and Header Overview
(1)
(continued)
Jumper
Function
Jumper
Desription
Position
J6
CLK_REQ1
Open
CLK_REQ1 can be controlled externally via CON9
1-2
CLK_REQ1 = GND
2-3
CLK_REQ1 = High. Level is determined by J5
J7
Connects Buffer to
Open
No buffer connected to measure TCXO Clock
TCXO OUT
1-2
Buffer LMH6559MA (U2) is connected to measure TCXO Clock. Buffer can
drive 50 Ohm.
J8
CLK_REQ2
Open
CLK_REQ2 can be controlled externally via CON11
1-2
CLK_REQ2 = GND
2-3
CLK_REQ2 = High. Level is determined by J5
J9
TCXO Supply
1-2
TCXO is supplied by V
OUT
J10
CLK_REQ3
Open
CLK_REQ3 can be controlled externally via CON13
1-2
CLK_REQ3 = GND
2-3
CLK_REQ3 = High. Level is determined by J5
J11
SCLK_REQ Pull Up /
Open
No Pull-up or Pull-down connected to SCLK_REQ
Pull Down
1-2
100 k
Ω
Pull-down resistor connected from SCLK_REQ to GND
2-3
100 k
Ω
Pull-up resistor connected from SCLK_REQ to V
BAT
J12
CLK_REQ4
Open
CLK_REQ4 can be controlled externally via CON14
1-2
CLK_REQ4 = GND
2-3
CLK_REQ4 = High. Level is determined by J5
J13
SCLK_IN Source
1-2
SCLK_IN is connected to External Source, either through CON10 (AC-
Coupled) or CON12 (DC-Coupled)
3-4
SCLK_IN is connected to on-board TCXO
J14
CLK3 Capacitive load
1-2
Connects 10 pF from CLK3 to GND
3-4
Connects 22 pF from CLK3 to GND
5-6
Connects 33 pF from CLK3 to GND
7-8
Connects 47 pF from CLK3 to GND
J15
CLK4 Capacitive load
1-2
Connects 10 pF from CLK4 to GND
3-4
Connects 22 pF from CLK4 to GND
5-6
Connects 33 pF from CLK4 to GND
7-8
Connects 47 pF from CLK4 to GND
J16
Connects Buffer to
Open
No buffer connected to CLK1/2
CLK1/2
1-2
Buffer LMH6559MA (U3) is connected to measure CLK2. Buffer can drive
50 Ohm.
2-3
Buffer LMH6559MA (U3) is connected to measure CLK1. Buffer can
drive 50 Ohm.
J17
Connects Buffer to
Open
No buffer connected to measure TCXO Clock
CLK3/4
1-2
Buffer LMH6559MA (U4) is connected to measure CLK4. Buffer can drive
50 Ohm.
2-3
Buffer LMH6559MA (U4) is connected to measure CLK3. Buffer can drive
50 Ohm.
J18
TCXO Supply Header
Header can be used to provide an (external) TCXO supply instead of the
on-board V
OUT
supply. Header J9 should be open in this case.
J19
I
2
C Pull-up Resistors
Open
No Pull-up resistor connected to SDA and SCL line. Elsewhere should be
pull-up resistors present on SDA and SCL
1-2
Pull-up resistors connected on SDA and SCL
J20
SCLK_REQ Header
Header to monitor SCLK_REQ.
J21
Future purpose
Not Assembled
4
AN-1966 LMH2190 Evaluation Board
SNAA068B – July 2009 – Revised May 2013
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