LMX1600SLB National Semiconductor, LMX1600SLB Datasheet - Page 12

• Manufacturer Part Number: LMX1600SLB
• Description: PLLatinum Low Cost Dual Frequency Synthesizer
• Manufacturer: National Semiconductor

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2.0 Programming Description
2.5.3 OSC Mode Programming
The OSC
TCXO). If the application uses an external reference frequency source, the current dissipation of the LMX1600/01/02 can be re-
duced with the Logic Mode (0.5 mA typ.). Crystal Mode should be used when an external crystal resonator is used. Logic Mode
is used when an external reference frequency source is used. In Logic Mode, OSC
to ground for optimum performance.
When the FoLD output state is selected to CMOS high/low levels, the OSC Mode is forced to Crystal Mode.
2.5.4 Typical Crystal Oscillator Circuit
A typical implementation of a 10 MHz crystal oscillator with the OSC
2.6 SERIAL DATA INPUT TIMING
Note 17: Data shifted into register on clock rising edge.
TEST CONDITIONS: The Serial Data Input Timing is tested using a symmetrical waveform around V
an edge rate of 0.6 V/ns with amplitudes of 2.2V
AUX_R[17]
Data is shifted in MSB first.
out
3
0
0
pin can be optimized for operating with an external crystal resonator or an external reference frequency source (i.e.
All Other States
AUX_R[16]
2
0
0
FoLD
@
AUX_R[15]
V
(Continued)
CC
= 2.7V.
1
0
0
12
OUT
DS100129-18
pin in Crystal Mode is shown below.
AUX_R[14]
0
0
1
0
1
OUT
should be connected to a 30 pF capacitor
Crystal Mode
Crystal Mode
Crystal Mode
Logic Mode
CC
OSC
/2. The test waveform has
OUT
DS100129-19