LMX2315TM National Semiconductor, LMX2315TM Datasheet - Page 12

• Manufacturer Part Number: LMX2315TM
• Description: IC FREQ SYNTHESIZER 20-TSSOP
• Manufacturer: National Semiconductor
• Series: PLLatinum™r
• Type: PLL Frequency Synthesizerr

Specifications of LMX2315TM

• Pll: Yes
• Input: CMOS, TTL
• Output: CMOS
• Number Of Circuits: 1
• Ratio - Input:output: 2:1
• Differential - Input:output: Yes/No
• Frequency - Max: 1.2GHz
• Divider/multiplier: Yes/No
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 20-TSSOP
• Frequency-max: 1.2GHz
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: *LMX2315TM

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Functional Description
SERIAL DATA INPUT TIMING
Notes:
Parenthesis data indicates programmable reference divider data.
Data shifted into register on clock rising edge.
Data is shifted in MSB first.
Test Conditions:
The Serial Data Input Timing is tested using a symmetrical waveform around V
V
Phase Characteristics
In normal operation, the FC pin is used to reverse the
polarity of the phase detector. Both the internal and any
external charge pump are affected.
Depending upon VCO characteristics, FC pin should be set
accordingly:
When FC is set HIGH or OPEN CIRCUIT, the monitor pin of
the phase comparator input, f
divider output, f
programmable divider output, f
PHASE COMPARATOR AND INTERNAL CHARGE PUMP CHARACTERISTICS
Notes:
Phase difference detection range: −2 to +2
The minimum width pump up and pump down current pulses occur at the D
FC = HIGH
CC
= 2.7V and 2.6V
When VCO characteristics are like (1), FC should be set
HIGH or OPEN CIRCUIT;
When VCO characteristics are like (2), FC should be set
LOW.
r
. When FC is set LOW, f
@
V
CC
= 5.5V.
p
out
.
, is set to the reference
(Continued)
out
is set to the
o
pin when the loop is locked.
CC
12
/2. The test waveform has an edge rate of 0.6 V/ns with amplitudes of 2.2V
VCO Characteristics
DS012339-23
DS012339-21
DS012339-22
@