LMX2301TM National Semiconductor, LMX2301TM Datasheet - Page 7

• Manufacturer Part Number: LMX2301TM
• Description: IC FREQ SYNTHESIZER 20-TSSOP
• Manufacturer: National Semiconductor
• Series: PLLatinum™r
• Type: PLL Frequency Synthesizerr

Specifications of LMX2301TM

• Pll: Yes
• Input: Clock
• Output: CMOS
• Number Of Circuits: 1
• Ratio - Input:output: 2:1
• Differential - Input:output: Yes/No
• Frequency - Max: 160MHz
• 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: 160MHz
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: *LMX2301TM

Functional Description
PROGRAMMABLE DIVIDER (N COUNTER)
The N counter consists of the 11-bit programmable counter If the Control Bit (last bit shifted into the Data Register) is LOW
data is transferred from the 19-bit shift register into an 11-bit latch which sets the 11-bit programmable Counter Serial data
format is shown below
Note R8 to R18 Programmable counter divide ratio control bits (3 to 2047)
7 LSB BITS OF N REGISTER
Note X
11-BIT PROGRAMMABLE COUNTER DIVIDE RATIO
Note Divide ratio 3 to 2047 (Divide ratios less than 3 are prohibited)
Divide
Divide
Ratio
Ratio
2047
N
3
4
X
e
Don’t care state
18
N
X
N
7
0
0
1
N
6
X
17
N
0
0
1
N
5
X
16
N
0
0
1
N
4
X
15
N
0
0
1
N
X
3
14
N
0
0
1
N
X
2
13
N
0
0
1
N
X
1
12
(Continued)
N
0
0
1
11
N
0
0
1
10
N
0
1
1
N
9
1
0
1
N
8
1
0
1
7
EQUATION FOR OUTPUT FREQUENCY
DETERMINATION
f
f
N
f
R
VCO
VCO
OSC
e
Output frequency of external voltage controlled oscil-
lator (VCO)
Preset divide ratio of binary 11-bit programmable
counter (3 to 2047)
Output frequency of the external reference frequency
oscillator
Preset divide ratio of binary 14-bit programmable ref-
erence counter (3 to 16383)
N
c
f
OSC
R
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