LMX2377UTM National Semiconductor, LMX2377UTM Datasheet - Page 36

• Manufacturer Part Number: LMX2377UTM
• Description: IC FREQ SYNTH DUAL 20TSSOP
• Manufacturer: National Semiconductor
• Series: PLLatinum™r
• Type: PLL Frequency Synthesizerr

Specifications of LMX2377UTM

• Pll: Yes with Bypass
• Input: CMOS, TTL
• Output: CMOS
• Number Of Circuits: 1
• Ratio - Input:output: 3:1
• Differential - Input:output: Yes/No
• Frequency - Max: 2.5GHz, 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: 2.5GHz
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: *LMX2377UTM

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Reg. Most Significant Bit
Aux
R
2.0 Programming Description
2.4 AUXILIARY R REGISTER
The Aux R register contains the Aux R_CNTR, PD_POL Aux, ID
bits that compose the F
discussed in the following sections.
2.4.1 Aux R_CNTR[14:0] AUXILIARY SYNTHESIZER PROGRAMMABLE REFERENCE DIVIDER (R COUNTER)
Aux R[2:16]
The Aux reference divider (Aux R_CNTR) can be programmed to support divide ratios from 2 to 32767. Divide ratios less than
2 are prohibited.
2.4.2 PD_POL Aux
The PD_POL Aux bit is used to control the Aux synthesizer’s phase detector polarity based on the VCO tuning characteristics.
2.4.3 ID
The ID
Divide Ratio
F o LD0 F o LD2
PD_POL Aux
21
Control Bit
Control Bit
32767
ID
o
o
2
3
•
Aux bit controls the Aux synthesizer’s charge pump gain. Two current levels are available.
o
Aux
20
Aux
STATE
TRI-
Aux
ID o
19
Aux
18
ID o
14
0
0
1
•
o
LD control word. The detailed description and programming information for each control word is
PD_
POL
Aux
Register Location
AUXILIARY SYNTHESIZER CHARGE PUMP CURRENT GAIN
Register Location
17
AUXILIARY SYNTHESIZER PHASE DETECTOR POLARITY
13
0
0
1
•
Aux R[17]
Aux R[18]
16
12
0
0
1
•
15
14
11
0
0
1
•
Aux VCO Characteristics
13
SHIFT REGISTER BIT LOCATION
(Continued)
10
Aux Phase Detector
Polarity
Aux Charge Pump
Current Gain
0
0
1
•
Data Field
12
Description
Description
9
0
0
1
•
11
36
o
Aux R_CNTR[14:0]
Aux R_CNTR[14:0]
Aux, and TRI-STATE ID
8
0
0
1
•
10
9
7
0
0
1
•
Aux VCO Negative
Tuning
Characteristics
8
20022609
6
0
0
1
•
0.95 mA
7
LOW
o
5
0
0
1
•
0
0
Aux control words, in addition to two
6
4
0
0
1
•
5
Function
Function
4
3
0
0
1
•
Aux VCO Positive
Tuning
Characteristics
Least Significant Bit
3
2
0
0
1
•
3.80 mA
Aux R[18]
Aux R[17]
HIGH
2
1
1
1
1
1
1
•
Address
1
0
Field
0
0
1
1
•
0
0