參數(shù)資料
型號(hào): LMX2370
廠商: National Semiconductor Corporation
英文描述: PLLatinum Dual Frequency Synthesizer for RF Personal Communications(PLLatinum技術(shù)用于射頻個(gè)人通訊的雙通道頻率合成器)
中文描述: PLLatinum雙頻率合成射頻個(gè)人通信(PLLatinum技術(shù)用于射頻個(gè)人通訊的雙通道頻率合成器)
文件頁(yè)數(shù): 17/24頁(yè)
文件大?。?/td> 516K
代理商: LMX2370
2.0 Programming Description
(Continued)
2.3.7 Power Down Mode Table
Main PLL
Auxiliary PLL
Main
Counters
ON
ON
OFF
OFF
Auxiliary
Counters
ON
OFF
ON
OFF
OSC
in
Buffer
Active
Active
Active
ON
ON
ON
OFF
Powered Down
Active
Powered Down
Powered Down
Powered Down
2.4 PROGRAMMABLE MODES
Several modes of operation can be programmed with bits R15–R19 including the phase detector polarity, charge pump magni-
tude, charge pump TRI-STATE and the output of the Fo/LD pin. The programmable modes are shown in Table 1. Truth table for
the programmable modes and Fo/LD output are shown in Table 2 and Table 3.
2.4.1 Programmable Modes Table
R19
R18
R17
Charge
Pump
TRI-STATE
Aux_CP
o
_TRI
Main_CP
o
_TRI
R16
Charge
Pump
Magnitude
Aux_CP
o
_4X
Main_CP
o
_4X
R15
Phase
Detector
Polarity
Aux_PD_POL
Main_PD_POL
Address[1:0]
f
OUT
/Lock Detect
FoLD 1
FoLD 3
FoLD 0
FoLD 2
0 0
1 0
2.4.2 Mode Select Truth Table
CP
o
_TRI
(Note 7)
Normal Operation
TRI-STATE
CP
o
_4X
(Note 8)
1X Current
4X Current
PD_POL
(Note 9)
LOW
HIGH
0
1
Note 7:
Both synchronous and asynchronous power down modes are available with the LMX237x family to be able to adapt to different types of applications. The
MICROWIRE control register remains active and capable of loading and latching in data during all of the powerdown modes.
Note 8:
ICP
o
(charge pump current magnitude) is dependent on Vp. The ICP
o
LOW current state = 1/4 x ICP
o
HIGH current.
Note 9:
See Section 2.4.3
2.4.3 Phase Detector Polarity (Aux_PD_POL, Main_PD_POL)
Depending upon VCO characteristics, the Aux_PD_POL
(Aux_R15) and Main_PD_POL (Main_R15) bits should be
set accordingly:
When VCO characteristics are positive like (1), R15 should
be set HIGH;
When VCO characteristics are negative like (2), R15 should
be set LOW.
VCO CHARACTERISTICS
DS101026-5
L
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相關(guān)PDF資料
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LMX2371 PLLatinum Dual Frequency Synthesizer for RF Personal Communications(PLLatinum技術(shù)用于射頻個(gè)人通訊的雙通道頻率合成器)
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LMX2485_0610 50 MHz - 3.0 GHz High Performance Delta-Sigma Low Power Dual PLLatinum⑩ Frequency Synthesizers with 800 MHz Integer PLL
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