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參數(shù)資料
| 型號： | LMX2372MDC |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 1200 MHz, UUC |
| 封裝： | DIE |
| 文件頁數(shù)： | 9/27頁 |
| 文件大?。?/td> | 550K |
| 代理商： | LMX2372MDC |
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2.0 Programming Description (Continued)
2.3.7 Power Down Mode Table
Main PLL
Auxiliary PLL
Main
Counters
Auxiliary
Counters
OSC
in Buffer
Active
ON
Active
Powered Down
ON
OFF
ON
Powered Down
Active
OFF
ON
Powered Down
OFF
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
R16
R15
Address[1:0]
f
OUT/Lock Detect
Charge
Pump
TRI-STATE
Charge
Pump
Magnitude
Phase
Detector
Polarity
FoLD 1
FoLD 0
Aux_CP
o_TRI
Aux_CP
o_4X
Aux_PD_POL
0 0
FoLD 3
FoLD 2
Main_CP
o_TRI
Main_CP
o_4X
Main_PD_POL
1 0
2.4.2 Mode Select Truth Table
CP
o_TRI (Note 7)
CP
o_4X (Note 8)
PD_POL (Note 9)
0
Normal Operation
1X Current
LOW
1
TRI-STATE
4X Current
HIGH
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: ICPo (charge pump current magnitude) is dependent on Vp. The ICPo LOW current state = 1/4 x ICPo 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
LMX2370/LMX2371/LMX2372
www.national.com
17
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| LMX2377U WAF | 制造商:Texas Instruments 功能描述: |
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