參數(shù)資料
型號(hào)： LUCW3000CCN
英文描述： W3000 PLL Dual-Band Frequency Synthesizer
中文描述： W3000鎖相環(huán)雙頻段頻率合成器
文件頁(yè)數(shù)： 14/28頁(yè)
文件大小： 327K
代理商： LUCW3000CCN
Advance Data Sheet
December 1999
W3000 PLL Dual-Band Frequency Synthesizer
Lucent Technologies Inc.
14
REF Register
(continued)
Table 15. ERES: External Resistor Setting for Charge Pump Current (Bit 21)
ERES
0
1
External Resistor Status
Use internal charge pump current setting (not tested in production)
Use external resistor to set charge pump current (recommended)
If bit 21 is set to 0, the W3000 uses its internal current source to set the charge pump currents, with the values
shown in Table 12. If bit 21 is set to 1, the charge pump current is set by an external resistor between pin 9
(RES) and V
DDC
. In this case, the charge pump current is given by the following formula:
REF
R
A
μ
DDC
SET
I
CP
100
05
.
V
*
I
=
where
I
CP
= Nominal charge pump current.
I
SET
= Current setting as in Table 12.
RREF = Value of external current reference resistor. See Table 3 for appropriate value.
A tight-tolerance R
REF
resistor is recommended.
Table 16. EN1: Synthesizer Enable (Bit 22)
PWRDN
(Input Pin 11)
High
High
Low
Low
EN1
Mode
0
1
0
1
Powerdown
Enable
Powerdown
Powerdown
The MAIN register also contains an enable bit, EN2. The W3000 is enabled and powered down with either the
REF or the MAIN register, whichever was programmed more recently. The contents of the MAIN and REF
registers are maintained in powerdown mode, providing supply voltages are maintained.
Table 17. LD: Lock Detect Enable (Bit 23)
LD (Bit 23)
0
0
1
1
Mode
Disabled
Disabled
Enabled
Enabled
PLL Condition
Locked
Unlocked
Locked
Unlocked
Output Level on Pin 8 LockDet
High
High
High
Low
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