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參數(shù)資料
| 型號： | 9702-01 |
| 廠商： | PEREGRINE SEMICONDUCTOR CORP |
| 元件分類： | PLL合成/DDS/VCOs |
| 英文描述： | 3.0 GHz Integer-N PLL for Rad Hard Applications |
| 中文描述： | PHASE LOCKED LOOP, CQCC44 |
| 封裝： | CERAMIC, QFJ-44 |
| 文件頁數(shù)： | 3/13頁 |
| 文件大?。?/td> | 262K |
| 代理商： | 9702-01 |
Product Specification
PE9702
Page 11 of 13
Document No. 70-0036-02
│ www.psemi.com
2003-2006 Peregrine Semiconductor Corp. All rights reserved.
PD_U pulses result in an increase in VCO
frequency and PD_D results in a decrease in VCO
frequency.
A lock detect output, LD is also provided, via the
pin Cext. Cext is the logical “NAND” of PD_U and
PD_D waveforms, which is driven through a series
2k ohm resistor. Connecting Cext to an external
shunt capacitor provides integration. Cext also
drives the input of an internal inverting comparator
with an open drain output. Thus LD is an “AND”
function of PD_U and PD_D. See Figure 4 for a
schematic of this circuit.
Enhancement Register
The functions of the enhancement register bits are shown below with all bits active “high”.
Table 9. Enhancement Register Bit Functionality
** Program to 0
Phase Detector
The phase detector is triggered by rising edges
from the main Counter (fp) and the reference
counter (fc). It has two outputs, namely PD_U,
and PD_D. If the divided VCO leads the divided
reference in phase or frequency (fp leads fc),
PD_D pulses “l(fā)ow”. If the divided reference leads
the divided VCO in phase or frequency (fr leads
fp), PD_U pulses “l(fā)ow”. The width of either pulse
is directly proportional to phase offset between the
two input signals, fp and fc. The phase detector
gain is 430 mV / radian.
PD_U and PD_D are designed to drive an active
loop filter which controls the VCO tune voltage.
Bit Function
Description
Bit 0
Reserved**
Bit 1
Reserved**
Bit 2
Reserved**
Bit 3
Power down
Power down of all functions except programming interface.
Bit 4
Counter load
Immediate and continuous load of counter programming as directed by the
Bmode and
Smode inputs.
Bit 5
MSEL output
Drives the internal dual modulus prescaler modulus select (MSEL) onto the Dout output.
Bit 6
Prescaler output
Drives the raw internal prescaler output (fmain) onto the Dout output.
Bit 7
fp, fc OE
fp, fc outputs disabled.
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