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參數(shù)資料
| 型號(hào)： | 9704-11 |
| 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 Apllications |
| 中文描述： | PHASE LOCKED LOOP, CQCC44 |
| 封裝： | CERAMIC, QFJ-44 |
| 文件頁(yè)數(shù)： | 9/10頁(yè) |
| 文件大?。?/td> | 247K |
| 代理商： | 9704-11 |
Product Specification
PE9704
Page 8 of 10
2003-2006 Peregrine Semiconductor Corp. All rights reserved.
Document No. 70-0083-03
│ UltraCMOS RFIC Solutions
Figure 4. Serial Interface Mode Timing Diagram
t
DHLD
t
DSU
t
ClkH
t
ClkL
t
CWR
t
PW
t
WRC
t
EC
t
CE
E_WR
DATA
CLOCK
S_WR
PD_U pulses result in an increase in VCO
frequency and
PD_D results in a decrease in VCO
frequency.
Software tools for designing the active loop filter
can be found at Peregrine’s web site:
www.psemi.com
Lock Detect Output
A lock detect signal is provided at pin LD, via the
pin CEXT (see Figure 1). CEXT is the logical “NAND”
of PD_
U and PD_D waveforms, driven through a
series 2 k
resistor. Connecting C
EXT to an
external shunt capacitor provides integration of
this signal.
Enhancement Register
The functions of the enhancement register bits are shown below. All bits are active high. Operation is
undefined if more than one output is sent to DOUT.
Table 9. Enhancement Register Bit Functionality
** Program to 0
Phase Detector Outputs
The phase detector is triggered by rising edges
from the main counter (fp) and the reference
counter (fc). It has two outputs, 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 (fc 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
fp output
Drives the M counter output onto the DOUT output.
Bit 3
Power down
Power down of all functions except programming interface.
Bit 4
Counter load
Immediate and continuous load of counter programming.
Bit 5
MSEL output
Drives the internal dual modulus prescaler modulus select (MSEL) onto the DOUT output.
Bit 6
fc output
Drives the R counter output onto the DOUT output
Bit 7
PB
Allows Fin to bypass the 10/11 prescaler
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