83336-0 Peregrine Semiconductor, 83336-0 Datasheet - Page 11

• Manufacturer Part Number: 83336-0
• Description: KIT EVAL FOR 83336 PLL INTEGER-N
• Manufacturer: Peregrine Semiconductor
• Series: -r

Specifications of 83336-0

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 83336-00

PE83336
Product Specification
Enhancement Register
The functions of the enhancement register bits are shown below with all bits active “high”.
Table 10. Enhancement Register Bit Functionality
Phase Detector
The phase detector is triggered by rising edges
from the main Counter (f
counter (f
If the divided VCO leads the divided reference in
phase or frequency (f
“low”. If the divided reference leads the divided
VCO in phase or frequency (f
pulses “low”. The width of either pulse is directly
proportional to phase offset between the two input
signals, f
The phase detector gain is equal to 2.7 V / 2 π,
which numerically yields 0.43 V / radian.
Document No. 70-0137-02 │ www.psemi.com
** Program to 0
Bit 0
Bit 1
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
Bit 7
Bit Function
Prescaler output
p
MSEL output
Counter load
Power down
c
Reserved**
Reserved**
Reserved**
). It has two outputs, PD_U, and PD_D.
and f
f
p
, f
c
OE
c
.
p
Power down of all functions except programming interface.
Immediate and continuous load of counter programming as directed by the Bmode and
Smode inputs.
Drives the internal dual modulus prescaler modulus select (MSEL) onto the Dout output.
Drives the raw internal prescaler output onto the Dout output.
f
leads f
p
, f
p
c
) and the reference
outputs disabled.
c
c
), PD_D pulses
leads f
p
), PD_U
Description
PD_U and PD_D drive an active loop filter which
controls the VCO tune voltage. PD_U pulses
result in an increase in VCO frequency; PD_D
pulses result in a decrease in VCO frequency (for
a positive Kv VCO).
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
2 kΩ resistor. Connecting Cext to an external
shunt capacitor provides low pass filtering of this
signal. 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.
©2003-2006 Peregrine Semiconductor Corp. All rights reserved.
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