PE3236EK PEREGRINE [Peregrine Semiconductor Corp.], PE3236EK Datasheet - Page 11

• Manufacturer Part Number: PE3236EK
• Description: 2200 MHz UltraCMOS-TM Integer-N PLL for Low Phase Noise Applications
• Manufacturer: PEREGRINE [Peregrine Semiconductor Corp.]

PE3236
Product Specification
Enhancement Register
The functions of the enhancement register bits are shown below with all bits active “high”.
Table 9. Enhancement Register Bit Functionality
Phase Detector
The phase detector is triggered by rising edges
from the main Counter (f
counter (f
and PD_D. If the divided VCO leads the divided
reference in phase or frequency (f
PD_D pulses “low”. If the divided reference leads
the divided VCO in phase or frequency (f
f
is directly proportional to phase offset between the
two input signals, f
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 and PD_D
results in a decrease in VCO frequency.
Document No. 70-0026-03 │ www.psemi.com
p
** Program to 0
), PD_U pulses “low”. The width of either pulse
Bit 0
Bit 1
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
Bit 7
Bit Function
Prescaler output
MSEL output
Counter load
Power down
c
Reserved**
Reserved**
Reserved**
). It has two outputs, namely PD_U,
f
p
, f
c
OE
p
and f
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
p
, f
p
c
c
) and the reference
.
outputs disabled.
p
leads f
c
c
leads
),
Description
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 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.
©2003-2005 Peregrine Semiconductor Corp. All rights reserved.
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