jitter, while covering a wide frequency output range
up to 800MHz, without the use of external
components. The high performance and high
frequency output is achieved using a low cost
fundamental crystal of between 19MHz and 44 MHz.
The PL585 is designed to address the demanding
requirements of high performance applications such
Fiber Channel, serial ATA, Ethernet, SAN,
SONET/SDH, etc.
OUTPUT ENABLE CONTROL
OE Options
(Programmable)
Conventional
Polarity
Reverse
Polarity
OE
0 (Default)
1
0
1 (Default)
State
Output enabled
Tri-state
Tri-state
Output enabled
BLOCK DIAGRAM
OE/PDB
XIN/REF
XOUT
Q
Pre-scalar
/2
VCON
Varicap
M Divider
Programmable Function
P Divider
/2
QB
Xtal
Osc
PD/CP
LF – HF
LCVCOs
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1(408) 944 -0800 • fax +1(408) 474-1000 •
www.micrel.com
Rev 11/18/11 Page 1
(Preliminary)
PL585-XX
19MHz to 800MHz Low Phase-Noise VCXO
PIN ASSIGNMENT
Name
XIN
VCON
DNC
OE/PDB
GND_ANA
GND_DIG
GND_BUF
Q
QB
VDD_BUF
VDD_DIG
VDD_ANA
XOUT
Pin #
1
2
3, 5, 9
4
6
7
8
10
12
11, 13
14
15
16
Type
I
I
-
I
P
P
P
O
O
P
P
P
P
Crystal input connection.
Analog voltage control pin.
Do Not Connect.
This pin may be programmed as output enable (OE), or power -down
(PDB) pin. This pin incorporates an Internal pull -up resistor of 60KΩ for
OE, and PDB, operations.
GND connection for analog circuitry.
GND connection for digital circuitry.
GND connection for buffer circuitry.
True Output buffer.
Complementary Output buffer.
VDD connection for buffer circuitry.
VDD connection for digital circuitry.
VDD connection for analog circuitry.
Output connection to crystal .
Description
OPTION SELECTION TABLE
PL585 is a fully programmable VCXO IC. However, for ordering convenience, the following part numbers have
been created for when simple multiplication is used, for your convenienc e. When other features of the IC are
exercised (i.e. reverse polarity on OE, power down, etc.), a nother 3-digit code is used to identify the functionality.
Input Crystal
Frequency Range (MHz)
33.750000 ~ 40.000000
33.333333 ~ 42.187500
32.142857 ~ 38.095238
33.333333 ~ 37.500000
33.750000 ~ 40.000000
33.333333 ~ 42.187500
32.142857 ~ 38.095238
33.333333 ~ 37.500000
33.750000 ~ 40.000000
33.333333 ~ 42.187500
32.142857 ~ 38.095238
33.333333 ~ 37.500000
33.750000 ~ 40.000000
32.812500 ~ 42.187500
Multiplication
Factor
X20
X16
X14
X12
X10
X8
X7
X6
X5
X4
X3.5
X3
X2.5
X2
Output Frequency Range (MHz)
Low Limit
High Limit
675.00
800.00
533.33
675.00
450.00
533.33
400.00
450.00
337.50
400.00
266.67
337.50
225.00
266.67
200.00
225.00
168.75
200.00
133.33
168.75
112.50
133.33
100.00
112.50
84.375
100.00
65.625
84.375
Part #
PL585-P8-020
PL585-P8-168
PL585-P8-148
PL585-P8-128
PL585-P8-108
PL585-P8-088
PL585-P8-078
PL585-P8-068
PL585-P8-058
PL585-P8-048
PL585-P8-358
PL585-P8-038
PL585-P8-258
PL585-P8-028
Common functionality for packaged parts in the above table: OE function active high polarity. Please inform your
Sales representative for active low OE functionality.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1(408) 944 -0800 • fax +1(408) 474-1000 •
www.micrel.com
Rev 11/18/11 Page 2
(Preliminary)
PL585-XX
State
Output enabled
Tri-state
Tri-state
Output enabled
19MHz to 800MHz Low Phase-Noise VCXO
FUNCTIONAL DESCRIPTION
PL585 family of products is an advanced,
programmable LCVCO VCXO IC that is designed to
meet the most stringent performance specifications
for phase noise, jitter, and power consumption.
There are two main types of VCOs, a) Ring
Oscillator, b) LC Tank oscillator. An LCVCO is made
up of LC tank oscillator. Although a Ring Oscillator
has very good performance, and has a good tuning
range, its phase noise and jitter performance , in
particular at higher frequencies, degrades.
On the other hand, an LCVCO has an outstanding
phase noise and jitter performance, even at higher
frequencies. PL585 family of products takes
advantage of this state of the art technology, and
incorporates the LC tank on-chip, for optimal
performance.
PL585 family of products exhibit very low phase
noise/phase jitter and peak to peak jitter, wide tuning
range, and very low-power. All members of the
PL585 family accept a low-cost fundamental crystal
input of 19MHz to 44MHz, and its flexible core is
capable of producing any output frequency between
19MHz to 800MHz.
PLL Programming
The PLL in the PL585 family is fully programmable.
Micrel programming software is used to configure and
program the IC.
OE (Output Enable)
The OE pin in PL585 family, through programming,
can be configured to support OE pin activation with a
logic ‘1’ or logic ’0’, to provide you with the desired
enable polarity.
OE Options
(Programmable)
Conventional
Polarity
Reverse
Polarity
OE
0 (Default)
1
0
1 (Default)
In addition, The OE feature can be programmed to
allow the output to float (Hi Z), or to operate in the
‘Active low’ mode, for CMOS outputs. The
programming control for the OE options is shown
below:
OE Pin
0
1
Osc
On
PLL
On
Output
Hi Z
Active ‘0’
On
On
(CMOS Only)
Normal Operation (Default)
Note: Typical enable time is <50ns plus one clock period.
The OE pin incorporates a 60K
Ω
resistor to either
pull-up or pull-down to the default state when the OE
pin is left open.
Power-Down Control (PDB)
When activated, this programmable feature ‘Disables
the VCO, the oscillator circuitry, counters, and all
other active circuitry. PDB activation disables all
outputs and the IC consumes <15µA of power, in the
power down mode, to conserve power. The PDB
input incorporates a 10MΩ pull up resistor for
normal operating condition.
The PDB feature can be programmed to allow the
output to float (Hi Z), or to operate in the ‘Active low’
mode, in CMOS output. The logic for PDB is shown
below:
PDB Pin
0
1
Osc.
Off
PLL
Off
Output
Hi Z
Active ‘0’
Off
Off
(CMOS Only)
Normal Operation (Default)
Note: Typical enable time is <10ms.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1(408) 944 -0800 • fax +1(408) 474-1000 •
www.micrel.com
Rev 11/18/11 Page 3
(Preliminary)
PL585-XX
19 MHz to 800MHz Low Phase-Noise VCXO
ELECTRICAL SPECIFICATIONS
1. ABSOLUTE MAXIMUM RATINGS
PARAMETERS
Supply Voltage
Input Voltage, dc
Output Voltage
Storage Temperature
Ambient Operating Temperature (industrial temperature)*
Ambient Operating Temperature (commercial temperature)
Junction Temperature
ESD Protection, Human Body Model
SYMBOL
V
DD
V
I
V
O
T
S
T
AI
T
AC
T
J
2
-0.5
-0.5
-65
-40
0
MIN
MAX
4.6
V
DD
+0.5
V
DD
+0.5
150
85
70
125
UNITS
V
V
V
C
C
C
C
kV
Exposure of the device under conditions beyond the limits specified by Maximum Ratings for extended periods may cause permane nt damage to the
device and affect product reliability. These conditions represent a stress rating only, and functional operations of the device at these or any other
conditions above the operational limits noted in this specification is not implied. *Operating temperature is guaranteed by design. Parts are tested to
commercial grade only.
2. GENERAL ELECTRICAL SPECIFICATIONS
PARAMETERS
Supply Current, Dynamic
Supply Current, PDB
Enabled
Output Enable Time
Power Up Time
Operating Voltage
Power Up Ramp Rate
Auto-Calibration Time
Output Clock Duty Cycle
t
OE
T
PU
V
DD
t
PU
t
AC
Time for V
DD
to reach 90% V
DD
.
Power ramp must be monotonic.
At power up
@ 50% of output waveform
45
50
SYMBOL
I
DDQ
CONDITIONS
LVPECL, 622.08MHz, 3.3V
PDB = 0, 3.3V
OE logic 0 to logic 1, Ta=25º C.
Add one clock period to this
measurement for a usable clock
output.
PDB logic 0 to logic 1, Ta=25º C.
2.97
0.1
3.3
MIN
TYP
MAX
90
10
50
10
3.63
100
10
55
UNITS
mA
uA
ns
ms
V
ms
ms
%
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1(408) 944 -0800 • fax +1(408) 474-1000 •
www.micrel.com
Rev 11/18/11 Page 4
(Preliminary)
3. VOLTAGE CONTROLLED CRYSTAL OSCILLATOR
PARAMETERS
VCXO Pullability
VCXO Tuning Characteristic
Pull Range Linearity
VCON Pin Input Impedance
VCON Modulation BW
0V
VCON
3.3V, -3dB
10
18
SYMBOL
CONDITIONS
VCON=1.65V,
1.65V
XTAL C
1
>10fF and C
0
/C
1
<250
MIN
PL585-XX
TYP
MAX
UNITS
ppm
ppm/V
10
%
MΩ
kHz
19 MHz to 800MHz Low Phase-Noise VCXO
150
100
4. CRYSTAL SPECIFICATIONS
PARAMETERS
Crystal Resonator Frequency
Crystal Cload
Shunt Capacitance
Crystal Pullability
Recommended ESR
SYMBOL
F
XIN
C
L_ Crys ta l
C
0_ Crys ta l
C
0
/C
1
R
E
AT cut
AT cut , up to 40MHz
AT cut , up to 44MHz
250
45
40
CONDITIONS
Parallel Fundamental Mode
V
DD
= 3.3V, VCON = 1.65V
MIN
19
8.5
3.5
pF
--
Ω
Ω
TYP
MAX
44
UNITS
MHz
5. JITTER SPECIFICATIONS
PARAMETERS
RMS Phase Jitter
Period Jitter, Pk-to-Pk
212.5MHz
FREQUENCY
622.08MHz
622.08MHz
CONDITIONS
12kHz to 20MHz, XIN=38.88MHz
10K cycles, LVPECL (-88)
XIN=38.88MHz
10K cycles, LVCMOS (-27),
XIN=26.5625MHz
MIN
TYP
0.5
25
ps
35
MAX
UNITS
ps
6. PHASE NOISE SPECIFICATIONS
Freq.
@
PARAMETERS
(MHz)
10Hz
Phase Noise, relative
to carrier (typical)
155.52
622.08
-56
-47
@
100Hz
-86
-77
@
1KHz
-112
-101
@
@
10KHz 100KHz
-123
-111
-127
-114
@
1MHz
136
-127
@
10MHz
147
-145
UNITS
dBc/Hz
Note: Phase Noise measured at VCON = 1.65V
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1(408) 944 -0800 • fax +1(408) 474-1000 •
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