(Prelim inary )
Analog Frequency Multiplier
PL565-68 VCXO
FEATURES
Non-PLL frequency multiplication by 2.
Input frequency from 62.5-160 MHz
Output frequency
o
PL565-68: 125-320MHz
Low phase noise and jitter (equivalent to fundamental
crystal at the output frequency)
Ultra-low jitter
o
RMS phase jitter < 100 fs (12kHz-20MHz)
o
RMS random period jitter < 2 ps
Low phase noise
o
-142 dBc/Hz @100kHz offset from the carrier
o
-155 dBc/Hz @10MHz offset from the carrier
High linearity pull range (typ. 5%)
VCXO, set pullability ±100ppm ~ ±200ppm
Low input frequency eliminates the need for expensive
crystals
Differential output levels: LVPECL
Single 3.3V, ±10% power supply
Optional industrial temperature range (-40C to +85C)
Available in 16-pin
Green/RoHS
compliant
3x3 QFN
packages and as die.
PRODUCT DESCRIPTION
The Analog Frequency Multiplier (AFM) is the
industry’s first ‘Balanced Oscillator’ utilizing analog
multiplication of the fundamental frequency (at
quadruple frequency), combined with an attenuation
of the fundamental of the reference crystal, without
the use of a phase-locked loop (PLL), in CMOS
technology.
Micrel’s world’s best performing AFM products can
achieve up to 800 MHz output frequency with little
jitter or phase noise deterioration. In addition, the
low frequency input crystal requirement makes the
AFM the most affordable high-performance timing-
source in the market.
PL565-68 product utilizes low-power CMOS
technology and is housed in
Green
/
RoHS
compliant
16-pin TSSOP, and 16-pin 3x3 QFN
packages.
QFN PACKAGE PIN-OUT
GNDBUF
9
8
7
6
5
VDDBUF
QBAR
11
VDDANA
OESEL
VDDOSC
L2X
12
13
14
15
16
10
Q
GNDANA
DNC
OE
XOUT
P565-68
1
2
3
4
OSCOFF
SEL
GNDOSC
VCON
XIN
PL565-68 BLOCK DIAGRAM
VCON
L2X
OE
XIN
Oscillator
Amplifier
Frequency
X2
QBAR
Q
XOUT
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1(408) 9 44-0800 • fax +1(408) 474-1000 •
www.micrel.com
Rev 12/08/11 Page 1
(Prelim inary )
Analog Frequency Multiplier
PL565-68 VCXO
DIE SPECIFICATIONS
18
19
20
17
16
15
14
13
12
11
Chip size, active area
Chip thickness
PAD size
Scribe Line Dimension
Chip Base
SCRIBE LINE
1.414mm x 1.385mm
200µm ± 20µm
80µm x 80µm
X = 80µm
Y = 80µm
GND level
1.385mm
Y
0,0
X
10
9
8
21
22
Die ID
7
1
2
3
4
5
6
Die ID:
PL565-68DC
C561A BBBBBBB
SCRIBE LINE
PAD/PIN ASSIGNMENT AND DESCRIPTION
(The
X/Y coordinates indicate pad centers)
Name
GNDOSC
DNC
GNDANA
GNDSHD
GNDSHD
GNDBUF
GNDBUF
PECL
PECLB
VDDBUF
VDDBUF
VDDANA
DNC
OESEL
VDDOSC
L2X
OSCOFFSEL
GNDOSC
VCON
XIN
XOUT
OE
Pad Assignment*
Pad # X (µm) Y (µm)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
-352
-183
+15
+144
+292
+469
+502
+502
+502
+502
+571
+571
+377
+183
-57
-214
-410
-572
-572
-572
-572
-572
-557
-557
-557
-557
-557
-557
-365
-215
-54
+79
+236
+413
+554
+554
+554
+554
+554
+554
+394
+199
-309
-521
QFN
Pin #
-
7
8
9
10
11
12
13
-
14
15
16
1
2
3
4
5
6
Type
P
P
P
P
P
P
P
O
O
P
P
P
I
P
I
I
P
I
I
O
I
Description
GND connection
Do Not Connect
GND connection
GND connection
GND connection
GND connection
GND connection
LVPECL output
LVPECL complementary output
VDD connection
VDD connection
VDD connection
Do Not Connect
OE style selection pin
VDD connection
External inductor connection
Oscillator Off selection pin
GND connection
Control voltage input
Crystal Input pad
Crystal Output pad
Output Enable input
*
Note: Pad coordinates referenced to the center of the die.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1(408) 9 44-0800 • fax +1(408) 474-1000 •
www.micrel.com
Rev 12/08/11 Page 2
(Prelim inary )
Analog Frequency Multiplier
PL565-68 VCXO
AFM Phase Noise at 311.04MHz, using 155.52MHz crystal
AFM Spectrum at 311.04MHz, using 155.52MHz crystal
The analog frequency multiplication preserves the low phase noise of the quartz crystal oscillator while keeping
unwanted sub harmonics from the multiplication at very low levels. Sub harmonics appear only at large distance
from the carrier, far outside the loop bandwidth of a PLL that uses the AFM signal to multiply up further to a
multiple GHz network clock. This means that the impact of the sub harmonics on the application is negligible.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1(408) 9 44-0800 • fax +1(408) 474-1000 •
www.micrel.com
Rev 12/08/11 Page 3
(Prelim inary )
Analog Frequency Multiplier
PL565-68 VCXO
PHASE NOISE PERFORMANCE
Part
Number
Input
Freq.
Range
(MHz)
Output
Freq.
Range
(MHz)
Phase Noise at Frequency Offset From Carrier (dBc/Hz)
10
Hz
-59
100
Hz
-93
1
kHz
-122
10
kHz
-137
100
kHz
-143
1
MHz
-149
10
MHz
-155
Phase
Jitter
12KHz ~
20MHz
(ps)
0.07
Carrier
Freq.
(MHz)
PL565-68 62.5 - 160 125 - 320
311.04
Phase noise was measured using Agilent E5052B.
SUB-HARMONIC PERFORMANCE
Part
Number
PL565-68
Input
Output
Frequency Frequency
(MHz)
(MHz)
155.52
311.04
Spectral Specifications / Sub-harmonic Content (dBc), Freq. (MHz
)
Carrier Frequency
(Fc)
311.04
@ -50%
(Fc)
-60
@ +50%
(Fc)
-60
Note:
Spectral specifications were obtained usin g Agilent E7401A
AFM MULTIPLYING TECHNIQUE
The analog frequency multiplication is achieved through a “squaring” operation.
The math is as follows: SIN²(x) = 0.5 - 0.5×COS(2x)
A very important property of this processing is that the result is a pure sin e wave with double frequency. In theory
there are no sub harmonics but in practice the squaring operation is not perfect and a low level of sub harmonics
is present anyway. The key is that the resulting sub harmonics are very low and simple filtering with only one
inductor per squarer is adequate for excellent performance.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1(408) 9 44-0800 • fax +1(408) 474-1000 •
www.micrel.com
Rev 12/08/11 Page 4
(Prelim inary )
AFM DIE APPLICATION CIRCUIT
Analog Frequency Multiplier
PL565-68 VCXO
A 7x5mm ceramic substrate was designed to assemble and operate the AFM die at optimum performance:
VDD
PECLB
PECL
VCON
OE
GND
Substrate part number: Kyocer a KD-VB0F48
Please see PL565-68DC Tuning Assistant document for passive component values.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1(408) 9 44-0800 • fax +1(408) 474-1000 •
www.micrel.com
Rev 12/08/11 Page 5
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