(Preliminary) ABV8068/69
320-640MHz Low Phase Noise VCXO
30332 Esperanza., Rancho Santa Margarita, Ca 92688 Ph: 949-546-8000 Fax: 949-546-8001 www.Abracon.com 9/1/05 Page 1
FEATURES
• Less than 0.4ps RMS (12KHz-20MHz) phase
jitter for all fr equencies.
• Low phase noise output (@ 1MHz frequency
offset)
∗ -140dBc/Hz for 320.0MHz,
∗ -131dBC/Hz for 622.08MHz
• 20MHz-40MHz crystal input.
• 320MHz-640MHz output.
• PECL, or LVDS outputs.
• No external varicap required.
• Output Enable selector.
• Wide pull range (+/-200ppm).
• 3.3V operation.
• Available in 3x3 QFN or 16-pin TSSOP
packages.
DESCRIPTION
The ABV806X is a monolithic low jitter and low
phase noise VCXO, capable of 0.4ps RMS phase
jitter and PECL or LVDS outputs, covering a wide
frequency output range up to 640MHz. It allows the
control of the output frequency with an input voltage
(VCON), us ing a low cost crystal.
The ABV806X is designed to address the demanding
requirements of high performance applications such
as SONET, GPS, Video, etc.
BLOCK DIAGRAM
PACKAGE PIN ASSIGNMENT
16-pin TSSOP
3x3mm QFN
Note1: ^ Denotes internal pull up resistor.
Phase
Detector
Charge
Pump
Loop
Filter
VCO
(FXiNx16)
VCO
Divider
XTAL
OSC
QBAR
OE
XIN
XOUT Q
VCON
VARICAP
+
Performance Tuner
Output
Divider
ABV806X
1
2
3
4
5
6
7
8
VDDANA
9
10
11
12
13
14
15
16
XIN
XOUT
SEL2^
OE_CTRL
VCON
GNDANA
LP
SEL0^
GNDBUF
SEL1^
GNDBUF
QBAR
VDDBUF
Q
LM
ABV806X
GNDBUF
VDDBUF
Q
QBAR
XIN
DNC
DNC
VDDANA
DNC
XOUT
OE_CTRL
VCON
LP
GNDANA
LM
GNDBUF
4
16
15
14
1312 11 10 9 8
7
6
5
123
(Preliminary) ABV8068/69
320-640MHz Low Phase Noise VCXO
30332 Esperanza., Rancho Santa Margarita, Ca 92688 Ph: 949-546-8000 Fax: 949-546-8001 www.Abracon.com 9/1/05 Page 2
OUTPUT ENABLE LOGICAL LEVELS
Part # OE State
0 (Default) Output enabled
ABV8068 (PECL) 1 Tri-state
0 Tri-state
ABV8069 (LVDS) 1 (Default) Output enabled
PIN DESCRIPTIONS
Name TSSOP
Pin number 3x3mm QFN
Pin number Type Description
VDDANA 1 11 P VDD for analog Circuitry.
XIN 2 12 I Crystal input pin. (See Crystal Specif ications on page 4).
XOUT 3 13 O Crystal output pin . (See Crystal Specificat ions on page 4).
DNC 4 14 - Do Not Connect
OE_CTRL 5 15 I Output enab le control pin. (See OE_CTRL Logic Levels above).
VCON 6 16 I Voltage control inp ut.
GNDANA 7 1 P Ground for analog circuitry.
LP 8 2 -
LM 9 3 -
Tuning inductor connection. The inductor is recommended to be
a high Q small size 0402 or 0603 SMD component, an d must be
placed between LP and adjacent LM pin. Place inductor as close
to the IC as possible to minimize para sitic effects and to
maintain inductor Q.
GNDBUF 10 4 P GND connection for output buffer circuitry.
Q 11 5 O PECL or LVDS output.
VDDBUF 12 6 P
VDD connection for output buffer circuitry. VDDBUF should be
separately decoupled from other VDDs whenever possible.
QBAR 13 7 O Complementary PECL, LVDS output.
GNDBUF 14 8 P GND connection for output buffer circuitry.
DNC 15 9 - Do Not Connect
DNC 16 10 - Do Not Connect
(Preliminary) ABV8068/69
320-640MHz Low Phase Noise VCXO
30332 Esperanza., Rancho Santa Margarita, Ca 92688 Ph: 949-546-8000 Fax: 949-546-8001 www.Abracon.com 9/1/05 Page 3
FREQUENCY SELECTIO N TABLE
SEL2 SEL1 SEL0 Selected Multiplier/Output Frequency
0 0 0 VCO Max*
0 0 1 VCO Min*
1 1 1 Fin x 16
All Other Combin ations Reserved
All SEL pads have internal pull- ups (default val ue is ‘1’). Bond to GND to set to 0.
* Special Test Modes to help selecting the inductor value for the target output frequency.
PERFORMANCE TUNING & INDUCTOR VALUE SELECTION
Please refer to Abracon’s ‘Tuning Assistance’ software to automatically calculate the optimum inductor values for
your application. In addition, the chart below could be used as a reference for quick inductor value selection.
Please note that the inductor values mentioned in the table below, or when using the ‘Tuning Assistance’ are
derived based on the parasitic values of Abracon’s evaluation board. For performance enhancement of your
custom board design, please follow the following instruction:
Use the special test modes “VCO Max” and “VCO Min” to determine the optimum inductor value. “VCO Max”
represents the high end of the VCO range and “VCO Min” represents the low end of the VCO range. The output
frequency in the “VCO Max” and “VCO Min” test modes is VCO/16. This means that the output frequencies are
around the crystal frequency that will be used. The optimum inductor value is where the target crystal frequency
is closest to the middle between the “VCO Max” and “VCO Min” output frequencies. In this case the VCO will lock
in the middle of its tuning range with maximum margin on either side.
(Preliminary) ABV8068/69
320-640MHz Low Phase Noise VCXO
30332 Esperanza., Rancho Santa Margarita, Ca 92688 Ph: 949-546-8000 Fax: 949-546-8001 www.Abracon.com 9/1/05 Page 4
ELECTRICAL SPECIFICATIONS
1. Absolute Maximum Ratings
PARAMETERS SYMBOL MIN. MAX. UNITS
Supply Voltage VDD 4.6 V
Input Voltage, dc VI -0.5 VDD+0.5 V
Output Voltage, dc VO -0.5 VDD+0.5 V
Storage Temperature TS -65 150
°C
Ambient Operating T emperature* TA -40 85 °C
Junction Temperature TJ 125
°C
Lead Temperature ( soldering, 10s) 260 °C
ESD Protection, Human Body Model 2 kV
Exposure of the d evice under conditions beyond the limits specified by Maximum Ratings for extended periods may cause pe rmanent damage to the
device and affect product reliability. These conditions represent a stress rating on ly, and functional operations of the device at these or any other
conditions above the operational limits noted in this spec ification is not im plied.
* Note: Operating Temperature is guaranteed by design fo r all parts (C OMMERCIAL and INDUSTRIAL), but tes ted for COMMERCIAL grade only .
2. Crystal Specifications
PARAMETERS SYMBOL CONDITIONS MIN. TYP. MAX. UNITS
Crystal Resonator Freque ncy FXIN Parallel Fundamental Mod e 20 40 MHz
at VCON = 0V 17.7
at VCON = 1.65V 9.5
Crystal Loading Rat ing CL (xtal) at VCON = 3.3V 5.4 pF
Crystal Pullability C0/C1 (xtal) AT cut 250 -
Recommended ESR RE AT cut 30 Ω
Note: Crystal Loading rating: The listed numbers are for the IC only. Specify the crystal fo r the value at V CON = 1.65V and add the PCB & package
parasitic. A ro und number (i.e. 12pF) can be achieved by adding ex ternal capacitors. Try to add the same value to XIN and XOUT, and please note,
that frequency pullin g and oscillator gain may decrease.
3. Voltage Control Crystal Oscillator
PARAMETERS SYMBOL CONDITIONS MIN. TYP. MAX. UNITS
VCXO Stabilization Time * TVCXOSTB From power valid 10 ms
VCXO Tuning Range FXIN = 20 – 40MHz;
XTAL C0/C1 < 250
0V ≤ VCON ≤ 3.3V 500 ppm
CLK output pullab ility VCON=1.65V, ±1.65V ±200 ppm
VCXO Tuning Characteristic 150 ppm/V
Pull range linearit y 10 %
VCON pin input impedan ce 60
kΩ
VCON modulation BW 0V ≤ VCON ≤ 3.3V, -3dB 25 kHz
Note: Parame ters denoted with an asterisk (*) repres ent nominal characteriza tion data and are not production tes ted to any specific limits.
(Preliminary) ABV8068/69
320-640MHz Low Phase Noise VCXO
30332 Esperanza., Rancho Santa Margarita, Ca 92688 Ph: 949-546-8000 Fax: 949-546-8001 www.Abracon.com 9/1/05 Page 5
4. General Electrical Specifications
PARAMETERS SYMBOL CONDITIONS MIN. TYP. MAX. UNITS
Supply Current,
Dynamic (with
Loaded Outputs) IDD PECL/LVDS 320MHz<Fout<640MHz 90/70 mA
Operating Volt age VDD 2.97 3.63 V
Output Clock
Duty Cycle @ 50% VDD (CMOS)
@ 1.25V (LVDS)
@ VDD – 1.3V (PECL)
45
45
45
50
50
50
55
55
55 %
Short Circuit
Current ±50 mA
5. Jitter Specifica tions
PARAMETERS CONDITIONS FREQUENCY MIN. TYP. MAX. UNITS
320.0MHz 0.4 0.5
Integrated jitte r RMS Integrated 12 kHz to 20 MHz 622.08MHz 0.4 0.6 ps
320.0MHz 3 5
Period jitter RMS With capaciti ve decoupling
between VDD and GND.
Over 10,000 cycles. 622.08MHz 6 8 ps
320.0MHz 25 30
Period jitter Peak-to-
Peak With capacitive deco upling
between VDD and GND.
Over 10,000 cycles. 622.08MHz 50 70 ps
6. Phase Noise Specifications
PARAMETERS FREQ. @10Hz @100Hz @1kHz @10kHz @100kHz @1M @10M UNITS
320.0MHz -59 -86 -116 -129 -124 -140 -148
Phase Noise2
relative to
carrier (typical) 622.08MHz -48 -80 -108 -118 -114 -131 -138
dBc/Hz
Note: Phase Nois e measured at VCON = 0V
(Preliminary) ABV8068/69
320-640MHz Low Phase Noise VCXO
30332 Esperanza., Rancho Santa Margarita, Ca 92688 Ph: 949-546-8000 Fax: 949-546-8001 www.Abracon.com 9/1/05 Page 6
8. LVDS Electrical Characteristics
PARAMETERS SYMBOL CONDITIONS MIN. TYP. MAX. UNITS
Output Differential Voltage VOD 247 355 454 mV
VDD Magnitude Change ∆VOD -50 50 mV
Output High Voltage VOH 1.4 1.6 V
Output Low Voltage VOL 0.9 1.1 V
Offset Voltage VOS 1.125 1.2 1.375 V
Offset Magnitu de Change ∆VOS
RL = 100 Ω
(see figure)
0 3 25 mV
Power-off Leakage IOXD Vout = VDD or GND
VDD = 0V ±1 ±10 uA
Output Short Circuit Current IOSD -5.7 -8 mA
9. LVDS Switching Characteristics
PARAMETERS SYMBOL CONDITIONS MIN. TYP. MAX. UNITS
Differential Clock Rise Time tr 0.2 0.7 1.0 ns
Differential Clock Fall Time tf
RL = 100 Ω
CL = 10 pF
(see figure) 0.2 0.7 1.0 ns
OUT
OUT
V
OD
V
OS
50
Ω
50
Ω
OUT
V
DIFF
R
L
= 100
Ω
C
L
= 10pF
C
L
= 10pF
LVDS Switching Test CircuitLVDS Levels Test Circuit
LVDS Transistion Time Waveform
OUT
OUT
OUT
0V (Differential)
0V
20%
80%
20%
80%
t
R
t
F
V
DIFF
(Preliminary) ABV8068/69
320-640MHz Low Phase Noise VCXO
30332 Esperanza., Rancho Santa Margarita, Ca 92688 Ph: 949-546-8000 Fax: 949-546-8001 www.Abracon.com 9/1/05 Page 7
10. PECL Electrical Characteristics
PARAMETERS SYMBOL CONDITIONS MIN. MAX. UNITS
Output High Voltage VOH V
DD – 1.025 V
Output Low Voltage VOL RL = 50 Ω to (VDD – 2V)
(see figure) V
DD – 1.620 V
11. PECL Switching Cha racteristics
PARAMETERS SYMBOL CONDITIONS MIN. TYP. MAX. UNITS
Clock Rise Time tr @2 0/80% - PECL 0.6 1.5 ns
Clock Fall Time tf @80/20% - PECL 0.5 1.5 ns
OUT
OUT
50
Ω
50
Ω
PECL Levels Test Circuit
PECL Transistion Time Waveform
OUT
OUT
50%
20%
80%
t
R
t
F
VDD
DUTY CYCLE
45 - 55% 55 - 45%
50%
OUT
OUT
t
SKEW
PECL Output Skew
2.0V
(Preliminary) ABV8068/69
320-640MHz Low Phase Noise VCXO
30332 Esperanza., Rancho Santa Margarita, Ca 92688 Ph: 949-546-8000 Fax: 949-546-8001 www.Abracon.com 9/1/05 Page 8
LAYOUT RECOMMENDATIONS
PCB LAYOUT CONSIDERATIONS FOR PERFORMANCE OPTIMIZATION
The following guidelines are to assist you with a performance optimized PCB design:
- K eep all t he PCB trace s to ABV80 as s hort as
possible, as well as keeping all other traces as
far away from it as possible.
- Place the crystal as close as possible to both
crystal pins of the device. This will reduce the
cross-talk between the crystal and the other
signals.
- Separate crystal pin traces from the other signals
on the PCB, but allow ample distance between
the two crystal pin traces.
- Place a 0.01µF~0.1µF decoupling capacitor
between VDD and GND, on the component side
of the PCB , close to the V DD pin. It is not
recommended to place this component on the
backside of the PCB. Going through vias will
reduce the signal integrity, causing additional
jitter and phase noise.
- It is highly recommended to keep the VDD and
GND traces as short as possible.
- Please contact Abracon for the application note
on how to design outputs driving long traces or
the Gerber files for the ABV80 layout.
A
BV806X
(VCXO)
16-pin TSSOP
A
BV806X
(VCXO)
3x3 QFN
(Preliminary) ABV8068/69
320-640MHz Low Phase Noise VCXO
30332 Esperanza., Rancho Santa Margarita, Ca 92688 Ph: 949-546-8000 Fax: 949-546-8001 www.Abracon.com 9/1/05 Page 9
PACKAGE INFORMATION
16-PIN SSO P
CL
A
EH
D
A1
eB
16 PIN TSSOP ( mm )
Symbol Min. Max.
A - 1.20
A1 0.05 0.15
B0.190.30
C0.090.20
D4.905.10
E4.304.50
H 6.40 BSC
L0.450.75
e 0.65 BSC
16-PIN 3x3 QFN
(Preliminary) ABV8068/69
320-640MHz Low Phase Noise VCXO
30332 Esperanza., Rancho Santa Margarita, Ca 92688 Ph: 949-546-8000 Fax: 949-546-8001 www.Abracon.com 9/1/05 Page 10
ORDERING INFORMATION
Abracon Corporation, reserves the right to make changes in its products or specifications, or both at any time without notice. The information
furnished by Abra con is believed to be accurate and reliable. However, Abracon makes no guaran tee or warranty concern ing the accuracy of s aid
information and shall n ot be responsible for any loss or damage of whatever nature resulting from the use of, or reliance upon this p roduct.
LIFE SUPPORT POLICY : Abracon’s products are n ot authorized for use as critic al components in life support devices or sy stems without the exp ress
written approval of the President of Abracon Corporation .
For part ordering, please contact our Sales Department:
30332 Esperanza., R ancho Santa Margarit a, Ca 92688
Ph: 949-546-8000 Fax: 949- 546-8001
PART NUMBER
The order number for this d evice is a combination of th e following:
Device number, Packag e type and Operating tempera ture range
ABV806X X C L T
Order Number Marking Package Option
ABV8068OC ABV8068OC TSSOP - Tube
ABV8068OC-T ABV8068OC TSSOP - Tape & Reel
ABV8068OCL ABV 8068OCL TSSOP - Tube (GREEN Packag e)
ABV8068OCL-T ABV8068OCL TSSOP - Tape & Reel (GREEN Package)
ABV8068QC V8068QC QFN - Tube
ABV8068QC-T V8068QC QFN - Tape & Reel
ABV8068QCL V8068QCL QFN - Tube (GREEN Package)
ABV8068QCL-T V8068QCL QFN - Tape & Reel (GREEN Package)
ABV8069OC ABV8069OC TSSOP - Tube
ABV8069OC-T ABV8069OC TSSOP - Tape & Reel
ABV8069OCL ABV 8069OCL TSSOP - Tube (GREEN Packag e)
ABV8069OCL-T ABV8069OCL TSSOP - Tape & Reel (GREEN Package)
ABV8069QC V8069QC QFN - Tube
ABV8069QC-T V8069QC QFN - Tape & Reel
ABV8069QCL V8069QCL QFN - Tube (GREEN Package)
ABV8069QCL-T V8069QCL QFN - Tape & Reel (GREEN Package)
TEMPERATURE
C=COMMERCIAL
I=INDUSTRAL
PACKAGE TYPE
O=TSSOP
Q= QFN 4x4
L= GREEN PACKAGE
NONE= REGULAR PACKAG E
T= TAPE & REEL
NONE= TUBE
PART NUMBER
