PECL and LVDS Low Phase Noise VCXO (for 65-130MHz Fund Xtal)
FEATURES
• 65MHz to 130MHz Fundamental Mode Crystal.
• Output range: 65MHz – 130MHz (no PLL).
• Low Injection Power for crystal 50uW.
• PECL (PLL520-38) or LVDS output (PLL520-39).
• Integrated variable capacitors.
• Supports 2.5V or 3.3V-Power Supply.
• Available in 16-Pin (TSSOP or 3x3 QFN).
DESCRIPTION
The PLL520-38/-39 is a family of VCXO IC’s
specifically designed to pull high frequency
fundamental crystals from 65MHz to 130MHz, with
selectable PECL or LVDS outputs.. They achieve
very low current into the crystal resulting in better
overall stability. Their internal varicaps allow an on
chip frequency pulling, controlled by the VCON
input. Their very low jitter makes them ideal for the
most demanding timing requirements.
BLOCK DIAGRAM
PIN CONFIGURATION
VDD
P520-3x
16
15
14
13
12
11
10
9
N/C
VDD
XIN
XOUT
N/C
N/C
OE
VCON
GND
XOUT
XIN
N/C
OE
1
2
PLL 520-3x
3
4
5
6
7
8
VDD
12 11 109
13
14
15
16
123
4
N/C
8
7
6
5
N/C
N/C
GND
CLKC
VDD
CLKT
N/C
N/C
GND
CLKC
VDD
CLKT
VCON
XIN
Oscillator
Amplifier
w/
integrated
varicaps
OE
Q
Q
OUTPUT ENABLE LOGICAL LEVELS
Part # OEState
PLL520-38
XOUT
PLL520-38/-39
PLL520-39
OE input: Logical states defined by PECL levels for PLL520-38
47745 Fremont Blvd., Fremont, California 94538 Tel (510) 492-0990 Fax (510) 492-0991 www.phaselink.com Rev 09/20/04 Page 1
Logical states defined by CMOS levels for PLL520-39
GND
GND
VCON
0
(Default)
GND
Output enabled
1 Tri-state
0 Tri-state
1
(Default)
Output enabled
PLL520-38/-39
PECL and LVDS Low Phase Noise VCXO (for 65-130MHz Fund Xtal)
PIN DESCRIPTIONS
Name Number Type Description
XIN 2 I Crystal input. See Crystal Specifications on page 2.
XOUT 3 I Crystal output. See Crystal Specifications on page 2.
OE 6 I Output enable. See Output Enable Logic table on page 1.
VCON 7 I Voltage control input.
GND 8, 14 P Ground.
CLKT 11 O True output PECL (PLL520-38) or LVDS (PLL520-39).
CLKC 13 O Complementary output PECL (PLL520-38) or LVDS (PLL520-39).
N/C 4,5,9,10,15,16 - Not connected.
VDD 1, 12 P Power supply.
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
Ambient Operating Temperature* TA -40 85
Junction Temperature TJ 125
Lead Temperature (soldering, 10s) 260
ESD Protection, Human Body Model 2 kV
Exposure of the device under conditions beyond the limits specified by Maximum Ratings for extended periods may cause permanent 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.
* Note: Operating Temperature is guaranteed by design for all parts (COMMERCIAL and INDUSTRIAL), but tested for COMMERCIAL grade only.
°C
°C
°C
°C
2. Crystal Specifications
PARAMETERS SYMBOL CONDITIONS MIN. TYP. MAX. UNITS
Built-in Capacitance
Inter-electrode capacitance C0
C0/C1 ratio (gamma)
Oscillation Frequency OF Fund. 65 130 MHz
CX+ 2
CX- 2
γ
65MHz to 130MHz
(VDD=3.3V)
300 -
pF
2.6
47745 Fremont Blvd., Fremont, California 94538 Tel (510) 492-0990 Fax (510) 492-0991 www.phaselink.com Rev 09/20/04 Page 2
PLL520-38/-39
PECL and LVDS Low Phase Noise VCXO (for 65-130MHz Fund Xtal)
PhaseLink Corporation, reserves the right to make changes in its products or specifications, or both at any time without notice. The information
furnished by Phaselink is believed to be accurate and reliable. However, PhaseLink makes no guarantee or warranty concerning the accuracy of said
information and shall not be responsible for any loss or damage of whatever nature resulting from the use of, or reliance upon this product.
LIFE SUPPORT POLICY: PhaseLink’s products are not authorized for use as critical components in life support devices or systems without the
express written approval of the President of PhaseLink Corporation.
47745 Fremont Blvd., Fremont, California 94538 Tel (510) 492-0990 Fax (510) 492-0991 www.phaselink.com Rev 09/20/04 Page 7
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