Product: VCXO (Voltage Controlled Crystal Oscillators)
Output: LVDS Square Wave

GDF and GDW Series (LVDS VCXO) ...... [ (1.27 MB) ]

• GDF and GDW use a high-Q fundamental crystal and low jitter multiplier circuit.
• GDF offers < 1 ps phase jitter and only a fraction of the cost of a high frequency fundamental crystal VCXO.
• GDW series has moderate jitter and low cost.

"GDF" and "GDW" series VCXO use fundamental mode (inverted mesa) crystal to achieve wide frequency deviation, stable and clean signals. No multiplier no overtone or phase lock loop technique is used. Jitter is as low as 1ps for the 155.520 MHz for SONET/SDH applications. Also, the inherent advantages of differential PECL ECL signal transmission provide improved noise immunity and makes the system less susceptible to ground noise.

General Specifications
Ta=+25°C, Inclusive of 25°C calibration tolerance, operating temperature range, input voltage variation, load change, aging, shock and vibration.

Model " GDF " Series " GDW " Series
Technology High Q Fundamental Crystal + Low Jitter Multiplier Circuit High Q Fundamental Crystal + Multiplier Circuit
Output Logic LVDS
Frequency Range 38.0 MHz ~ 640.0 MHz 750 KHz ~ 800.0 MHz
Supply Voltage (VDD) +3.3 VDD ± 5% +3.3 VDD ± 5%
Supply Voltage Code " 3 " " 3 "
Output Voltage HIGH "1", VOH 1.4 V typ. ; 1.6 V max.
Output Voltage LOW "0", VOL 0.9 V min. ; 1.1 V typ.
Differential Output Voltage, VOD 247 mV min.; 355 mV typical ; 454 mV max. Output 1 - Output 2
Differential Output Voltage, dVOD -50 mV min. ; 50 mV max.
Output Offset Voltage, VOS 1.125 V min. ; 1.200 V typ. ; 1.375 V max.
Offset Magnitude Error, dVOS 0 mV min. ; 3 mV typ. ; 25 mV max.
Integrated Phase Jitter (12 KHz to 20 MHz) 0.4 ps typ. ; 0.5 ps max. For 156.250 MHz 2.6 ps typ. ; 4 ps max. For 155.520 MHz
Period Jitter 3 ps typ. ; 5 ps max. For 156.250 MHz 4.3 ps typ. For 155.520 MHz
Period Jitter (peak-to-peak) 20 ps typ. ; 30 ps max. For 156.250 MHz 27 ps typ. For 155.520 MHz
Phase Noise Offset Frequency: 156.250 MHz Frequency: 155.520 MHz
10 Hz -62 dBc / Hz -60 dBc / Hz
100 Hz -92 dBc / Hz -90 dBc / Hz
1 KHz -120 dBc / Hz -115 dBc / Hz
10 KHz -132 dBc / Hz -125 dBc / Hz
100 KHz -128 dBc / Hz -119 dBc / Hz
1 MHz -140 dBc / Hz -120 dBc / Hz
10 MHz -150 dBc / Hz -140 dBc / Hz
Current Consumption (15 pF) 38 MHz ~ 100 MHz: 65 mA max. < 24 MHz: 25 mA
100.01 MHz ~ 320 MHz : 80 mA max. 24.01 MHz ~ 96 MHz: 65 mA max.
320.01 MHz ~ 640 MHz : 90 mA max. 96.01 MHz ~ 700 MHz : 100 mA max.
Rise Time (Tr) & Fall Time (Tf) 0.7 ns max. (20% ↔ 80% of the PECL wave form 1.5 ns max. (20% ↔ 80% of the PECL wave form
Frequency Stability(1)
Commercial temp. range (code "C") 		"A": ±25 ppm over 0°C to +70°C
"B":±50 ppm over 0°C to +70°C
"C":±100 ppm over 0°C to +70°C
For non-standard please give desired frequency stability after the "C".
For example "C20" is ±20 ppm over 0 to +70°C
Frequency Stability(1)
Industrial temp. range (code "I") 		"D":±25 ppm over -40°C to +85° (not available on all packages)
"E":±50 ppm over -40°C to +85°C
"F":±100 ppm over -40°C to +85°C
For non-standard please give desired frequency stability after the "I".
For example "I20" is ±20 ppm over -40 to +85°C
Load RL = 50 to (VDD -2.0V). See test circuit below.
Start-up Time 10 ms. (max.)
Duty Cycle 50% ± 5% ( measured at 1.25 V)
Tri-state Function Tri-state Enable High. No connection or 70% of VDD min. is applied to a Tri-state pad to enable both outputs.
30% of VDD max. to disable both outputs (high impedance).
Linearity 6% typ. ; 10% max.
Modulation Bandwidth (at -3 dB) 25 KHz min. 0V ≤ Vcontrol ≤ 3.3V
Input Impedance 60 KΩ min. 2 MΩ min.
Slope Polarity Monotonic and Positive: Increasing control voltage always increases output frequency.
Aging ±3 ppm max. first year / ±2 ppm max. / year for subsequent years.

Product Summary:

Output Wave Form: Square Wave

Package Code

Frequency Range

Assembly Technique

Package Description
Thru-Hole Types
4-Pin Model
GDF14 GDW14 19.440 ~ 250 MHz 4 pin DIL full size. Hermetically sealed. Can height = 7.0 mm. Sealed crystal inside. 12.8 x 20.2 x 7.8H
[0.504 x 0.795 x 0.307]
GDF8 GDW8 Half size 4 pin DIP. Hermetically sealed. 12.8 x 12.8 x 5.88H
[0.504 x 0.504 x 0.231]
5-Pin Model
GDF514 GDW514 19.440 ~ 250 MHz 5 pin DIL full size. Hermetically sealed. Can height = 7.0 mm. Sealed crystal inside. 12.8 x 20.2 x 7.8H
[0.504 x 0.795 x 0.307]
6-Pin Model
GDF614 GDW614 19.440 ~ 250 MHz 6 pin DIL full size. Hermetically sealed. Can height = 7.0 mm. Sealed crystal inside. 12.8 x 20.2 x 7.8H
[0.504 x 0.795 x 0.307]
Gull Wing Surface Mount Types
4-Pin Model
GDF24 GDW24 19.440 ~ 250 MHz 4 pin DIL full size. Hermetically sealed. Can height = 7.0 mm. Sealed crystal inside. 12.8 x 20.2 x 8.5H
[0.504 x 0.795 x 0.335]
GDF8 GDW8 Half size DIP. Hermetically sealed. 12.8 x 12.8 x 7.6H
[0.504 x 0.504 x 0.300]
5-Pin Model
GDF524 GDW524 19.440 ~ 250 MHz 5 pin DIL full size. Hermetically sealed. Can height = 7.0 mm. Sealed crystal inside. 12.8 x 20.2 x 8.5H
[0.504 x 0.795 x 0.335]
6-Pin Model
GDF624 GDW624 19.440 ~ 250 MHz 6 pin DIL full size. Hermetically sealed. Can height = 7.0 mm. Sealed crystal inside. 12.8 x 20.2 x 8.5H
[0.504 x 0.795 x 0.335]
Leadless Surface Mount Types
GDF575 GDW575 19.440 ~ 250 MHz 6 pad Leadless. 5 x 7.5 x 2.65H
[0.197 x 0.295 x 0.104]
GDF62 GDW62 6 pad Leadless. 9.6 x 11.4 x 2.5H
[0.378 x 0.449 x 0.098]
GDF64 GDW64 6 pad Leadless. 9.6 x 11.4 x 4.7H
[0.378 x 0.449 x 0.185]

(1)Inclusive of 25°C tolerance, operating temperature range, ±10% input voltage variation, load change, aging, shock and vibration.

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