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參數(shù)資料
| 型號： | VM-702-FCJ-BAAN-156M250000 |
| 廠商： | VECTRON INTERNATIONAL |
| 元件分類： | XO, clock |
| 英文描述： | CRYSTAL OSCILLATOR, CLOCK, 156.25 MHz, LVPECL OUTPUT |
| 封裝： | ROHS COMPLIANT, HERMETIC SEALED, PLASTIC PACKAGE-6 |
| 文件頁數(shù)： | 5/8頁 |
| 文件大?。?/td> | 291K |
| 代理商： | VM-702-FCJ-BAAN-156M250000 |
Vectron International 267 Lowell Road, Hudson, NH 03051 Tel: 1-88-VECTRON-1 http://www.vectron.com
Package and Pinout
Table 4. Pinout
Pin #
Symbol
Function
1
E/D or NC
Enable/Disable
2
NC
No Connection
3
GND
Electrical and Lid Ground
4f
O
Output Frequency
5Cf
O
Complementary Output Frequency
6V
DD
Supply Voltage
HCSL Application Diagrams
The VM-702 incorporates a standard High Speed Current Logic, HCSL ,output scheme which is a 15mA current source switched between Out and Comple-
mentary Out. Being un-terminated drains, as shown in Figure 8, they require external 50 ohm resistors to ground as shown in Figure 9. HCSL is a high im-
pedance output with quick switching times, in can be advantageous to use a 10 to 30 ohm series resistor as shown in Figure 10, to help reduce overshoot/
ringing.
Figure 8.
Standard HCSL Output Configuration
Figure 9.
Single Resistor Termination Scheme
Figure 10.
In some cases a 10-30 ohm series resistor is
used to help reduce overshoot.
One of the most important considerations is terminating the Output and Complementary Outputs equally. An unused output should not be left un-termi-
nated, and if it one of the two outputs is left open it will result in excessive jitter on both. PC board layout must take this and 50 ohm impedance matching
into account. Load matching and power supply noise are the main contributors to jitter related problems.
15mA
Page5
50 Ω
1
6
2
5
3
4
Z
L
=50 ohms
Z
L
=50 ohms
50 Ω
1
6
2
5
3
4
50 Ω
Z
L
=50 ohms
Z
L
=50 ohms
10-30 Ω
Contact Pads are
Gold flash (0.003 um min ) over
Palladium (0.01-0.15um) over
Nickel (0.508-2.032um)
Figure 6. Package Outline Drawing
Figure 7. Pad Layout
0.85±0.05 [0.033±0.002]
2.54 [1.00]
1.4±0.10 [0..055±0.004]
1.1±0.10 [0.043±0.004]
7.0±0.10 [0.276±0.004]
2.8 [1.10]
5.0±0.10
[0.197±0.004]
3.7
[0.148]
Dimensions are in mm
Power Supply cap
is required
Via to Supply
Via to GND
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