VM-702 Datasheet, PDF (5/8 Pages) Vectron International, Inc – MEMS based HCSL, LVDS, LVPECL Oscillator

Table 4. Pinout
Pin #
Symbol
1
E/D or NC
2
NC
3
GND
4
f
O
5
Cf
O
6
V
DD
7.0±0.10 [0.276±0.004]
Package and Pinout
Function
Enable/Disable
No Connection
Electrical and Lid Ground
Output Frequency
Complementary Output Frequency
Supply Voltage
Contact Pads are
Gold flash (0.003 um min ) over
Palladium (0.01-0.15um) over
Nickel (0.508-2.032um)
2.54 [1.00]
Power Supply cap
1.4±0.10 [0..055±0.004] is required
1.1±0.10 [0.043±0.004]
Via to Supply
Via to GND
2.8 [1.10]
0.85±0.05 [0.033±0.002]
Dimensions are in mm
Figure 6. Package Outline Drawing
Figure 7. Pad Layout
HCSL Application Diagrams
15mA
1
6
2
5
3
4
50 Ω
Z =50 ohms
L
Z =50 ohms
L
50 Ω
1
6
10-30 Ω
2
5
Z =50 ohms
L
10-30 Ω
3
4
Z =50 ohms
L
50 Ω
50 Ω
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.
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.
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.
Vectron International • 267 Lowell Road, Hudson, NH 03051 • Tel: 1-88-VECTRON-1 • http://www.vectron.com
Page5