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-802 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

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

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 7. Pad Layout

Units: mm (inches)

3.2±0.05 [0.126±0.002]

0.85±0.05 [0.033±0.002]

5.0±0.05

[0.197±0.002]

1.27 [0.050]

0.64±0.05

[0.025±0.002]

Figure 6. Package Outline Drawing

Figure 7. Pad Layout

Power Supply cap

is required

1.27 [0.050]

1.2 [0.047]

0.64 [0.025]

1.1 [0.043]

Via to GND

Via to Supply