REV. A

–12–

AD807

USING THE AD807

Ground Planes

Use of one ground plane for connections to both analog and

digital grounds is recommended.

Power Supply Connections

Use of a 10

µF capacitor between V

mended. Care should be taken to isolate the +5 V power trace

vide the CLKOUT and DATAOUT signals.

Use of 0.1

µF capacitors between IC power supply and ground

is recommended. Power supply decoupling should take place as

close to the IC as possible. Refer to the schematic, Figure 21,

for recommended connections.

Transmission Lines

Use of 50

Ω transmission lines are recommended for PIN, NIN,

CLKOUT, and DATAOUT signals.

Terminations

Termination resistors should be used for PIN, NIN, CLKOUT,

and DATAOUT signals. Metal, thick film, 1% tolerance resistors

are recommended. Termination resistors for the PIN, NIN sig-

nals should be placed as close as possible to the PIN, NIN pins.

Connections from +5 V to load resistors for PIN, NIN,

CLKOUT, and DATAOUT signals should be individual, not

daisy chained. This will avoid crosstalk on these signals.

A ceramic capacitor may be used for the loop damping capaci-

tor. Using a 0.15

µF, +20% capacitor for a damping factor of

five provides < 0.1 dB jitter peaking.

AD807 Output Squelch Circuit

A simple P-channel FET circuit can be used in series with the

data outputs when SDOUT indicates a loss of signal (Figure

of 4 ECL loads, plus 5 mA for all 4 ECL output stages). This

means that selection of a FET with ON RESISTANCE of

0.5

Ω will affect the common mode of the ECL outputs by only

31 mV.

1

2

5

6

7

3

4

8

16

15

12

11

10

14

13

9

SDOUT

PIN

NIN

THRADJ

DATAOUTN

DATAOUTP

CLKOUTN

CLKOUTP

CF1

CF2

AD807

P_FET

BYPASS

CAP

5V

Figure 29. Squelch Circuit Schematic

OUTLINE DIMENSIONS

Dimensions shown in inches and (mm).

16-Lead Small Outline IC Package

(R-16A)

PIN 1

0.1574 (4.00)

0.1497 (3.80)

0.2440 (6.20)

0.2284 (5.80)

1

16

9

8

0.0500 (1.27)

0.0160 (0.41)

8

°

0

°

0.0196 (0.50)

0.0099 (0.25)

x 45

°

0.0099 (0.25)

0.0075 (0.19)

0.0192 (0.49)

0.0138 (0.35)

0.0500

(1.27)

BSC

0.0688 (1.75)

0.0532 (1.35)

0.0098 (0.25)

0.0040 (0.10)

0.3937 (10.00)

0.3859 (9.80)