gs9015a Gennum Corporation, gs9015a Datasheet - Page 9

• Manufacturer Part Number: gs9015a
• Description: Serial Digital Reclocker Corporation
• Manufacturer: Gennum Corporation

TEST SETUP
Figure 13 shows a typical circuit for the GS9015A using a +5
volt supply. Figure 14 shows the GS9015A connections when
using a -5 volt supply.
The 0.1 F decoupling capacitors must be placed as close as
possible to the corresponding VCC pins.
The layout of the loop filter and RVCO components requires
careful attention. This has been detailed in an application
note entitled "Optimizing Circuit and Layout Design of the
GS9005A/15A", Document No. 521 - 32 - 00.
The loop voltage can be conveniently measured across the
10 nF capacitor in the loop filter. Tuning procedures are
described in the Temperature Compensation Section (page
11). The fixed value frequency setting resistors should be
placed close to the corresponding pins on the GS9015A.
All resistors in ohms, all capacitors in microfarads unless otherwise stated.
2
1
+5V
0.1
+5V
ECL DATA
INPUTS
STAR
ROUTED
10
11
5
6
7
8
9
5.6p
DDI
DDI
VCC1
VEE1
VEE1
ƒ/2
VEE3
10n
Fig. 13 GS9015A Typical Test Circuit Using +5V Supply
12 13 14 15 16 17 18
910
LOOP
VOLTAGE
TEST
POINT
4
GS9015A
3
2
1 28 27 26
See Figure 15
9
SDO
SDO
SCO
SCO
SS1
SS0
The Carrier Detect is an open-collector active high output
requiring a pull-up resistor of approximately 10 k .
The SS0, SS1, and CD pins should see a low AC impedance.
This is particularly important when driving the SS0, SS1 pins
with external logic. The use of 1nF decoupling capacitors at
these pins ensures this.
CD
+5V
25
24
23
22
21
20
19
+5V
+5V
0.1
0.1
10k
100
100
390
390
100
100
390
390
CLOCK
CLOCK
DATA
DATA
CARRIER
DETECT
OUTPUT
520 - 99 - 05