gs9005a Gennum Corporation, gs9005a Datasheet - Page 9

• Manufacturer Part Number: gs9005a
• Description: Serial Digital Receiver Corporation
• Manufacturer: Gennum Corporation

TEST SETUP
Figure 16 shows a typical circuit for the GS9005A using a +5
volt supply. The four 0.1 F decoupling capacitors must be
placed as close as possible to the corresponding V
The loop voltage can be conveniently measured across the
10nF 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 GS9005A.
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.
INPUT
22n
75
75
113
47p
47p
2
1
+5V
0.1
+5V
Fig.16 GS9005A Typical Test Circuit Using +5V Supply
ECL
DATA
INPUTS
STAR
ROUTED
+
10
10
11
5
6
7
8
9
5.6p
10n
DDI
DDI
VCC2
SDI
SDI
ƒ/2
VEE3
0.1
0.1
CC
12 13 14 15 16 17 18
pins.
LOOP
VOLTAGE
TEST
POINT
4
910
GS9005A
All resistors in ohms, all capacitors in microfarads, all inductors in henries unless otherwise stated.
3
2
9
1 28 27 26
SSI
When the Direct Digital Inputs are not used, one of these
inputs should be connected to V
and unwanted signals.
The Carrier Detect is an open-collector active high output
requiring a pull-up resistor of approximately 10 k .
The SS0, SS1, CD pins should see a low AC impedance. This
is particularly important when driving the SS0, SS1 pins with
external logic. The use of 1 nF decoupling capacitors at these
pins ensures this.
Figure 17 shows the GS9005A connections when using a -5
volt supply.
See Figure 18
SDO
SDO
SCO
SCO
SS1
SS0
CD
+5V
+5V
25
24
23
22
21
20
19
0.1
0.1
+5V
10k
+5V
DIGITAL
ANALOG
100
390
390
100
100
390
390
100
CC
CLOCK
DATA
DATA
CLOCK
CARRIER
DETECT
OUTPUT
to avoid picking up noise
520 - 28 - 11