鈩?/div>
GS9010A is a monolithic integrated
circuit designed to be an Automatic Tuning Subsystem
(ATS) when used with the GS9005A Receiver or the
GS9015A Reclocker and the GS9000B or GS9000S Decoder.
The GS9010A ATS eliminates the need to manually set or
externally temperature compensate the Receiver or Reclocker
VCO. The GS9010A can also determine whether the
incoming data stream is 4茠sc NTSC, 4茠sc PAL or component
4:2:2.
The GS9010A is an enhanced version of the GS9010. Pin
compatible with the GS9010, the GS9010A offers improved
noise immunity to spurious HSYNC signals.
The GS9010A includes a ramp generator/oscillator which
repeatedly sweeps the Receiver/Reclocker VCO frequency
over a set range until the system is correctly locked. Once
locked, an automatic fine tuning (AFT) loop maintains the
VCO control voltage at its optimum centre point over
variations in temperature. During normal operation, the
GS9000B or GS9000S Decoder provides continuous HSYNC
pulses which disable the ramp/oscillator of the GS9010A.
This maintains the correct Receiver/Reclocker VCO
frequency. When an interruption to the incoming data
stream is detected by the Receiver/Reclocker, the Carrier
Detect goes LOW and opens the AFT loop in order to
maintain the correct VCO frequency for a period of typically
2 seconds. If the signal is re-established within this 2
seconds, the Receiver/Reclocker will rapidly relock. For
periods longer than typically 2 seconds, the VCO slowly
drifts towards a minimum frequency. Typically after 2
minutes, the serial clock output of the PLL settles to
approximately 85 MHz when 茠/2 is high or 170 MHz
when 茠/2 is low. The GS9010A is packaged in a 16 pin
wide SOIC, operates from a single +5 or -5 volt supply
and typically consumes 40 mW of power.
+
-
4
V
REF
+
LOOP FILTER
(from GS9005A)
5
20k
-
3
CARRIER DETECT
(from GS9005A)
18k
14
OSCILLATOR
OSCILLATOR
11
25k鈩?8
茠/2
(to GS9005A)
6
梅
4
COMPOSITE /
COMPONENT
DETECTOR
13
HSYNC
( (from GS9000B
o orGS9000S)
2
OUT
(to GS9005A)
16
STANDARDS
THRESHOLD ADJUST
APPLICATIONS
鈥?4茠sc, 4:2:2 & 360 Mb/s serial digital interfaces
ORDERING INFORMATION
Part Number
GS9010ACKC
GS9010ACTC
Package Type
16 Pin Wide SOIC
16 Pin Wide SOIC Tape
Temperature Range
0擄 to 70擄 C
0擄 to 70擄 C
1
PAL/NTSC
FREQUENCY
COMPENSATION
IN-
SWF
(from GS9000B
or GS9000S)
DELAY
10
9
FV CAP
Revision Date: August 1997
FUNCTIONAL BLOCK DIAGRAM
Document No. 521 - 01 - 05
GENNUM CORPORATION P.O. Box 489, Stn A, Burlington, Ontario, Canada L7R 3Y3 tel. (905) 632-2996 fax: (905) 632-5946
Gennum Japan Corporation: A-302 Miyamae Village, 2-10-42 Miyamae, Suginami-ku, Tokyo 168, Japan
tel. (03) 3334-7700
fax (03) 3247-8839
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