Instruction Manual
071-0515-00
FIRST PRINTING: NOVEMBER 1998
8980TLS
NTSC TO HDTV TRI-LEVEL SYNC CONVERTER
Contacting Grass Valley Group
Region Voice Fax Address Web Site
North America (800) 547-8949
530-478-4148
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Support: +852-2585-6579
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Support: +44 (0) 1628-405830
Copyright © Grass Valley Group. All rights reserved.
This document may not be copied, in whole or in part, or otherwise reproduced, except as specifically
permitted under U.S. copyright law, without the prior written consent of Grass Valley Group, P.O. Box
1114, Grass Valley, CA 95945. GRASS VALLEY GROUP is a registered trademark and Grass Valley is
a trademark of Grass Valley Group. All registered trademarks and trademarks are property of their respective holders. Grass Valley Group products are covered by U.S. and foreign patents, issued and
pending. Product options and specifications subject to change without notice. The information in this
manual is furnished for informational use only, is subject to change without notice, and should not be
construed as a commitment by Grass Valley Group. Grass Valley Group assumes no responsibility or
liability for any errors or inaccuracies that may appear in this publication.
(530) 478-3347 Grass Valley Group
+852-2802-2996
+44 (0) 1628 403698
P.O. Box 599000
Nevada City, CA 95959-7900
USA
www.grassvalleygroup.com
Contents
Preface
About This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
8980TLS NTSC to HDTV
Tri-level Sync Converter
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Select HDTV Standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Module Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Cabling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Loopthrough Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Adjustments and Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Index
8980TLS Instruction Manual iii
Contents
iv 8980TLS Instruction Manual
Preface
About This Manual
This manual describes the features of a specific module of the 8900 Series
Distribution Amplifier family. As part of this module family, it is subject to
Safety and Regulatory Compliance described in the 8900 Series frame and
power supply documentation (see the
8900 Series User’s Guide ).
8980TLS Instruction Manual v
Preface
vi 8980TLS Instruction Manual
8980TLS NTSC to HDTV Tri-level Sync Converter
Introduction
The 8900 Series product line is a family of serial digital distribution amplifiers (DAs) and signal processors. It consists of modules that reside in a 2
rack unit frame holding up to ten modules. A variety of modules are available that can provide fanout, timing/reclocking, monitoring, or error
detection and handling capabilities. Modules are selected by the user to
suit their particular requirements.
Performance
The 8980TLS module is a tri-level sync converter that accepts an NTSC
color black reference input and outputs four duplicate tri-level video sync
signals.
Tri-level sync is the required reference signal for many HDTV devices such
as VTRs and master control or production switchers. It provides the ability
to extract a high precision low jitter horizontal timing reference for HDTV
equipment. The 8980TLS module provides a very stable tri-level sync
output locked to an NTSC input by using the NTSC color burst as its timing
reference. This provides immunity from any NTSC sync timing jitter that
may be present. A differential input is provided for the reference signal to
provide immunity from any common mode hum or noise that may be
present. An NTSC reference signal with color burst is required for proper
operation.
8980TLS Instruction Manual 1
8980TLS NTSC to HDTV Tri-level Sync Converter
Functional Description
Refer to Figure 1 while reading this functional description. The 525-line
NTSC reference input signal feeds a sync separator and a color burst phase-
locked loop. The color burst phase-locked loop generates an output at six
times subcarrier frequency that is locked to the incoming color burst. This
six-times subcarrier frequency signal drives a counter which produces an
output at 33.7 kHz which is a subharmonic of the 74.17 MHz high defini-
tion clock frequency. Another output from the color burst locked loop at
two-times subcarrier frequency feeds SC/H phase tracking circuitry. This
circuit resolves any timing variation between the separated horizontal sync
and incoming burst phase which may be caused by reference signal SC/H
phase variations. The phase corrected horizontal timing is gated with ref-
erence field timing to create an output at frame rate (29.97 Hz). This output
is used to set the phase of the 33.7 kHz generator to a known value once per
frame.
The high definition timing generator uses the 33.7 kHz signal as a reference
to generate a clock signal for the pulse generation logic. The frame rate
pulse is used by the high definition timing generator to set its phase once
per frame. Timing control switches at the front of the module feed into the
sync generator logic. Output pulses are produced by the sync generator
logic and are shifted in time with respect to the 33.7 kHz and frame rate
pulses by an amount determined by the timing controls. The logic pulses
from the sync generator logic are shaped and feed an output line-driver
amplifier which provides the module’s four isolated outputs.
NTSC
Reference
Input
SC/H
Centering
Adjustment
Sync Separator
and
SC/H
Tracker
Burst
Phase
Locked
Loop
Figure 1. 8980TLS Functional Block Diagram
Reference Frame Pulse
33.7 KHz
Generator
Definition
Generator
Output
Timing
Controls
High
Sync
HDTV
Video
Standard
Selection
Output
Level
Output
Amplifier
Output
DC
Tri-level
Sync
Outputs
0515_01
2 8980TLS Instruction Manual
Specifications
Specifications
Table 1. 8980TLS Specifications
Parameter Value
Input
Input signal type Looping analog 525 line NTSC color black, per SMPTE 170M
Signal level Sync and burst each 286 mV p-p +/-6 dB
Return loss Greater than 40 dB to 5 MHz
Maximum common mode signal 10 V p-p at 60 Hz
Outputs
Output signal type Four duplicate outputs of analog black with tri-level sync locked to the
Signal standards User selectable (both at 59.94 Hz vertical frequency):
Tri-level sync return loss Greater than 40 dB to 10 MHz
Output to output isolation Greater than 40 dB to 10 MHz
Tri-level sync output timing
Output timing range Greater than 1 video frame
Increments of adjustment 54 ns
Method of control 5 sixteen-position rotary switches on front of module
Environmental
Operating temperature range 0 to 45° C, noncondensing
Non-operating temperature range -40 to +70° C, noncondensing
Power Requirements
Power dissipation 3.6 W from +12 V, 1.7 W from -12 V, total 5.3 W
Physical
Frame Resides in standard 2 rack unit 8900 Series frame
NTSC reference input.
1080 active line interlaced scan conforming to SMPTE 240M or,
720 active line progressive scan per SMPTE 296M
8980TLS Instruction Manual 3
8980TLS NTSC to HDTV Tri-level Sync Converter
Installation
To install the 8980TLS module:
■
Select the proper HDTV video standard.
■
Insert the module in the selected frame slot.
■
Cable and terminate signal ports.
■
Adjust output timing to input reference
Select HDTV Standard
Jumper JP1 on the top edge of the module (see Figure 2) selects the HDTV
video standard for the output signals—1080i or 720p. These signals
conform to SMPTE 240M and SMPTE 296M standards, respectively.
1080I
1080I
720P
HDTV
JP1
Jumper for
1080i
720P
Standard
Selection
Jumper for 720p
8980
Figure 2. HDTV Video Standard Selection Jumper
0515_03
4 8980TLS Instruction Manual
Module Installation
There are ten cell locations in the frame to accommodate either analog or
digital modules. These are the left ten locations. Refer to Figure 3.
The two cells on the right are allocated for the power supplies. For additional information concerning the Power Supply module, refer to the
Power Supply manual.
The third cell from the right is allocated for the Controller module. This
module provides the interface for the forced air cover, as well as the SMPTE
269M fault reporting (health alarm) and EDH network. For additional
information concerning the Controller module, refer to the Controller
manual.
Installation
Any 8900 Module
Controller
Module
(only)
Figure 3. 8900 Series Frame
Power
Supplies
(only)
To install a module into the frame, follow these steps:
1.
Insert the module into the frame, connector end first, with component
side of the module facing to the right and ejector tab to the top.
2.
Verify that the module connector seats properly against the backplane.
3.
Press the ejector tab in to seat the module in place.
0515_04
8980TLS Instruction Manual 5
Ω
Ω
Ω
8980TLS NTSC to HDTV Tri-level Sync Converter
Cabling
8900 module slots are interchangeable within the frame. The maximum
number of modules the frame will accept is ten. Figure 4 illustrates the rear
connector plate for an 8900 Series frame.
DA7
J1 J2
J2
O
J3 J4
J4
U
T
J5 J6
J6
J1 J2
J3 J4
J5 J6
J101
J102
J103
DA10
J1
O
J3
U
T
J5
DA9
J1 J2
J2
J2
O
J3 J4
J4
J4
U
T
J5 J6
J6
J6
DA8
J1 J2
O
J3 J4
U
T
J5 J6
TP3540-04
DA6
O
U
T
DA5
J1 J2
J2
O
J3 J4
J4
U
T
J5 J6
J6
DA4
J1 J2
O
J3 J4
U
T
J5 J6
DA3
J2
J1 J2
O
J4
J3 J4
U
T
J6
J5 J6
DA2
J1 J2
O
J3 J4
U
T
J5 J6
DA1
J1 J2
O
J3 J4
U
T
J5 J6
J7 J8
J9 J10
IN
J8
J9 J10
IN
J7 J8
Loopthrough Input
Outputs
J7 J8
J9 J10
IN
J7 J8
J8
J9 J10
IN
J7 J8
J9 J10
IN
J7 J8
J8
J9 J10
IN
J7 J8
J9 J10
IN
J8
J7 J8
J9 J10
IN
J7 J8
J9 J10
IN
J7 J8
J9 J10
IN
Figure 4. 8900 Series Frame Rear Connector
Connect an input source (NTSC reference color black) to one of the
loopthrough input connectors, J9 or J10 (See Figure 5). Terminate the
unused connector into 75
.
There are four duplicate outputs for the 8980TLS module—J1 through J4.
The destination equipment should have an input impedance of 75
unless
it has loopthrough inputs, in which case the loopthrough inputs must be
terminated into 75
J1
.
DAx
J2
J2
Active Outputs
J3
O
U
J4
J4
T
J6
J8
J6
J8
Not Used
0515_02
Loopthrough
J5
J7
J9 J10
IN
Input
Figure 5. Typical Module Input and Outputs
6 8980TLS Instruction Manual
Adjustments and Indicators
The 8980TLS output signal timing is adjusted relative to the input signal
using switches provided on the front panel (see Figure 6). The green LED
on the front of the module indicates the presence of an NTSC reference
input signal.
5
6
4
7
3
8
2
1
0
F
E
D
5
4
3
2
1
0
F
E
D
3.54 ms
9
A
increments
B
C
6
7
8
221 µs
9
A
increments
B
C
Adjustments and Indicators
5
6
4
7
3
8
2
1
0
F
E
D
5
4
3
2
1
0
F
E
D
5
4
3
2
1
0
F
E
D
13.5 µs
9
A
increments
B
C
6
7
8
864 ns
9
A
increments
B
C
6
7
8
54 ns
9
A
increments
B
C
Green LED indicates
0515_05
input signal present
Figure 6. Timing Adjustment Rotary Switches and Signal Present LED
To adjust the timing of the outputs relative to the input reference, use the
front panel switches (SW1 through SW5). There are five front panel
switches. SW1 is at the top and provides output timing control in 3.54 millisecond steps. SW2 provides 221 microsecond steps. SW3 provides 13.5
microsecond steps. SW4 provides 864 nanosecond steps and SW5 (bottom
switch) provides 54 nanosecond steps.
The timing of the output vertical interval first broad pulse will match the
timing of the input first broad pulse in 720P with the switches set to 4, B, 5,
E, and 0 (read from top to bottom). The vertical timing will match in 1080I
with the switches set to 4, B, 6, 8, and 9 (top to bottom again). This can be
observed by triggering an oscilloscope from the reference input vertical
interval and observing the output tri-level sync. The output timing is
8980TLS Instruction Manual 7
8980TLS NTSC to HDTV Tri-level Sync Converter
adjustable over a range of more than one frame. If the switch settings reach
00000 when adjusting the timing earlier, the desired output timing can be
adjusted later by one frame to reach the same point. The same will be true
if the timing is being adjusted later and the setting reaches FFFFF. In this
case the timing can be adjusted earlier by one frame to reach the same
point.
Service
The 8980TLS modules make extensive use of surface-mount technology
and programmed parts to achieve compact size and adherence to
demanding technical specifications. Circuit modules should not be serviced in the field.
If your module is not operating correctly, proceed as follows:
■
Check frame and module power and signal present LED
Ground
+5V
■
Check input signals
■
Check cables and connections
■
Verify that source equipment is operating correctly
■
Check output connections
Refer to Figure 7 for supply voltage test points that are located on the
8980TLS module.
1080I
720P
Figure 7. Voltage Test Point Locations
8980
0515_06
If the module is still not operating correctly, replace it with a known good
spare and return the faulty module to a designated Grass Valley repair
depot. Call your Grass Valley representative for depot location.
Refer to the
Contacting Grass Valley Group at the front of this document for
the Grass Valley Customer Service Information number.
8 8980TLS Instruction Manual
Index
A
adjustments
7
C
clock signal
color black
color burst
common mode
connectors
input
controller module
2
6
2
1
6
5
F
frame
5
H
HDTV standard
selection
high definition timing
horizontal timing
4
1
2
M
module
controller
installation
power supply
5
5
5
N
NTSC reference
6
O
outputs
connectors
line driver
specification
termination
timing adjustment 7
video standard 4
6
2
3
6
P
phase-locked loop 2
power supply 5
I
impedance
indicator
input
differential
loopthrough
signal present indicator
specification
6
7
1
6
7
3
J
jumper
video standards
8980TLS Instruction Manual Index-1
4
R
reference signal 2
required 1
repair depot 8
S
subcarrier frequency 2
T
termination 6
testpoints 8
timing switches 7
troubleshooting 8
V
video standard selection 4
Index-2 8980TLS Instruction Manual
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