evertz exponent 500ADA-EQ-L User manual

Frame Manual
500ADA-EQ-L Equalizing Analog Video Distribution Amplifier
Revision 1.2
TABLE OF CONTENTS
1. OVERVIEW.........................................................................................................................................1
2. INSTALLATION..................................................................................................................................2
3. SPECIFICATIONS..............................................................................................................................3
3.1. ANALOG VIDEO INPUT............................................................................................................3
3.2. ANALOG VIDEO OUTPUTS.....................................................................................................3
3.3. ELECTRICAL ............................................................................................................................4
3.4. PHYSICAL.................................................................................................................................4
4. STATUS LEDS...................................................................................................................................5
5. CIRCUIT DESCRIPTION....................................................................................................................6
6. JUMPERS AND USER ADJUSTMENTS...........................................................................................7
6.1. SELECTING WHETHER LOCAL FAULTS WILL BE MONITORED
BY THE GLOBAL FRAME STATUS.........................................................................................7
6.2. SELECTING THE INPUT AC/DC COUPLING ..........................................................................7
6.3. DC RESTORING (CLAMP) OPERATION.................................................................................8
6.4. GAIN ADJUSTMENT.................................................................................................................8
6.5. CABLE EQUALIZATION OPERATION ....................................................................................9
6.6. LOW PASS FILTER SELECTION.............................................................................................9
Figures
Figure 1-1: 500ADA-EQ-L Block Diagram ..........................................................................................................1
Figure 2-1: 500ADA-EQ-L Rear Panel Overlay .................................................................................................2
Figure 6-1: LED and Jumper Locations ..............................................................................................................7

Frame Manual
500ADA-EQ-L Equalizing Analog Video Distribution Amplifier
Revision 1.2
REVISION HISTORY
REVISION DESCRIPTION DATE
1.0 Original Version Jul 06
1.1 Updated jumper diagram Nov 06
1.2 Fixed formatting and typos Jul 07

Frame Manual
500ADA-EQ-L Equalizing Analog Video Distribution Amplifier
Revision 1.2 500ADA-EQ-L - 1
1. OVERVIEW
The 500ADA-EQ-L Equalizing Analog Distribution Amplifier is a general purpose amplifier for distributing
analog video signals. The 500ADA-EQ-L features one looping (passive) balanced equalized input with
eight outputs. The 500ADA-EQ-L amplifier has been designed to distribute a wide range of analog video
signals. It can also distribute other pulses and signals that are less than 2Vp-p. The 500ADA-EQ-L has a
user-selectable Low Pass Filter with an 8MHz corner frequency to eliminate unwanted out of band high
frequencies.
The 500ADA-EQ-L is housed in the 500FR-L-A Frame that will hold up to 16 modules.
Features:
• Passive loop through built into frame
• High common mode range and common mode rejection ratio (CMRR)
• Gain control
• Jumper selectable AC or DC coupling
• Jumper selectable fast or slow back porch clamp
• DC level control when clamp is enabled
• Cable equalizer adjustment range: 0 to 300m of 8281 or 1694
• Consistent input impedance if card power is lost
• Signal and hardware integrity monitoring
• Over-voltage protection on 12V, +5V, 3.3V power rails
• Under-voltage protection on +5V, -5V and 3.3V power rails
AC/DC
Coupling
Balanced
Analog Loop
Thru Input
8
Analog
Outputs
Signal Analysis
Card
Status
75Ω
75Ω
75Ω
75Ω
75Ω
75Ω
75Ω
75Ω
Cable
EQ
DC Restore
Cable
Length
Sync
Slicer Clamp Pulse
Generation
Clamp
On/Off
GainDC Level
Low Pass
Filter
VistaLINK®
Interface
Figure 1-1: 500ADA-EQ-L Block Diagram

Frame Manual
500ADA-EQ-L Equalizing Analog Video Distribution Amplifier
500ADA-EQ-L - 2 Revision 1.2
2. INSTALLATION
The 500ADA-EQ-L comes with a companion rear panel overlay that can be placed over the rear panel
BNC connectors to identify their function. For information on inserting the module into the frame see
section 3 of the 500FR chapter.
Figure 2-1: 500ADA-EQ-L Rear Panel Overlay
IN Input (isolated) BNC looping connectors for analog video signals. The INPUT jumper located
on the module near the back determines whether the input signal will be AC or DC coupled.
(See section 6.2)
OUT 1 to 8 There are eight BNC connectors with equalized, filtered DC level adjusted copies of the
input signal.

Frame Manual
500ADA-EQ-L Equalizing Analog Video Distribution Amplifier
Revision 1.2 500ADA-EQ-L - 3
3. SPECIFICATIONS
Note: At the time of printing, this product has only been qualified for use with standard definition signals. It,
however, has been designed to work with high definition signals. Frequency, phase response as well as
cable equalization will not be optimized at the upper frequency range of high definition video bandwidths.
All specifications, unless indicated, measured under the following conditions unless otherwise noted:
• 1 Vp-p video applied
• 75 Ohm terminated
• DC coupled
• DC restore clamp turned on with slow time constant
• DC level adjusted for blanking at 0V
• Gain adjusted for unity operation into 75 Ohm load
• Cable equalizer set to 0 length
3.1. ANALOG VIDEO INPUT
Standards: Any analog video format, up to 2Vp-p and 30MHz bandwidth
Connector: 1 BNC input per IEC 169-8
Common mode range: >6Vp-p
CMRR: >70dB to 1kHz
Signal amplitude: 2.5Vp-p max
Cable equalizer: 0 to 300m of Belden 8281 or 1694 cable
Impedance: 35 kOhms Hi-Z
Coupling: AC or DC (jumper selectable)
Sigle Card Return loss1: >25dB to 5.5MHz
Clamp range: >+/- 600mV
Fast clamp attenuation of 60Hz: >36dB
3.2. ANALOG VIDEO OUTPUTS
Number of Outputs: 8 Per Card
Connector: BNC per IEC 169-8
Output impedance: 75 Ohm
Gain control range: ± 5dB
DC level < +/- 100mV (with DC Coupling active and back porch clamp disabled)
DC level Control range: < +/- 200mV(with back porch clamp enabled)
Sigle Card Freq. Response2:
 LPF OUT:
< ±0.05dB no equalization (to 8MHz)
< ±0.09dB for 5 to 100m Belden 8281 or 1694 (to 8Mhz)
< ±0.15dB for 100 to 300m Belden 8281 or 1694 (to 8Mhz)
 LPF IN:
< ±0.15dB for 0 m to 300m Belden 8281 or 1694 (to 8MHz)
Corner frequency (< -3dB) at 13MHz
Differential Gain: <0.17 % 0 to 300m
Differential Phase: < 0.19 deg 0 to 300m
1De-rate specs. When looping through multiple 500FR-L-A inputs.
2De-rate spec. by approx. 0.05dB per additional loop-through of other 500FR-L-A inputs.

Frame Manual
500ADA-EQ-L Equalizing Analog Video Distribution Amplifier
500ADA-EQ-L - 4 Revision 1.2
C/L gain inequality: <+/-0.1% for all cable lengths
C/L Delay:
 LPF OUT:
<+/-2nsec
 LPF IN:
<+/-3nsec
Output isolation: >42dB to 10MHz, >32 dB to 30MHz
Output return loss: >40dB to 30MHz
Noise performance: <-78dB RMS NTC7 weighting,
<-70dB RMS 15kHz to 5.5MHz
3.3. ELECTRICAL
Voltage: + 12VDC
Power: 1.2 Watts.
3.4. PHYSICAL
Number of slots: 1

Frame Manual
500ADA-EQ-L Equalizing Analog Video Distribution Amplifier
Revision 1.2 500ADA-EQ-L - 5
4. STATUS LEDS
The 500ADA-EQ-L has seven LED Status indicators on the front card edge to show operational status of
the card at a glance. Figure 6-1 shows the location of the LEDs.
Two large LEDs on the front of the board indicate the general health of the module
LOCAL FAULT: This Red LED indicates poor module health and will be On during the absence of a
valid input signal, or if a local input power fault exists (i.e.: a blown fuse). The
LOCAL FAULT indication can also be reported to the frame through the FRAME
STATUS jumper.
MODULE OK: This Green LED indicates good module health. It will be On when a valid input
signal is present, and the board power is good.
There are five small LEDs that indicate the status of the input video.
SD/HD Video Presence Indicators: The width of sync is measured to determine if video is present and if
it is NTSC/PAL-B or if it is analog high definition video. If sync is approximately 4.7µsec wide,
the green SD PRES LED is illuminated. If sync is approximately 0.6µsec wide, the green
HD PRES LED is illuminated. If neither sync size is present, both LEDs are turned off.
This technique will also successfully detect HD signals with bi-level sync generated by Evertz
DACs for applications with computer monitors. Other manufacturers DACs may not have the
same sync size so the detection may not work with these signals.
Sync High/Low Indicators: The sync level of the processed video is measured to determine if its
amplitude is approximately correct. If sync is below 270mV then the amber SYNC LOW LED is
turned on and if sync is above 320mV then the amber SYNC HIGH LED is turned on. This
measurement takes place AFTER all of the card processing. This means that if the card is not
calibrated properly, the indicators will not represent the proper state of the video. This includes
improper setting of restored DC level, poorly equalized video and wrong gain settings.
!
These indicators will NOT indicate properly when the input video is AC coupled
and the DC restore clamp is turned off.
Video High Indicator: The level of the processed video is measured to determine if its amplitude is
approaching the 100% level. If in one field, the video is ever above 700mV then the amber
VIDEO HIGH LED is turned on for a short duration. If the video is consistently too "hot", then
the light will always be on. This measurement takes place AFTER all of the card processing.
This means that if the card is not calibrated properly, the indicator will not represent the proper
state of the video. This includes improper setting of restored DC level, poorly equalized video
and wrong gain settings.
!
These indicators will NOT indicate properly when the input video is AC coupled
and the DC restore clamp is turned off.

Frame Manual
500ADA-EQ-L Equalizing Analog Video Distribution Amplifier
500ADA-EQ-L - 6 Revision 1.2
5. CIRCUIT DESCRIPTION
The input signal enters the board through looping BNCs with isolated ground so that balanced input
processing may be done to remove any common mode hum that may have been added to the signal and
ground shield. On-board jumpers allow you to configure the input impedance and input coupling (AC/DC).
For video applications, the synchronization pulses are analyzed for position and size information. A clamp
pulse is generated from the sync information and a clamp signal is delivered to a DC restorer circuit that
positions the blanking level to ground. This feature can be enabled with a jumper, the time-constant of the
clamping action may be fast or slow and the DC level may be set with a card edge POT.
An adjustable gain stage feeds the cable equalizer that can adjust the frequency response to match the
attenuation of up to 300m of coaxial cable. One OP-Amp drives the eight output BNC's with 75-Ohm
output impedance.
The digital power supply is separated from the analog power supply. In the case of a failure in the analog
power supply, the digital circuitry can report the fault to the global frame status bus and to the frame
controller card.
The power supply monitoring circuitry monitors the over-voltage conditions on 3.3V, 5 V and 12V power
supplies and under-voltage condition on 3.3V, 5V, and -5V power supplier. When an over-voltage or
under-voltage condition is detected, the local fault indicator will be turned on.
Over-voltage
Threshold Under-voltage Threshold
12V 15.2V N/A
5V 6.2V 3.6V
-5V N/A -3.3V
3V 4.1V 2V

Frame Manual
500ADA-EQ-L Equalizing Analog Video Distribution Amplifier
Revision 1.2 500ADA-EQ-L - 7
6. JUMPERS AND USER ADJUSTMENTS
J1 FRAME STATUS
ON
OFF +12V GND
GAIN
EQ CTRL
CLAMP LEVEL
MODULE STATUS
(A)500ADA-EQ-L
HD PRES
SD PRES
VIDEO HIGH
SYNC HIGH
SYNC LOW
J8 FASTSLOW CLAMP
J3 OFFON CLAMP
J6 16948281 CABLE
J4DC
AC
INPUT
LPF
OUT
IN
J9
Figure 6-1: LED and Jumper Locations
6.1. SELECTING WHETHER LOCAL FAULTS WILL BE MONITORED
BY THE GLOBAL FRAME STATUS
The FRAME STATUS jumper J1, located at the front of the module determines whether local faults (as
shown by the Local Fault indicator) will be connected to the 500FR-L-A frame's global status bus.
FRAME STATUS: To monitor faults on this module with the frame status indicators (on the power
supply’s FRAME STATUS LED's and on the Frame's Fault Tally output) install this
jumper in the On position.
When this jumper is installed in the Off position local faults on this module will not
be monitored.
6.2. SELECTING THE INPUT AC/DC COUPLING
The input may be AC or DC (default) coupled into the input-circuitry using jumper J4. Use AC coupling in
applications when the input signal has a large (>2V) DC level. In some non-video applications that do not
have DC information (i.e. digital AES audio), AC coupling can be used to remove any DC level that may
have built up in its transmission. The DC Restoring (clamp) circuitry will work with either AC or DC
coupling in video applications.

Frame Manual
500ADA-EQ-L Equalizing Analog Video Distribution Amplifier
500ADA-EQ-L - 8 Revision 1.2
6.3. DC RESTORING (CLAMP) OPERATION
A clamp pulse is generated from the sync information and a clamp signal is delivered to a DC restorer
circuit that positions the blanking level to ground. This feature will work with standard definition analog
NTSC and PAL-B sync structures. Analog tri-level sync 1125-line high definition video (SMPTE 240M) will
also be detected and DC restored. In addition, most versions of bi-level sync that has been applied to
1125-line high definition video will be supported.
!
The clamp position and size will successfully DC restore HD signals with bi-level
sync generated by Evertz DACs for applications with computer monitors. Other
manufacturers DACs may not have the same sync size and the DC restoring may
not work with these signals.
The clamp action can be enabled with a jumper, the time-constant of the clamping action may be fast or
slow and the DC level may be set with a card edge POT. For non-video applications disable the clamp
with the jumper (J3). For removing low frequency distortions (<1kHz) from clean video, use the clamp
time-constant (J8) in the FAST position. If the video has a sizeable amount of noise (i.e. a low quality off-
air signal) the fast clamp will generate a line-to-line level distortion (also called "piano-keying") because of
the noise. In this situation, use the SLOW clamp position of (J8). The CLAMP LEVEL POT on the card
front edge allows you to adjust the DC level that the back porch is being clamped to. This allows you to set
the output DC level to values other than back porch to ground.
!
Do NOT turn on the clamp when distributing Pb and Pr signals. Standard
Definition and High Definition component Pb and Pr signals have waveforms that
extend below blanking level. The right level and duration of a negative going
video signal may be interpreted as a sync signal, enabling a clamp pulse in active
video. This will cause the DC restorer circuit to distort the video, creating a large
Average Picture Level (APL) change.
6.4. GAIN ADJUSTMENT
The GAIN POT on the cards front edge allows you to adjust the input signal level. Turning the POT
clockwise will increase the gain.
!
There is enough range on this control to counteract the video level error due to a
missing or double terminated coaxial connection. This will create a frequency
response problem due to the mis-termination.
TIP: Set the DC LEVEL before adjusting the gain. The Gain control amplifies the signal around ground.
By setting the back porch to ground first, you may avoid re-adjusting the gain.