ATI Technologies ADA208PH Operating instructions

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DISTRIBUTION AMPLIFIERS
OPERATING AND MAINTENANCE MANUAL
© Copyright 2018, ATI is a registered trademark of DaySequerra Corp.

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PRODUCT DESCRIPTION
The ADA208PH or ADA416PH provides two (208) or four (416) independent one-in by four-out
circuit groups. A four-output feed is sufficient for many applications; however, if you need more
outputs, you can parallel channels by bridging several inputs across the same line for 1X8, 2X8
or 1X16 operation. Since each input circuit has 30k ohms balanced input impedance, you can
simply terminate your source line with a single 620 ohm resistor (if necessary) and then parallel
as many inputs as necessary across it.
Each input can bridge line levels up to +24dBm without clipping. Common mode hum signals
are attenuated by 70dB and the input resistor network is split and heavily bypassed for good
protection from RF signals riding on the input lines. The input differential amplifier operates at
slightly less than unity gain to optimize input headroom and to prevent any signal clipping from
occurring prior to the gain controls.
Each output consists of an adjustable gain stage driving the HI output terminal along with a
unity gain inverter stage. The inverter drives the LO output in opposite phase to provide an
active balanced output. The adjustable gain stage utilizes a unique circuit arrangement that
allows us to provide a smooth, full range logarithmic gain control for each output using a linear
cermet potentiometer. This circuit provides 20dB gain at full clockwiserotation, unity gain in the
12 o'clock position and tapers smoothly to full off at the fullCCW position. Since we actually
vary the gain of the output stage rather than taking the more conventional approach of
adjusting the input level to a fixed gain stage, you can use the ADA at low output levels with
very little noise penalty. You can easily match the ADA outputs to console medium level inputs
(-20dBm) or drive semi-pro RCA inputs (single ended at .10Vrms) without requiring outboard
attenuator pads.
Each balanced output stage is isolated from the output terminals by DC blocking capacitors
and 400 ohms of build-out resistance. The build-out resistors are split and bypassed to prevent
any RF signals that might be picked up on an output line from feeding back into the ADA.

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The ADA has clipping indicators to warn you of overdriven and overloaded outputs. These
indicators individually sense nonlinear operation of any output channel by measuring the error
voltage at the feedback terminal of the HI side output amplifier. If any single output or any
combinations of outputs are driven too high, they will light the clipping LED. Each clipping
indicator monitors only four outputs, making it easy to locate the "hot" output.
The ADA operates from a 15W – 24VDC single output switching supply featuring universal
AC input. Operating in the range of 85 – 264 VAC / 120 – 370 VDC, it offers low ripple and
noise at a max 150mV peak to peak.

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INSTALLATION
The ADA Series Distribution Amplifier is designed for rack mounting on standard E.I.A. 1-3/4
inch centers. Each unit dissipates approximately 10 watts and is ventilated through slots in the
rear panel.
WIRING
There are three wire grounded plugs. The power line ground could cause a loop with your
studio ground. If you are sure your studio ground will provide adequate protection to personnel
in case of an AC line short to chassis, a 3-to-2 AC adapter can be used to isolate the power line
ground. We recommend that the adapter be removed and the power line ground be reconnected
prior to any service work requiring removal of the studio ground from the chassis.
To allow maximum flexibility in grounding in high RF environments, the ADA circuit grounds are
isolated from case ground. For normal operation, add a ground jumper from any Phoenix
connector ground terminal to the chassis ground screw.
The four inch silver bearing low inductance copper strap which you are, of course, using for your
studio ground is not going to fit around the #6 chassis ground screw on the amplifier rear panel.
Run the strap to within a few inches of the chassis and jump to the chassis ground screw with
shield braid.
We have taken serious measures to keep RF out of your ADA. This includes split and
bypassed input and output resistor networks, beaded, bypassed and isolated power inputs,
non-concentric wound power transformers and double ground plane PC boards. However, in a
difficult broadcast application, any RF shielding and suppression system is going to be no better
than the ground system into which it is trying to dump the unwanted RF. For optimal product
performance, be sure to have a good facility grounding system.
Audio inputs and outputs should be connected using the rear panel labels as a guide. HI
outputs are all in phase with each other and in phase with the HI inputs.

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Phoenix Terminal Pinout

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CAUTION
The Distribution Amplifier has active drivers for both HI and LO output terminals. DO NOT
GROUND either HI or LO terminals. If you are driving a single-ended (unbalanced, one side
grounded) high impedance or 600 ohm load, it should be connected between either HI to
GND or LO to GND. If you are driving a balanced load, connect it between HI and LO output
terminals. It is generally unnecessary to terminate the ADA with a 600 ohm load if it is driving
a high impedance input, although placing a terminating resistor across a hi-Z input at the
receiving end will occasionally reduce RF pickup.
ADJUSTMENTS
It is sometimes difficult to maintain good noise performance when using a ADA to drive medium
level console (-20dBm) or IHF (.1V) equipment inputs. You may have found it necessary in the
past to insert attenuator networks between a ADA and medium level console inputs to allow the
ADA to operate at a high enough output level to maintain a good signal-to-noise ratio. The ADA
will reduce its already low output noise still further as you turn down its gain. In the absence of
high RF fields, you can distribute input signals as low as -20dBm to multiple loads at 0 to
-20dBm levels.

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PRODUCT SPECIFICATIONS
OUTPUT LEVEL: +24dBm into 600 ohm balanced loads
THD: .001% typical, 20Hz to 20kHz
IMD: .05% maximum, SMPTE measurement
SLEW RATE: 13 Volts per microsecond
RESPONSE: +/-. 25dB, 30Hz to 20kHz
NOISE: -100dBm EIN 20Hz to 20kHz
GAIN: 20dB maximum; each output has 40dB smooth adjustment range going to full off
CROSSTALK: 70dB minimum at 1kHz
OUTPUT IMPEDANCE: 400 ohms balanced, 200 ohms single-ended, split and RF
bypassed, AC coupled
INPUTS: 30K ohm active balanced, split and RF bypassed; +22dBm maximum input level
HUM REJECTION: 70dB CMR at 60Hz
POWER: Input 85-264 VAC ±1%, Output Voltage 24 VDC, Ouput Power 15 W, 47 - 63Hz
frequency range.
SIZE: 19" (48.3cm) W x 1-3/4" (4.4cm) H x 7-1/2" (19.1cm) D
SHIPPING WEIGHT & DIMENSION: 12 pounds (5.5kg), 22”x12”x5”
TERMINALS: Euro style modular connectors

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ADA208PH
ADA416PH

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ONE YEAR LIMITED WARRANTY
ATI warrants this product to be free from defects in materials and workmanship to its original
owner for a period of one year from date of purchase. ATI will repair or replace such product
or part thereof, which upon inspection by ATI, is found to be defective in materials or
workmanship.
The Proper Return Authorization Number must be obtained from ATI in advance of return.
Contact ATI at 856-719-9900 or email [email protected] to receive the number and
instructions for return of your unit.
A written statement providing the name, address, daytime telephone number and email address
of the original owner, together with receipt from the original purchase, and a brief description
of any claimed defects, must accompany all returns. Parts or product for which replacement is
made shall become the property of ATI.
The customer shall be responsible for costs of transportation and insurance to the factory of
ATI, and shall be required to prepay such costs.
ATI shall use reasonable efforts to repair or replace any product covered by this limited
warranty within thirty days of receipt. In the event repair or replacement shall require more than
thirty days, ATI shall notify the customer accordingly. ATI reserves the right to replace any
product that has been discontinued from its product line with a new product of comparable
value and function.
This warranty shall be void in the event a covered product has been damaged, or failure is
caused by or attributable to acts of God, abuse, accident, misuse, improper or abnormal usage,
failure to follow instructions, improper installation or maintenance, alteration, or lightning, power
fluctuations and other incidental or environmental conditions. Further, product malfunction or
deterioration due to normal wear is not covered by this warranty.

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ATI DISCLAIMS ANY WARRANTIES, EXPRESS OR IMPLIED, WHETHER OF
MERCHANTABILITY OF FITNESS FOR A PARTICULAR USE, EXCEPT AS EXPRESSLY
SET FORTH HEREIN. THE SOLE OBLIGATION OF ATI UNDER THIS LIMITED WARRANTY
SHALL BE TO REPAIR OR REPLACE THE COVERED PRODUCT, IN ACCORDANCE WITH
THE TERMS SET FORTH HEREIN. ATI EXPRESSLY DISCLAIMS ANY LOST PROFITS,
GENERAL, SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES WHICH MAY RESULT
FROM BREACH OF ANY WARRANTY, OR ARISING OUT OF THE USE OR INABILITY TO
USE ANY ATI PRODUCT.
Some states do not allow the exclusion or limitation of incidental or consequential damages or
limitation on how long an implied warranty lasts, so the above limitations and exclusions may
not apply to you.
This warranty gives you specific legal rights, and you may also have other rights that vary from
state to state.
ATI reserves the right to modify or discontinue, without prior notice to you, any model or style
product.
If warranty problems arise, or if you need assistance in using your product contact us.