ATI Technologies ADA208PH Operating instructions

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DaySequerra 7209 Browing Road Pennsauken, NJ 08109 [email protected] www.atiaudio.com

DISTRIBUTION AMPLIFIERS

OPERATING AND MAINTENANCE MANUAL

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DaySequerra 7209 Browing Road Pennsauken, NJ 08109 [email protected] www.atiaudio.com

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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DaySequerra 7209 Browing Road Pennsauken, NJ 08109 [email protected] www.atiaudio.com

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.

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