ATI Technologies L200 Operating instructions

L200

LINE/SUM/MIKE AMPLIFIER

OPERATING AND MAINTENANCE MANUAL

DESCRIPTION

Your L200 Dual Line/Buffer Amplifier is an inexpensive, high performance

amplifier, which is ideal as a gain block, attenuator, impedance converter,

summing amplifier and signal splitter.

The inputs provide balanced 40Kohm bridging impedance for line levels up to

+24dBm. The high input impedance allows the L200 input to also bridge -10dBu

(hi-fi, RCA plug) lines without loading.

Front panel, screwdriver adjust, full range gain controls provide 26dB gain at full

clockwise rotation, unity gain at twelve o’clock and a smooth audio taper to full

off.

The output drivers are servo controlled, ground-sensing circuits, which will supply

over +22dBm to 600 ohm balanced loads and +20dBu to high impedance,

unbalanced loads. The L200 uses rugged XLR type input and output connectors.

Loop-through DC connectors allow several NANOAMPS to share a single

external 24VDC power supply. Battery packs and DC-DC converters for portable

use are also available.

Up to three NANOAMPS will mount side-by-side in only one rack unit using the

available rack mounting kits. Your L200 may also be neatly stacked or mounted

side by- side on your desk with the available angled desk mounting kits.

CIRCUIT DESCRIPTION

INPUT STAGES

The balanced input stages of the L200 Line Amplifier utilize a FET input LF347

quad opamp in a clean, quiet inverting instrumentation amplifier configuration.

Input levels up to +24dBm will be handled without clipping, excess levels cause

only clean clipping without hang-up or phase reversal. Equal -6dB gains from

both HI and LO inputs allow unbalanced sources to be easily accommodated.

Bridging impedance is a high 40Kohms with good CMR.

GAIN STAGES

A low noise NE5532 provides 26dB maximum gain. Inexpensive linear controls

are used in a unique circuit configuration to provide a logarithmic gain control

characteristic in a variable gain stage with optimum noise performance. Output

noise at unity gain is low enough to allow performance to exceed 16-bit digital

dynamic range even at -10dBu nominal output.

LINE OUTPUT

Balanced output stages of the L200 utilize a unique active balanced output driver

IC, the Analog Devices SSM2142, that senses whether the connected load is

balanced and floating or is unbalanced due to either side being grounded. A

balanced output load will be driven with equal and antiphase levels on the HI and

LO output lines. An unbalanced (one side grounded) load will cause the driver IC

to shut off the signal output to the grounded side of the load and double the

output level applied to the other side, thus maintaining equal output to either type

of load. The output stage provides 6dB gain and will drive loads of 600 ohms and

higher. Nominal output is +4dBm with clipping at +22dBm (10Vrms) into 600 ohm

balanced loads for 18dB nominal headroom. Maximum output is reduced to

+20dBu (7.8Vrms) when driving an unbalanced load since the full output swing of

only one driver is available. This still provides a very comfortable 30dB of

headroom above the typical -10dBu nominal unbalanced signal.

POWER SUPPLY

The L200 requires 22 to 30VDC and are designed to share a common external

24VDC "Wall Wart" type power supply. A pair of loop-thru DC connectors on the

rear of each module permit several units to be daisy-chained with P/N20602-1

DC power cables to a single power supply. The WA100-1 and WA100-2

(230VAC) are 400mA supplies. The L200 draws 70mA. Any combination of

which add up to less than the supply rating can be powered by a single supply.

INSTALLATION

UNPACKING

Inspect the equipment. If there is any visible damage to the unit or to the box it

came in, contact the factory but do not return anything to ATI without prior

authorization and shipping instructions. It may be necessary to have the shipping

company inspect the unit and the box at your location. Count the pieces! Don't

throw out the boxes and packing material until you are sure you have everything

that is coming to you. They need either their own separately ordered WA100

power supply or a DC cable, P/N20602-1 to share the supply of another.

Rack and desk mounting hardware may be packed in with the unit even though

ordered separately. Wall mount power supplies must be ordered separately but

may either be included with the unit or shipped in their own box.

MOUNTING

Single desk mounting kits consist of a pair of angled base plates that mount

under the lower front and rear cover screws of a single unit, to raise and to tilt it

for easy use. In addition, one or more sets of vertical stacking plates, mounting to

the upper front and rear cover screws of the bottom unit, allow multiple units to

be stacked. Several units can be desk mounted side-by-side and even stacked

side-by-side using horizontal joiner kits together with mounting base and stacker

kits. P/N20617-501 is the angled base kit. P/N20617-502 is the base plus one

stacker kit (two high). P/N20617-503 is the base plus two stackers (three high).

P/N20617-504 is the stacker kit by itself and P/N20604-504 is a horizontal joiner

kit. Rack mount system 21075-501 mounts three units in one rack

WIRING

AUDIO CONNECTIONS

Balanced XLR type inputs and outputs are wired per figure 1 with pins 2 as HI

and pins 3 as LOW. Pin 1 is the cable shield and ground connection. Pin 1 is

grounded as shipped but may be floated to interrupt a hum producing ground

loop by opening the unit and clipping out the GND LIFT jumpers. Unbalanced

lines use pin 2 as HI and ground pins 3 and 1. Active balanced outputs and

inputs require a reference ground connection to the source or receiving device

for proper operation. This ground can be provided by the rack frame or a studio

buss connection if it is not carried through by the output cable shield.

GROUNDING

Operation in high RF broadcast environments requires special attention to

grounding and shielding. The chassis must be grounded directly to a good, low

impedance studio ground system. Input and output connections must be properly

shielded and free of ground loops. It may even be necessary to add shielding to

the DC input leads to avoid RF pickup.

POWER DISTRIBUTION

Multiple amplifiers sharing a single wall-wart power supply should be looped

through each other using the DC interconnect cables P/N20602-1. Hum and

noise performance of the units can be degraded by poor DC ground connections

between units sharing a common supply, use of the recommended rack and desk

mounting kits will assure a good ground connection between units by firmly

strapping their chassis together. CAUTION! The outer shell of the DC

interconnect cables is positive relative to the chassis. Do not allow a DC cable

plugged into a powered unit to hang loose where it might short against the

chassis or rack frame.

OPTIONS

230VAC

The WA100-2 tabletop power supply accepts 230VAC/50-60Hz via an IEC320

male 3 pin AC input connector. User supplies a matching line cord for the local

power system.

Battery Operation

Alkaline battery packs (BBU100-1) and 24VDC converters for operation from 12V

belt pack or automotive batteries (DC100-1) power modules are available.

MAINTENANCE

There is no routine maintenance required by your amplifier. If you have a

problem, check panel LED indicators to assure that the units have DC power,

eliminate by substitution input and output cables, connectors, downstream

devices, DC interconnect cables and Wall Wart power supplies.

POWER SUPPLY LEVELS

The recommended loaded DC input voltage range is 22VDC minimum to 32VDC

maximum over the full range of AC line voltage tolerances. The audio circuits

continue to work with reduced headroom below 22VDC. Momentary surges up to

36VDC will cause some increased internal heating, but above 36VDC may cause

IC failure.

OPERATING POINTS

An internal reference voltage equal to 1/2 the supply voltage is generated. All

audio stage IC inputs and outputs should show a DC level equal to this voltage

when measured with a high impedance meter. Audio inputs and outputs are

capacitor coupled and ground referenced.

MODIFICATIONS

If more gain is required for a particular application increase the values of R25

(left) and R34 (right). 20K ohms adds 6dB, 30K ohms adds 10dB, 62K adds

16dB, 100K adds 20dB. A corresponding decrease in the input clipping level will

result. SUMMING AMPLIFIER if you wish to sum the inputs, remove the cover

and find the jumper plug J4. Move J4 from the parked position so that it jumps

both terminal pins. Either input signal will now appear at both outputs at a level

as set by the individual input gain control. The summing network causes 6dB of

loss however the two inputs sum to +3dB (+6dB for in phase sine waves).

PERFORMANCE SPECIFICATIONS

GAIN: 28dB maximum, 0dB at 12 o’clock pot position

NOMINAL LEVELS: +4dBu in, +4dBm out to 600 ohm balanced load

PEAK LEVELS: +24dBu in, +22 dBm out to 600 ohm balanced load

NOISE 20kHz B.W.: -90dBm maximum output

HARMONIC DIST.: .02% Max at Peak Level

20Hz to 20 kHz .005% max at Nominal Level

FREQUENCY RESP.: +.25dB, 20 to 20,000Hz

CROSSTALK: 70dB minimum at 10kHz

INPUT IMPEDANCE: Balanced, 40kohm bridging

OUTPUT IMPEDANCE: Balanced, 40 ohms maximum Zs

DIMMENSIONS: 1.5"H by 5.5"W by 5.75"D; Weight: 1.5 Lb. Net

CONNECTORS: XLR (balanced input/outputs)

POWER: 24VDC @ .07A, connector sleeve is positive.

POWER SUPPLIES: All units require 24VDC power supply, which is

ordered separately. Amplifiers can share a single

supply-using loop thru DC cable (P/N 20602-1). Do

not exceed rated supply current

WA100-1: Wall mount power supply (UL), 24VDC @ .4 amp,

115 VAC/60 Hz

WA100-2: Tabletop power supply, 24VDC @ .4 amp, 230

VAC/50-60 Hz with IEC 320 male 3 pin AC input

connector. User supplies matching AC line cord for

local power system

BBU100-1: Battery Pack unit houses four 9V alkaline batteries

(batteries not included). 4 to 6 hour life

DC100-1: DC to DC converter powers several units from

12VDC mobile and belt pack batteries. Supplies

24VDC @ .2amp maximum

20602-1: DC power cable assembly for looping the DC

power between

DESK MOUNT KITS: 20617-501 Angled Desk Mount Base

20617-502 Angled Desk Mount Base and One

Stacker (2 units high)

20617-503 Angled Desk Mount Base and Two

Stackers (3 units high)

20617-504 Stacker (2 units high)

20604-504 Horizontal Joiner (2 units side-by-side)

RACK MOUNT KITS: 21075-501 Rack mount system

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