ATI Technologies BU400B 운영 및 유지보수 매뉴얼 - 페이지 3

{카테고리_이름} ATI Technologies BU400B에 대한 운영 및 유지보수 매뉴얼을 온라인으로 검색하거나 PDF를 다운로드하세요. ATI Technologies BU400B 7 페이지. Ihf-pro interface amplifier

CIRCUIT DESCRIPTION

INPUT STAGES

The balanced input stages of the BU400 and BI100 utilize a FET input LF347 quad

op-amp 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 gains from both HI and LO inputs

allow unbalanced sources to be easily accommodated. Bridging impedance is a high

40Kohms with good CMR.

LEVEL CONTROLS

Each IHF and balanced output is controlled by its' own front panel potentiometer.

These controls are factory set for standard IHF level of -10dBu (.25V) and Pro level of

+4dBm.

LINE OUTPUT

Balanced output stages of the BI100 and UB400 utilize a unique active balanced

output driver IC, the SSM2142, which 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

will drive loads of 600 ohms and higher. Nominal output is +4dBm with clipping at

+22dBm into balanced loads. Maximum output at clipping is reduced by 6dB when

driving an unbalanced load, since the full output swing of only one driver is available.

POWER SUPPLY

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 permits several units to be daisy-chained with P/N20602-1 DC power cables

to a single WA100-1 power supply. The WA100 is a 400mA supply. The BI100 and

the UB400 each draw 70mA and the BU400 draws 40mA. Any combination, which

adds up to less than 400mA, can be powered by a single supply. They incorporate an

"artificial ground" power supply splitting circuit to track the DC input voltage and

provide a center point voltage reference for the audio stages.

Audio Technologies Inc.

154 Cooper Road #9021 West Berlin, NJ 080911 Voice 856-719-9900

Fax 856-719-99031 www.rzll)audio.com