RJM ADA-101 User manual

RJM & Associates, LLC
175 Joerschke Drive, Suite A
Grass Valley, CA 95945
Phone: [phone] Fax: [phone]
info@rjmandassociates
www.rjmandassociates.com
ADA-101
Analog Audio
Distribution Amplifier

Statement of Warranty
Statement of WarrantyStatement of Warranty
Statement of Warranty
RJM & Associates, LLC warrants its products for a period of three (3) years from
the date of shipment to e free from defects in materials and workmanship and
meets applica le pu lished specifications. Equipment which has een operated
within its ratings and has not een su jected to mechanical or other a use or
modification y the purchaser, its agents, and/or employees, will, at the option of
RJM, e replaced or repaired if it is returned, freight prepaid, to RJM &
Associates, LLC. Equipment that fails under conditions other than descri ed
herein will e repaired at the price of components and la or in affect at the time
of repair.
This warranty is in lieu of all other warranties, expressed or implied, with respect
to the condition or performance of any RJM product, its merchanta ility or fitness
for a particular purpose. RJM is not lia le for any consequential damages.
FCC Compliance
FCC ComplianceFCC Compliance
FCC Compliance
This equipment has een tested and found to comply with the limits for a Class A
digital device pursuant to Part 15 of the FCC Rules. These limits are designed to
provide reasona le protection against harmful interference when the equipment
is operated in a commercial environment. This equipment generates, uses, and
can radiate radio frequency energy and, if not installed and used in accordance
with the instruction manual, may cause harmful interference to radio
communications. Operation of this equipment in a residential area is likely to
cause harmful interference in which case the user will e required to correct the
interference at his own expense.
Copyright
CopyrightCopyright
Copyright
© 2014 RJM & Associates, LLC
Contents of this pu lication may not e reproduced in any form without the
written permission of RJM. Reproduction or reverse engineering of copyrighted
software is prohi ited.
July 2014
Part Num er 71
7171
71-
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Table of Contents
Table of ContentsTable of Contents
Table of Contents
Section I
Section ISection I
Section I
General Description ................................................................................................ 1
Section II
Section IISection II
Section II
Specifications .......................................................................................................... 2
Section III
Section IIISection III
Section III
Installation ............................................................................................................... 3
Section IV
Section IVSection IV
Section IV
Circuit Description ................................................................................................... 4
Section V
Section VSection V
Section V
Diagrams ................................................................................................................. 5
Mo ule Schematics ........................................................................................... 6

SECTION I
SECTION ISECTION I
SECTION I
ADA
ADAADA
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General Description
General DescriptionGeneral Description
General Description
The ADA-101 is a modular, high per ormance audio distribution ampli ier
intended or studio quality audio distribution systems. It is designed to be
operated rom the RJM AMF-100 mounting rame, or it is pin-compatible with the
Leitch* FR-883/884 audio mounting rames.
The module can be con igured as a one-input by eight-output monaural, or as
two, one-input by our-output stereo ampli iers, just by moving one internal
jumper. In the MONO mode only the Channel A input connector is used. The
Channel B input is le t unconnected.
All inputs can be connected balanced or unbalanced. Outputs are always
balanced. Both preset and variable gain controls are available which will provide
a gain range o -6 to +33dB.
Each module has its own on-board voltage regulators with use protection. Any
ailure o a single module will not a ect any other.
*Leitch is a trademark o Leitch Technology International, Inc.

2
SECTION II
SECTION IISECTION II
SECTION II
ADA
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Speci ications
Speci icationsSpeci ications
Speci ications
Input:
Input:Input:
Input:
Number 2, Channel A and Channel B, (Channel A
used or mono)
Type Di erential
Impedance >30KΩ balanced, >12KΩ unbalanced
Maximum level
+30dBu (66Ω), +24dBm (600Ω)
Common Mode Rejection, (CMRR)
>90dB @60Hz, >60dB @20KHz
Common Mode Range
±20volts
Outputs:
Outputs: Outputs:
Outputs:
Channels 1 (mono) or 2 (stereo)
Outputs per channel
4 balanced stereo
8 balanced monaural
Impedance 66Ω balanced or 600Ω balanced
Maximum Level
+30dBu (66Ω), balanced
+24dBm (600Ω), balanced
Per ormance:
Per ormance:Per ormance:
Per ormance:
(each channel)
Gain range
-6dB to +33dB (± 6dB with pot, and
0, +9, +18, +27dB with jumpers)
Frequency Response
±0.05dB, 20Hz to 20KHz, re . 1KHz any
level up to +30dBu (66Ω),
+24dBm (600Ω)
Total Harmonic Distortion, (THD)
<0.05%, 20Hz to 20KHz @ 30dBu,
+24dBm (600Ω)
Intermodulation Distortion, (IMD)
<0.02% 4:1 SMPTE @18dBu (66Ω),
+18dBm (600Ω)
Isolation between Modules
>100dB, 20Hz – 20KHz
Interchannel Crosstalk
>95dB, 20Hz – 20KHz
Power Dissipation
<2W
* Speci ications and design are subject to change without notice.

3
SECTION III
SECTION IIISECTION III
SECTION III
ADA
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Installation and Operation
Installation and Operation Installation and Operation
Installation and Operation
The ADA-101 audio distribution ampli ier is designed to be mounted in either the
RJM AMF-100 audio mounting rame, (up to twelve modules), or a Leitch* audio
rame (such as the FR-883 or FR-884). There are no special cooling
requirements, although care should be taken to ensure that extremely hot
equipment is not installed directly beneath the rame.
It is recommended that when redundant power supplies are included in the
rame, the two power cords be connected to di erent AC supplies. In this way the
rame will continue to operate even i there is a partial ailure o plant power.
Be ore installing the module in the rame, it is necessary to set the internal
jumpers to the desired mode. Jumper H2 selects either MONO or STEREO
mode, and jumpers H1 and H3 set the desired gain o each channel.
The rame input and output connections are similar or both the RJM and the
Leitch* rames. They consist o three-pin terminal blocks as de ined below:
CH A
CH ACH A
CH A CH B
CH BCH B
CH B
INPUTS - +
S S
+ -
J2 J1
J4 J3
OUTPUTS - +
S S
+ -

4
SECTION IV
SECTION IVSECTION IV
SECTION IV
ADA
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Circuit Description
Circuit DescriptionCircuit Description
Circuit Description
The ADA-101 consists o two identical input circuits and two identical groups o
our output circuits. A jumper (H2) permits the two output channels to be both
connected to one input channel or use as a one input, eight output monaural
ampli ier or a two channel, our output stereo ampli ier. Since both input
ampli iers are the same only the A channel will be described.
The di erential input signal is applied to the inverting inputs o U3:A and U3:B.
An inverted version o the common mode signal (i any) is also applied to these
inputs rom U6:A such as to cancel any common mode component at the outputs
o U3:A and U3:B. The outputs rom U3:A and U3:B are then applied to the
di erential ampli ier, U6:B. Optimum common mode balance is achieved by
adjusting RV3 at the output o U6:A.
The output rom the di erential ampli ier passes via the gain control
potentiometer, RV1, to the programmable gain ampli ier, U5:A. This ampli ier
provides ixed gains o 0dB, +9dB, +18dB and +27dB. The desired gain is set by
H1.
The output rom U5:A is connected to the irst group o our output ampli iers and
also to the MONO/STEREO selector, H2. U4:A provides the un-inverted signal to
the non-inverting output drivers, while U4:B provides an inverted signal to the
inverted output drivers. The A channel drivers are contained in U1 and U8 while
the B channel drivers are contained in U2 and U9. U4:C and U4:D provide the
input to the B channel output drivers.
The input and gain stages are powered rom ±15V supplies provided by VR1 and
VR2.
The output drivers are powered directly rom the ±21V supplies.

5
SECTION V
SECTION VSECTION V
SECTION V
ADA
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Diagrams
DiagramsDiagrams
Diagrams
ADA-101 PIN ASSIGNMENTS
ADA-101 AUDIO DISTRIBUTION AMPLIFIER
PS-102 AUDIO POWER SUPPLY

6
PIN ASSIGNMENTS
PIN ASSIGNMENTSPIN ASSIGNMENTS
PIN ASSIGNMENTS
ADA
ADAADA
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Audio Distribution Ampli ier
Audio Distribution Ampli ierAudio Distribution Ampli ier
Audio Distribution Ampli ier
INPUT A -…..A 1....INPUT A+
OUTPUT 1 -…..B 2…..OUTPUT 1+
OUTPUT 2 -…..C 3....OUTPUT 2+
OUTPUT 3 -…..D 4....OUTPUT 3+
OUTPUT 4 -…..E 5....OUTPUT 4+
INPUT B -…...F 6....INPUT B+
OUTPUT 5 -…..G 7....OUTPUT 5+
N.C…..H 8....OUTPUT 6+
N.C.…..I 9....GND
OUTPUT 6 -…..J 10...OUTPUT 7+
GND…...K 11...+21 VOLTS
OUTPUT 7 -…..L 12...OUTPUT 8+
N.C…..M 13...-21 VOLTS
OUTPUT 8 -…..N 14...N.C.
N.C…. O 15...GND