ADA-101R
Remote Gain Audio
Distribution Amplifier
RJM & Associates, LLC
175 Joerschke Drive, Suite A
Grass Valley, CA 95945
Phone: 530-205-3437 Fax: 530-273-8482
info@rjmandassociates
www.rjmandassociates.com
Statement of Warranty
Statement of Warranty
Statement of WarrantyStatement of Warranty
RJM & Associates, LLC warrants its products for a period of three (3) years from
the date of shipment to be free from defects in materials and workmanship and
meets applicable published specifications. Equipment which has been operated
within its ratings and has not been subjected to mechanical or other abuse or
modification by the purchaser, its agents, and/or employees, will, at the option of
RJM, be replaced or repaired if it is returned, freight prepaid, to RJM &
Associates, LLC. Equipment that fails under conditions other than described
herein will be repaired at the price of components and labor 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 merchantability or fitness
for a particular purpose. RJM is not liable for any consequential damages.
FCC Compliance
FCC Compliance
FCC ComplianceFCC Compliance
This equipment has been 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 reasonable 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 be required to correct the
interference at his own expense.
Copyright
Copyright
CopyrightCopyright
© 2014 RJM & Associates, LLC
Contents of this publication may not be reproduced in any form without the
written permission of RJM. Reproduction or reverse engineering of copyrighted
software is prohibited.
July 2014
Part Number 71
71----00
0022225555
7171
0000
Table of Contents
Table of Contents
Table of ContentsTable of Contents
Section I
Section I
Section ISection I
General Description ................................................................................................ 1
Section II
Section II
Section IISection II
Specifications .......................................................................................................... 2
Section III
Section III
Section IIISection III
Installation ............................................................................................................... 3
Section IV
Section IV
Section IVSection IV
Circuit Description ................................................................................................... 5
Section V
Section V
Section VSection V
Diagrams ................................................................................................................. 6
Module Schematics ........................................................................................... 7
SECTION I
SECTION I
SECTION ISECTION I
ADA
ADA----101/R
ADAADA
General Description
General Description
General DescriptionGeneral Description
101/R
101/R101/R
The ADA-101/R is a modular, high performance audio distribution amplifier
intended for studio quality audio distribution systems. It is designed to be
operated from the RJM AMF-100 mounting frame, or it is pin-compatible with the
Leitch* FR-883/884 audio mounting frames.
The module can be configured as a one-input by six-output monaural, or as two,
one-input by three-output stereo amplifiers, just by moving one internal jumper.
In the MONO mode only the
Channel A
input connector is used. The
Channel B
input is left unconnected.
All inputs can be connected balanced or unbalanced. Outputs are always
balanced. The unit offers a ±20dB remotely controlled audio gain, which is
selectable to either remote or local operation.
Each module has its own on-board voltage regulators with fuse protection. Any
failure of a single module will not affect any other.
*Leitch is a trademark of Leitch Technology International, Inc.
SECTION II
Total Harmonic Distortion, (THD)
Intermodulation Distortion, (IMD)
SECTION II
SECTION IISECTION II
ADA
ADA----101/R
ADAADA
Specifications
Specifications
SpecificationsSpecifications
101/R
101/R101/R
Input:
Input:
Input:Input:
Number 2, Channel A and Channel B, (Channel A
used for mono)
Impedance
Maximum level
Common Mode Rejection (CMRR)
Common Mode Range
>30KΩ balanced, >12KΩ unbalanced
+30dBu (66Ω), +24dBm (600Ω)
>90dB @60Hz, >60dB @ 20KHz
±20volts
Outputs:
Outputs:
Outputs: Outputs:
Channels 1 (mono) or 2 (stereo)
Outputs per channel 3 balanced stereo, 6 balanced monaural
Impedance
Maximum Level
66Ω balanced or 600Ω balanced
+30dBu (66Ω), +24dBm (600Ω)
Remote
Remote Gain:
Remote Remote
Gain:
Gain:Gain:
Control local/remote switch selectable
Type DC control
Range
±20dB
Performance:
Performance:
Performance:Performance:
(each channel).
Gain range
Frequency Response
± 20dB
± 0.05dB, 20Hz to 20KHz, ref. 1KHz any
level to +30dBu (66Ω), +24dBm (600Ω)
<0.05%, 20Hz to 20KHz @ +30dBu (66Ω),
+24dBm (600Ω)
<0.02% 4:1 SMPTE @18dBu (66Ω),
+18dBm (600Ω)
Isolation between Modules >100dB, 20Hz – 20KHz
Interchannel Crosstalk >95dB, 20Hz – 20KHz
Power Dissipation <2.5W
2
SECTION III
SECTION III
SECTION IIISECTION III
ADA
ADA----101/R
ADAADA
Installation and Operation
Installation and Operation
Installation and Operation Installation and Operation
The ADA-101/R audio distribution amplifier is designed to be mounted in either
the RJM AMF-100 audio mounting frame, (up to twelve modules), or a Leitch*
audio frame (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 frame.
It is recommended that when redundant power supplies are included in the
frame, the two power cords be connected to different AC supplies. In this way
the frame will continue to operate even if there is a partial failure of plant power.
Before installing the module in the frame, it is necessary to set the internal
jumper H2 to either MONO or STEREO mode. Also the switch S1 must be set for
either local or remote gain control.
The frame input and output connections are similar for both the RJM and the
Leitch* frames. They consist of three-pin terminal blocks as defined below:
CH A
CH A CH B
CH ACH A
CH B
CH BCH B
101/R
101/R101/R
INPUTS
J2 J1
J4 J3
OUTPUTS -
-
S
+
S S
+
+
S
-
+
-
3
The ADA-101/R is capable of remote gain control operation. Placing the toggle
switch on the module in the REMOTE position will allow adjustment of the
amplifier gain from a external linear 10K potentiometer. The connection of the
pot is accomplished by utilizing the lowest most output connector for channel B
on the particular input/output group on the AMF-100 mounting frame. The
connections are as follows:
CH A
CH A CH B
CH ACH A
CH B
CH BCH B
INPUTS
J2 J1
Ctl
OUTPUTS
Gnd
+5v
-
S
+
+
S
-
4
SECTION IV
SECTION IV
SECTION IVSECTION IV
ADA
ADA----101/R
ADAADA
Circuit Description
Circuit Description
Circuit DescriptionCircuit Description
The ADA-101/R consists of two identical input circuits and two identical groups of
three output circuits. A jumper (H1) permits the two output channels to be both
connected to one input channel for use as a one input, six output monaural
amplifier or as a two channel, three output per channel stereo amplifier. Since
both input amplifiers are the same only the A channel will be described. The
differential input signal is applied to the inverting inputs of U3:A and U3:B. An
inverted version of the common mode signal (if any) is also applied to these
inputs from U7:A such as to cancel any common mode component at the outputs
of U3:A and U3:B. The outputs from U3:A and U3:B are then applied to the
differential amplifier, U7:B. Optimum common mode balance is achieved by
adjusting RV6 at the output of U7:A.
The output from the differential amplifier passes via the gain control
potentiometer, RV1, to the variable gain amplifier, U6. U5:A inverts the second
input to U6. U6 provides gain adjustment under control of the front adjustment
potentiometer, RV5, or via a remote control voltage from the rear panel (output
B4). The variable gain amplifiers in each channel are controlled by the same
control voltage from U15. The circuitry associated with U15 scales the control
voltage and also provides temperature compensation for U6. The balance
potentiometer, RV2, is not used with the “T” version of the SSM2018.
The output from U6 is connected to the first group of four output amplifiers and
also to the MONO/STEREO selector, H1. 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 U12 while
the B channel drivers are contained in U2 and U13. U4:C and U4:D provide the
input to the B channel output drivers.
The input and gain stages are powered from ±15V supplies provided by VR1 and
VR2.
The output drivers are powered directly from the ±21V supplies.
101/R
101/R101/R
5
SECTION V
SECTION V
SECTION VSECTION V
ADA
ADA----101/R
ADAADA
ADA-101/R PIN ASSIGNMENTS
ADA-101/R AUDIO DISTRIBUTION AMPLIFIER
PS-102 AUDIO POWER SUPPLY
101/R
101/R101/R
Diagrams
Diagrams
DiagramsDiagrams
6
Audio
Audio Distribution Amplifier
Audio Audio
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+
OUTPUT 6 -…..J 10...OUTPUT 7+
OUTPUT 7 -…..L 12...REMOTE GAIN
REMOTE GAIN (+5v)…..N 14...N.C.
PIN ASSIGNMENTS
PIN ASSIGNMENTS
PIN ASSIGNMENTSPIN ASSIGNMENTS
ADA
ADA----101/R
ADAADA
Distribution Amplifier
Distribution AmplifierDistribution Amplifier
N.C…..H 8....OUTPUT 6+
N.C.…..I 9....GND
GND…...K 11...+22VOLTS
N.C…..M 13...-22VOLTS
N.C…. O 15...GND
101/R
101/R101/R
7
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