ADA-21S
STEREO AUDIO
DISTRIBUTION AMPLIFIER
INSTRUCTION MANUAL
SIGMA ELECTRONICS, INC.
P.O. Box 448
1027 COMMERCIAL AVENUE
EAST PETERSBURG, PA 17520-0448
(717) 569-2681
ADA-21S STEREO AUDIO DISTRIBUTION AMPLIFIER
AUDIO CONFIGURATIONS:
The source and destination audio equipment must be evaluated to determine if they are Balanced or
Unbalanced. After determination is made, refer to the drawings provided to select the proper audio
configuration. The outputs can be any combination of balanced or unbalanced.
ADA-21
ADA-21
+
C
Open
+
C
-
+
C
-
+
C
-
+
C
-
+
C
-
+
C
-
+
C
-
IN
OUT
IN
OUT
Balanced In to Balanced Out
Vout = Vin
Balanced In to Unbalanced Out
Vout = 0.5 Vin
ADA-21
ADA-21
+
+
C
-
+
Gnd
+
C
-
+
C
Open
+
+
Gnd
+
C
-
C
C
-
-
IN
OUT
IN
OUT
Unbalanced In to Balanced Out
(-) Input Grounded; Vout = Vin
Unbalanced In to Unbalanced Out
Vout = 0.5 Vin
(-) Input Floating: Vout = 0.75 Vin
The input to output level comparison provided in the figures above, assumes the outputs are terminated
into a 600Ω load.
FRONT PANEL:
The adjustments and indicators on the front panel (Figure 3) can be accessed through the slots provided
in the frame in which the ADA-21S is installed. When mounted within the SS-2100 Series frames, it will be
necessary to remove the front panel of the frame to gain access to these items. Factory settings of the module
provide unity gain when terminated in 600Ω, and a bandwidth of 30 KHz.
Gain control for the right channel is achieved by adjustments to S01and R012. Gain control for the left
channel is achieved by adjustments to S901and R912. S01 and S901 provide gain adjustment in increments
of 6dB, while R012 and R912 provide fine adjustments of +/- 3dB. The positions of S01 make the following
adjustments to the gain level of the circuit -
+24dB.
= OFF, 1= -6dB, 2= 0dB, 3= +6dB, 4= +12dB, 5= +18dBand 6=
3
2
3
4
2
4
1
5
6
1
5
6
S901
S01
R912
R012
Figure 3: Front Panel Gain Adjustment
ADA-21
Doc. No. – 14466
Page 2 of 3
ADA-21S STEREO AUDIO DISTRIBUTION AMPLIFIER
ADJUSTMENTS:
The ADA-21S has no adjustments other than the front panel gain control.
SPECIFICATIONS:
INPUT: ...............................................Dual channel, Balanced, +24 dBm Maximum
INPUT IMPEDANCE: ........................30 kΩ Balanced, DC coupled
OUTPUT: ...........................................+24 dBm Maximum
OUTPUT IMPEDANCE: ....................100Ω Balanced, DC coupled
LEFT/RIGHT SEPARATION: ............All outputs driven into 600Ω, unused input terminated.
............................................................Greater than 80 dB, 20 Hz to 20 KHz
HUM and NOISE: ..............................less than -80 dBm at Unity Gain, 22Hz to 22Khz filter
less than -65 dBm at +27 dB Gain, 22Hz to 22Khz filter
THD+N: .............................................Into 600Ω, 22Hz to 22Khz filter, 0dBm to +24 dBm
less than 0.05% 20 Hz to 20KHz)
IND (SMPTE 4:1 60Hz/7KhZ): ..........same conditions as THD+N, less than 0.02%
GAIN RANGE: ...................................(-6) to +24 dB in 6dB steps,±3dB vernier when terminated into 600Ω.
GAIN VARIATION: ............................±0.3 dB
CMR: .................................................Greater than 70 dB at 60 Hz, 60 dB at 20 KHz
0dBm to +24dBm
RESPONSE: ......................................Into 600Ω, ±0.2 dB, 20 Hz to30 KHz
TECHNICAL MANUAL:
A manual including schematics, circuit description, parts list and setup guide is available upon request. This
information is intended for the service of the module. Modules should be serviced by Qualified Personnel only!
Sigma Electronics, Inc. recommends service to be performed by our Factory Service Center.
All specifications, drawings, dimensions, weights and other details are subject to change without notification.
Information is intended to give a general performance and operation guideline of the product.
Sigma Electronics, Inc.; P.O.Box 448; 1027 Commercial Avenue; East Petersburg, PA 17520-0448
Main Office: Tel: (717) 569-2681 Fax: (717) 569-4056
REV1 JUN00
ADA-21S
ADA-21
Doc. No. – 14466
Page 3 of 3
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