Amplifier 4 MOST
User Manual
3 Electrical Characteristics
3.1 Operating Conditions
The Amplifier 4 MOST supports the following operating modes:
“Full on”: Amplifiers provide full amplification
“Idle”:
Digital circuits operate with amplifiers muted
“Sleep”:
Fiber optic receiver unit active and waiting for light input
The power supply operates normally while the input voltage is between 10 and 16 Volt DC. The
Amplifier 4 MOST will mute on the following fault conditions:
1. Under voltage – input voltage drops below 10 Volt DC
2. Loss of Light – optical input shut off or removed
Operating conditions:
Symbol Description
Conditions
Min
Typ
Max Units
V
bat
Operating Supply Voltage
Full ON operation
10
14.4
18
V
V
idle
Idle Supply Voltage
Idle operation
5
10
V
I
q
Idle Supply Current
Muted
1
A
I
sleep
Sleep Supply Current
Light off for 1 Min
160
µA
I
pk
Peak Supply Current
40
A
Table 3-1: Operating characteristics
3.2 Amplifier Channel Characteristics
Symbol Description
Conditions
Min
Typ
Max Units
P
out
Output
Power
R
L
=4
Ω
, THD=10 %
25
W
R
L
=2
Ω
, THD=10 %
40
W
THD
Volume = 0x40
-85
dB
PSRR
Power Supply Rejection
-60
dB
DR
Dynamic Range
Volume=Max vs
Volume=min+1
110
dB
V
n
(0) Output
Noise
Volume=0x00
200
µV
rms
f
lo
Low frequency cutoff
50
Hz
f
hi
High Frequency cutoff
20
kHz
Frequency response
From f
lo
to f
hi
-3
0.5
dB
V
ffs
Full Scale Output Voltage
8.5
V
rms
Table 3-2: Amplifier channel characteristics
The amplifiers are short-circuit protected. All tests performed using a 1FFS digital source on the
MOST Network, V
bat
= 14.4 Volt DC, sound settings flat, output signal measured at the output
terminals of the Amplifier 4 MOST.
User Manual
©
Copyright 2002 - 2003 OASIS SiliconSystems
Page 10
Amplifier 4 MOST Version: 2.0 User Manual
Document Version: 2.0-03 Release Date: 2003-07-23
