FX506 Datasheet, PDF (6/17 Pages) Sanyo Semicon Device – High-Current Switching Applications

Circuit Descriptions and Serial Control Information ...... 1
Control bits
(LSB) loaded last
0
0
1
Function
Mic. Select
– Microphone Input 1
– Microphone Input 2
Notes
A multiplexed “microphone” input allowing the use
of differing type and level voice inputs.
12
00
01
10
11
3456
0000
1000
0100
1100
0010
1010
0110
1110
0001
1001
0101
1101
0011
1011
0111
1111
Input Select
– Rx Input
De-emphasis Bypass; HPF to 0dB
– Rx Input
De-emphasis Select; HPF to 0dB
– Tx Input
Powersave De-emphasis;
HPF to 14dB
– Path Input to V ;
BIAS
Powersave De-emphasis
Input Gain Amplifier
– Gain Set
0.0dB
1.0dB
2.0dB
3.0dB
4.0dB
5.0dB
6.0dB
7.0dB
8.0dB
9.0dB
10.0dB
11.0dB
12.0dB
13.0dB
14.0dB
15.0dB
Transmit or receive audio sources are selected,
inserting the appropriate path gain for the chosen
input.
The input path can be set to bias whilst allowing
receiver noise monitoring.
A gain element intended to adjust the drive level to
the compressor, catering for differing signal
sources and microphone sensitivities.
7 8 9 14
1111
0111
X011
XX0 1
XXX 0
Compressor
Enabled
Powersaved
Powersaved
Powersaved
Powersaved
HPF
Enabled
Enabled
Powersaved
Powersaved
Powersaved
LPF
Enabled
Enabled
Enabled
Powersaved
Powersaved
Pre-Process Output
Enabled
Enabled
Enabled
Enabled
Powersaved
The Pre-Process Path LPF should be selected whilst CEPT ‘Response to the Tx to Mod.
frequencies exceeding 3kHz’ tests are carried out.
10 11 12 13
0000
1000
0100
1100
0010
1010
0110
1110
0001
1001
0101
1101
0011
1011
0111
1111
14
0
1
Pre-Process Gain
– Gain Set
-2.75dB
-2.50dB
-2.25dB
-2.00dB
-1.75dB
-1.50dB
-1.25dB
-1.00dB
-0.75dB
-0.50dB
-0.25dB
0dB
0.25dB
0.50dB
0.75dB
1.00dB
Pre-Process Output
– Disable Pre-Process Output
Output at V
BIAS
– Enable Pre-Process Audio Output
6
An in-line output drive stage providing adjustable
gain or attenuation to compensate for level
tolerances in the external audio processes and
peripherals.
The output of this amplifier stage is available for
further voice (audio) processing such as
“Frequency Inversion Voice Scrambling.”
Bit 14 is the Enable/Powersave function for the
Pre-Process output stages.
See Bits 7 8 9 14 .....
Reference ...... Figure 4