FX506 Datasheet, PDF (8/17 Pages) Sanyo Semicon Device – High-Current Switching Applications

Circuit Descriptions and Serial Control Information ...... 3
Control bits
Element
Notes
28 29 30
000
100
010
110
001
101
011
111
31
0
1
32 33 34 35
0000
1000
0100
1100
0010
1010
0110
1110
0001
1001
0101
1101
0011
1011
0111
1111
VCO Drive Attenuator I
– Gain Set -22.4dB
-19.2dB
-16.0dB
-12.8dB
-9.6dB
-6.4dB
-3.2dB
0dB
VCO Drive Attenuator II
– Gain Set -25.6dB
0dB
VCO Drive Amplifier
– 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
An in-line control attenuator for the VCO Tx channel
drive output.
This channel is also selected as Audio Output (Rx)
under the control of bit 36. This attenuator can be
used in a volume control application.
An in-line control attenuator for the VCO Tx channel
drive output. As an example, when bits 28 to 31 are
set to “0,” the gain set is -48.0dB (-22.4 + -25.6).
The in-line control amplifier/attenuator for the VCO
Tx channel drive output.
This channel is also selected as Audio Output (Rx)
under the control of bit 36. This amplifier can be
used in a volume control application.
27 36
00
01
10
11
VCO Drive (Tx)
VCO Ref (Tx)
Audio Output
Output
Output
(Rx)
Bias
Bias
Bias
Bias
Bias
Enabled
Enabled
Enabled
Bias
Enabled
Enabled
Enabled
The Drive and Ref. paths are powersaved by Bits 45 and 46 in the “Total Powersave” or
“Listening Powersave” conditions. When making internal changes it is recommended that these
outputs are disconnected (placed in a bias condition) from the relevant output (load) circuitry.
37 38 39
000
100
010
110
001
101
011
111
40
0
1
Squelch Filter (Gain)
– Gain Set
-3.0dB
-2.0dB
-1.0dB
0dB
1.0dB
2.0dB
3.0dB
4.0dB
Squelch Filter (Narrow/Wide)
– Narrow (ƒc ≈ 18kHz ± 6.5kHz).
– Wide
(ƒc ≈ 25kHz ± 8.5kHz).
The squelch function is set by bits 45 & 46
(Squelch Source Selection).
The centre frequency gain of this element is 35dB,
data selected gain variations (-3.0dB to 4.0dB) are
around this value.
For use in wide or narrow channel systems.
The squelch function is set by bits 45 & 46
(Squelch Source Selection).
Reference ...... Figure 4
8