FX506 Datasheet, PDF (7/17 Pages) Sanyo Semicon Device – High-Current Switching Applications

Circuit Descriptions and Serial Control Information ...... 2
Control bits
Element
Notes
Post-Process Gain
15
Pre-emphasis
Deviation Limiter
and
16
Post-Deviation Limiter Filter
0
– Narrow filter bandwidth,
cut-off = 2550Hz.
1
– Wide filter bandwidth,
cut-off = 3000Hz.
A fixed 2.0dB gain stage.
A selectable pre-emphasis stage set around
1.0kHz, with a characteristic of 6dB per octave.
It is available for use when transmitting data signals
such as FFSK. See Table below for Powersave
information.
A pre-set amplitude limiting stage for deviation
control.
This lowpass filter which is selected with the
Deviation Limiter, is adjustable to Narrow (2550Hz)
and Wide (3000Hz) bandwidths, allowing for
different channel-spacing requirements.
17
CTCSS/Data Input
0
– Disable Input path to Mixer system
1
– Enable Input path to Mixer system
15 18 19
X00
010
110
X11
X01
Pre-Emphasis
Powersaved
Powersaved
Enabled
Powersaved
Powersaved
Limiter and Post-Dev LPF
Powersaved
Enabled
Enabled
Powersaved
Powersaved
Drive Selected
Test Path
Post-ProcessPath
Post-Process Path
Post-Process Bypass
Bias
20 21 22
000
100
010
110
001
101
011
111
23 24 25 26
0000
1000
0100
1100
0010
1010
0110
1110
0001
1001
0101
1101
0011
1011
0111
1111
27
VCO Reference Drive Attenuator
– Gain Set
-28dB
-24dB
-20dB
-16dB
-12dB
-8.0dB
-4.0dB
0.0dB
VCO Reference 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
Output Drive Control
7
The in-line control attenuator for the VCO reference
channel drive output.
The in-line control amplifier/attenuator for the VCO
reference channel drive output.
Used in conjunction with Bit 36 to control output
functions.
Reference ...... Figure 4