FX375 데이터 시트보기 (PDF) - CML Microsystems Plc
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FX375 Datasheet PDF : 11 Pages
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Operational Information
XTAL/CLOCK
1
XTAL
2
LOAD/LATCH
3
SERIAL ENABLE 1 –
D5
4
SERIAL ENABLE 2 –
D4
5
SERIAL DATA INPUT – D3
6
SERIAL CLOCK INPUT – D2
7
D1
8
D0
9
Rx TONE DECODE OUTPUT
DECODE COMPARATOR INPUT
D1
Rx TONE DETECT OUTPUT
R3
10
11
12
13
NOTONE OUTPUT
14
R2
C7
Fig.2 External Component Connections
VDD
28
27
26
25
24
23
FX375J
22
21
20
19
18
17
16
15
C9
V
SS
C5
Rx TONE INPUT
PRIVATE ENABLE
Rx/Tx
CONTROL
PTL
C3
Tx AUDIO INPUT
Rx AUDIO INPUT
C4 Tx AUDIO OUTPUT
Rx AUDIO OUTPUT
BALANCED MODULATOR INPUT
C6
FILTER OUTPUT
Tx TONE OUTPUT
VBIAS
C8
C 10
V
SS
Component Tolerances
Resistors ± 10%
Capacitors ± 20%
Recommended Xtal Components
XTAL/CLOCK
1
X1
R 1 FX375J
C2 C 1
2
XTAL
VSS
Component
R1
R2
R3
C1
C2
C3
C4
C5
C6
C7
C8
C9
C10
D1
X1
Unit Value
1M
820k
330k
33p
33p
0.1µ
0.1µ
0.1µ
1.0µ
0.1µ
1.0µ
1.0µ
1.0n
Small Signal
4MHz
Operational Truth Table – Table 1 (below) illustrates the output paths and logic functions of the FX375 Private
Squelch Circuit in both Receive and Transmit modes.
Receive Operation – (Rx/Tx = '1')
In the Rx mode Tx Tone and Tx Audio paths are held at bias.
D0 – D5
Tone
Tone
Tone
Notone
Tone
Tone
Tone
Notone
Notone
1
1
1
0
1
1
1
0
Private
Enable
0
0
0
0
1
1
1
1
Rx Tone
Rx Tone
PTL
Detect
Decode
1
0
1
0
0
1
X
1
0
X
X
0
1
0
1
0
0
1
X
1
0
X
X
0
Receive Signal Path
State
Condition
bias
open
open
open
bias
open
open
open
X
Not Inverted
Inverted
Not Inverted
X
Not Inverted
Not Inverted
Not Inverted
Transmit Operation – (Rx/Tx ='0')
In the Tx mode the Rx audio path is held at bias and the Rx Tone Detect output at logic '0.'
D0 – D5
Tone
Tone
Notone
Tone
Tone
Notone
Notone
1
1
0
1
1
0
Private
Enable
0
0
0
1
1
1
PTL
1
0
X
1
0
X
Transmitted Tone
State
Phase
active
active
bias
active
active
bias
0°
180°
X
0°
180°
X
Transmit Signal Path
State
Condition
open
open
open
open
open
open
Inverted
Inverted
Not Inverted
Not Inverted
Not Inverted
Not Inverted
Notes
1. The pre- and de-emphasis circuits remain in the Transmit path during Clear and Private operation.
2. Power remains applied to the CTCSS tone decoder at all times.
3. Carrier Frequency = 3333Hz during Private operation (Tx or Rx).
4. During Clear operation the carrier frequency is turned off to reduce spurious emissions.
5. Under Rx-Notone conditions the Notone output can be used to operate squelch circuitry.
6. The functions in this table are applicable when the device is connected as recommended in Figure 2.
Table 1 Functions and Outputs
4
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