FX465 View Datasheet(PDF) - CML Microsystems Plc
Part Name
Description
Manufacturer
FX465 Datasheet PDF : 9 Pages
| |||
Application Information
External Components
Component
Value
R
1
1.0MΩ
R2
560kΩ
RC31
820kΩ
0.1µF
C
18pF
2
C
33pF
3
C
0.1µF
4
C5
0.1µF
Tolerance
±10%
±10%
±10%
±20%
±20%
±20%
±20%
±20%
C
0.47µF
±20%
6
C7
0.1µF
±20%
C8
0.1µF
±20%
C9
0.1µF
±20%
C10
0.1µF
±20%
C
0.1µF
±20%
11
D1
small signal type
X
4.0MHz
±0.01%
1
Note: The values specified for R , C and C have been found to be satisfactory when used with a crystal (X ) whose
12
3
1
equivalent series resistance is <= 1000 ohms. The crystal manufacturer should be consulted to determine optimum
values for different crystals.
The 0.1µF value for the dc blocking capacitors C , C , C , C , C , C and C11 are not a requirement. For the capacitors
4 5 7 8 9 10
C , C and
ca4pac5itors
C , the
ex1t0ernal
input impedance is internal
circuits will be important in
to the device and
determining input
specified as
impedance.
typically
550kΩ.
For
the
remaining
Fig.2 Recommended External Components
Input Pin Condition
D0 to D5 Rx/Tx PTL
Decode
Comp.
Input
Output Pin Condition
Rx Tone Rx Tone
Detect Decode
Result and/or Function
Tone
Tx Audio
Tx
Path
Enabled Enabled
Tone Rx Audio
Decoder Path
Enabled Enabled Notes
TONE
0
0
X
NOTONE
0
X
X
TONE
1
0
0
TONE
1
1
0
TONE
1
X
1
NOTONE
1
X
X
0
1
0
1
0
1
0
1
1
0
X
0
YES
YES
NO (BIAS)
YES
NO (BIAS)
NO
NO (BIAS)
NO
NO (BIAS)
NO
NO (BIAS)
NO
NO
NO
YES
YES
YES
YES
NOTES
1 Normal tone transmit condition.
2 NOTONE programmed in Tx mode; tone transmit output set to VDD/2. Tx audio path enabled.
3 Normal decode standby.
4 Normal decode standby with PTL used to enable audio.
5 Normal ‘decode of correct CTCSS tone’ condition; PTL has no effect.
6 NOTONE programmed in Rx mode; tone transmit output (BIAS). Rx audio path enabled.
Table 1 Combinations of Input/Output Conditions
NO (BIAS) 1
NO (BIAS) 2
NO (BIAS) 3
YES
4
YES
5
YES
6
x = don't care
4
Share Link: 