Consumer Microcircuits Limited FX105AP3, FX105AD4 Datasheet
CML Semiconductor Products
Tone Detector FX105A
D/105A/3 December 1995
1.0 Features Advance Information
•• Operates in High Noise Conditions •• Adjustable Bandwidth
•• ≥≥ 36dB Signal Input Range •• Adjustable Frequency
•• High Sensitivity •• Wide Voltage Range (2.7V to 5.5V)
•• Low Power •• Single and Multitone System
Applications
1.1 Brief Description
The FX105A is a monolithic CMOS tone operated switch, designed for tone decoding in single and
multitone signalling systems. The FX105A uses decoding techniques which allow a tone to be
recognised in the presence of high noise levels or strong adjacent signals. Detection centre frequency
and bandwidth can each be independently adjusted. The design is immune to high levels of harmonic
and sub-harmonic interference. Excellent noise immunity and constant bandwidth are maintained over
a wide range of input signal levels.
1996 Consumer Microcircuits Limited
Tone Detector FX105A
CONTENTS
Section Page
1.0 Features..........................................................................................................1
1.1 Brief Description............................................................................................1
1.2 Block Diagram................................................................................................3
1.3 Signal List.......................................................................................................4
1.4 External Components....................................................................................5
1.5 General Description.......................................................................................6
1.6 Application Notes..........................................................................................7
1.6.1 General............................................................................................7
1.6.2 Method for Calculating External Component Values.......................7
1.7 Performance Specification .........................................................................12
1.7.1 Electrical Performance .................................................................. 12
1.7.2 Packaging......................................................................................14
1996 Consumer Microcircuits Limited 2 D/105A/3
Tone Detector FX105A
1.2 Block Diagram
Figure 1 Block Diagram
1996 Consumer Microcircuits Limited 3 D/105A/3
Tone Detector FX105A
1.3 Signal List
Package
D4/P3
Signal Description
Pin No. Name Type
1 INPUT AMP IN I/P AC couple to this input of the input buffer
amplifier.
2 INPUT AMP OUT O/P The input buffer amplifier output.
3 RW I/P The input to the Detect/Word filter.
4 RV I/P The input to the VCO loop filter.
5 C3A O/P Word filter capacitor pin A.
6 C3B O/P Word filter capacitor pin B.
7 C2A O/P VCO Loop filter capacitor pin A.
8 C2B O/P VCO Loop filter capacitor pin B.
9 DETECT OUT O/P Open drain PMOS output, active on detect.
is required.
SS
10 V
SS
Note that a load resistor to V
Power Ground.
11 R2HI I/P Bandwidth control resistor pin A.
12 R2LO I/P Bandwidth control resistor pin B.
13 C1B O/P VCO capacitor B.
14 C1A O/P VCO capacitor A.
15 R1 I/P VCO discharge resistor. When potentiometer
tuning is required, a series resistor is
recommended to prevent possible shorting to
ground.
16 V
DD
Power Power supply.
Notes: I/P = Input
O/P = Output
1996 Consumer Microcircuits Limited 4 D/105A/3
Tone Detector FX105A
1.4 External Components
C
C
C
C
C
C
C
C
C
See section 1.6 R
1A
See section 1.6 R
1B
See section 1.6 R
2A
See section 1.6 R
2B
See section 1.6 R
3A
See section 1.6 R
3B
See section 1.6 D
4
0.27µF ±20%
5
0.1µF ±20%
6
1F
1V
2
L
V
W
1
See section 1.6
See section 1.6
See section 1.6
20kΩ ±20%
See section 1.6
See section 1.6
IN914 or similar
Notes: 1. For improved performance C4 may be chosen to provide 30° phase shift at the VCO
loop filter input.
2. For compatibility with the FX105P; capacitors (C1 .... C4) may be connected to V
DD
instead of VSS.
3. For improved de-response time, a diode (D
4. Any value load resistance (R
) may be used, providing the maximum load current does
L
) may be added.
1
not exceed the value given in section 1.7.1
Figure 2 Recommended External Components
1996 Consumer Microcircuits Limited 5 D/105A/3
Loading...