Specification
Absolute Maximum Ratings
Exceeding the maximum rating can result in device damage. Operation of the device outside the operating limits is not
implied.
Supply Voltage
Input Voltage at any pin (ref V
SS
= 0V)
Sink/source current (supply pins)
(other pins)
Total device dissipation @ T
AMB
25°C
Derating
Operating temperature range:
Storage temperature range:
FX621P/LG/LS
FX621P/LG/LS
-0.3 to 7.0V
-0.3 to (V
DD
+ 0.3V)
±
30mA
±
20mA
800mW Max.
10mW/°C
-30°C to + 70°C
-40°C to + 85°C
Operating Limits
All device characteristics are measured under the following conditions unless otherwise specified :
V
DD
= 3.5V
T
AMB
= 25°C
Xtal/Clock f
C
= 4.433619MHz
Audio level 0dB ref = 775mV rms
Characteristics
Static Values
Supply Voltage (V
DD
)
Supply Current (I
DD
)
Input Logic “1”
Input Logic “0”
Output Logic “1”
Output Logic “0”
Impedances
"Gain Set" Amplifier Input
"Gain Set" Amplifier Output
Analogue Detector Input
Digital Inputs
Digital Output
Dynamic Values
Sensitivity
Required Signal to Noise Ratio
Upper Detector Threshold
Lower Detector Threshold
Amplifier Input Offset
Xtal Oscillator Frequency
Frequency Discrimination
'Will-Decode' Frequency Limits
'Will-Not Decode' Frequency Limits
System See Note
Min.
3.5
–
70.0
0
80.0
–
1.0
–
1.0
0.5
–
Typ.
–
1.0
–
–
–
–
–
–
–
1.0
–
248
45.0
2.1
1.4
15.0
4.433619
–
–
–
–
–
–
–
–
1.7
1.2
1.7
1.2
–
Max.
5.0
1.4
100
30.0
–
20.0
–
10.0
–
–
10.0
–
–
2.14
1.44
–
Unit
V
mA
% V
DD
% V
DD
% V
DD
% V
DD
MΩ
kΩ
MΩ
MΩ
kΩ
mVrms
dB
V
V
mV
MHz
kHz
kHz
kHz
kHz
kHz
kHz
cycles
ms
ms
ms
ms
ms
ns
12kHz/16kHz
1, 2
7
2
2
–
–
2.06
1.36
–
12kHz
16kHz
12kHz
12kHz
16kHz
16kHz
12/16kHz
12/16kHz
12kHz
16kHz
12kHz
16kHz
12/16kHz
3, 4
4
5, 7
5, 7
6, 7
6, 7
4
11.82
15.76
0
12.48
0
16.64
16.0
5.0
–
–
–
–
150.0
12.18
16.24
11.52
–
15.36
–
–
–
3.0
2.0
3.0
2.0
–
Timing Information
– Fig.3
Valid Tone Burst Length (t
M
)
Valid Space Length (t
S
)
Tone Response Time (t
R
)
De-response Time (t
D
)
SPM Output Reset Time (t
RESET
)
Notes
1.
2.
3.
4.
Device sensitivity at the Detector Input pin, or using the 'Gain Set' Amplifier at unity.
These values are quoted at 3.5 volt V
DD
, any supply variation will alter levels accordingly.
Tone Follower mode.
SPM Packet mode, in this mode the minimum valid Pulse (Space) length is programmable by means
of an RC network on the Pulse (Space) Length Time pin. If no RC network is used, the minimum
valid tone length reverts to 16 cycles.
5. The time for the circuit to recognize a valid 'Tone' in the Tone Follower mode.
6. The time for the circuit to recognize a valid 'No Tone' in the Tone Follower mode.
7. The FX621 is a low-power zero crossing detector without on-chip filtering, for use with a good
Signal-to-Noise ratio. The
FX611
is recommended for high noise environments. If the supply current
requirement of the
FX611
is unacceptable, separate external filters should be employed with the FX621.
5
CMLMICRO [ CML MICROCIRCUITS ]
