W925E240 Datasheet, PDF (69/73 Pages) Winbond – 8-BIT CID MICROCONTROLLER

W925E/C240
8.5 AC Characteristics
(AC timing characteristics supersede the recommended operating conditions unless otherwise stated.)
Dual Tone Alert Signal Detection Interface
PARAMETER
Low Tone Frequency
High Tone Frequency
Frequency Deviation accept
Frequency Deviation reject
SYMBOL
f_L
f_H
MIN.
1.1
3.5
TYP.
2130
2750
MAX.
Maximum Input Signal Level
0.22
Input Sensitivity Per Tone
-40
-38
Reject Signal Level Per Tone
-48
Positive and Negative Twistb Accept
7
Noise Tolerance
SNR_TONE
20
Notes:
a. dBm = decibels with a reference power of 1 mW into 600 ohms, 0 dBm = 0.7746 Vrms.
b. Twist = 20 log (fH amplitude / fL amplitude).
1. Both tones have the same amplitude. Both tones are at the nominal frequencies.
2. Band limited random noise 300 - 3400 Hz. Present only when tone is present.
3. Range within which tones are accepted.
4. Ranges outside of which tones are rejected.
5. These characteristics are at V_DD = 5V and temperature = 25 °C.
UNITS
Hz
Hz
%
%
dBma
dBm
dBm
dB
dB
NOTES
3
4
5
5
1, 2
Dual Tone Alert Signal Detection
PARAMETER
CONDITION SYM. MIN. TYP^‡ MAX. UNITS NOTES
Alert Signal Present Detect Time
Alert Signal Absent Detect Time
ALGR
t_DP
0.5
t_DA
0.1
10
mS
8
mS
"‡" Typical figure are at V_DD = 5V and temperature = 25 °C are design aids only, not guaranteed and not subject to production
testing.
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Publication Release Date: July 12, 2005
Revision A10