Preliminary W91030B
FSK Detection
PARAMETER
SYMBOL
MIN.
TYP.
MAX.
UNITS
NOTES
Input Frequency Detection
Bell 202 Mark (logic 1)
Hz
MARK
F
1188
2178
1200
2200
1300
2100
1212
2222
+/-1%
+/-1%
SPACE
F
Bell 202 Space (logic 0)
CCITT V.23 Mark (logic 1)
CCITT V.23 Space (logic 0)
MARK
F
1280.5
2068.5
1319.5
2131.5
+/-1.5%
+/-1.5%
SPACE
F
Maximum Input Signal Level
Input Sensitivity
-5.78
-45
dBm
dBm
baud
dB
-43
1, 2
Transmission Rate
Input Noise Tolerance
Notes:
1188
20
1200
1212
FSK
SNR
1, 2, 3
1. Both mark and space have the same amplitude and are at the nominal frequencies.
2. These characteristics are fort VDD = 5V and temperature = 25 C.
°
3. Band limited random noise 300 - 3400 Hz. Present only when the FSK signal is present.
AC Timing Characteristics
(AC timing characteristics supersede the recommended operating conditions unless otherwise stated.)
System
PARAMETER
Wake-up Time
Sleep-down Time
SYMBOL CONDITION
MIN.
MAX. UNITS NOTES
TYP.§
WAKE
t
SLEEP
OSCO
50
1
mS
mS
SLP
t
Note: " " typical figures are for VDD = 5V and temperature = 25 C are design aids only, not guaranteed and not subject to
§
°
production testing.
Dual Tone Alert Signal Detection
PARAMETER
SYMBOL CONDITION MIN.
MAX. UNITS NOTES
TYP.§
Alert Signal Present Detect
Time
ALGR
0.5
10
mS
DP
t
Alert Signal Absent Detect Time
0.1
8
mS
DA
t
DD
Note: " " typical figure are at V = 5V and temperature = 25 C are design aids only, not guaranteed and not subject to
§
°
production testing.
FSK Detection
PARAMETER
SYMBOL CONDITION MIN.
MAX. UNITS NOTES
TYP.§
FSK Detection Enable Time
Input FSK to FCDN Low Delay
FSKE (high)
25
25
mS
mS
FSKE
t
CP
t
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