Fsk Energy Detection Mode Ac Characteristics; Fsk Energy Detection Mode Switching Characteristics - Epson S1C05251 Technical Manual

5.6.3 FSK Energy Detection Mode AC Characteristics

Unless otherwise noted: V
Parameter
Transfer rate
Bell 202 mark (logic 1) frequency
Bell 202 space (logic 0) frequency
ITU-T V.23 mark (logic 1) frequency
ITU-T V.23 space (logic 0) frequency f
SN ratio
Carrier-detect ON sensitivity ∗1
(input level at TPI/RING)
∗1 When the gain in the input amp is set to G
below.
CD [dBm] = -G
ONFSK

5.6.4 FSK Energy Detection Mode Switching Characteristics

Unless otherwise noted: V
Parameter
FSK energy detect capture time
FSK end → #IRQ rise
Figure 5.6.2 FSK energy detection mode switching characteristics
S1C05251 TECHNICAL MANUAL
=5.0/3.0V, V =0V, f
DD SS CLK
Symbol
T
RATE
f
B1
f
B0
f
V1
V2
SNR
CD V
ONFSK
Input amp gain (G
V
Input amp gain (G
(dB), the CD
AMP
- 46.0 + 20log( V
DD
) [dBm],
AMP
5
=5.0/3.0V, V =0V, f
DD SS CLK
Symbol
t
V
EGAQ
t
V
EGIH
FSK
#IRQ
t
EGAQ
5 ELECTRICAL CHARACTERISTICS
=3.579545MHz, Ta=-20 to 70°C
Condition
=5V
DD
)=-5dB
AMP
=3V
DD
)=-9.4dB
AMP
value (Typ.) can be calculated from the equation
ONFSK
CD [dBV] = -G
ONFSK
=3.579545MHz, Ta=-20 to 70°C, C
Condition
=5V
DD
=5V
DD
t
EGIH
EPSON
Min. Typ. Max.
1188 1200 1212
1188 1200 1212
2178 2200 2222
1280 1300 1320
2068 2100 2132
20 – –
-44.0 -41.0 -38.0
-46.2 -43.2 -40.2
-44.0 -41.0 -38.0
-46.2 -43.2 -40.2
- 48.2 + 20log( V
DD
) [dBV]
AMP
5
=50pF
L
Min. Typ. Max.
12 20
24 40
Unit
Baud
Hz
Hz
Hz
Hz
dB
dBm
dBV
dBm
dBV
Unit
msec
msec
21