E0C5250
q
Crystal Oscillation Characteristics
Parameter
Oscillation start time
Symbol
t
sta
(Unless otherwise noted: V
DD
=2.7V to 5.5V, V
SS
=0V, C
G
=C
D
=18pF, Ta=25°C)
Condition
Min.
Typ.
Max. Unit
3.579545MHz oscillator
20 msec
q
FSK Demodulation Circuit Characteristics
FSK AC characteristics
(Unless otherwise noted: V
DD
=5.0/3.0V, V
SS
=0V, f
CLK
=3.579545MHz, Ta=-20 to 70°C)
Symbol
Parameter
Condition
Min.
Typ.
Max. Unit
Transfer rate
1188
1200
1212 Baud
T
RATE
Bell 202 mark (logic 1) frequency
1188
1200
1212 Hz
f
B1
Bell 202 space (logic 0) frequency
2178
2200
2222 Hz
f
B0
ITU-T V.23 mark (logic 1) frequency f
V1
1280
1300
1320 Hz
ITU-T V.23 space (logic 0) frequency f
V2
2068
2100
2132 Hz
SN ratio
20
–
–
dB
SNR
Carrier-detect ON sensitivity
∗
1
-44.9 -42.9 -40.9 dBm
CD
ONFSK
V
DD
=5V
(input level at TPI/RING)
Input amp gain (G
AMP
)=-5dB
-47.1 -45.1 -43.1 dBV
V
DD
=3V
-44.9 -42.9 -40.9 dBm
Input amp gain (G
AMP
)=-9.4dB
-47.1 -45.1 -43.1 dBV
Carrier-detect OFF sensitivity
∗
1
-46.9 -44.9 -42.9 dBm
CD
OFFFSK
V
DD
=5V
Input amp gain (G
AMP
)=-5dB
-49.1 -47.1 -45.1 dBV
V
DD
=3V
-46.9 -44.9 -42.9 dBm
Input amp gain (G
AMP
)=-9.4dB
-49.1 -47.1 -45.1 dBV
∗1:
When the gain in the input amp is set to G
AMP
(dB), the CD
ONFSK
and CD
OFFFSK
values (Typ.) can be calculated from the equation
below.
CD
ONFSK
[dBm] = -G
AMP
- 47.9 + 20log(V
DD
) [dBm], CD
ONFSK
[dBV] = -G
AMP
- 50.1 + 20log(V
DD
) [dBV]
5
5
V
DD
) [dBm], CD
OFFFSK
[dBV] = -G
AMP
- 52.1 + 20log(V
DD
) [dBV]
CD
OFFFSK
[dBm] = -G
AMP
- 49.9 + 20log(
5
5
FSK switching characteristics
Parameter
PDWN fall
→
FSK
Carrier detect start time
Data end
→
#DET rise
PDWN rise
→
Oscillation start
(Unless otherwise noted: V
DD
=5.0/3.0V, V
SS
=0V, f
CLK
=3.579545MHz, Ta=-20 to 70°C, C
L
=50pF)
Symbol
Condition
Min.
Typ.
Max. Unit
t
SUPD
20 msec
t
CDON
5
10
15 msec
t
CDOFF
5
10
15 msec
t
DOCH
V
DD
=5V
7
12 msec
V
DD
=3V
10
15 msec
1st RING
Input
#RDRC
#RDET
PDWN
#DET
SDO
OSC4
101010... 1
V
IH2
V
IL2
DATA
2nd RING
t
SUPD
t
CDON
101010... 1
DATA
t
CDOFF
t
DOCH
5
SEIKO [ SEIKO EPSON CORPORATION ]
