Call Progress Mode (Cpm) Detection Circuit Characteristics; Cpm Ac Characteristics; Cpm Switching Characteristics - Epson S1C05251 Technical Manual

5.8

Call Progress Mode (CPM) Detection Circuit Characteristics

5.8.1 CPM AC Characteristics

Unless otherwise noted: V
Parameter
Carrier-detect ON sensitivity ∗1
(input level at TPI/RING)
Carrier-detect OFF sensitivity ∗1
∗1 When the gain in the input amp is set to G
from the equation below.
CD [dBm] = -G
ONCPM
CD [dBm] = -G
OFFCPM

5.8.2 CPM Switching Characteristics

Unless otherwise noted: V
Parameter
CPM tone-detect capture time
CPM tone end → #IRQ rise
S1C05251 TECHNICAL MANUAL
=5.0/3.0V, V =0V, f
DD SS CLK
Symbol
CD V
ONCPM DD
Input amp gain (G
V
DD
Input amp gain (G
CD V
OFFCPM DD
Input amp gain (G
V
DD
Input amp gain (G
(dB), the CD
AMP
- 48.0 + 20log( V
DD
) [dBm],
AMP
5
- 50.0 + 20log( V
DD
) [dBm],
AMP
5
=5.0/3.0V, V =0V, f
DD SS CLK
Symbol
t
CPMAQ
t
CPMIH
CPM
#IRQ
#DET
Figure 5.8.1 CPM switching characteristics
5 ELECTRICAL CHARACTERISTICS
=3.579545MHz, Ta=-20 to 70°C
Condition
=5V
)=-5dB
AMP
=3V
)=-9.4dB
AMP
=5V
)=-5dB
AMP
=3V
)=-9.4dB
AMP
and CD
ONCPM OFFCPM
CD [dBV] = -G
ONCPM
CD [dBV] = -G
OFFCPM
=3.579545MHz, Ta=-20 to 70°C, C
Min. Typ.
t
t
CPMAQ
EPSON
Min. Typ. Max.
-45.0 -43.0 -41.0
-47.2 -45.2 -43.2
-45.0 -43.0 -41.0
-47.2 -45.2 -43.2
-47.0 -45.0 -43.0
-49.2 -47.2 -45.2
-47.0 -45.0 -43.0
-49.2 -47.2 -45.2
values (Typ.) can be calculated
- 50.2 + 20log( V
DD
) [dBV]
AMP
5
- 52.2 + 20log( V
DD
AMP
5
=50pF
L
Max.
25
30
CPMIH
Unit
dBm
dBV
dBm
dBV
dBm
dBV
dBm
dBV
) [dBV]
Unit
msec
msec
23