E0C5250
q
Dual-Tone (CAS) Detection Circuit Characteristics
CAS AC characteristics
(Unless otherwise noted: V
DD
=5.0/3.0V, V
SS
=0V, f
CLK
=3.579545MHz, Ta=-20 to 70°C)
Symbol
Condition
Min.
Typ.
Max. Unit
CD
ONTONE
V
DD
=5V, Bellcore mode
-39.8 -35.8 -35.1 dBm
Input amp gain (G
AMP
)=-5dB
Tone filter gain=-4dB
V
DD
=5V, BT mode
∗
2
-48.0 -44.0 -40.0 dBV
Input amp gain (G
AMP
)=-5dB
Tone filter gain=-4dB
V
DD
=3V, BT mode
∗
2
-39.8 -35.8 -35.1 dBm
Input amp gain (G
AMP
)=-9.4dB
Tone filter gain=-4dB
V
DD
=3V, BT mode
∗
2
-48.0 -44.0 -40.0 dBV
Input amp gain (G
AMP
)=-9.4dB
Tone filter gain=-4dB
Low tone frequency
f
LTONE
Bellcore (±0.5%)
2119.35 2130 2140.65 Hz
BT line disconnected
2110
2130
2150 Hz
BT line connected (±0.6%)
2117.22 2130 2142.78 Hz
High tone frequency
f
HTONE
Bellcore (±0.5%)
2736.25 2750 2763.75 Hz
2720
2750
2780 Hz
BT line disconnected
2733.50 2750 2766.50 Hz
BT line connected (±0.6%)
∗1:
When the gain in the input amp is set to G
AMP
(dB), the CD
ONTONE
value (Typ.) can be calculated from the equation below.
(When the internal tone filter gain = -4 dB)
CD
ONTONE
[dBm] = -G
AMP
- 40.8 + 20log(V
DD
) [dBm], CD
ONTONE
[dBV] = -G
AMP
- 49 + 20log(V
DD
) [dBV]
5
5
∗2:
BT mode is selected by setting the mode register (address = 0h) bit 2 to 1. By this setting, the gain in each dual-tone filter is raised +6
dB for adjustment to the British Telecom CD level.
Parameter
Carrier-detect sensitivity
∗
1
(input level at TPI/RING)
CAS switching characteristics
(Unless otherwise noted: V
DD
=5.0/3.0V, V
SS
=0V, f
CLK
=3.579545MHz, Ta=-20 to 70°C, CL=50pF)
Symbol
Min.
Typ.
Max.
Unit
Parameter
2.8×(N+2)+16.9
msec
CAS detect capture time
t
CASAQ
2.8×(31-N)+13.1
msec
CAS end
→
#DET rise
t
CASDH
75
80
85
msec
CAS width
t
CASW
N = TH0
×
16 + TL3
×
8 + TL2
×
4 + TL1
×
2 + TL0
t
CASW
CAS
#DET
t
CASAQ
t
CASDH
q
Call Progress Mode (CPM) Detection Circuit Characteristics
CPM AC characteristics
(Unless otherwise noted: V
DD
=5.0/3.0V, V
SS
=0V, f
CLK
=3.579545MHz, Ta=-20 to 70°C)
Parameter
Condition
Min.
Typ.
Max. Unit
Symbol
Carrier-detect ON sensitivity
∗
1
CD
ONCPM
V
DD
=5V
-44.9 -42.9 -40.9 dBm
Input amp gain (G
AMP
)=-5dB
(input level at TPI/RING)
-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
CD
OFFCPM
V
DD
=5V
Carrier-detect OFF sensitivity
∗
1
-46.9 -44.9 -42.9 dBm
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
ONCPM
and CD
OFFCPM
values (Typ.) can be calculated from the equation
below.
CD
ONCPM
[dBm] = -G
AMP
- 47.9 + 20log(V
DD
) [dBm], CD
ONCPM
[dBV] = -G
AMP
- 50.1 + 20log(V
DD
) [dBV]
5
5
CD
OFFCPM
[dBm] = -G
AMP
- 49.9 + 20log(V
DD
) [dBm], CD
OFFCPM
[dBV] = -G
AMP
- 52.1 + 20log(V
DD
) [dBV]
5
5
6
SEIKO [ SEIKO EPSON CORPORATION ]
