Sharp FO IS125N - B/W Laser - All-in-One Service Manual page 111

5) Modem circuit (BLOCK E)
The control of the FAX communication by IC1000 (CX95110).
The detection of CI signal, and the line monitor signal is mode.
(Example: Fax signal send)
PDIB_N
PDIB_P
Digital
Isolation
Barrier
(DIB)
SDIB_N
SDIB_P
Host Side Device
MODEM
CX95110
TELLINEMUTE
TELMUTE
SDAA_PWM
DELSIG
BLOCK E
CI
BZOUT
Fax Engine
SPMUTE
Controller
CX95410
CX20548 LSD GPIO DC Electrical Characteristics
Parameter
Input Voltage
Input Voltage Low
Input Voltage High
Output Voltage Low
Output Voltage High
Input Leakage Current
Output Leakage Current (High Impedance)
GPIO Output Sink Current at 0.33 V maximum
GPIO Output Source Current at 2.97 V minimum
GPIO Rise Time/Fall Time
Test Conditions unless otherwise stated: DVDD = +3.3V +5%; TA = 0°C to 70°C; external load = 50 pF
BLOCK B
RAC
Line Side
Device
TAC
CX20548-11Z
DIODE
BRIDGE
RXI
EIO
TXO
AGND_LSD
TAC
Line Side
Device
CX20548-12Z
EIO
L.P.F.
Gain
L.P.F.
Fig. 7
Symbol
V
IN
V
IL
V
IH
V
OL
V
OH
-
-
-
-
5 – 20
BLOCK A
SURGE
PROTECTION
TEL.LIN
CIRCUIT
AGND_LSD
ACTIVE
CHOKE
AGND_LSD
HANDSET
MIC IN
HANDSET
SPEAKER OUT
ADG
BLOCK C
Speaker
Amp
SPEAKER
BLOCK D
Min. Typ. Max.
-0.30 - 3.465
- - 1.0
1.6 - -
0 - 0.33
2.97 - -
-10 - 10
-10 - 10
2.4 - -
2.4 - -
20 100
FO-IS125N
Analog
TX/RX
TX
RX
Digital
Units Test Conditions
V DVDD = +3.465V
V
V
V
V
µA
µA
mA
mA
ns