FO-IS125N
5 – 21
CX20548 (IC1100, IC1200) Terminal description
Pin Name
Pin No.
Pin I/O
I/O Type
Signal Description
System Interface Signals
PWR
15
PWR
PWR
Unregulated Power Output.
Unregulated power output
from the internal rectifier, connect to AGND_LSD through
C870.
VC
3
REF
REF
Output Middle Reference Voltage.
Connect to
AGND_LSD through C844, which must be placed close to
pin 3. Use a short path and a wide trace to AGND_LSD pin.
AVDD
2
PWR
PWR
Analog Power Output.
Provides external connection point
for decoupling. (AVDD is routed internally to LSD analog
circuits.). Connect to AGND_LSD through C828. C828
must be placed close to pins 2.
DVDD
1
PWR
PWR
Digital Power Output.
Provides external connection point
for decoupling. Connect to AGND_LSD through C830.
Place C830 near pin 1.
PADDLE (AGND)
17
AGND_LSD
AGND_LSD
Paddle Analog Ground.
The conductive surface located
on the bottom of the package is connected internally to
device analog ground. Connect to AGND_LSD.
DIB Interface Signals
DIBP
14
I/O
I/O
DIB Positive.
Positive terminal of DIB, connect to second-
ary of DIB transformer.
DIBN
16
I/O
I/O
DIB Negative.
Negative terminal of DIB, connect to sec-
ondary of DIB transformer.
TIP and RING Interface Signals
RAC, TAC
4, 5
I, I
Ia, a
RING DC Coupled and TIP DC Coupled.
Un-rectified volt-
age from telephone line used to detect ring.
Connect RAC to the diode bridge DC node (RING) through
R802 (connects to pin 4).
Connect TAC to the diode bridge DC node (TIP) through
R804 (connects to pin 5).
EIC
11
O
Oa
Electronic Inductor Capacitor.
Electronic inductor filtering
capacitor. Connect to AGND_LSD through C858.
EIO 10
O
Oa
Electronic Inductor Output.
Calculated voltage is applied
to this output to control off-hook and DC VI mask operation.
Connect to base of Q804.
EIF
9
I
Ia
Electronic Inductor Feedback.
Connect to emitter of
Q804 through R826.
RXI
6
I
Ia
Receive Analog Input.
Receiver operational amplifier
inverting input. AC coupled to the Bridge_CC node through
R810 (connects to pin 6) and C810 in series. R810 and
C810 must be placed very close to pin 6. The length of the
PCB trace connecting R810 to the RXI pin must be kept at
an absolute minimum.
TXO
8
O
Oa
Transmit Output.
Outputs transmit signal and impedance
matching signal; connect to base of transistor Q802.
TXF
7
I
Ia
Transmit Feedback.
Connect to emitter of transistor Q802
Not Used
GPIO
1
I/O
It/Ot12
General Purpose I/O.
Leave open if not used.
Notes:
1. I/O types*:
Ia Analog input
It Digital input*
Oa Analog output
Ot12 Digital output*
AGND_LSD Isolated LSD Analog Ground (isolated from the host system ground)
*See CX20548 LSD GPIO DC Electrical Characteristics. (Page 5-20).
2. Refer to applicable reference design for exact component placement and values.
Содержание FO IS125N - B/W Laser - All-in-One
Страница 106: ...FO IS125N 5 15 Table 3 LAN Interface Signals Table 4 Serial EEPROM Interface Signals ...
Страница 107: ...FO IS125N 5 16 Table 5 System and Power Signals 1 2 ...
Страница 108: ...FO IS125N 5 17 Table 5 System and Power Signals 2 2 Note 1 Note 1 Note 1 Note 1 ...
Страница 135: ...FO IS125N 6 14 14 Control PWB parts layout Top side F300 The CONTROL PWB of the model employs lead free solder ...
