L9214G Просмотр технического описания (PDF) - Agere -> LSI Corporation
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L9214G Datasheet PDF : 46 Pages
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Preliminary Data Sheet
October 2001
L9214A/G
Low-Cost Ringing SLIC
Pin Information (continued)
Table 1. Pin Descriptions (continued)
28-Pin
SOG
16
32-Pin
PLCC
20
48-Pin
MLCC
23
Symbol
TRGDET
17
21
24
ICM
18
22
25
FB2
19
23
26
FB1
20
24
29
PT
21
25
31
PR
22
26
33
B3
23
27
34
B2
24
28
35
B1
25
29
36
B0
26
30
38
ITR
27
31
40
VTX
28
32
41
TXI
Type
Name/Function
O Tip/Ring Ground Detect. When high, this open collector
output indicates the presence of a ring ground or a tip
ground. This supervision output may be used in ground
key or common-mode fault detection applications.
I Common-Mode Current Sense. To program tip or ring
ground sense threshold, connect a resistor to VCC and
connect a capacitor to AGND to filter 50/60 Hz. If unused,
the pin is connected to ground.
— Polarity Reversal Slowdown Capacitor. Connect a
capacitor from this node for controlling rate of battery
reversal. Also used for ringing, this pin cannot be left
open.
— Polarity Reversal Slowdown Capacitor. Connect a
capacitor from this node for controlling rate of battery
reversal. Also used for ringing, this pin cannot be left
open.
I/O Protected Tip. The input to the loop sensing circuit and
output drive of the tip amplifier. Connect to loop through
overvoltage and overcurrent protection.
I/O Protected Ring. The input to the loop sensing circuit and
output drive of the ring amplifier. Connect to loop through
overvoltage and overcurrent protection.
I State Control Input.
I State Control Input.
I State Control Input.
I State Control Input.
I Transmit Gain. Input to AX amplifier. Connect a resistor
from this node to VTX to set transmit gain. Gain shaping
for termination impedance with a COMBO I codec is also
achieved with a network from this node to VTX.
O ac/dc Output Voltage. Output of internal AX amplifier.
The voltage at this pin is directly proportional to the differ-
ential tip/ring current.
I ac/dc Separation. Input to internal AAC amplifier. Con-
nect a 0.1 µF capacitor from this pin to VTX.
Agere Systems Inc.
11
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