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參數(shù)資料
| 型號： | L7585G |
| 英文描述： | Full-Feature,Low-Power SLIC and Switch |
| 中文描述： | 全功能，低功耗SLIC和開關 |
| 文件頁數(shù)： | 6/22頁 |
| 文件大小： | 446K |
| 代理商： | L7585G |
6
Agere Communications Inc.
Data Sheet
September 2001
L7585G Full-Feature, Low-Power SLIC and Switch
Pin Information
(continued)
Table 1. Pin Descriptions
(continued)
Note: On the printed-wiring board (PWB), make the leads to BGND and V
BAT
as wide as possible for thermal and electrical reasons. Also, max-
imize the amount of PWB copper on all leads connected to this device for the lowest operating temperature.
Pin Symbol
22
23
24
25
26
27
28
DGND
29
30
BGND
31
Type
I
I
I
I
I
—
—
—
—
I
Name/Function
B4
B3
B2
B1
B0
V
CCD
Bit 4.
B0—B5 determine the state of the SLIC. See Operating States.
Bit 3.
B0—B5 determine the state of the SLIC. See Operating States.
Bit 2.
B0—B5 determine the state of the SLIC. See Operating States.
Bit 1.
B0—B5 determine the state of the SLIC. See Operating States.
Bit 0.
B0—B5 determine the state of the SLIC. See Operating States.
+5 V Digital dc Supply.
+5 V supply for logic and switch circuitry.
Digital Ground.
Ground return for V
CCD
.
Battery Supply.
Negative high-voltage power supply.
Battery Ground.
Ground return for the battery (V
BAT
) supply.
Tip/Ring Current.
A current output which is proportional to the differential current flowing
from tip to ring. Connect a resistor from this pin to VITR.
Tip/Ring Voltage Output.
The voltage at this output is directly proportional to the differ-
ential tip/ring current. A resistor from this pin to ITR sets the gain.
Transmit ac Input.
Connect a 0.1 μF capacitor from this pin to VITR.
Transmit ac Output Voltage.
The ac voltage at this output is 7.2 times the ac voltage at
pin TXI. The dc voltage is equal to the dc voltage on pin VRTX.
Transmit ac Reference Voltage.
The dc voltage at this output (2.4 V nominal) is the dc
reference for the transmit signal output VTX.
Receive ac Signal Input (Noninverting).
This high-impedance input controls the ac dif-
ferential voltage on tip and ring.
Receive ac Signal Input (Inverting).
This high-impedance input controls the ac differen-
tial voltage on tip and ring.
Analog Ground.
Ground return for V
CCA
.
+5 V Analog dc Supply.
+5 V supply for analog circuitry.
Loop Closure Threshold Input.
Connect a resistor to DC
OUT
to set the off-hook thresh-
old.
Current-Limit Program Input.
A resistor to DC
OUT
sets the dc current limit.
dc Output.
This output is a voltage that is directly proportional to the differential
tip/ring current.
dc Resistance.
Ground for dc feed resistance of 180
, or short to DC
OUT
for 600
. In-
termediate values can be set with a resistor divider from DC
OUT
to ground, the tap of which
is connected to DCR.
Filter Capacitor 2.
Connect a 0.1 μF, 100 V capacitor from this pin to AGND and a
0.22 μF, 100 V capacitor from this pin to pin CF1.
V
BAT
ITR
32
VITR
O
33
34
TXI
VTX
I
O
35
VRTX
O
36
RCVP
I
37
RCVN
I
38
39
40
AGND
V
CCA
LCTH
—
—
I
41
42
I
PROG
DC
OUT
I
O
43
DCR
I
44
CF2
I/O
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