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參數(shù)資料
| 型號： | T7507 |
| 元件分類： | Codec |
| 英文描述： | T7507 Quad PCM Codec with Filters, Termination Impedance, and Hybrid Balance |
| 中文描述： | T7507四路PCM編解碼器與過濾器，終端阻抗，以及混合平衡 |
| 文件頁數(shù)： | 6/30頁 |
| 文件大?。?/td> | 558K |
| 代理商： | T7507 |
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6
Lucent Technologies Inc.
Data Sheet
August 1999
Termination Impedance, and Hybrid Balance
T7507 Quad PCM Codec with Filters,
Pin Information
(continued)
Table 1. Pin Descriptions
(continued)
Pin
7
Symbol
NTSD
C
Type
I
Name/Function
Not Thermal Shutdown Status Input—L8567 SLIC.
Logic level status input from L8567
SLIC indicating if SLIC is in thermal shutdown or normal device operation. This input is
accepted from the latched parallel data output of the SLIC and outputted on the serial
data output bus DO to the microcontroller. This pin is meant to be a shared output among
the four channels associated with the quad T7507, using the EN control to determine
valid data among the four channels.
Not Loop Closure/Not Ring Trip Status Input.
Logic level status input from L8567
SLIC indicating loop on-/off-hook status. This input is accepted from the latched parallel
data output of the SLIC and outputted on the serial data output bus DO to the microcon-
troller. This pin is meant to be a shared output among the four channels associated with
the quad T7507, using the EN control to determine valid data among the four channels.
SLIC State Control.
These logic level outputs control the state of the L8567 SLIC. These
pins are meant to be a shared output among the four channels associated with the quad
T7507, using the EN control to determine valid data among the four channels.
Driver Control.
These logic level outputs control the state of an electromechanical relay
driver on the L8567 SLIC or a solid-state relay contact on the L7583 via the L7583 logic
control inputs. These pins are meant to be a shared output among the four channels
associated with the quad T7507, using the EN control to determine valid data among the
four channels.
5 V Analog Power Supplies
. Both pins must be connected on the circuit board.
Each pin should be bypassed to ground with at least 0.1 μF of capacitance as close to
the device as possible.
Voice Frequency Transmitter Input.
Analog inverting input to the noninverting opera-
tional amplifier at the transmit filter input. Connect the signal to be digitized to this pin
through a capacitor C
I
(see Figure 3).
8
NSTAT
C
I
9
10
B1c
B0c
O
11
12
13
RD3
C
RD2
C
RD1
C
O
14
31
V
DD
—
22
15
24
30
21
16
23
29
20
17
25
28
19
18
26
27
39
38
36
37
VF
X
IN3
VF
X
IN2
VF
X
IN1
VF
X
IN0
AGND3
AGND2
AGND1
AGND0
VF
R
ON3
VF
R
ON2
VF
R
ON1
VF
R
ON0
VF
R
OP3
VF
R
OP2
VF
R
OP1
VF
R
OP0
NTSD0
NTSD1
NTSD2
NTSD3
I
—
Analog Grounds.
All ground pins must be connected on the circuit board.
O
Voice Frequency Receiver Negative Output.
This pin can drive 2000
(or greater)
loads.
O
Voice Frequency Receive Positive Output.
This pin can drive 2000
(or greater)
loads.
I
Not Thermal Shutdown Status Input—L7583 Switch.
Logic level status input from
L7583 solid-state switch indicating if switch is in thermal shutdown or normal device
operation. This input is accepted on a per-line basis from the four switches associated
with the quad T7507, and outputted on the serial data output bus DO to the microcontrol-
ler. If unused, tie to ground or 5 V.
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