T7507 Quad PCM Codec with Filters,
Termination Impedance, and Hybrid Balance
Data Sheet
August 1999
Pin Information (continued)
Table 1. Pin Descriptions (continued)
Pin Symbol Type
Name/Function
7
NTSDC
I
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.
8
NSTATC
I
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.
9
10
B1c
B0c
O
O
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.
11
12
13
RD3C
RD2C
RD1C
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.
14
31
VDD
—
I
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.
22
15
24
30
VFXIN3
VFXIN2
VFXIN1
VFXIN0
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 CI (see Figure 3).
21
16
23
29
AGND3
AGND2
AGND1
AGND0
—
O
O
I
Analog Grounds. All ground pins must be connected on the circuit board.
20 VFRON3
17 VFRON2
25 VFRON1
28 VFRON0
Voice Frequency Receiver Negative Output. This pin can drive 2000 Ω (or greater)
loads.
19 VFROP3
18 VFROP2
26 VFROP1
27 VFROP0
Voice Frequency Receive Positive Output. This pin can drive 2000 Ω (or greater)
loads.
39
38
36
37
NTSD0
NTSD1
NTSD2
NTSD3
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.
6
Lucent Technologies Inc.
AGERE [ AGERE SYSTEMS ]
