AM79C2031JC AMD (ADVANCED MICRO DEVICES), AM79C2031JC Datasheet - Page 9

• Manufacturer Part Number: AM79C2031JC
• Manufacturer: AMD (ADVANCED MICRO DEVICES)

Specifications of AM79C2031JC

• Lead Free Status / RoHS Status: Supplier Unconfirmed

PIN DESCRIPTIONS
ASLIC Device
AD, BD
A and B Line Drivers (Output)
These pins provide the currents to the A and B leads
of the subscriber loop.
BAL1
Pre-balance (Input)
This pin receives voltages that are added to the VTX
output signal. They can be used to cancel out the
metering echo in the transmit path.
BGND
Battery Ground
This pin connects to the ground return for Central
Office or talk battery.
C2–C1
ASLIC Device Control (Input)
These ternary logic input pins control the operating
state of the ASLIC device.
C5–C3
Test Relay Control (Input)
These are control inputs for the test relay drivers in the
ASLIC device. A logic Low turns on the relay driver and
activates the relay. C3 controls RY1OUT, C4 controls
RY2OUT, and C5 controls RY3OUT.
GND
Ground
Analog and digital ground return for VCC.
HPA, HPB
High-Pass Filter Capacitor Connections
These pins connect to CHP, the external high-pass
filter capacitor that isolates the DC control loop from
the voice transmission path.
IDC
DC Loop Control Current (Input)
The DC loop current control line from the ASLAC
device is connected to this pin. An internal resistance
is provided between the IDC pin and RSN. An external
noise filter capacitor should be connected between this
pin and VREF.
IDIF
A – B Leg Current (Output)
The current at this pin is proportional to the difference
of the currents flowing out of the AD pin and into the
BD pin of the ASLIC device.
P R E L I M I N A R Y
ASLIC/ASLAC Products
ISUM
A + B Leg Current (Output)
The current at this pin is proportional to the absolute
value of the sum of the currents flowing out of the AD
pin and into the BD pin of the ASLIC device.
QBAT
Quiet Battery Voltage (Power)
The QBAT pin is connected to the substrate.
RINGOUT, RY1OUT, RY2OUT, RY3OUT
Relay Drivers (Output)
These are open collector, high current relay driver
outputs with emitters internally connected to BGND.
To absorb the inductive pulse from the relay coils, an
internal Zener diode is connected between the
collector of each driver and BGND.
RSN
Receive Summing Node (Input)
The metallic current (both AC and DC) between AD
and BD is equal to ASLIC device current gain, K1,
times the current into this pin. Networks that program
receive gain and two-wire impedance connect to this
node. This input is nominally at VREF potential.
RSVD
Reserved (Input)
This is used during AMD testing. In the application, this
pin must be floating.
SA, SB
A and B Lead Voltage Sense (Input)
These pins sense the voltages on the line side of the
fuse resistors at the A and B leads. External sense
resistors, RSA and RSB, are required to protect these
pins from lightning or power cross conditions.
TMG
Thermal Management
A resistor connected from this pin to VBAT reduces the
on-chip power dissipation by absorbing excess power
from the ASLIC device for short-loop conditions.
VBAT
Battery Voltage (Power)
This pin supplies battery voltage to the line drivers.
VCC
Power Supply (Power)
This is the positive supply for low voltage analog and
digital circuits in the ASLIC device.
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