AM79212JC AMD (ADVANCED MICRO DEVICES), AM79212JC Datasheet - Page 11

• Manufacturer Part Number: AM79212JC
• Manufacturer: AMD (ADVANCED MICRO DEVICES)

Specifications of AM79212JC

• Lead Free Status / RoHS Status: Supplier Unconfirmed

IREF
Current Reference (Input)
An external resistor (RREF) connected between this pin
and analog ground generates an accurate on-chip
reference current. This current is used by the ASLAC
device in its DC Feed and loop-supervision circuits.
IRTA, IRTB
Ring-Trip Sense (Inputs)
These pins are current summing nodes referenced to
VREF. They provide terminations for external resistors
RSR1 and RSR2 that sense the voltages on both sides
of the ringing-feed resistor connected to the ring bus.
To determine the ringing current in the loop, the ASLAC
device finds the difference between the currents in these
pins.
ISUM
Metallic Sense (Input)
ISUM is a current input pin and is fed by the ISUM pin of
the ASLIC device. The current in this pin is used by the
ASLAC device for supervisory and diagnostic functions.
O1
Control Port (Output)
This output port is TTL compatible and is controlled by
the O1 bit (bit 2) in the downstream C/I channel. It can
control an external logic device or it can be connected
to pin C3, C4, or C5 of the ASLIC device to control relays.
RST
Reset (Input)
A logic 1 on this pin resets the ASLAC device to initial
default conditions. A signal less than 100 ns in duration
should not cause a reset. To ensure proper reset, the
minimum length of a reset pulse is 50 µs.
S0, S1, S2
GCI Channel Identification Straps (Input)
When the input pins are individually strapped to VCC or
DGND, the ASLAC device can be coded to
communicate with one of the eight GCI channels within
a frame.
P R E L I M I N A R Y
ASLIC/ASLAC Products
VCCA
Analog Power Supply
VCCA is internally connected to substrate near the
analog I/O section.
VCCD
Digital Power Supply
VCCD is internally connected to substrate near the
digital section.
VIN
Analog Input (Input)
The analog output (VTX) from the ASLIC device is
applied to the ASLAC device transmit path input, VIN.
The signal is sampled, processed, encoded, and placed
on the upstream GCI port.
VINM
Inversion of Analog Input (Output)
An inverted version of the analog input voltage on VIN
appears on this pin.
VLBIAS
Longitudinal Reference (Output)
VLBIAS is programmed by VOFF and supplies the
longitudinal reference voltage for the longitudinal
control loop to the ASLIC device.
VM
12 kHz or 16 kHz Metering Signal (Output)
For 12 kHz or 16 kHz teletax, an internally generated
and shaped 12 kHz or 16 kHz sine wave metering pulse
is output from this pin.
VOUT
Analog Output (Output)
The voice data from the downstream GCI port, B1
channel, is digitally processed and converted to an
analog signal that is sent out of the VOUT pin to the
ASLIC device.
VREF
Analog Reference (Output)
This pin provides a voltage reference to be used as the
analog zero-level reference on the ASLIC device.
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