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AM79574JC Datasheet(PDF) 4 Page - Advanced Micro Devices

Part # AM79574JC
Description  Subscriber Line Interface Circuit
Download  17 Pages
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Manufacturer  AMD [Advanced Micro Devices]
Direct Link  http://www.amd.com
Logo AMD - Advanced Micro Devices

AM79574JC Datasheet(HTML) 4 Page - Advanced Micro Devices

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4
Am79574 Data Sheet
PIN DESCRIPTIONS
Pin Names
Type
Description
AGND
Gnd
Analog (quiet) ground
A(TIP)
Output
Output of A(TIP) power amplifier
BGND
Gnd
Battery (power) ground
B(RING)
Output
Output of B(RING) power amplifier
C3–C1
Input
Decoder. TTL compatible. C3 is MSB and C1 is LSB.
C4
Input
Test relay driver command. TTL compatible. Logic Low enables the driver.
CHCLK
Input
Chopper clock. Input to switching regulator (TTL compatible). Freq = 256 kHz (Nominal).
CHS
Input
Chopper stabilization. Connection for external stabilization components.
DA
Input
Ring-trip negative. Negative input to ring-trip comparator.
DB
Input
Ring-trip positive. Positive input to ring-trip comparator.
DET
Output
Detector. Logic Low indicates that the selected detector is tripped. Logic inputs C3–C1, E1, and E0
select the detector. Open-collector with a built-in 15 k
Ω pull-up resistor.
DGND
Gnd
Digital ground
E0
Input
A logic High enables DET. A logic Low disables DET.
E1
Input
E1 = High connects the ground-key detector to DET, and E1 = Low connects the off-hook or ring-trip
detector to DET.
HPA
Capacitor High-pass filter capacitor. A(TIP) side of high-pass filter capacitor.
HPB
Capacitor High-pass filter capacitor. B(RING) side of high-pass filter capacitor.
L
Output
Switching Regulator Power Transistor. Connection point for filter inductor and anode of catch diode.
Has up to 60 V of pulse waveform on it and must be isolated from sensitive circuits. Keep the diode
connections short because of the high currents and high di/dt.
QBAT
Battery
Filtered battery supply for the signal processing circuits.
RD
Resistor
Detector resistor. Threshold modification and filter point for the off-hook detector.
RDC
Resistor
DC feed resistor. Connection point for the DC feed current programming network, which also
connects to the Receiver Summing Node (RSN). VRDC is negative for normal polarity and positive
for reverse polarity.
RINGOUT
Output
Ring relay driver. Sourcing from BGND with internal diode to QBAT.
RSN
Input
The metallic current (AC and DC) between A(TIP) and B(RING) = 1000 x the current into this pin. The
networks that program receive gain, two-wire impedance, and feed resistance all connect to this
node. This node is extremely sensitive. Route the 256 kHz chopper clock and switch lines away from
the RSN node.
TESTOUT
Output
Test relay driver. Source from BGND with internal diode to QBAT.
TP
Thermal
Thermal pin. Connection for heat dissipation. Internally connected to substrate (QBAT). Leave as
open circuit or connected to QBAT. In both cases, the TP pins can connect to an area of copper on
the board to enhance heat dissipation.
VBAT
Battery
Battery supply. Connected through an external protection diode.
VCC
Power
+5 V power supply.
VEE
Power
–5 V power supply.
VREG
Input
Regulated voltage. Provides negative power supply for power amplifiers, connection point for
inductor, filter capacitor, and chopper stabilization.
VTX
Output
Transmit Audio. Unity gain version of the A(TIP) and B(RING) metallic voltage. VTX also sources the
two-wire input impedance programming network.


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