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AM79R70 Datenblatt(PDF) 5 Page - Advanced Micro Devices

Teilenummer AM79R70
Bauteilbeschribung  Ringing Subscriber Line Interface Circuit
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Hersteller  AMD [Advanced Micro Devices]
Direct Link  http://www.amd.com
Logo AMD - Advanced Micro Devices

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SLIC Products
5
PIN DESCRIPTIONS
Pin Names
Type
Description
AGND/DGND
Gnd
Analog and digital ground are connected internally to a single pin.
A(TIP)
Output
Output of A(TIP) power amplifier.
B2EN
Input
VBAT2 enable. Logic Low enables operation from VBAT2. Logic High enables operation from
VBAT1. TTL compatible.
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.
D1
Input
Relay1 control. TTL compatible. Logic Low activates the Relay1 relay driver.
D2
Input
(Option) Relay2 control. TTL compatible. Logic Low activates the Relay2 relay driver.
DET
Output
Detector. Logic Low indicates that the selected detector is tripped. Logic inputs C3–C1 and E1
select the detector. Open-collector with a built-in 15 k
Ω pull-up resistor.
E1
Input
(Option) A logic High selects the off-hook detector. A logic Low selects the ground-key detector.
TTL compatible.
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.
RD
Resistor
Detect 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.
RDCR
Connection point for feedback during ringing.
RINGIN
Input
Ring Signal Input. Pin for ring signal input. Square-wave shaped by external RC filter. Requires
50% duty cycle. CMOS-compatible input.
RSGH
Input
Saturation Guard High. Pin for resistor to adjust Open Circuit voltage when operating from
VBAT1.
RSGL
Input
Saturation Guard Low. Pin for resistor to adjust the anti-saturation cut-in voltage when operating
from both VBAT1 and VBAT2.
RSN
Input
The metallic current (AC and DC) between A(TIP) and B(RING) is equal to 1000 x the current
into this pin. The networks that program receive gain, two-wire impedance, and feed resistance
all connect to this node.
RTRIP1
Input
Ring-trip detector. Ring-trip detector threshold set and filter pin.
RTRIP2
Input
Ring-trip detector threshold offset (switch to VBAT1). For power conservation in any nonringing
state, this switch is open.
RYE
Output
Common Emitter of RYOUT1/RYOUT2. Emitter output of RYOUT1 and RYOUT2. Normally
connected to relay ground.
RYOUT1
Output
Relay/switch driver. Open-collector driver with emitter internally connected to RYE.
RYOUT2
Output
(Option) Relay/switch driver. Open-collector driver with emitter internally connected to RYE.
VBAT1
Battery
Battery supply and connection to substrate.
VBAT2
Battery
Power supply to output amplifiers. Connect to off-hook battery through a diode.
VCC
Power
Positive analog power supply.
VNEG
Power
Negative analog power supply. This pin is the return for the internal VEE regulator.
VTX
Output
Transmit Audio. This output is a 0.5066 gain version of the A(TIP) and B(RING) metallic AC volt-
age. VTX also sources the two-wire input impedance programming network.


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