am79r70 Advanced Micro Devices, am79r70 Datasheet - Page 5

• Manufacturer Part Number: am79r70
• Description: Ringing Subscriber Line Interface Circuit
• Manufacturer: Advanced Micro Devices

PIN DESCRIPTIONS
AGND/DGND
Pin Names
RYOUT1
RYOUT2
B(RING)
RINGIN
RTRIP1
RTRIP2
C3–C1
VBAT1
VBAT2
A(TIP)
BGND
RDCR
RSGH
VNEG
VREG
RSGL
B2EN
RDC
HPA
HPB
RSN
RYE
VCC
DET
VTX
RD
D1
D2
E1
Capacitor
Capacitor
Resistor
Resistor
Battery
Battery
Output
Output
Output
Output
Output
Output
Output
Type
Power
Power
Inputs
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Gnd
Gnd
—
Analog and Digital ground are connected internally to a single pin.
Output of A(TIP) power amplifier.
VBAT2 Enable. Logic Low enables operation from V
from V
Battery (power) ground.
Output of B(RING) power amplifier.
Decoder. TTL compatible. C3 is MSB and C1 is LSB.
Relay1 Control. TTL compatible. Logic Low activates the Relay1 relay driver.
(Option) Relay2 Control. TTL compatible. Logic Low activates the Relay2 relay driver.
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 pull-up resistor.
(Option) A logic High selects the off-hook detector. A logic Low selects the ground-key
detector. TTL compatible.
High-pass filter capacitor; A(TIP) side of high-pass filter capacitor.
High-pass filter capacitor; B(RING) side of high-pass filter capacitor.
Detector resistor. Threshold modification/filter point for the off-hook detector.
DC feed resistor. Connection point for the DC feed current programming network, which
also connects to the receiver summing node (RSN). V
and positive for reverse polarity.
Connection point for feedback during ringing.
Ring Signal Input. Pin for ring signal input. Square-wave shaped by external RC filter.
Requires 50% duty cycle. CMOS-compatible input.
Saturation Guard High. Pin for resistor to adjust Open Circuit voltage when operating
from V
Saturation Guard Low. Pin for resistor to adjust the anti-saturation cut-in voltage when
operating from both V
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 current all connect to this node.
Ring-trip detector. Ring-trip detector threshold set and filter pin.
Ring-trip detector threshold offset (switch to V
nonringing state, this switch is open.
Common Emitter of RYOUT1/RYOUT2. Emitter output of RYOUT1 and RYOUT2.
Normally connected to relay ground.
Relay/switch driver. Open collector driver with emitter internally connected to RYE.
(Option) Relay/switch driver. Open collector driver emitter internally connected to RYE.
Battery supply and connection to substrate.
Power supply to output amplifiers. Connect to off-hook battery through a diode.
Positive analog power supply.
Negative analog power supply. This pin is the return for the intern VEE regulator.
Regulated Voltage. Provides negative power supply for power amplifiers, connection
point for inductor, filter capacitor, and chopper stabilization.
Transmit Audio. This output is 0.5066 times the A(TIP) and B(RING) metallic voltage.
VTX also sources the two-wire input impedance programming network.
BAT1
BAT1
P R E L I M I N A R Y
. TTL compatible.
.
SLIC Products
BAT1 and
V
BAT2
.
Description
BAT1
). For power conservation in any
BAT2
RDC
. Logic High enables operation
is negative for normal polarity
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