AM79R70-1SC AMD [Advanced Micro Devices], AM79R70-1SC Datasheet - Page 5

• Manufacturer Part Number: AM79R70-1SC
• Description: Ringing Subscriber Line Interface Circuit
• Manufacturer: AMD [Advanced Micro Devices]

PIN DESCRIPTIONS
AGND/DGND
A(TIP)
B2EN
BGND
B(RING)
C3–C1
D1
D2
DET
E1
HPA
HPB
RD
RDC
RDCR
RINGIN
RSGH
RSGL
RSN
RTRIP1
RTRIP2
RYE
RYOUT1
RYOUT2
VBAT1
VBAT2
VCC
VNEG
VTX
Pin Names
Gnd
Output
Input
Gnd
Output
Input
Input
Input
Output
Input
Capacitor
Capacitor
Resistor
Resistor
—
Input
Input
Input
Input
Input
Input
Output
Output
Output
Battery
Battery
Power
Power
Output
Type
Analog and digital ground are connected internally to a single pin.
Output of A(TIP) power amplifier.
V
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 and E1
select the detector. Open-collector with a built-in 15 kΩ 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.
Detect resistor. Threshold modification and 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
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 resistance
all connect to this node.
Ring-trip detector. Ring-trip detector threshold set and filter pin.
Ring-trip detector threshold offset (switch to V
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 with 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 internal VEE regulator.
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.
BAT2
BAT1
BAT1
. TTL compatible.
.
enable. Logic Low enables operation from V
BAT1 and
V
BAT2
SLIC Products
.
Description
BAT1
RDC
). For power conservation in any nonringing
BAT2
is negative for normal polarity and positive
. Logic High enables operation from
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