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參數(shù)資料
| 型號： | AM79R79 |
| 廠商： | Advanced Micro Devices, Inc. |
| 英文描述： | Ringing Subscriber Line Interface Circuit |
| 中文描述： | 振鈴用戶線接口電路 |
| 文件頁數(shù)： | 5/20頁 |
| 文件大小： | 361K |
| 代理商： | AM79R79 |
SLIC Products
5
PIN DESCRIPTIONS
Pin Names
Type
Description
AGND/DGND
Gnd
Analog and Digital ground
A(TIP)
Output
Output of A(TIP) power amplifier
B2EN
Input
VBAT2 Enable. Logic Low enables operation from V
BAT2
. Logic High enables operation
from V
BAT1
. TTL compatible.
Battery (power) ground
BGND
Gnd
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
Switchhook 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
pull-up resistor.
E1
Input
(Option) Ground-Key Enable. 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
Detector resistor. Detector threshold set and filter pin.
RDC
Resistor
DC feed resistor. Connection point for the DC feed current programming network, which
also connects to the receiver summing node (RSN). V
RDC
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
V
BAT1
.
Saturation Guard Low. Pin for resistor to adjust the anti-saturation cut-in voltage when
operating from both V
BAT1 and
V
BAT2
.
Receive Summing Node. 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.
RSGL
Input
RSN
Input
RTRIP1
Input
Ring-trip detector. Ring-trip detector threshold set and filter pin.
RTRIP2
Input
Ring-trip detector. Ring-trip detector threshold offset (switch to V
BAT1
). 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 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 intern VEE regulator.
VTX
Output
Transmit Audio. This output is 0.5066 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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