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參數(shù)資料
| 型號： | AM79514 |
| 廠商： | Advanced Micro Devices, Inc. |
| 英文描述： | Subscriber Line Interface Circuit |
| 中文描述： | 用戶線接口電路 |
| 文件頁數(shù)： | 4/18頁 |
| 文件大?。?/td> | 786K |
| 代理商： | AM79514 |
4
Am79514 Data Sheet
PIN DESCRIPTIONS
Pin Names
Type
Description
AGND
Gnd
Analog 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
Inputs
Decoder. TTL compatible. C3
is MSB and C1 is LSB.
Test relay driver command. TTL compatible. A logic High enables the driver.
C4
Input
DGND
Gnd
Digital ground.
CHCLK
Input
Chopper clock. Input to switching regulator (TTL compatible) Frequency = 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. When enabled, a logic Low indicates that the selected detector is tripped. The detector
is selected by the logic inputs (C3
–
C1 and E1). The output is open-collector with a built-in 15 k
pull-up resistor.
E0
Input
Read enable. A logic High enables DET. A logic Low disables DET.
E1
Input
Ground key enable. 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.
This pin will have up to 60 V of pulse waveform on it and must be isolated from sensitive circuits.
Extreme care must be taken to keep the diode connections short because of the high currents and
high di/dt.
QBAT
Battery
Quiet battery. Filtered battery supply for the signal processing circuits. An external 100
, 1/8
resistor must be connected between QBAT and VBAT pins.
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. The other end
of the network connects to the receiver summing node (RSN). The sign of V
RDC
is negative for nor-
mal polarity and positive for reverse polarity.
RINGOUT
Output
Ring relay driver. Sourcing from BGND with internal diode to QBAT.
RSN
Input
Receive summing node. The metallic current (both AC and DC) between A(TIP) and B(RING) is
equal to 1000 times the current into this pin. The networks that program receive gain, two-wire
impedance, and feed current all connect to this node. This node is extremely sensitive. Care should
be taken to route the 256-kHz chopper clock and switch lines away from the RSN node.
TESTOUT
Output
Test relay driver. Sourcing from BGND with internal diode to QBAT.
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.
TP
Thermal
VBAT
Battery
Battery Supply.
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. This output is a unity gain version of the A(TIP) and B(RING) metallic voltage. The
other end of the two-wire input impedance programming network connects here.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| AM79514-1JC | 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:Subscriber Line Interface Circuit |
| AM79514-1PC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telecommunication IC |
| AM79514-2DC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telecommunication IC |
| AM79514-2JC | 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:Subscriber Line Interface Circuit |
| AM79530-1DC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Subscriber Line Interface Circuit |
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