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參數(shù)資料
| 型號： | AM79574 |
| 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)： | 4/17頁 |
| 文件大?。?/td> | 162K |
| 代理商： | AM79574 |
4
Am79574 Data Sheet
PIN DESCRIPTIONS
Pin Names
AGND
A(TIP)
BGND
B(RING)
C3
–
C1
C4
CHCLK
CHS
DA
DB
DET
Type
Gnd
Output
Gnd
Output
Input
Input
Input
Input
Input
Input
Output
Description
Analog (quiet) ground
Output of A(TIP) power amplifier
Battery (power) ground
Output of B(RING) power amplifier
Decoder. TTL compatible. C3 is MSB and C1 is LSB.
Test relay driver command. TTL compatible. Logic Low enables the driver.
Chopper clock. Input to switching regulator (TTL compatible). Freq = 256 kHz (Nominal).
Chopper stabilization. Connection for external stabilization components.
Ring-trip negative. Negative input to ring-trip comparator.
Ring-trip positive. Positive input to ring-trip comparator.
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.
Digital ground
A logic High enables DET. A logic Low disables DET.
E1 = High connects the ground-key detector to DET, and E1 = Low connects the off-hook or ring-trip
detector to DET.
Capacitor High-pass filter capacitor. A(TIP) side of high-pass filter capacitor.
Capacitor High-pass filter capacitor. B(RING) side of high-pass filter capacitor.
Output
Switching Regulator Power Transistor. Connection point for filter inductor and anode of catch diode.
Has up to 60 V of pulse waveform on it and must be isolated from sensitive circuits. Keep the diode
connections short because of the high currents and high di/dt.
Battery
Filtered battery supply for the signal processing circuits.
Resistor
Detector resistor. Threshold modification and filter point for the off-hook detector.
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.
Output
Ring relay driver. Sourcing from BGND with internal diode to QBAT.
Input
The metallic current (AC and DC) between A(TIP) and B(RING) = 1000 x the current into this pin. The
networks that program receive gain, two-wire impedance, and feed resistance all connect to this
node. This node is extremely sensitive. Route the 256 kHz chopper clock and switch lines away from
the RSN node.
Output
Test relay driver. Source from BGND with internal diode to QBAT.
Thermal
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.
Battery
Battery supply. Connected through an external protection diode.
Power
+5 V power supply.
Power
–
5 V power supply.
Input
Regulated voltage. Provides negative power supply for power amplifiers, connection point for
inductor, filter capacitor, and chopper stabilization.
Output
Transmit Audio. Unity gain version of the A(TIP) and B(RING) metallic voltage. VTX also sources the
two-wire input impedance programming network.
DGND
E0
E1
Gnd
Input
Input
HPA
HPB
L
QBAT
RD
RDC
RINGOUT
RSN
TESTOUT
TP
VBAT
VCC
VEE
VREG
VTX
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AM79574-1JC | 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:Subscriber Line Interface Circuit |
| AM79574-2JC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telecommunication IC |
| AM79574JC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Subscriber Line Interface Circuit |
| AM79578-1JC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telecommunication IC |
| AM79578-2JC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telecommunication IC |
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