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參數(shù)資料
| 型號： | AM7945 |
| 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 |
| 文件大小： | 157K |
| 代理商： | AM7945 |
4
Am7945 Data Sheet
PIN DESCRIPTIONS
Pin Names
Type
Description
AGND/DGND
Gnd
Analog and digital 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
Input
Decoder. TTL compatible. C3 is MSB and C1 is LSB.
CAS
Capacitor
Anti-saturation pin for capacitor to filter reference voltage when operating in anti-saturation
region.
DA
Input
Ring-Trip Negative. Negative input to ring-trip comparator.
DB
Input
Ring-Trip Positive. Positive input to ring-trip comparator.
DET
Output
Switchhook Detector. When enabled, a logic Low indicates the selected detector is tripped.
The detect condition is selected by the logic inputs (C3
–
C1, E0, E1). The output is open-
collector with a built-in 15 k
pull-up resistor.
E0
Input
Ground-Key Enable. A logic High enables DET. A logic Low disables DET (PLCC only).
E1
Input
Ground-Key Enable. E1 = Low connects the ground-key or ring-trip detector to DET. E1 =
High connects the off-hook or ring-trip detector to DET (PLCC only).
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
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). V
RDC
is negative
for normal polarity and positive for reverse polarity.
RINGOUT
Output
Ring Relay Driver. Open-collector driver with emitter internally connected to BGND.
RSN
Input
Receive Summing Node. The metallic current (both AC and DC) between A(TIP) and
B(RING) is equal to 200 times the current into this pin. Networks that program receive gain,
two-wire impedance, and feed resistance all connect to this node.
TMG
—
Thermal Management. Connect an external resistor between this pin and the VBAT pin to
reduce on-chip power dissipation in the normal polarity, Active state only. See Table 2.
TP
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.
VBAT
Battery
Battery supply
VCC
Power
+5 V power supply
VEE
Power
–
5 V power supply
VTX
Output
Transmit Audio. This output is a unity 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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| AM7946-2JC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telecommunication IC |
| AM7946-3JC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Subscriber Line Interface Circuit |
| AM7946-4JC | 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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