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參數(shù)資料
| 型號： | AM79M535 |
| 廠商： | Advanced Micro Devices, Inc. |
| 英文描述： | Metering Subscriber Line Interface Circuit |
| 中文描述： | 計量用戶線接口電路 |
| 文件頁數(shù)： | 4/18頁 |
| 文件大?。?/td> | 172K |
| 代理商： | AM79M535 |
4
Am79M535 Data Sheet
PIN DESCRIPTIONS
Pin Names
Type
Description
AGND
Gnd
Analog (quiet) ground
DGND
Gnd
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.
CHCLK
Input
Chopper Clock. Input to switching regulator (TTL compatible). Freq = 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, 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.
E0
Input
Read Enable. A logic Low disables DET. A logic High enables DET.
E1
Input
Ground-Key Enable. When E0 is High, E1 = High connects the ground-key detector to
DET, and E1 = Low connects the off-hook or ring-trip detector to DET.
GKFIL
Capacitor
Ground-Key Filter Capacitor Connection. An external capacitor for filtering out high-
frequency noise from the ground-key loop can be connected to this pin. An internal
36 k
–
20%, +40% resistor is provided to form an RC filter with the external capacitor.
In versions which have a GKFIL pin, a 3.3 nF minimum capacitance must be
connected from the GKFIL pin to ground.
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. 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
QBAT
Battery
Quiet Battery. Filtered battery supply for the signal processing circuits.
RD
Resistor
Detector 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. Sourcing from BGND with internal diode to Q
BAT
.
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 current all connect to this node. This node is extremely sensitive. Route the 256 kHz
chopper clock and switch lines away from the RSN node.
RSN
Input
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
Connected to office battery supply through an external protection diode.
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 0.510 times the A(TIP) and B(RING) metallic voltage. VTX
also sources the two-wire input impedance programming network.
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