參數(shù)資料
型號(hào)： HC5520CM
廠商： Harris Corporation
英文描述： CO/PABX Polarity Reversal Subscriber Line Interface Circuit
中文描述： 二氧化碳/極性反轉(zhuǎn)交換機(jī)用戶線接口電路
文件頁(yè)數(shù)： 8/20頁(yè)
文件大小： 191K
代理商： HC5520CM
8
K
ZO
Pin -
The 2-wire impedance that is synthesized by the
HC5520 is a direct function of the network connected to this
pin (see equations). Parasitic capacitance and inductance
from the PC board layout and the external components is
magnified by the same K factor that is utilized to synthesize
the 2-wire impedance. Excessive parasitics can cause inser-
tion loss and return loss degradation, especially at higher
voice band frequencies. Good PC board layout techniques
and proper component selection can minimize these effects
to a negligible level.
R
N
Pin -
This pin connects an external resistor to the input
of an internal buffer. The value of this resistor is user speci-
fied based upon the impedance desired at the 2-wire inter-
face (see equations). The value chosen must not have a
value greater than 7k
or the input voltage range of the
buffer may be exceeded during transients.
R
DC
Pin -
An external resistor connected to V
CC
is required
at this pin to provide an accurate reference for the DC cur-
rents which feed the subscriber loop. PC board traces
should be made to have low resistance and should connect
directly to V
CC
.
C
DC
Pin -
This pin provides a connection to the DC refer-
ence nodes that control the DC loop feed current. These
internal blocks are referenced to V
EE
and it is important that
the capacitor be referenced to V
EE
or else the PSRR perfor-
mance will be degraded.
C
P
Pin -
Capacitor C
P
connects to this pin to create a low-
pass filter for the half-battery internal reference point. It is
important that this capacitor be referenced to BGND/AGND
to minimize the effect of noise injected into the subscriber
loop from the battery supply.
R
PSG
, R
PST
, R
PSR
, R
PSB
Pins -
These pins are connected
to critical nodes inside the HC5519R3931 feedback control
loops. Parasitic capacitance should be minimized in order to
prevent oscillations.
RD, TB, TA Pins -
The pins connect to the driver coils of the
Ring and Test relays and activate the relays by pulling down
the coil voltage to ground. The driver outputs are internally
clamped to V
CC
by diodes to prevent the inductive voltage
transient during relay turn-off from damaging the driver.
Relays attached to any voltage other than V
CC
will not func-
tion properly.
I
RX
TIP
RING
Z
L
V
TR
E
G
I
L
R
4W
V
TX
R
X
V
RX
HC5520
R
RGS
R
TPS
A = 400
I
RS
I
TS
A2
R
N
Z
KZO
I
KZO
I
RS
2x
I
RX
I
KZO
I
KZO
I
TS
I
RS
I
TS
+
-
A = 400
+
-
+
-
A1
+
-
+
-
FIGURE 2. SIMPLIFIED AC TRANSMISSION CIRCUIT
TIP
TIPSEN
RING
RINGSEN
R
100k
R
PT
50
R
PR
50
R
RGS
100k
R
X
TIP
RING
HC5520
T
X
600
R
X
100k
100k
C
VRX
0.47
μ
F
C
VTX
0.47
μ
F
V
RX
V
TX
50k
100k
100k
+
-
T
X
4
W
R
4W
VOICE INPUT
AMPLIFIER
50k
0.47
μ
F
62pF
FIGURE 3. TRANSHYBRID BALANCE CIRCUIT WITH HIGH AND LOW FREQUENCY COMPENSATION
HC5520
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