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| 型號： | HC-5502X |
| 廠商： | Intersil Corporation |
| 英文描述： | () |
| 中文描述： | （） |
| 文件頁數(shù)： | 7/17頁 |
| 文件大小： | 255K |
| 代理商： | HC-5502X |
4-7
Typical Component Values
C
1
= 0.5
μ
F (Note 1).
C
2
= 0.15
μ
F, 10V.
C
3
= 0.3
μ
F, 30V.
C
4
= 0.5
μ
F to 1.0
μ
F, 10%, 20V (Should be Nonpolarized).
C
5
= 0.5
μ
F, 20V.
C
6
= C
7
= 0.5
μ
F (10% Match Required) (Note 2), 20V.
C
8
= 0.01
μ
F, 100V.
C
9
= 0.01
μ
F, 20V, 20%.
NOTES:
1. C
1
is an optional capacitor used to improve V
B
+ supply rejection. This pin must be left open if unused.
2. To obtain the specified transhybrid loss it is necessary for the three legs of the balance network, C
6
-R
1
and R
2
and C
7
-Z
B
-R
3
, to match in
impedance to within 0.3%. Thus, if C
6
and C
7
are 1
μ
F each, a 20% match is adequate. It should be noted that the transmit output to C
6
sees
a -22V step when the loop is closed. Too large a value for C
6
may produce an excessively long transient at the op amp output to the PCM
Filter/CODEC.
3. A 0.5
μ
F and 100k
gives a time constant of 50ms. The uncommitted op amp output is internally clamped to stay within
±
5.5V and also has
current limiting protection.
4. Secondary protection diode bridge recommended is a 2A, 200V type.
5. All grounds (AG, BG, and DG) must be applied before V
B
+ or V
B
-. Failure to do so may result in premature failure of the part. If a user wishes
to run separate grounds off a line card, the AG must be applied first.
R
1
= R
2
= R
3
= 100k
(0.1% Match Required, 1% absolute
value), ZB = 0 for 600
Terminations (Note 2).
RB1 = RB2 = RB3 = RB4 = 150
(0.1% Match Required, 1%
absolute value).
R
S
= 1k
, C
S
= 0.1
μ
F, 200V typically, depending on V
RING
and
line length.
Z
1
= 150V to 200V transient protection. PTC used as ring
generator ballast.
FIGURE 8. HC-5502X LINE APPLICATION CIRCUIT
PRIMARY
PRO-
TECTION
RING FEED
RING
8
1
9
10
2
TIP FEED
TIP
RD
OP AMP
RECEIVE
TRANSMIT
+IN
-IN
OUT
C2
C3
C4
NEG.
BATT.
BATT.
GND.
DIG.
GND.
ANA.
GND.
POWER
DENIAL
SWITCH
HOOK
DETECT
GROUND
KEY
DETECT
RING
SYNC
RING
CMD
C1
C
6
R
1
R
2
C
7
C
5
R
3
BALANCE NETWORK
PCM
FILTER/
CODEC
SWITCHING
NETWORK
ZB
C
4
C
3
C
2
C
1
23
C
9
3
V
B
+
POS.
SUPP.
6
12
11
C8
-48V
Z
1
PTC
12V
RING
RELAY
R
B1
R
B2
V
B
-
R
B4
RING
R
B3
R
S
C
S
TIP
SUBSCRIBER
LOOP
150V PEAK (MAX)
RING GENERATOR
SYSTEM CONTROLLER
15
13
14
7
16
21
24
20
19
18
4
17
5
22
(NOTE3
PIN NUMBERS GIVEN FOR DIP/SOIC PACKAGE.
Application Note 549
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