HC-5504DLC Datasheet, PDF (8/9 Pages) Intersil Corporation – SLIC Subscriber Line Interface Circuit

Applications Diagram
HC-5504DLC
+5V TO
+12V
SYSTEM CONTROLLER
15
13
14
7 16
R_S1 CS1
K1 POWER SWITCH GROUND RING RING
BALANCE NETWORK
DENIAL HOOK KEY SYNC CMD
TIP
K1A RB1
8
RD
1
TIP
DETECT DETECT
21
RX
24
TX
C5
C6 _C7
RB2 ₉
TIP FEED
SLIC
20
+IN
ZB
R1
1
HC-5504DLC
19
-IN
OP AMP
R3
SUBSCRIBER
LOOP
PRIMARY
PROTEC-
TION
K1B
R_S2
C_S2
RING
PTC
RB3
V_B -
10
RING FEED
3
RING FEED SENSE
RB4
2
RING
NEG. BATT.
BATT. GND.
11
12
C8
DIG.
GND.
6
ANA.
GND.
23
R2
18
OUT
C2 ¹⁷
5
C3
22
C4
V_B+
4
C9
+
C4 C3 C2
+
PCM
FILTER/
CODEC
SWITCHING
NETWORK
-48V
V_B +
Z₁
150V PEAK (MAX)
RING GENERATOR
-48V
FIGURE 1. TYPICAL LINE CIRCUIT APPLICATION WITH THE MONOLITHIC SLIC
Typical Component Values
C2 = 0.15µF, 10V
C3 = 0.3µF, 30V
C4 = 0.5µF to 1.0µF, 10%, 20V (Should be nonpolarized)
C5 = 0.5µF, 20V
C6 = C7 = 0.5µF (10% Match Required) (Note 2)
C8 = 0.01µF, 100V
C9 = 0.01µF, 20V, ±20%
R1 = R2 = R3 = 100k (0.1% Match Required, 1% absolute
value) ZB = 0 for 600Ω Terminations (Note 2)
RB₁ = RB₂ = RB₃ = RB₄ = 150Ω (0.1% Match Required, 1%
absolute value)
R_S1 = R_S2 =1kΩ, typically.
C_S1 = C_S2 = 0.1µF, 200V typically, depending on V_RING and
line length.
Z₁ = 150V to 200V transient protection.
PTC used as ring generator ballast.
NOTES:
1. Secondary protection diode bridge recommended is a 2A, 200V type.
2. To obtain the specified transhybrid loss it is necessary for the three legs of the balance network, C6-R1 and R2 and C7-ZB-R3, to match
in impedance to within 0.3%. Thus, if C6 and C7 are 1µF each, a 20% match is adequate. It should be noted that the transmit output to
C6 sees a -22V step when the loop is closed. Too large a value for C6 may produce an excessively long transient at the op amp output
to the PCM Filter/CODEC.
A 0.5µF and 100kΩ gives a time constant of 50msec. The uncommitted op amp output is internally clamped to stay within ±5.5V and
also has current limiting protection.
3. All grounds (AG, BG, & 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.
4. To prevent saturation of longitudinal amplifier during ringing, the ringer current should be limited to less than 30mA peak.
5. Application shows Ring injected ringing, a Balanced or Tip injected configuration may be used.
6. Pin numbers given for DIP/SOIC package.
Additional information is contained in Application Note 549, “The HC-550X Telephone SLICs’’ By Geoff Phillips
8-26