HC-5504B1_03 Datasheet, PDF (9/10 Pages) Intersil Corporation – ITU Low Cost, PABX SLIC With 40mA Loop Feed

HC-5504B1
Applications Diagram
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
8
DETECT DETECT
21
C₅
TIP
RD
K_1A
R_B1
1
TIP
R_{B2 9}
TIP FEED
(NOTE 5)
SLIC
HC-5504B1
RX
24
TX
20
+IN
19
C₆
C₇
R₁
Z_B
-IN
OP AMP
R₃
SUBSCRIBER
LOOP
PRIMARY
PROTEC-
TION
K_1B
V_B -
10
RING FEED
R_S2
3
RING FEED SENSE
R₂
18
OUT
C2 ¹⁷
5
C_S2
R_B4
2 NEG. BATT. DIG. ANA.
C3
22
C4
RING
PTC
R_B3
RING ^{BATT. GND. GND. GND. VB+}
+
C₄ C₃ C₂
11
12
6
23
4
C₈
C₉
+
PCM
FILTER/
CODEC
SWITCHING
NETWORK
Z₁
-48V
-48V
150V_PEAK (MAX)
RING GENERATOR
V_B+
PIN NUMBERS GIVEN FOR DIP/SOIC PACKAGE.
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 6).
C₈ = 0.01µF, 100V.
R₁ = R₂ = R₃ = 100kΩ (0.1% Match Required, 1% absolute
value) Z_B = 0 for 600Ω Terminations (Note 6).
R_B1 = R_B2 = R_B3 = R_B4 = 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.
C₉ = 0.01µF, 20V, ±20%.
Z₁ = 150V to 200V transient protection.
PTC used as ring generator ballast.
NOTES:
5. Secondary protection diode bridge recommended is a 2A, 200V type.
6. To obtain the specified transhybrid loss it is necessary for the three legs of the balance network, C₆-R₁ and R₂ and C₇-Z_B-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.
7. A 0.5µF and 100kΩ gives a time constant of 50ms. The uncommitted op amp output is internally clamped to stay within ±6.6V and is current
limited.
8. 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.
9. Application shows Ring Injected Ringing, Balanced or Tip injected configuration may be used.
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