HC-5502B Datasheet, PDF (9/9 Pages) Intersil Corporation – EIA/ITU PABX SLIC with 30mA Loop Feed

Applications Diagram
HC-5502B
Z₁
12V
PTC
RING GENERATOR
150V_PEAK (MAX)
TIP
R_S
SYSTEM CONTROLLER
RING
RELAY
R_B1
C_S
R_B2
15
13
14
7
16
POWER SWITCH GROUND RING RING
DENIAL HOOK KEY SYNC CMD
8 _RD
DETECT DETECT _RECEIVE 21
1
TIP
9
TIP FEED
24
TRANSMIT
SLIC
HC-5502B
20
+IN
19
OP AMP ^-IN
18
OUT
BALANCE NETWORK
C₅
C₆
C₇
ZB
R₁
R₃
R₂
PCM
FILTER/
CODEC
SWITCHING
NETWORK
V_B-
SUBSCRIBER
LOOP
PRIMARY
PROTECTION
R_B4
RING
R_B3
10
RING FEED
4
C1
17
C2
2
RING
5
C3
C4 ²²
NEG. BATT. DIG. ANA. POS.
BATT. GND. GND. GND. SUPP.
C₄ C₃ C₂ C₁
11
12
6
23
3
C₈
-48V
C₉
V_B+
FIGURE 1. TYPICAL LINE CIRCUIT APPLICATION WITH THE MONOLITHIC SLIC
Typical Component Values
C₁ = 0.5µF (Note 6).
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 7), 20V.
C₈ = 0.01µF, 100V.
C₉ = 0.01µF, 20V, ±20%.
R₁ = R₂ = R₃ = 100kΩ (0.1% Match Required, 1% absolute
value), ZB = 0 for 600Ω Terminations (Note 7).
R_B1 = R_B2 = R_B3 = R_B4 = 150Ω (0.1% Match Required, 1%
absolute value).
R_S = 1kΩ, C_S = 0.1µF, 200V typically, depending on V_RING
and line length.
Z₁ = 150V to 200V transient protection. PTC used as ring
generator ballast.
NOTES:
6. C₁ is an optional capacitor used to improve V_B+ supply rejection. This pin must be left open if unused.
7. 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 im-
pedance 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 Fil-
ter/CODEC.
A 0.5µF and 100kΩ 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.
8. Secondary protection diode bridge recommended is a 2A, 200V type.
9. 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.
10. Pin numbers given for DIP/SOIC package.
55