HC5515_06 Datasheet, PDF (15/20 Pages) Intersil Corporation – ITU CO/PABX SLIC with Low Power Standby

HC5515
SLIC Operating States
E0
C1
C2
0
0
0
0
0
1
0
1
0
0
1
1
TABLE 1. LOGIC TRUTH TABLE
SLIC OPERATING STATE
ACTIVE DETECTOR
Open Circuit
No Active Detector
Active
Loop Current Detector
Ringing
Ring Trip Detector
Standby
Loop Current Detector
DET OUTPUT
Logic Level High
Loop Current Status
Ring Trip Status
Loop Current Status
1
0
0
Open Circuit
1
0
1
Active
1
1
0
Ringing
1
1
1
Standby
Notes
2. Overload Level (Two-Wire port) - The overload level is
specified at the 2-wire port (V_TR0) with the signal source at the
4-wire receive port (E_RX). I_DCMET = 30mA, R_SG = 4kΩ,
increase the amplitude of E_RX until 1% THD is measured at
V_TRO. Reference Figure 1.
3. Longitudinal Impedance - The longitudinal impedance is
computed using the following equations, where TIP and RING
voltages are referenced to ground. L_ZT, L_ZR, V_T, V_R, A_R and
A_T are defined in Figure 2.
(TIP) L_ZT = V_T/A_T,
(RING) L_ZR = V_R/A_R,
where: E_L = 1V_RMS (0Hz to 100Hz).
4. Longitudinal Current Limit (Off-Hook Active) - Off-Hook
(Active, C₁ = 1, C₂ = 0) longitudinal current limit is determined
by increasing the amplitude of E_L (Figure 3A) until the 2-wire
longitudinal balance drops below 45dB. DET pin remains low
(no false detection).
5. Longitudinal Current Limit (On-Hook Standby) - On-Hook
(Active, C₁ = 1, C₂ = 1) longitudinal current limit is determined
by increasing the amplitude of E_L (Figure 3B) until the 2-wire
longitudinal balance drops below 45dB. DET pin remains high
(no false detection).
6. Longitudinal to Metallic Balance - The longitudinal to metallic
balance is computed using the following equation:
BLME = 20 • log (E_L/V_TR), where: E_L and V_TR are defined in
Figure 4.
7. Metallic to Longitudinal FCC Part 68, Para 68.310 - The
metallic to longitudinal balance is defined in this spec.
8. Longitudinal to Four-Wire Balance - The longitudinal to 4-wire
balance is computed using the following equation:
BLFE = 20 • log (E_L/V_TX),: E_L and V_TX are defined in Figure 4.
9. Metallic to Longitudinal Balance - The metallic to
longitudinal balance is computed using the following equation:
BMLE = 20 • log (E_TR/V_L), E_RX = 0,
where: E_TR, V_L and E_RX are defined in Figure 5.
10. Four-Wire to Longitudinal Balance - The 4-wire to longitudinal
balance is computed using the following equation:
No Active Detector
Loop Current Detector
Ring Trip Detector
Loop Current Detector
Logic Level High
BFLE = 20 • log (E_RX/V_L), E_TR = source is removed.
where: E_RX, V_L and E_TR are defined in Figure 5.
11. Two-Wire Return Loss - The 2-wire return loss is computed
using the following equation:
r = -20 • log (2V_M/V_S).
where: Z_D = The desired impedance; e.g., the characteristic
impedance of the line, nominally 600Ω. (Reference Figure 6).
12. Overload Level (4-Wire port) - The overload level is specified
at the 4-wire transmit port (V_TXO) with the signal source (E_G) at
the 2-wire port, I_DCMET = 23mA, Z_L = 20kΩ, R_SG = 4kΩ (Refer-
ence Figure 7). Increase the amplitude of E_G until 1% THD is
measured at V_TXO. Note that the gain from the 2-wire port to
the 4-wire port is equal to 1.
13. Output Offset Voltage - The output offset voltage is specified
with the following conditions: E_G = 0, I_DCMET = 23mA, Z_L = ∞
and is measured at V_TX. E_G, I_DCMET, V_TX and Z_L are defined
in Figure 7. Note: I_DCMET is established with a series 600Ω
resistor between tip and ring.
14. Two-Wire to Four-Wire (Metallic to V_TX) Voltage Gain - The
2-wire to 4-wire (metallic to V_TX) voltage gain is computed
using the following equation.
G_2-4 = (V_TX/V_TR), E_G = 0dBm0, V_TX, V_TR, and E_G are defined
in Figure 7.
15. Current Gain RSN to Metallic - The current gain RSN to
Metallic is computed using the following equation:
K = I_M [(R_DC1 + R_DC2)/(V_RDC - V_RSN)] K, I_M, R_DC1, R_DC2,
V_RDC and V_RSN are defined in Figure 8.
16. Two-Wire to Four-Wire Frequency Response - The 2-wire to
4-wire frequency response is measured with respect to
E_G = 0dBm at 1.0kHz, E_RX = 0V, I_DCMET = 23mA. The
frequency response is computed using the following equation:
F_2-4 = 20 • log (V_TX/V_TR), vary frequency from 300Hz to
3.4kHz and compare to 1kHz reading.
V_TX, V_TR, and E_G are defined in Figure 9.
17. Four-Wire to Two-Wire Frequency Response - The 4-wire to
2-wire frequency response is measured with respect to
E_RX = 0dBm at 1.0kHz, E_G = 0V, I_DCMET = 23mA. The
frequency response is computed using the following equation:
F_4-2 = 20 • log (V_TR/E_RX), vary frequency from 300Hz to
15
FN4235.6
June 6, 2006