HC5515 Datasheet, PDF (14/17 Pages) Intersil Corporation – ITU CO/PABX SLIC with Low Power Standby

HC5515
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 longitudi-
nal 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:
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 fre-
quency 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
3.4kHz and compare to 1kHz reading.
V_TR and E_RX are defined in Figure 9.
18. Four-Wire to Four-Wire Frequency Response - The 4-wire
to 4-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_4-4 = 20 • log (V_TX/E_RX), vary frequency from 300Hz to
3.4kHz and compare to 1kHz reading.
V_TX and E_RX are defined in Figure 9.
19. Two-Wire to Four-Wire Insertion Loss - The 2-wire to 4-wire
insertion loss is measured with respect to E_G = 0dBm at 1.0kHz
input signal, E_RX = 0, I_DCMET = 23mA and is computed using
the following equation:
L_2-4 = 20 • log (V_TX/V_TR)
where: V_TX, V_TR, and E_G are defined in Figure 9. (Note: The
fuse resistors, R_F, impact the insertion loss. The specified
insertion loss is for R_F = 0).
20. Four-Wire to Two-Wire Insertion Loss - The 4-wire to 2-wire
insertion loss is measured based upon E_RX = 0dBm, 1.0kHz
input signal, E_G = 0, I_DCMET = 23mA and is computed using
the following equation:
L_4-2 = 20 • log (V_TR/E_RX),
where: V_TR and E_RX are defined in Figure 9.
21. Two-Wire to Four-Wire Gain Tracking - The 2-wire to 4-wire
gain tracking is referenced to measurements taken for
E_G = -10dBm, 1.0kHz signal, E_RX = 0, I_DCMET = 23mA and is
computed using the following equation.
G_2-4 = 20 • log (V_TX/V_TR) vary amplitude -40dBm to +3dBm, or
-55dBm to -40dBm and compare to -10dBm reading.
V_TX and V_TR are defined in Figure 9.
22. Four-Wire to Two-Wire Gain Tracking - The 4-wire to 2-wire
gain tracking is referenced to measurements taken for
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