HC5523_03 Datasheet, PDF (16/22 Pages) Intersil Corporation – LSSGR/TR57 CO/Loop Carrier SLIC with Low Power Standby

HC5523
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 metal-
lic 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 longitudi-
nal 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 com-
puted 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 E_RX =
-10dBm, 1.0kHz signal, E_G = 0, I_DCMET = 23mA and is com-
puted using the following equation:
G_4-2 = 20 • log (V_TR/E_RX) vary amplitude -40dBm to +3dBm, or
-55dBm to -40dBm and compare to -10dBm reading.
V_TR and E_RX are defined in Figure 9. The level is specified at
the 4-wire receive port and referenced to a 600Ω impedance
level.
23. Two-Wire Idle Channel Noise - The 2-wire idle channel noise
at V_TR is specified with the 2-wire port terminated in 600Ω (R_L)
and with the 4-wire receive port grounded (Reference Figure
10).
24. Four-Wire Idle Channel Noise - The 4-wire idle channel noise
at V_TX is specified with the 2-wire port terminated in 600Ω (R_L).
The noise specification is with respect to a 600Ω impedance
level at V_TX. The 4-wire receive port is grounded (Reference
Figure 10).
25. Harmonic Distortion (2-Wire to 4-Wire) - The harmonic dis-
tortion is measured with the following conditions. E_G = 0dBm at
1kHz, I_DCMET = 23mA. Measurement taken at V_TX. (Reference
Figure 7).
26. Harmonic Distortion (4-Wire to 2-Wire) - The harmonic dis-
tortion is measured with the following conditions. E_RX = 0dBm0.
Vary frequency between 300Hz and 3.4kHz, I_DCMET = 23mA.
Measurement taken at V_TR. (Reference Figure 9).
27. Constant Loop Current - The constant loop current is calcu-
lated using the following equation:
I_L = 2500 / (R_DC1 + R_DC2)
28. Standby State Loop Current - The standby state loop current
is calculated using the following equation:
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