HC5523 Datasheet, PDF (15/18 Pages) Intersil Corporation – LSSGR/TR57 CO/Loop Carrier SLIC with Low Power Standby

HC5523
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:
I_L = [|V_BAT| - 3] / [R_L +1800], T_A = 25^oC
29. Ground Key Detector - (TRIGGER) Increase the input current
to 8mA and verify that DET goes low.
(RESET) Decrease the input current from 17mA to 3mA and verify
that DET goes high.
(Hysteresis) Compare difference between trigger and reset.
30. Power Supply Rejection Ratio - Inject a 100mV_RMS signal
(50Hz to 4kHz) on V_BAT, V_CC and V_EE supplies. PSRR is com-
puted using the following equation:
PSRR = 20 • log (V_TX/V_IN). V_TX and V_IN are defined in Figure 12.
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