HC55151 datasheet(12/35 Pages) INTERSIL

12 / 35 page

4-12

Notes

2. Overload Level (Two-Wire Port, Off Hook) - The overload

level is specified at the 2-wire port (VTR) with the signal source at

the 4-wire receive port (ERX). RL = 600Ω, IDCMET ≥ 18mA.

Increase the amplitude of ERX until 1% THD is measured at VTR.

Reference Figure 1.

3. Overload Level (Two-Wire Port, On Hook) - The overload

level is specified at the 2-wire port (VTR) with the signal source at

the 4-wire receive port (ERX). RL = ∞, IDCMET = 0mA. Increase

the amplitude of ERX until 1% THD is measured at VTR.

Reference Figure 1.

4. Longitudinal Impedance - The longitudinal impedance is

computed using the following equations, where TIP and RING

voltages are referenced to ground. LZT,LZR,VT,VR,AR and AT

are deﬁned in Figure 2.

(TIP) LZT = VT/AT

(RING) LZR = VR/AR

where: EL = 1VRMS (0Hz to 100Hz)

5. Longitudinal Current Limit (On-Hook Active) - On-Hook

longitudinal current limit is determined by increasing the (60Hz)

amplitude of EL (Figure 3A) until the 2-wire longitudinal current

is greater than 28mARMS/Wire. Under this condition, SHD pin

remains low (no false detection) and the 2-wire to 4-wire

longitudinal balance is veriﬁed to be greater than 45dB

(LB2-4 = 20log VTX/EL).

6. Longitudinal Current Limit (Off-Hook Active) - Off-Hook

longitudinal current limit is determined by increasing the (60Hz)

amplitude of EL (Figure 3B) until the 2-wire longitudinal current

is greater than 28mARMS/Wire. Under this condition, SHD pin

remains high (no false detection) and the 2-wire to 4-wire

longitudinal balance is veriﬁed to be greater than 45dB

(LB2-4 = 20log VTX/EL).

7. Longitudinal to Metallic Balance - The longitudinal to

metallic balance is computed using the following equation:

BLME = 20 log (EL/VTR), where: EL and VTR are deﬁned in

Figure 4.

8. Metallic to Longitudinal FCC Part 68, Para 68.310 - The

metallic to longitudinal balance is deﬁned in this spec.

9. Longitudinal to Four-Wire Balance - The longitudinal to 4-wire

balance is computed using the following equation:

BLFE = 20 log (EL/VTX), EL and VTX are deﬁned in Figure 4.

10. Metallic to Longitudinal Balance - The metallic to longitudinal

balance is computed using the following equation:

BMLE = 20 log (ETR/VL), ERX = 0

where: ETR, VL and ERX are deﬁned in Figure 5.

11. Four-Wire to Longitudinal Balance - The 4-wire to longitudinal

balance is computed using the following equation:

BFLE = 20 log (ERX/VL), ETR = source is removed.

where: ERX, VL and ETR are deﬁned in Figure 5.

12. Two-Wire Return Loss - The 2-wire return loss is computed

using the following equation:

r = -20 log (2VM/VS) where: ZD = The desired impedance; e.g.,

the characteristic impedance of the line, nominally 600

Ω.

(Reference Figure 6).

13. Overload Level (4-Wire Port Off-Hook) - The overload level

is speciﬁed at the 4-wire transmit port (VTX) with the signal

source (EG) at the 2-wire port, ZL = 20kΩ, RL = 600Ω

(Reference Figure 7). Increase the amplitude of EG until 1%

THD is measured at VTX. Note the PTG pin is open, and the

gain from the 2-wire port to the 4-wire port is equal to 1.

14. Overload Level (4-Wire Port On-Hook) - The overload level is

speciﬁed at the 4-wire transmit port (VTX) with the signal source

(EG) at the 2-wire port, ZL = 20kΩ, RL = ∞ (Reference Figure 7).

Increase the amplitude of EG until 1% THD is measured at VTX.

Note the PTG pin is open, and the gain from the 2-wire port to

the 4-wire port is equal to 1.

15. Output Offset Voltage - The output offset voltage is speciﬁed

with the following conditions: EG =0,RL = 600Ω,ZL = ∞ and is

measured at VTX. EG,RL, VTX and ZL are deﬁned in Figure 7.

16. Two-Wire to Four-Wire Frequency Response - The 2-wire to

4-wire frequency response is measured with respect to

EG = 0dBm at 1.0kHz, ERX = 0V (VRX input floating), RL = 600Ω.

The frequency response is computed using the following equation:

F2-4 = 20 log (VTX/VTR), vary frequency from 300Hz to 3.4kHz

and compare to 1kHz reading.

VTX, VTR,RL and EG are deﬁned in Figure 8.

17. Four-Wire to Two-Wire Frequency Response - The 4-wire to 2-

wire frequency response is measured with respect to ERX = 0dBm

at 1.0kHz, EG source removed from circuit, RL = 600Ω. The

frequency response is computed using the following equation:

F4-2 = 20 log (VTR/ERX), vary frequency from 300Hz to 3.4kHz

and compare to 1kHz reading.

VTR,RL and ERX are deﬁned in Figure 8.

18. Four-Wire to Four-Wire Frequency Response - The 4-wire

to 4-wire frequency response is measured with respect to

ERX = 0dBm at 1.0kHz, EG source removed from circuit,

RL = 600Ω. The frequency response is computed using the

following equation:

F4-4 = 20 log (VTX/ERX), vary frequency from 300Hz to 3.4kHz

and compare to 1kHz reading.

VTX , RL and ERX are deﬁned in Figure 8.

19. Two-Wire to Four-Wire Insertion Loss (PTG = Open) - The

2-wire to 4-wire insertion loss is measured with respect to

EG = 0dBm at 1.0kHz input signal, ERX = 0 (VRX input floating),

RL = 600Ω and is computed using the following equation:

L2-4 = 20 log (VTX/VTR)

where: VTX, VTR,RL and EG are deﬁned in Figure 8. (Note:

The fuse resistors, RF, impact the insertion loss. The speciﬁed

insertion loss is for RF1 = RF2 = 0).

20. Two-Wire to Four-Wire Insertion Loss (PTG = AGND) - The

2-wire to 4-wire insertion loss is measured with respect to EG =

0dBm at 1.0kHz input signal, ERX = 0 (VRX input floating), RL =

600

Ω and is computed using the following equation:

L2-4 = 20 log (VTX/VTR)

where: VTX, VTR,RL and EG are deﬁned in Figure 8. (Note:

The fuse resistors, RF, impact the insertion loss. The speciﬁed

insertion loss is for RF1 = RF2 = 0).

21. Four-Wire to Two-Wire Insertion Loss - The 4-wire to 2-wire

insertion loss is measured based upon ERX = 0dBm, 1.0kHz

input signal, EG source removed from circuit, RL = 600Ω and is

computed using the following equation:

L4-2 = 20 log (VTR/ERX)

where: VTR,RL and ERX are deﬁned in Figure 8.

22. Two-Wire to Four-Wire Gain Tracking - The 2-wire to 4-wire

gain tracking is referenced to measurements taken for

EG = -10dBm, 1.0kHz signal, ERX = 0 (VRX output ﬂoating),

RL = 600Ω and is computed using the following equation.

G2-4 =20 • log (VTX/VTR) vary amplitude -40dBm to +3dBm, or

-55dBm to -40dBm and compare to -10dBm reading.

VTX,RL and VTR are deﬁned in Figure 8.

HC55120, HC55121, HC55130, HC55131, HC55140, HC55141, HC55142, HC55143, HC55150, HC55151

HC55151 Datasheet(PDF) 12 Page - Intersil Corporation

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