HC55121IBZ datasheet(13/36 Pages) RENESAS

13 / 36 page

HC55120, HC55121, HC55130, HC55140, HC55142, HC55143, HC55150

FN4659 Rev 13.00

Page 13 of 36

June 1, 2006

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 = 600, 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



(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 = 20kRL = 600

(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 = 20k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 = 600, 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 = 600.

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 = 600. 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 =600. 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 = 600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

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 = 600 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 = 600 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.

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