LE58QL022BVC datasheet(16/61 Pages) ZARLINK

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Le58QL022

Data Sheet

Zarlink Semiconductor Inc.

Discrimination Against Out-of-Band Input Signals

When an out-of-band sine wave signal of frequency f, and level A is applied to the analog input, there may be frequency

components below 4 kHz at the digital output which are caused by the out-of-band signal. These components are at least the

specified dB level below the level of a signal at the same output originating from a 1014 Hz sine wave signal with a level of A

dBm0 also applied to the analog input. The minimum specifications are shown in the following table.

Figure 7.

Discrimination Against Out-of-Band Signals

Note:

The attenuation of the waveform below amplitude A, between 3400 Hz and 4600 Hz, is given by the formula:

Discrimination Against 12- and 16-kHz Metering Signals

If the QLSLAC device is used in a metering application where 12 kHz or 16 kHz tone bursts are injected onto the telephone line

toward the subscriber, a portion of these tones also may appear at the VIN terminal. These out-of-band signals may cause

frequency components to appear below 4 kHz at the digital output. For a 12 kHz or 16 kHz tone, the frequency components below

4 kHz are reduced from the input by at least 70 dB. The sum of the peak metering and signal voltages must be within the analog

input voltage range.

Frequency of Out-of-Band Signal

Amplitude of Out-of-Band Signal

Level below A

16.6 Hz < f < 45 Hz

–25 dBm0 < A

≤ 0 dBm0

18 dB

45 Hz < f < 65 Hz

–25 dBm0 < A

≤ 0 dBm0

25 dB

65 Hz < f < 100 Hz

–25 dBm0 < A

≤ 0 dBm0

10 dB

3400 Hz < f < 4600 Hz

–25 dBm0 < A

≤ 0 dBm0

see Figure 7

4600 Hz < f < 100 kHz

–25 dBm0 < A

≤ 0 dBm0

32 dB

-10

-20

-30

-40

Level below

A (dB)

-50

3.4

4.0

4.6

Frequency (kHz)

-28 dB

-32 dB

Attenuation (db)

π 4000 f

–

()

1200

-----------------------------

⎝⎠

⎛⎞

sin

–

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