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AM79C02

Dual Subscriber Line Audio Processing Circuit (DSLAC™) Devices

Advanced Micro Devices 

Discrimination against Out-of-Band Input Signals

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

frequency components below 4 kHz at the digital output, 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 Figure 5.

Frequency of Out-of-Band Signal

16.6 Hz < f < 45 Hz

45 Hz < f < 65 Hz

65 Hz < f < 100 Hz

3400 Hz < f < 4600 Hz

4600 Hz < f < 100 kHz

Amplitude of Out-of-Band Signal

–25 dBm0 < A ≤ 0 dBm0

–25 dBm0 < A ≤ 0 dBm0

–25 dBm0 < A ≤ 0 dBm0

–25 dBm0 < A ≤ 0 dBm0

–25 dBm0 < A ≤ 0 dBm0

Level below A

18 dB

25 dB

10 dB

see Figure 5

32 dB

0

–10

–20

Level (dB)

–30

–40

–50

DSLAC Device Specification

–28 dBm

–32 dB, –25 dBm0 < input < 0 dBm0

3.4

4.0

4.6

Frequency (kHz)

09875H-009

Note:

The attenuation of the waveform below amplitude A between 3400 Hz

and 4600 Hz is given by the formula:

Attenuation (dB) = 14 – 14 sin π----(---4---0---0---0----–-----f--)

1200

Figure 5. Discrimination against Out-of-Band Signals

14

Am79C02/03/031(A) Data Sheet

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