AM79Q4457J ETC1 [List of Unclassifed Manufacturers], AM79Q4457J Datasheet - Page 18

• Manufacturer Part Number: AM79Q4457J
• Description: Quad Subscriber Line Audio Processing Circuit-Non-Programmable (QSLAC-NP) Devices
• Manufacturer: ETC1 [List of Unclassifed Manufacturers]

Discrimination against Out-of-Band Input Signals
When an out-of-band sine wave signal with frequency and level A is applied to the analog input, there may be fre-
quency 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.
18
Note:
The attenuation of the waveform below amplitude A between 3400 Hz and 4600 Hz is
given by the formula:
Attenuation (db)
Frequency of Out-of-Band Signal
3400 Hz < f < 4600 Hz
4600 Hz < f < 100 kHz
16.6 Hz < f < 45 Hz
65 Hz < f < 100 Hz
45 Hz < f < 65 Hz
Level (dB)
=
14
–
14
sin
–10
–40
–20
–30
–50
--------------------------
Figure 5. Discrimination against Out-of-Band Signals
0
4000 f –
1200
3.4
Amplitude of Out-of-Band Signal
Am79Q4457/5457 Data Sheet
–25 dBm0 < A
–25 dBm0 < A
–25 dBm0 < A
–25 dBm0 < A
–25 dBm0 < A
4.0
Frequency (kHz)
4.6
QSLAC-NP Device Specification
0 dBm0
0 dBm0
0 dBm0
0 dBm0
0 dBm0
–32 dB, –25 dBm0 < input < 0 dBm0
–28 dBm
Level below A
see Figure 5
18 dB
25 dB
10 dB
32 dB
20013A-012