am79q02 ETC-unknow, am79q02 Datasheet - Page 17

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am79q02

Manufacturer Part Number
am79q02
Description
Quad Subscriber Line Audio-processing Circuit Qslac Devices
Manufacturer
ETC-unknow
Datasheet

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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
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.
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
Frequency of Out-of-Band Signal
Level (dB)
–10
–20
–30
–40
–50
0
Figure 5. 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:
Attenuation (db)
x x x x x x x x
x x x x x x x x
x x x x x x x x
x x x x x x x x
x x x x x x x x
x x x x x x x x
x x x x x x x x
x x x x x x x x x x x x x x x
3.4
–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
Amplitude of Out-of-Band Signal
=
x x x x x x x
x x x x x x x
x x x x x x x
x x x x x x x
x x x x x x x
x x x x x x x
14
SLAC Products
4.0
Frequency (kHz)
14
sin
x x
x x
π
------------------------- -
x x x x x x x x x x x x
x x x x x x x x x x x x
x x x x x x x x x x x x
x x x x x x x x x x x x
(
4000 f
1200
4.6
–28 dBm
QSLAC Device Specification
–32 dB, –25 dBm0 < input < 0 dBm0
)
Level below A
see Figure 5
18 dB
25 dB
10 dB
32 dB
19256A-012
17

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