18 / 44 page
18
Am79Q4457/5457 Data Sheet
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.
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 5
4600 Hz < f < 100 kHz
–25 dBm0 < A
≤ 0 dBm0
32 dB
0
–10
–20
–30
–40
–50
Frequency (kHz)
3.4
4.0
4.6
–32 dB, –25 dBm0 < input < 0 dBm0
QSLAC-NP Device Specification
Level (dB)
20013A-012
–28 dBm
Note:
The attenuation of the waveform below amplitude A between 3400 Hz and 4600 Hz is
given by the formula:
Attenuation (db)
14
14
π 4000 f
–
()
1200
--------------------------
sin
–
=
Figure 5. Discrimination against Out-of-Band Signals
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
