AM79D2251JC AMD [Advanced Micro Devices], AM79D2251JC Datasheet - Page 20

• Manufacturer Part Number: AM79D2251JC
• Description: Dual Intelligent Subscriber Line Audio-Processing Circuit (ISLAC)
• Manufacturer: AMD [Advanced Micro Devices]

Attenuation Distortion
Group Delay Distortion
20
The attenuation of the signal in either path is nominally independent of the frequency. The deviations
from nominal attenuation will stay within the limits shown in Figure 6. The reference frequency is
1014 Hz and the signal level is –10 dBm0.
Minimum transmit attenuation at 60 Hz is 24 dB
For either transmission path, the group delay distortion is within the limits shown in
Figure 7. The minimum value of the group delay is taken as the reference. The signal level should
be –10 dBm0.
Delay (µS)
-0.125
0.125
0.6
2
1
0
0
150
420
Figure 6. Transmit and Receive Path Attenuation vs. Frequency
90
0
Receive path
Figure 7. Group Delay Distortion
Dual ISLAC Specification
Frequency (Hz)
Dual ISLAC Specification
(Either Path)
Am79D2251
Frequency (Hz)
0.65
0.2
0.80