AM79D2251JC AMD [Advanced Micro Devices], AM79D2251JC Datasheet - Page 23

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

Total Distortion Including Quantizing Distortion
Overload Compression
The signal to total distortion ratio will exceed the limits shown in Figure 10 for either path when the
input signal is a sine wave signal of frequency 1014 Hz.
Figure 11 shows the acceptable region of operation for input signal levels above the reference input
power (0 dBm0). The conditions for this figure are:
(1) 1 dB < GX +12 dB; (2) –12 dB GR < –1 dB; (3) Digital voice output connected to digital voice
input; and (4) measurement analog to analog.
Output Power
Fundamental
(dBm0)
C
D
B
-45
Figure 10. Total Distortion with Tone Input, Both Paths
2.6
-40
8
7
6
9
5
4
3
2
1
Figure 11. A/A Overload Compression
1
Fundamental Input Power (dBm0)
-30
2
Dual ISLAC Specification
3
Input Level (dBm0)
Am79D2251
4
5
6
7
Acceptable
Region
8
9
A
0
Signal-to-Total
A
B
C
D
Distortion (dB)
35.5dB
35.5dB
30dB
25dB
A-Law
35.5dB
35.5dB
31dB
27dB
µ-Law
23