AM79D2251JC AMD [Advanced Micro Devices], AM79D2251JC Datasheet - Page 25

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

Spurious Out-of-Band Signals at the Analog Output
With PCM code words representing a sine wave signal in the range of 300 Hz to 3400 Hz at a level of 0 dBm0 applied
to the digital input, the level of the spurious out-of-band signals at the analog output is less than the limits shown below.
With code words representing any sine wave signal in the range 3.4 kHz to 4.0 kHz at a level of 0 dBm0 applied to
the digital input, the level of the signals at the analog output are below the limits in Figure 13. The amplitude of the
spurious out-of-band signals between 3400 Hz and 4600 Hz is given by the formula:
Level (dBm0)
–50
–30
–10
–20
–40
0
Figure 13. Spurious Out-of-Band Signals
40 kHz to 240 kHz
240 kHz to 1 MHz
4.6 kHz to 40 kHz
A
Frequency
=
3.4
–
14
–
Am79D2251
14
sin
4.0
--------------------------- - dBm0
Frequency (kHz)
f 4000
1200
–
4.6
ISLAC Device Specification
–32 dBm0
–46 dBm0
–36 dBm0
–28 dB
Level
–32 dB
19256A-013
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