am79d2251 Advanced Micro Devices, am79d2251 Datasheet - Page 25

Manufacturer Part Number

am79d2251

Description

Dual Intelligent Subscriber Line Audio-processing Circuit Islac

Manufacturer

Advanced Micro Devices

Datasheet

1.AM79D2251.pdf (35 pages)

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

Figure 13. Spurious Out-of-Band Signals

40 kHz to 240 kHz

240 kHz to 1 MHz

4.6 kHz to 40 kHz

Frequency

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

–

Am79D2251

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

sin

4.0

--------------------------- - dBm0

Frequency (kHz)

f 4000

x x x x x x x x x

1200

–

x x x x x x x