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參數(shù)資料
| 型號(hào)： | AM79Q062JC |
| 廠商： | ADVANCED MICRO DEVICES INC |
| 元件分類： | 編解碼器 |
| 英文描述： | A/MU-LAW, PCM CODEC, PQCC32 |
| 封裝： | PLASTIC, LCC-32 |
| 文件頁(yè)數(shù)： | 14/95頁(yè) |
| 文件大?。?/td> | 1399K |
| 代理商： | AM79Q062JC |
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SLAC Products
21
Discrimination against 12- and 16 kHz Metering Signals
If the QSLAC device is used in a metering application where 12 kHz or 16 kHz tone bursts are injected onto the
telephone line toward the subscriber, a portion of these tones also may appear at the VIN terminal. These out-of-band
signals may cause frequency components to appear below 4 kHz at the digital output. For a 12 kHz or 16 kHz tone,
the frequency components below 4 kHz are reduced from the input by at least 70 dB. The sum of the peak metering
and signal voltages must be within the analog input voltage range.
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 6. The amplitude of the spurious
out-of-band signals between 3400 Hz and 4600 Hz is given by the formula:
Frequency
Level
4.6 kHz to 40 kHz
–32 dBm0
40 kHz to 240 kHz
–46 dBm0
240 kHz to 1 MHz
–36 dBm0
A14
–
14
π f4000
–
()
1200
----------------------------dBm0
sin
–
=
0
–10
–20
–30
–40
–50
–28 dB
–32 dB
QSLAC Device Specification
Frequency (kHz)
3.4
4.0
4.6
21108A-015
Level (dBm0)
Figure 6. Spurious Out-of-Band Signals
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