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參數(shù)資料
| 型號： | PEB2265 |
| 廠商： | SIEMENS AG |
| 元件分類： | Codec |
| 英文描述： | Two Channel Codec Filter with IOM㈢-2 Interface (IOM㈢-2 - SICOFI㈢-2) |
| 中文描述： | 雙信道編解碼器與國際移民組織㈢-2接口（移徙㈢-2 - SICOFI㈢-2） |
| 文件頁數(shù)： | 55/77頁 |
| 文件大?。?/td> | 851K |
| 代理商： | PEB2265 |
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PEB 2265
Transmission Characteristics
Semiconductor Group
55
1997-07-01
5.9
An input signal with its frequency swept between 0.3 to 3 kHz for the receive path, or 0
to 12 kHz for the transmit path, any generated output signal with other frequency than
the input frequency will stay 28 dB below the maximum input level of 0 dBm0.
Single Frequency Distortion
5.10
The quality of Transhybrid-Balancing is very sensitive to deviations in gain and group
delay - deviations inherent to the IOM-2 – SICOFI-2 A/D- and D/A-converters as well as
to all external components used on a line card (SLIC, OP’ s etc.)
Measurement of IOM-2 – SICOFI-2 transhybrid-loss: A 0 dBm0 sine wave signal and a
frequency in the range between 300 - 3400 Hz is applied to the digital input. The
resulting analog output signal at pin
V
OUT
is directly connected to
V
IN
, e.g. with the
IOM-2 – SICOFI-2 testmode “Digital Loop Back via Analog Port”. The programmable
filters FRR, AR, FRX, AX and IM are disabled, the balancing filter TH is enabled with
coefficients optimized for this configuration (
V
OUT
=
V
IN
).
The resulting echo measured at the digital output is at least X dB below the level of the
digital input signal as shown in the table below (Filter coefficients will be provided).
Transhybrid Loss
The listed values for THL correspond to a typical variation of the signal amplitude and
-delay in the analog blocks.
amplitude
= typ.
±
0.15 dB
delay
= typ.
±
0.5
μ
s
Table 10
Receive
Transmit
Frequency
300 Hz to 3.4 kHz
Max. Input Level
0 dBm0
Frequency
0 to 12 kHz
Max. Input Level
0 dBm0
Table 11
Parameter
Symbol
Limit
Values
min.
27
33
29
27
27
Unit
Test Condition
typ.
40
45
40
35
35
Trans Hybrid Loss at 300 Hz
Trans Hybrid Loss at 500 Hz
Trans Hybrid Loss at 2500 Hz
THL
2500
Trans Hybrid Loss at 3000 Hz
THL
3000
Trans Hybrid Loss at 3400 Hz
THL
3400
THL
300
THL
500
dB
dB
dB
dB
dB
T
A
= 25
°
C;
V
DD
= 5 V
T
A
= 25
°
C;
V
DD
= 5 V
T
A
= 25
°
C;
V
DD
= 5 V
T
A
= 25
°
C;
V
DD
= 5 V
T
A
= 25
°
C;
V
DD
= 5 V
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