參數(shù)資料
型號： T8538B
元件分類： Codec
英文描述： T8538B Quad Programmable Codec
中文描述： T8538B四可編程編解碼器
文件頁數(shù)： 27/44頁
文件大?。?/td> 847K
代理商： T8538B
Agere Systems Inc.
27
Preliminary Data Sheet
August 2001
T8538B Quad Programmable Codec
Electrical Characteristics
(continued)
Gain and Dynamic Range
(continued)
Table 9. Gain and Dynamic Range
(continued)
* Applied to all four channels.
Parameter
Symbol
GXAL
Test Conditions
Sinusoidal test method*,
reference level = 0 dBm0:
VF
X
I =
40 dBm0 to +3 dBm0
VF
X
I =
50 dBm0 to
40 dBm0
VF
X
I =
55 dBm0 to
50 dBm0
Receive gain programmed to
6 dB,
apply 0 dBm0 signal to IPCM, mea-
sure
V
RCV
,
R
L
= 100 k
differential:
20 °C to 70 °C
0 °C to 85 °C
40
°C
to +85
°C
Digital input 0 dBm0 signal,
f = 300 Hz to 3400 Hz.
Digital input 0 dBm0 signal,
f = 300 Hz to 3400 Hz.
Measure receive gain over the range
from maximum to minimum setting,
calculated deviation from the pro-
grammed gain relative to GRA at
0 dB,
V
DD
= 5 V.
Relative to 1004 Hz, digital input =
0 dBm0 code, minimum gain < GR <
maximum gain, 0 dB path gain:
f = below 3000 Hz
f = 3140 Hz
f = 3380 Hz
f = 3860 Hz
f = 4600 Hz and above
Sinusoidal test method*,
reference level = 0 dBm0:
IPCM digital level =
40 dBm0 to +3 dBm0
IPCM digital level =
50 dBm0 to
40 dBm0
IPCM digital level =
55 dBm0 to
50 dBm0
Min
Typ
Max
Unit
Transmit Gain Variation
with Signal Level
0.25
0.50
1.40
—
—
—
0.25
0.50
1.40
dB
dB
dB
Receive Gain Absolute
Accuracy
GRA
—
0.25
0.30
±0.15
—
—
—
0.25
0.30
dB
dB
dB
Relative Gain,
VF
R
OP
to
VF
R
ON
Relative Phase,
VF
R
OP
to
VF
R
ON
Receive Gain Variation
with Programmed Gain
—
0.01
—
0.01
dB
—
0.25
—
0.25
Degrees
GRAG
0.1
—
0.1
dB
Receive Gain Variation
with Frequency,
600
Resistive Termination
GRAF
0.125
0.57
0.735
—
—
±0.04
±0.04
0.550
10.7
—
0.125
0.125
0.015
8.98
28
dB
dB
dB
dB
dB
Receive Gain Variation
with Signal Level
GRAL
0.25
0.50
1.40
—
—
—
0.25
0.50
1.40
dB
dB
dB
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