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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)： | 26/44頁 |
| 文件大?。?/td> | 847K |
| 代理商： | T8538B |
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26
Agere Systems Inc.
Preliminary Data Sheet
August 2001
T8538B Quad Programmable Codec
Electrical Characteristics
(continued)
Gain and Dynamic Range
Table 9. Gain and Dynamic Range
Parameter
Symbol
GAL
Test Conditions
Min
Typ
Max
Unit
Absolute Levels
Maximum 0 dBm0 levels (1004 Hz):
VF
X
I (encoder milliwatt), all programma-
ble transmit gains set to 0 dB.
RCV (decoder milliwatt), termination
impedance off, GRX1
= 0 dB,
GRX2
=
2.34 dB.
Minimum 0 dBm0 levels (1004 Hz):
VF
X
I (encoder milliwatt),
XAG = 24 dB, GTX1 = 6 dB,
GTX2 = 0 dB.
RCV (decoder milliwatt), termination
impedance off, GRX1
= 0 dB,
GRX2
=
6 dB
VF
X
I
VF
R
OP to VF
R
ON (differential)
Transmit gain programmed for maxi-
mum 0 dBm0 test level, measured devi-
ation of digital code from ideal
0 dBm0 level at DX digital outputs, with
transmit gain set to 0 dB:
20 °C to 70 °C
0 °C to 85 °C
40
°C
to +85
°C
Measured transmit gain over the range
from maximum to minimum, calculated
deviation from the programmed gain rel-
ative to GXA at 0 dB, V
DD
= 5 V.
Relative to 1004 Hz, minimum
gain < GX < maximum gain,
VF
X
I = 0 dBm0 signal, path gain
set to 0 dB:
f = 16.67 Hz
f = 40 Hz
f = 50 Hz
f = 60 Hz
f = 200 Hz
f = 300 Hz to 3000 Hz
f = 3140 Hz
f = 3380 Hz
f = 3860 Hz
f = 4600 Hz and above
—
—
2.80
3.8
—
—
Vp-p
Vp-p
Absolute Levels
GAL
—
—
—
—
87.5
2.63
—
—
—
—
2.9
5.0
m
Vp-p
Vp-p
Vp-p
Vp-p
Absolute Maximum Volt-
age Swings
Transmit Gain Absolute
Accuracy
GAL
GXA
—
0.25
0.30
±0.15
—
—
—
0.25
0.30
dB
dB
dB
Transmit Gain Variation
with Programmed Gain
GXAG
0.1
—
0.1
dB
Transmit Gain Variation
with Frequency, 600
Resistive Source
Impedance and Syn-
thesized Termination
Impedance
GXAF
—
—
—
—
3.0
0.125
0.57
0.735
—
—
50
40
40
55
2.0
±0.04
0.01
0.03
8.8
—
30
26
30
30
0
0.135
0.125
0.015
8.98
32
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
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