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參數(shù)資料
| 型號： | AD8392ACP-R2 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運(yùn)動控制電子 |
| 英文描述： | Low Power, High Output Current, Quad Op Amp, Dual-Channel ADSL/ADSL2+ Line Driver |
| 中文描述： | QUAD OP-AMP, 5000 uV OFFSET-MAX, QCC32 |
| 封裝： | 5 X 5 MM, MO-220VHHD, LFCSP-32 |
| 文件頁數(shù)： | 14/16頁 |
| 文件大小： | 529K |
| 代理商： | AD8392ACP-R2 |
AD8392
Additional definitions for calculating resistor values include:
Rev. 0 | Page 14 of 16
V
OA
k
A
V
β
α
Note: R1 must be calculated before
β
and
α
.
(
N
Voltage at the amplifier outputs
Matching resistance reduction factor
Gain from V
IN
to transformer primary
Negative feedback factor
Positive feedback factor
)
k
V
V
LINE
OA
+
=
1
L
m
R
R
k
2
=
IN
LINE
V
V
N
V
A
=
R2
R1
R1
+
2
β
=
(
)
k
=
1
β
α
With the above known quantities and definitions, the remaining
resistors can readily be calculated.
P
OA
P
V
V
R
V
R1
=
2
2
(
)
IN
P
IN
V
(
2
IN
2
V
V
R
R4
=
)
(
)
R2
R1
R
R
R2
R
R1
R
R1
R
R1
R4
A
R3
L
L
L
L
m
V
2
α
2α
α
+
+
=
(
)
R4
R3
R4
R4
R3
α
R
BIAS
+
=
α
After building the circuit with the closest 1% resistor values,
the actual gain, input resistance, and output resistance can be
verified with the following equations.
(
)
(
)
R3
R4
R
R4
R3
R4
k
N
GAIN
BIAS
LINE
to
V
IN
+
+
+
=
1
1
β
+
R
=
L
L
m
V
IN
R4
R
R
A
R4
R
2
β
1
2
(
)
+
+
+
R4
+
=
BIAS
BIAS
R
BIAS
BIAS
R
m
OUT
R
R4
R
R3
R2
R1
R4
R1
R
R4
N
R
2
1
2
2
MULTITONE POWER RATIO
The DMT signal used in ADSL/ADSL2+ systems carries data in
discrete tones or bins, which appear in the frequency domain in
evenly spaced 4.3125 kHz intervals. In applications using this
type of waveform, multitone power ratio (MTPR) is a com-
monly used measure of linearity. Generally, there are two types
of MTPR that designers are typically concerned with: in-band
and out-of-band MTPR. In-band MTPR is defined as the
measured difference from the peak of one tone that is loaded
with data to the peak of an adjacent tone that is intentionally
left empty. Out-of-band MTPR is more loosely defined as the
spurious emissions that occur in the receive band located
between 25.875 kHz and the first downstream tone at 138 kHz.
Figure 38 and Figure 39 show the AD8392 in-band MTPR for a
5.5 crest factor waveform for empty bins in the ADSL and
extended ADSL2+ bandwidths. Figure 40 shows the AD8392
out-of-band MTPR for the same waveform.
CENTER 647kHz
0
–120
–110
–100
–90
–80
–70
–60
–50
–40
–30
–20
SPAN 10kHz
1kHz/
72.2dB
Figure 38. In-Band MTPR at 647 kHz
CENTER 1.75MHz
0
–120
–110
–100
–90
–80
–70
–60
–50
–40
–30
–20
SPAN 10kHz
1kHz/
64.4dB
Figure 39. In-Band MTPR at 1.751 MHz
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相關(guān)代理商/技術(shù)參數(shù) |
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| AD8392ACP-REEL | 制造商:Analog Devices 功能描述: |
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| AD8392ACPZ-RL7 | 制造商:Analog Devices 功能描述:ADSL Driver Quad 40MHz 32-Pin LFCSP EP T/R 制造商:Analog Devices 功能描述:ADSL DRVR QUAD 40MHZ 32LFCSP EP - Tape and Reel |
| AD8392ARE | 制造商:Analog Devices 功能描述:ADSL Driver Quad 40MHz 28-Pin TSSOP EP 制造商:Analog Devices 功能描述:ADSL DRVR QUAD 40MHZ 28TSSOP EP - Rail/Tube |
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