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參數(shù)資料
| 型號： | AD8392AACPZ-R7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 12/12頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC LINE DRVR ADSL/ADSL 32-LFCSP |
| 標準包裝： | 1 |
| 類型： | 驅(qū)動器 |
| 驅(qū)動器/接收器數(shù)： | 2/0 |
| 規(guī)程： | xDSL |
| 電源電壓： | 5 V ~ 24 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 32-VFQFN 裸露焊盤，CSP |
| 供應商設備封裝： | 32-LFCSP-VQ（5x5） |
| 包裝： | 標準包裝 |
| 其它名稱： | AD8392AACPZ-R7DKR |
AD8392A
Rev. 0 | Page 9 of 12
TYPICAL ADSL/ADSL2+ APPLICATION
In a typical ADSL/ADSL2+ application, a differential line driver
is used to take the signal from the analog front end (AFE) and
drive it onto the twisted pair telephone line. Referring to the
typical circuit representation in Figure 18, the differential input
appears at VIN+ and VIN from the AFE, while the differential
output is transformer coupled to the telephone line at tip and
ring. The common-mode operating point, generally midway
between the supplies, is set through VCOM.
R4
R3
Rm
R2
R1
R2
VCOM
1:N
TIP
RING
ROUT
RIN
Rm
VOA
VP
RBIAS
VIN–
VIN+
06
47
7-
0
24
Figure 18. Typical ADSL/ADSL2+ Application Circuit
In ADSL/ADSL2+ applications, it is common practice to
conserve power by using positive feedback to synthesize the
output resistance, thereby lowering the required ohmic value
somewhat unique in that the positive feedback introduced via
R3 has the effect of synthesizing the input resistance as well.
The following definitions and equations can be used to calculate
the resistor values necessary to obtain the desired gain, input
resistance, and output resistance for a given application. For
simplicity, the following calculations assume a lossless
transformer.
The following values are used in the design equations and are
assumed already known or chosen by the designer.
Value
Definition
VIN
Differential input voltage
RIN
Desired differential input resistance
N
Transformer turns ratio
VLINE
Differential output voltage at tip and ring
Rm
Each is typically 5% to 15% of the transformer reflected
line impedance
R2
Recommended in the amplifier data sheet
VP
Voltage at the + inputs to the amplifier, approximately
VIN (must be less than VIN for positive input resistance)
RL
Transformer reflected line impedance
Additional definitions for calculating resistor values include:
Value
Definition
VOA
Voltage at the amplifier outputs
k
Matching resistance reduction factor
AV
Gain from VIN to transformer primary
β
Negative feedback factor
α
Positive feedback factor
Note: R1 must be calculated before
β and α.
(
)
N
k
V
LINE
OA
+
=
1
L
m
R
k
2
=
IN
LINE
V
N
V
A =
R2
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
R
V
R1
=
2
(
)
IN
P
IN
V
2
V
R
R4
=
(
)
()
R2
R1
R
R2
R
R1
R
R1
R
R1
R4
A
R3
L
m
V
2
α
2α
α
2
+
+
=
()
R4
R3
R4
R3
RBIAS
+
=
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
VIN
+
=
1
β
+
=
L
m
V
IN
R
R4
R
A
R4
R
2
β
1
2
()
+
+
=
BIAS
m
OUT
R
R4
R
R4
R3
R2
R1
R
R4
R1
R
R4
N
R
2
1
2
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| AD8392ACP-R2 | 制造商:Analog Devices 功能描述: 制造商:Rochester Electronics LLC 功能描述: |
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