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| 型号： | AD8392AACPZ-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 12/12页 |
| 文件大小： | 0K |
| 描述： | IC LINE DRVR ADSL/ADSL 32-LFCSP |
| 标准包装： | 1 |
| 类型： | 驱动器 |
| 驱动器/接收器数： | 2/0 |
| 规程： | xDSL |
| 电源电压： | 5 V ~ 24 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-VFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 32-LFCSP-VQ（5x5） |
| 包装： | 标准包装 |
| 其它名称： | 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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相关代理商/技术参数 |
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| AD8392AACPZ-RL | 功能描述:IC LINE DRVR ADSL/ADSL 32-LFCSP RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:121 系列:- 类型:收发器 驱动器/接收器数:1/1 规程:RS422，RS485 电源电压:3 V ~ 3.6 V 安装类型:表面贴装 封装/外壳:10-WFDFN 裸露焊盘 供应商设备封装:10-DFN（3x3） 包装:管件 |
| AD8392AAREZ | 功能描述:IC ADSL/ADSL2 LINE DRVR 28-TSSOP RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:27 系列:- 类型:收发器 驱动器/接收器数:3/3 规程:RS232，RS485 电源电压:4.75 V ~ 5.25 V 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC 包装:管件 |
| AD8392AAREZ-R7 | 功能描述:IC LINE DRVR ADSL/ADSL 28-TSSOP RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:27 系列:- 类型:收发器 驱动器/接收器数:3/3 规程:RS232，RS485 电源电压:4.75 V ~ 5.25 V 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商设备封装:28-SOIC 包装:管件 |
| AD8392AAREZ-RL | 功能描述:IC LINE DRVR ADSL/ADSL 28-TSSOP RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:121 系列:- 类型:收发器 驱动器/接收器数:1/1 规程:RS422，RS485 电源电压:3 V ~ 3.6 V 安装类型:表面贴装 封装/外壳:10-WFDFN 裸露焊盘 供应商设备封装:10-DFN（3x3） 包装:管件 |
| 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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