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參數(shù)資料
| 型號： | EL1507CL-T7 |
| 廠商： | Intersil |
| 文件頁數(shù)： | 5/16頁 |
| 文件大小： | 0K |
| 描述： | IC LINE DRIVER ADSL 16-QFN |
| 標(biāo)準(zhǔn)包裝： | 1,000 |
| 類型： | 驅(qū)動(dòng)器 |
| 驅(qū)動(dòng)器/接收器數(shù)： | 1/0 |
| 規(guī)程： | DSL |
| 電源電壓： | 12V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-VQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 16-QFN-EP（4x4） |
| 包裝： | 帶卷 (TR) |
13
FN7013.3
March 26, 2007
Applications Information
The EL1507 consists of two high-power line driver amplifiers
that can be connected for full duplex differential line
transmission. The amplifiers are designed to be used with
signals up to 4MHz and produce low distortion levels. A
typical interface circuit is shown in Figure 51 below.
The amplifiers are wired with one in positive gain and the
other in a negative gain configuration to generate a
differential output for a single-ended input. They will exhibit
very similar frequency responses for gains of three or
greater and thus generate very small common-mode outputs
over frequency, but for low gains the two drivers RF's need
to be adjusted to give similar frequency responses. The
positive-gain driver will generally exhibit more bandwidth and
peaking than the negative-gain driver.
If a differential signal is available to the drive amplifiers, they
may be wired so:
Each amplifier has identical positive gain connections, and
optimum common-mode rejection occurs. Further, DC input
errors are duplicated and create common-mode rather than
differential line errors.
Input Connections
The EL1507 amplifiers are somewhat sensitive to source
impedance. In particular, they do not like being driven by
inductive sources. More than 100nH of source impedance
can cause ringing or even oscillations. This inductance is
equivalent to about 4” of unshielded wiring, or 6” of
unterminated transmission line. Normal high-frequency
construction obviates any such problem.
Power Supplies & Dissipation
Due to the high power drive capability of the EL1507, much
attention needs to be paid to power dissipation. The power
that needs to be dissipated in the EL1507 has two main
contributors. The first is the quiescent current dissipation.
The second is the dissipation of the output stage.
The quiescent power in the EL1507 is not constant with
varying outputs. In reality, 7mA of the 15mA needed to
power the drivers is converted in to output current.
Therefore, in the equation below we should subtract the
average output current, IO, or 7mA, whichever is the lowest.
We’ll call this term IX.
Therefore, we can determine a quiescent current with the
equation:
where:
VS is the supply voltage (VS+ to VS-)
IS is the maximum quiescent supply current (IS+ + IS-)
IX is the lesser of IO or 7mA (generally IX = 7mA)
The dissipation in the output stage has two main
contributors. Firstly, we have the average voltage drop
across the output transistor and secondly, the average
output current. For minimal power dissipation, the user
should select the supply voltage and the line transformer
ratio accordingly. The supply voltage should be kept as low
as possible, while the transformer ratio should be selected
so that the peak voltage required from the EL1507 is close to
the maximum available output swing. There is a trade off,
however, with the selection of transformer ratio. As the ratio
is increased, the receive signal available to the receivers is
reduced.
Once the user has selected the transformer ratio, the
dissipation in the output stages can be selected with the
following equation:
where:
VS is the supply voltage (VS+ to VS-)
VO is the average output voltage per channel
IO is the average output current per channel
FIGURE 51. TYPICAL LINE INTERFACE CONNECTION
-
+
-
+
-
+
-
+
RECEIVE
OUT -
RECEIVE
OUT +
DRIVER
INPUT
RG
RF
R
RIN
R
RIN
RF
ROUT
LINE +
LINE -
RECEIVE
AMPLIFIERS
ZLINE
FIGURE 52. DRIVERS WIRED FOR DIFFERENTIAL INPUT
-
+
-
+
2RG
RF
P
Dquiescent
V
S
I
S
2I
X
–
()
×
=
P
Dtransistors
2I
O
V
S
2
-------
×
V
O
–
=
EL1507
相關(guān)PDF資料 |
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| EL1507CL-T13 | IC LINE DRIVER ADSL 16-QFN |
| EL1507CL | IC LINE DRIVER ADSL 16-QFN |
| EL1508CL | IC LINE DRIVER ADSL 24-QFN |
| MS3126E24-61PX | CONN PLUG 61POS STRAIGHT W/PINS |
| MS3126E24-61PW | CONN PLUG 61POS STRAIGHT W/PINS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| EL1507CLZ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Intersil Corporation 功能描述: |
| EL1507CLZ-T13 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Intersil Corporation 功能描述: |
| EL1507CLZ-T7 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Intersil Corporation 功能描述: |
| EL1507CS | 功能描述:IC LINE DRIVER ADSL 16-SOIC RoHS:否 類別:集成電路 (IC) >> 接口 - 驅(qū)動(dòng)器，接收器，收發(fā)器 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 類型:收發(fā)器 驅(qū)動(dòng)器/接收器數(shù):2/2 規(guī)程:RS232 電源電壓:3 V ~ 5.5 V 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC 包裝:帶卷 (TR) |
| EL1507CS-T13 | 功能描述:IC LINE DRIVER ADSL 16-SOIC RoHS:否 類別:集成電路 (IC) >> 接口 - 驅(qū)動(dòng)器，接收器，收發(fā)器 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 類型:收發(fā)器 驅(qū)動(dòng)器/接收器數(shù):2/2 規(guī)程:RS232 電源電壓:3 V ~ 5.5 V 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC 包裝:帶卷 (TR) |
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