參數(shù)資料
| 型號： | ISL1539IRZ |
| 廠商： | Intersil |
| 文件頁數(shù)： | 11/11頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC VDSL2 LINE DVR AMP 24QFN |
| 標準包裝： | 90 |
| 類型： | 驅動器 |
| 驅動器/接收器數(shù)： | 4/4 |
| 規(guī)程： | VDSL2 |
| 電源電壓： | ±5 V ~ 15 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 24-VFQFN 裸露焊盤 |
| 供應商設備封裝： | 24-QFN（5x4） |
| 包裝： | 管件 |
ISL1539
9
FN7516.4
June 21, 2013
Application Information
The ISL1539 consists of two sets of 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 30MHz and produce low distortion levels. A typical interface
circuit is shown in Figure 20.
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.
Power Supplies and Dissipation
Due to the high power drive capability of the ISL1539, much
attention needs to be paid to power dissipation. The power that
needs to be dissipated in the ISL1539 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 ISL1539 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
Equation 1:
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 ISL1539 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 Equation 2:
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
The overall power dissipation (PDISS) is obtained by adding
PDquiescent and PDtransistor.
Then, the
θJA requirement needs to be calculated. This is done
using Equation 3:
FIGURE 20. TYPICAL LINE INTERFACE CONNECTION
FIGURE 21. DRIVERS WIRED FOR DIFFERENTIAL INPUT
+
-
+
-
ROUT
RG
R
RF
RIN
R
RF
RIN
LINE -
ZLINE
LINE +
ROUT
DRIVER
INPUT
RECEVIE
OUT+
RECEVIE
OUT-
RECEVIE
AMPLIFIERS
+
-
RF
2RG
-
+
-
P
Dquiescent
V
S
I
S
2I
X
–
()
×
=
(EQ. 1)
P
Dtransistors
2I
O
V
S
2
-------
×
V
O
–
=
(EQ. 2)
θ
JA
T
JUNCT
T
AMB
–
()
P
DISS
-------------------------------------------------
=
(EQ. 3)
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| ISL1539IRZ-T13 | 功能描述:緩沖器和線路驅動器 ISL1539IRZ DL CH DIF FRNTL DSL LINE DRVR RoHS:否 制造商:Micrel 輸入線路數(shù)量:1 輸出線路數(shù)量:2 極性:Non-Inverting 電源電壓-最大:+/- 5.5 V 電源電壓-最小:+/- 2.37 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Reel |
| ISL1539IRZ-T7 | 功能描述:緩沖器和線路驅動器 ISL1539IRZ DL CH DIF FRNTL DSL LINE DRVR RoHS:否 制造商:Micrel 輸入線路數(shù)量:1 輸出線路數(shù)量:2 極性:Non-Inverting 電源電壓-最大:+/- 5.5 V 電源電壓-最小:+/- 2.37 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Reel |
| ISL1539IVEZ | 功能描述:緩沖器和線路驅動器 ISL1539IVEZ DL CH DIF DSL LINE DRIVE RoHS:否 制造商:Micrel 輸入線路數(shù)量:1 輸出線路數(shù)量:2 極性:Non-Inverting 電源電壓-最大:+/- 5.5 V 電源電壓-最小:+/- 2.37 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Reel |
| ISL1539IVEZ-T13 | 功能描述:緩沖器和線路驅動器 ISL1539IVEZ DL CH DIF DSL LINE DRIVE RoHS:否 制造商:Micrel 輸入線路數(shù)量:1 輸出線路數(shù)量:2 極性:Non-Inverting 電源電壓-最大:+/- 5.5 V 電源電壓-最小:+/- 2.37 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Reel |
| ISL1539IVEZ-T7 | 功能描述:緩沖器和線路驅動器 ISL1539IVEZ DL CH DIF DSL LINE DRIVE RoHS:否 制造商:Micrel 輸入線路數(shù)量:1 輸出線路數(shù)量:2 極性:Non-Inverting 電源電壓-最大:+/- 5.5 V 電源電壓-最小:+/- 2.37 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Reel |
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