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參數(shù)資料
| 型號： | EL1507CS |
| 廠商： | Intersil |
| 文件頁數(shù)： | 6/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC LINE DRIVER ADSL 16-SOIC |
| 標準包裝： | 47 |
| 類型： | 驅(qū)動器 |
| 驅(qū)動器/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-SOIC（0.154"，3.90mm 寬） |
| 供應商設備封裝： | 16-SOIC |
| 包裝： | 管件 |
14
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Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without
notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and
reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result
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FN7013.3
March 26, 2007
The overall power dissipation (PDISS) is obtained by adding
PDquiescent and PDtransistor.
Then, the
θJA requirement needs to be calculated. This is
done using the equation:
where:
TJUNCT is the maximum die temperature (150°C)
TAMB is the maximum ambient temperature
PDISS is the dissipation calculated above
θ
JA is the junction to ambient thermal resistance for the
package when mounted on the PCB
This
θ
JA value is then used to calculate the area of copper
needed on the board to dissipate the power.
The SO power packages are designed so that heat may be
conducted away from the device in an efficient manner. To
disperse this heat, the center leads are internally connected
to the mounting platform of the die. Heat flows through the
leads into the circuit board copper, then spreads and
convects to air. Thus, the ground plane on the component
side of the board becomes the heatsink. This has proven to
be a very effective technique. A separate application note
details the 16 Ld QFN PCB design considerations.
Single Supply Operation
The EL1507 can also be powered from a single supply
voltage. When operating in this mode, the GND pins can still
be connected directly to GND. To calculate power
dissipation, the equations in the previous section should be
used, with VS equal to half the supply rail.
Output Loading
While the drive amplifiers can output in excess of 400mA
transiently, the internal metallization is not designed to carry
more than 75mA of steady DC current and there is no
current-limit mechanism. This allows safely driving rms
sinusoidal currents of 2 x 75mA, or 150mA. This current is
more than that required to drive line impedances to large
output levels, but output short circuits cannot be tolerated.
The series output resistor will usually limit currents to safe
values in the event of line shorts. Driving lines with no series
resistor is a serious hazard.
The amplifiers are sensitive to capacitive loading. More than
25pF will cause peaking of the frequency response. The same
is true of badly terminated lines connected without a series
matching resistor.
Power Supplies
The power supplies should be well bypassed close to the
EL1507. A 3.3F tantalum capacitor for each supply works well.
Since the load currents are differential, they should not travel
through the board copper and set up ground loops that can
return to amplifier inputs. Due to the class AB output stage
design, these currents have heavy harmonic content. If the
ground terminal of the positive and negative bypass capacitors
are connected to each other directly and then returned to circuit
ground, no such ground loops will occur. This scheme is
employed in the layout of the EL1507 demonstration board,
and documentation can be obtained from the factory.
Feedback Resistor Value
The bandwidth and peaking of the amplifiers varies with supply
voltage somewhat and with gain settings. The feedback resistor
values can be adjusted to produce an optimal frequency
response. Here is a series of resistor values that produce an
optimal driver frequency response (<1dB peaking) for different
supply voltages and gains:
Power Control Function
The EL1507 contains two forms of power control operation.
Two digital inputs, C0 and C1, can be used to control the supply
current of the EL1507 drive amplifiers. As the supply current is
reduced, the EL1507 will start to exhibit slightly higher levels of
distortion and the frequency response will be limited. The 4
below:
θ
JA
T
JUNCT
T
AMB
–
()
P
DISS
-------------------------------------------------
=
TABLE 1. OPTIMUM DRIVER FEEDBACK RESISTOR FOR
VARIOUS GAINS AND SUPPLY VOLTAGES
Supply
Voltage
Driver Voltage Gain
2.5
5
10
±5V
2k
1.8k
1.5k
±12V
2k
1.8k
1.5k
TABLE 2. POWER MODES OF THE EL1507
C1
C0
Operation
00
IS Full Power Mode
01
-IS Power Mode
10
-IS Power Mode
1
Power Down
EL1507
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相關代理商/技術參數(shù) |
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| 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)動器，接收器，收發(fā)器 系列:- 標準包裝:1,000 系列:- 類型:收發(fā)器 驅(qū)動器/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） 供應商設備封裝:16-SOIC 包裝:帶卷 (TR) |
| EL1507CS-T7 | 功能描述:IC LINE DRIVER ADSL 16-SOIC RoHS:否 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 標準包裝:1,000 系列:- 類型:收發(fā)器 驅(qū)動器/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） 供應商設備封裝:16-SOIC 包裝:帶卷 (TR) |
| EL1507CSZ | 功能描述:IC LINE DRIVER ADSL 16-SOIC RoHS:是 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 標準包裝:1,000 系列:- 類型:收發(fā)器 驅(qū)動器/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） 供應商設備封裝:16-SOIC 包裝:帶卷 (TR) |
| EL1507CSZ-T13 | 功能描述:IC LINE DRIVER ADSL 16-SOIC RoHS:是 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 標準包裝:1,000 系列:- 類型:收發(fā)器 驅(qū)動器/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） 供應商設備封裝:16-SOIC 包裝:帶卷 (TR) |
| EL1507CSZ-T7 | 功能描述:IC LINE DRIVER ADSL 16-SOIC RoHS:是 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 標準包裝:1,000 系列:- 類型:收發(fā)器 驅(qū)動器/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） 供應商設備封裝:16-SOIC 包裝:帶卷 (TR) |
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