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參數(shù)資料
| 型號： | MAX4362EUB |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 通用總線功能 |
| 英文描述： | ADSL Drivers/Receivers for Customer Premise Equipment |
| 中文描述： | DUAL LINE DRIVER, PDSO10 |
| 封裝： | MICRO MAX PACKAGE-10 |
| 文件頁數(shù)： | 10/13頁 |
| 文件大小： | 259K |
| 代理商： | MAX4362EUB |
M
ADSL Drivers/Receivers for Customer Premise
Equipment
10
______________________________________________________________________________________
Circuit
). If the output current is large compared to the
quiescent current, computing the dissipation in the out-
put devices and adding it to the quiescent power dissi-
pation will give a close approximation of the total power
dissipation in the package.
For a 12.5dBm average line power on a 100
line, the
RMS current is 13.4mA. With a one-to-four transformer
the driver therefore supplies 53.6mA RMS. It can be
shown for a DMT signal the ratio of RMS current to the
average rectified current is 0.8. The total power con-
sumption is approximately
P
CONS
= 0.8
53.6 x 5V = 214mW
of which 18mW is delivered as line power and 18mW is
dissipated in the back-matching resistors. Hence the
average power consumption of the IC is approximately
178mW + quiescent power (110mW), or 288mW. For
the MAX4361 in an 8-pin μMAX package, this corre-
sponds to a temperature rise of 64
°
C. With an ambient
temperature of +85
°
C this corresponds to a junction
temperature of +148
°
C, just below the absolute maxi-
mum of +150
°
C.
Please note the part is capable of over 200mA RMS,
which could cause thermal shutdown in applications
with elevated ambient temperatures and/or signals with
low crest factors. See Figure 3 for a guide to power der-
ating for each of the MAX4361/MAX4362/MAX4363
packages.
Transformer Selection
Full-rate, customer premise ADSL requires the trans-
mission of a +12.5dBm (18mW) DMT signal. The DMT
signal has a typical crest factor of 5.3, requiring the line
driver to provide peak line power of 27.5dBm (560mW).
The 27.5dBm peak line power translates into a 28.4V
peak-to-peak differential voltage on the 100
telephone
line. The maximum low-distortion output swing available
from the MAX4361/MAX4362/MAX4363 line driver on a
5V supply is 3.8V and, taking into account the power
lost due to the back-matching resistance, a step-up
transformer with turns ratio of 3.8 or greater is needed.
In the
Typical Operating Circuit
, the MAX4363 is cou-
pled to the phone line through a step-up transformer
with a 1:4 turns ratio. R1 and R2 are back-matching
resistors, each 3.1
(100
/ (2
4
2
)), where 100
is
the approximate phone-line impedance. The total differ-
ential load for the MAX4361/MAX4362/MAX4363,
including the termination resistors, is therefore 12.5
.
Even under these conditions the MAX4361/MAX4362/
MAX4363 provide low distortion signals to within 0.6V of
the power rails.
Receive Channel Considerations
A transformer used at the output of the differential line
driver to step up the differential output voltage to the line
has the inverse effect on signals received from the line.
A voltage reduction or attenuation equal to the inverse of
the turns ratio is realized in the receive channel of a typi-
cal bridge hybrid. The turns ratio of the transformer may
also be dictated by the ability of the receive circuitry to
resolve low-level signals in the noisy, twisted-pair tele-
phone plant. Higher turns-ratio transformers effectively
reduce the received signal-to-noise ratio due to the
reduction in the received signal strength.
The MAX4363 includes an amplifier with typical voltage
noise of only 8.5nV/
√
Hz
and a low-supply current of
2mA/amplifier to be used as the receive channel.
Layout Considerations
Good layout techniques optimize performance by
decreasing the amount of stray capacitance at the
amplifier
’
s inputs and outputs. Excess capacitance will
produce peaking in the amplifier
’
s frequency response.
To decrease stray capacitance, minimize trace lengths
by placing external components as close to the amplifi-
er as possible.
Chip Information
MAX4361 TRANSISTOR COUNT: 1400
MAX4362 TRANSISTOR COUNT: 1400
MAX4363 TRANSISTOR COUNT: 1750
PROCESS: Bipolar
0
0.5
1.5
1.0
2.0
2.5
-40
0
TEMPERATURE (
°
C)
-20
20
40
60
80
M
MAX4362
14-PIN SO
MAX4363
20-PIN SO
MAX4363
20-PIN TSSOP
MAX4361
8-PIN
μ
MAX
MAX4362
10-PIN
μ
MAX
MAX4361
8-PIN SO
Figure 3. Maximum Power Dissipation vs. Temperature
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4362EUB+ | 功能描述:高速運(yùn)算放大器 ADSL Driver/Receiver RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| MAX4362EUB+T | 功能描述:高速運(yùn)算放大器 ADSL Driver/Receiver RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| MAX4362EUB-T | 功能描述:高速運(yùn)算放大器 ADSL Driver/Receiver RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| MAX4363ESP | 功能描述:高速運(yùn)算放大器 RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| MAX4363EUP | 功能描述:高速運(yùn)算放大器 ADSL Driver/Receiver RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
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