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參數(shù)資料
| 型號(hào)： | MAX4142 |
| 廠(chǎng)商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類(lèi)： | 通用總線(xiàn)功能 |
| 英文描述： | 250MHz, Low-Power, High-Output-Current, Differential Line Driver |
| 中文描述： | LINE DRIVER, PDSO14 |
| 封裝： | SO-14 |
| 文件頁(yè)數(shù)： | 7/12頁(yè) |
| 文件大?。?/td> | 120K |
| 代理商： | MAX4142 |
M
250MHz, Low-Power, High-Output-Current,
Differential Line Driver
_______________________________________________________________________________________
7
differential signal that is amplified by the receiver. The
unique topology of the MAX4142 (Figure 1) utilizes two
amplifiers (A1 and A2) to provide differential inputs and
outputs, and a third amplifier (A3) to provide common-
mode feedback. The common-mode feedback amplifi-
er senses common-mode voltage at the MAX4142
output and forces this voltage to zero, effectively
removing common-mode voltages from the transmis-
sion line. This technique improves CMR for systems
with imperfectly balanced transmission-line imped-
ances.
Grounding, Bypassing,
and PC Board Layout
Observe the following guidelines when designing your
PC board:
High-frequency design techniques must be followed
when designing the PC board for the MAX4142.
The printed circuit board should have at least two
layers: the signal layer and the ground plane.
Do not use wire-wrap boards; they are too inductive.
Do not use IC sockets; they increase parasitic
capacitance and inductance.
Use surface-mount power-supply bypass capacitors
instead of through-hole capacitors. Their shorter lead
lengths reduce parasitic inductance, leading to
superior high-frequency performance.
Keep signal lines as short and as straight as possi-
ble. Do not make 90° turns; round all corners.
The ground plane should be as free from voids as
possible.
Input S tage Circ uitry
The MAX4142 includes internal protection circuitry that
prevents damage to the precision input stage from
large differential input voltages. This protection circuitry
consists of five back-to-back Schottky protection
diodes between IN+ and R
G
, and IN- and R
G
(Fig-
ure 2). The diodes limit the differential voltage applied
to the amplifiers’ internal circuitry to no more than 10V
F
,
where V
F
is the diode’s forward voltage drop (about
0.4V at +25°C).
For a large differential input voltage (exceeding 4V), the
MAX4142 input bias current (at IN+ and IN-) increases
according to the following equation:
Input current = [(V
IN+
- V
IN-
) - 10V
F
] / 1.4k
A differential input voltage as high as 10V will cause
only 2.1mA to flow—much less than the 10mA absolute
maximum rating.
S hutdown Mode
The MAX4142 can be put into low-power shutdown
mode by driving SHDN high. The amplifier output is
high impedance in this mode; thus the impedance at
OUT is that of the feedback resistors (2.8k
) (Figure 3).
MAX4142
A1
OUT+
IN+
IN-
SENSE+
SENSE-
OUT-
A2
R
F
R
F
2R
G
Figure 2. MAX4142 Input Protection Circuit
Figure 3. MAX4142 Shutdown Equivalent Circuit
OUT+
OUT-
IN-
IN+
700
700
1.4k
MAX4142
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PDF描述 |
|---|---|
| MAX4142ESD | 250MHz, Low-Power, High-Output-Current, Differential Line Driver |
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| MAX4144 | High-Speed, Low-Distortion, Differential Line Receivers |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4142ESD | 功能描述:緩沖器和線(xiàn)路驅(qū)動(dòng)器 RoHS:否 制造商:Micrel 輸入線(xiàn)路數(shù)量:1 輸出線(xiàn)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(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Reel |
| MAX4142ESD/GH9 | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX4142ESD/GH9-T | 制造商:Maxim Integrated Products 功能描述:- Tape and Reel |
| MAX4142ESD+ | 功能描述:緩沖器和線(xiàn)路驅(qū)動(dòng)器 RoHS:否 制造商:Micrel 輸入線(xiàn)路數(shù)量:1 輸出線(xiàn)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(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Reel |
| MAX4142ESD+T | 功能描述:緩沖器和線(xiàn)路驅(qū)動(dòng)器 RoHS:否 制造商:Micrel 輸入線(xiàn)路數(shù)量:1 輸出線(xiàn)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(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Reel |
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