- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄384668 > MAX4142 (MAXIM INTEGRATED PRODUCTS INC) 250MHz, Low-Power, High-Output-Current, Differential Line Driver PDF資料下載
參數(shù)資料
| 型號： | MAX4142 |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 通用總線功能 |
| 英文描述： | 250MHz, Low-Power, High-Output-Current, Differential Line Driver |
| 中文描述： | LINE DRIVER, PDSO14 |
| 封裝： | SO-14 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 120K |
| 代理商： | MAX4142 |
M
Using S ENS E+ and S ENS E-
The MAX4142 has two output voltage-sense pins,
SENSE+ and SENSE-. These pins are normally con-
nected to the MAX4142’S OUT+ and OUT- pins. In
some long-line applications, it may be desirable to con-
nect SENSE+ to OUT+ and SENSE- to OUT- at the
load, instead of the typical connection at the part
(Figure 4). This compensates for the long line’s resis-
tance, which otherwise leads to an IR voltage error.
When using this technique, keep the sense lines’
impedance low to minimize gain errors. Also, keep
capacitance low to maximize frequency response. The
gain of the MAX4142 is approximated by the following
equation:
where
R
SENSE+
and
R
SENSE-
are the SENSE+ and
SENSE- trace impedances, respectively. For the
MAX4142, R
F
is 700
and R
G
is 700
.
Additionally, mismatches in the SENSE+ and SENSE-
traces lead to common-mode gain errors. However,
these errors are effectively eliminated by the
MAX4142’s common-mode feedback (see the
Common-Mode Feedback section).
Driving Capac itive Loads
The MAX4142 provides maximum AC performance
when driving no output load capacitance. This is the
case when driving a correctly terminated transmission
line (i.e., a back-terminated cable).
In most amplifier circuits, driving large-load capaci-
tance increases the chance of oscillations. The amplifi-
er’s output impedance and the load capacitor combine
to add a pole and excess phase to the loop response.
If the pole’s frequency is low enough and phase margin
is degraded sufficiently, oscillations may occur. A sec-
ond concern when driving capacitive loads results from
the amplifier’s output impedance, which looks inductive
at high frequencies. The inductance forms an L-C reso-
nant circuit with the capacitive load. This causes peak-
ing in the frequency response and degrades the
amplifier’s phase margin.
The MAX4142 drives capacitive loads up to 25pF with-
out oscillation. However, some peaking may occur in
the frequency domain (Figure 5).
To drive larger-capacitance loads or to reduce ringing,
add isolation resistors between the amplifier’s outputs
and the load (Figure 6).
The value of R
ISO
depends on the capacitive load
(Figure 7). With higher capacitive values, bandwidth is
dominated by the RC network formed by R
ISO
and C
L
;
the bandwidth of the amplifier itself is much higher.
Also note that the isolation resistor forms a divider that
decreases the voltage delivered to the load.
A = 1 +
R +
R
R
R
SENSE
SENSE
G
+
(
)
+
(
)
250MHz, Low-Power, High-Output-Current,
Differential Line Driver
8
_______________________________________________________________________________________
MAX4142
A1
OUT+
IN+
IN-
SENSE+
GND
SENSE-
OUT-
A3
A2
R
F
R
F
R
G
R
L
R
G
Figure 4. Connection of SENSE+ and SENSE- to a Remote
Load
100k
1M
10M
100M
1G
-3
-4
-5
-2
FREQUENCY (Hz)
G
-1
0
1
2
3
4
5
C
L
= 10pF
C
L
= 5pF
C
L
= 15pF
Figure 5. MAX4142 Small-Signal Response with Capacitive
Load
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX4142ESD | 250MHz, Low-Power, High-Output-Current, Differential Line Driver |
| MAX4146EEE | High-Speed, Low-Distortion, Differential Line Receivers |
| MAX4146ESD | High-Speed, Low-Distortion, Differential Line Receivers |
| MAX4144 | High-Speed, Low-Distortion, Differential Line Receivers |
| MAX4144-MAX4146 | High-Speed, Low-Distortion, Differential Line Receivers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4142ESD | 功能描述:緩沖器和線路驅(qū)動器 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(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:緩沖器和線路驅(qū)動器 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(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Reel |
| MAX4142ESD+T | 功能描述:緩沖器和線路驅(qū)動器 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(fēng)格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Reel |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。