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參數(shù)資料
| 型號： | MAX4230 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | High-Output-Drive, 10MHz, 10V/Us, Rail-to-Rail I/O Op Amps with Shutdown in SC70 |
| 中文描述： | 高輸出驅(qū)動、10MHz、10V/µs、滿擺幅輸入/輸出運(yùn)算放大器，帶有關(guān)斷，SC70封裝 |
| 文件頁數(shù)： | 10/18頁 |
| 文件大?。?/td> | 529K |
| 代理商： | MAX4230 |
M
Choose gain-setting resistors R
IN
and R
F
according to
the amount of desired gain, keeping in mind the maxi-
mum output amplitude. The output coupling capacitor,
C
OUT
, blocks the DC component of the amplifier out-
put, preventing DC current flowing to the load. The out-
put capacitor and the load impedance form a highpass
filer with the -3dB point determined by:
For a 32
load, a 100μF aluminum electrolytic capaci-
tor gives a low-frequency pole at 50Hz.
Bridge Amplifier
The circuit shown in Figure 3 uses a dual MAX4230 to
implement a 3V, 200mW amplifier suitable for use in
size-constrained applications. This configuration elimi-
nates the need for the large coupling capacitor
required by the single op-amp speaker driver when sin-
gle-supply operation is necessary. Voltage gain is set
to 10V/V; however, it can be changed by adjusting the
82k
resistor value.
Rail-to-Rail Input Stage
The MAX4230
–
MAX4234 CMOS op amps have parallel-
connected N- and P-channel differential input stages
that combine to accept a common-mode range extend-
ing to both supply rails. The N-channel stage is active
for common-mode input voltages typically greater than
(V
SS
+ 1.2V), and the P-channel stage is active for
common-mode input voltages typically less than (V
DD
-
1.2V).
Rail-to-Rail Output Stage
The minimum output is within millivolts of ground for sin-
gle-supply operation, where the load is referenced to
ground (V
SS
). Figure 4 shows the input voltage range
and the output voltage swing of a MAX4230 connected
as a voltage follower. The maximum output voltage
swing is load dependent; however, it is guaranteed to
be within 500mV of the positive rail (V
DD
= 2.7V) even
with maximum load (32
to ground).
The MAX4230
–
MAX4234 incorporate a smart short-cir-
cuit protection feature. When V
OUT
is shorted to V
DD
or
V
SS
, the device detects a fault condition and limits the
output current, therefore protecting the device and the
application circuit. If V
OUT
is shorted to any voltage
other than V
DD
or V
SS
, the smart short-circuit protection
is not activated. When the smart short circuit is not
active, the output currents can exceed 200mA (see
Typical Operating Characteristics
.)
Input Capacitance
One consequence of the parallel-connected differential
input stages for rail-to-rail operation is a relatively large
input capacitance C
IN
(5pF typ). This introduces a pole
at frequency (2
π
R
′
C
IN
)
-1
, where R
′
is the parallel combi-
nation of the gain-setting resistors for the inverting or
noninverting amplifier configuration (Figure 5). If the pole
frequency is less than or comparable to the unity-gain
bandwidth (10MHz), the phase margin is reduced, and
the amplifier exhibits degraded AC performance through
either ringing in the step response or sustained oscilla-
tions. The pole frequency is 10MHz when R
′
= 2k
. To
maximize stability, R
′
<< 2k
is recommended.
f
R C
2
π
dB
3
=
1
High-Output-Drive, 10MHz, 10V/μs,
Rail-to-Rail I/O Op Amps with Shutdown in SC70
10
______________________________________________________________________________________
Figure 4. Rail-to-Rail Input/Output Range
Figure 3. Dual MAX4230/MAX4231 Bridge Amplifier for 200mW
at 3V
1
6
7
5
2
8
3V
3V
3
4
MAX4232
1/2
MAX4232
1/2
0.5V
P-P
R5
51k
R1
16k
R2
82k
R4
10k
32
fs = 100Hz
R3
10k
R6
51k
C2
0.1
μ
F
C1
0.1
μ
F
IN
(1V/div)
OUT
(1V/div)
5
μ
s/div
V
CC
= 3.0V
R
L
= 100k
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX4230-MAX4234 | High-Output-Drive, 10MHz, 10V/Us, Rail-to-Rail I/O Op Amps with Shutdown in SC70 |
| MAX4231 | High-Output-Drive, 10MHz, 10V/Us, Rail-to-Rail I/O Op Amps with Shutdown in SC70 |
| MAX4232 | High-Output-Drive, 10MHz, 10V/Us, Rail-to-Rail I/O Op Amps with Shutdown in SC70 |
| MAX4233 | High-Output-Drive, 10MHz, 10V/Us, Rail-to-Rail I/O Op Amps with Shutdown in SC70 |
| MAX4234 | High-Output-Drive, 10MHz, 10V/Us, Rail-to-Rail I/O Op Amps with Shutdown in SC70 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4230AUK | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX4230AUK+ | 制造商:Maxim Integrated Products 功能描述:OP AMP SGL GP R-R I/O 2.5V/5.5V 5PIN SOT-23 - Rail/Tube |
| MAX4230AUK+T | 功能描述:運(yùn)算放大器 - 運(yùn)放 10MHz 10V/us Rail-Rail I/O RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| MAX4230AUK-T | 功能描述:運(yùn)算放大器 - 運(yùn)放 10MHz 10V/us Rail-Rail I/O RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| MAX4230AXK | 制造商:Maxim Integrated Products 功能描述:HIGH-OUTPUT-DRIVE 10MHZ 10V/ S RAIL-TO-RAIL I/O OP AMPS WITH - Rail/Tube |
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