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| 型號： | MAX4394ESD |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | Ultra-Small, Low-Cost, 85MHz Op Amps with Rail-to-Rail Outputs and Disable |
| 中文描述： | 3 CHANNEL, VIDEO AMPLIFIER, PDSO14 |
| 封裝： | 0.150 INCH, MS-012-AB, SO-14 |
| 文件頁數(shù)： | 12/19頁 |
| 文件大?。?/td> | 734K |
| 代理商： | MAX4394ESD |
M
Ultra-Small, Low-Cost, 85MHz Op Amps with
Rail-to-Rail Outputs and Disable
12
______________________________________________________________________________________
Video Line Driver
The MAX4389/MAX4390/MAX4392
–
MAX4396 are low-
power, voltage-feedback amplifiers featuring large-sig-
nal (2V
P-P
) bandwidths of 90MHz and 0.1dB large-
signal gain flatness of 24MHz. They are designed to
minimize differential-gain error and differential-phase
error to 0.015% and 0.015
°
, respectively. They have a
21ns settling time to 0.1%, 500V/μs slew rates, and out-
put-current-drive capability of up to 50mA making them
ideal for driving video loads.
Inverting and Noninverting Configurations
Select the gain-setting feedback (R
F
) and input (R
G
)
resistor values to fit your application. Large resistor val-
ues increase voltage noise and interact with the amplifi-
er
’
s input and PC board capacitance. This can
generate undesirable poles and zeros and decrease
bandwidth or cause oscillations. For example, a nonin-
verting gain-of-two configuration (R
F
= R
G
) using 2k
resistors, combined with 1pF of amplifier input capaci-
tance and 1pF of PC board capacitance, causes a pole
at 79.6MHz. Since this pole is within the amplifier band-
width, it jeopardizes stability. Reducing the 2k
resis-
tors to 100
extends the pole frequency to 1.59GHz,
but could limit output swing by adding 200
in parallel
with the amplifier
’
s load resistor (Figures 1a and 1b).
Layout and Power-Supply Bypassing
The MAX4389/MAX4390/MAX4392
–
MAX4396 operate
from single 4.5V to 11V or from dual ±2.25V to ±5.5V
supplies. Bypass each supply with a 0.1μF capacitor as
close to the pin as possible.
Maxim recommends using microstrip and stripline tech-
niques to obtain full bandwidth. To ensure that the PC
board does not degrade the amplifier
’
s performance,
design it for a frequency greater than 1GHz. Pay care-
ful attention to inputs and outputs to avoid large para-
sitic capacitance. Whether or not you use a con-
stant-impedance board, observe the following design
guidelines:
Do not use wire-wrap boards; they are too inductive.
Do not use IC sockets; they increase parasitic cap-
acitance and inductance.
Use surface-mount instead of through-hole compo-
nents for better, high-frequency performance.
Use a PC board with at least two layers; it should be
as free from voids as possible.
Keep signal lines as short and as straight as possi-
ble. Do not make 90
°
turns; round all corners.
Low-Power Disable Mode
The MAX4389/MAX4393/MAX4394/MAX4396 feature a
disable function that allows the amplifiers to be placed
in a low-power, high-output-impedance state. When the
disable pin
(DISABLE
) is active, the amplifier
’
s output
impedance is 95k
. This high resistance and the
low 2pF output capacitance make the MAX4389/
MAX4390/MAX4392
–
MAX4396 in RF/video multiplexer
or switch applications. For larger arrays, pay careful
attention to capacitive loading (see the
Output
Capacitive Loading and Stability
section).
Output Capacitive Loading and Stability
The MAX4389/MAX4390/MAX4392
–
MAX4396 are opti-
mized for AC performance. They are not designed to
drive highly reactive loads, which decrease phase mar-
gin and may produce excessive ringing and oscillation.
Figure 2 shows a circuit that eliminates this problem.
Figure 3 is a graph of the Optimal Isolation Resistor
(R
S
) vs. Capacitive Load. Figure 4 shows how a capac-
itive load causes excessive peaking of the amplifier
’
s
frequency response if the capacitor is not isolated from
the amplifier by a resistor. A small isolation resistor
(usually 10
to 15
) placed before the reactive load
prevents ringing and oscillation. At higher capacitive
loads, AC performance is controlled by the interaction
of the load capacitance and the isolation resistor.
Figure 5 shows the effect of a 15
isolation resistor on
closed-loop response.
V
IN
R
G
V
OUT
= -(R
F
/ R
G
) V
IN
R
F
V
OUT
MAX43_ _
Figure 1b. Inverting Gain Configuration
V
IN
R
G
V
OUT
= [1 + (R
F
/ R
G
)] V
IN
R
F
V
OUT
MAX43_ _
Figure 1a. Noninverting Gain Configuration
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX4394EUD | Ultra-Small, Low-Cost, 85MHz Op Amps with Rail-to-Rail Outputs and Disable |
| MAX4395 | Ultra-Small, Low-Cost, 85MHz Op Amps with Rail-to-Rail Outputs and Disable |
| MAX4395ESD | Ultra-Small, Low-Cost, 85MHz Op Amps with Rail-to-Rail Outputs and Disable |
| MAX4395EUD | Ultra-Small, Low-Cost, 85MHz Op Amps with Rail-to-Rail Outputs and Disable |
| MAX4396 | Ultra-Small, Low-Cost, 85MHz Op Amps with Rail-to-Rail Outputs and Disable |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4394ESD+ | 功能描述:高速運算放大器 85MHz w/Rail-Rail Output RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補償電壓: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 |
| MAX4394ESD+T | 功能描述:高速運算放大器 85MHz w/Rail-Rail Output RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補償電壓: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 |
| MAX4394ESD-T | 功能描述:高速運算放大器 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 |
| MAX4394EUD | 功能描述:高速運算放大器 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 |
| MAX4394EUD/V+T | 制造商:Maxim Integrated Products 功能描述:ULTRA-SMALL, LOW-COST, 85MHZ OP AMPS WITH RAIL-TO-RAIL OUTPU - Tape and Reel |
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