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參數(shù)資料
| 型號： | MAX4394ESD+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 4/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC OP AMP 85MHZ R-R 14-SOIC |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 應(yīng)用： | 電壓反饋 |
| 輸出類型： | 滿擺幅 |
| 電路數(shù)： | 3 |
| -3db帶寬： | 85MHz |
| 轉(zhuǎn)換速率： | 500 V/µs |
| 電流 - 電源： | 6mA |
| 電流 - 輸出 / 通道： | 95mA |
| 電壓 - 電源，單路/雙路(±)： | 4.5 V ~ 11 V，±2.25 V ~ 5.5 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 14-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 14-SOIC |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 產(chǎn)品目錄頁面： | 1390 (CN2011-ZH PDF) |
| 其它名稱： | MAX4394ESD+TDKR |
MAX4389/MAX4390/MAX4392–MAX4396
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 (2VP-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/s 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 (RF) and input (RG)
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 (RF = RG) using 2kΩ
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 2kΩ resis-
tors to 100Ω extends the pole frequency to 1.59GHz,
but could limit output swing by adding 200Ω 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 0.1F 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 95kΩ. 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
(RS) 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 10Ω to 15Ω) 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 15Ω isolation resistor on
closed-loop response.
VIN
RG
VOUT = -(RF / RG) VIN
RF
VOUT
MAX43_ _
Figure 1b. Inverting Gain Configuration
VIN
RG
VOUT = [1 + (RF / RG)] VIN
RF
VOUT
MAX43_ _
Figure 1a. Noninverting Gain Configuration
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4394EUD | 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 |
| 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 |
| MAX4394EUD+ | 功能描述:高速運(yùn)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(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 |
| MAX4394EUD+T | 功能描述:高速運(yùn)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(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 |
| MAX4394EUD-T | 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 |
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