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參數(shù)資料
| 型號(hào)： | MAX4222 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | High-Speed, Single-Supply, Gain of @, Closed-Loop, Rail-to-Rail Buffers with Enable |
| 中文描述： | 高速、單電源、增益為+2、閉環(huán)、滿擺幅緩沖器，帶有使能端 |
| 文件頁(yè)數(shù)： | 10/16頁(yè) |
| 文件大?。?/td> | 215K |
| 代理商： | MAX4222 |
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M
As the load resistance decreases, the useful input range
is effectively limited by the output drive capability, since
the buffers have a fixed voltage gain of +2V/V or -1V/V.
For example, a 50
load can typically be driven from
40mV above V
EE
to 1.6V below V
CC
, or 40mV to 3.4V
when operating from a single +5V supply. If the buffer
is operated in the noninverting, gain of +2V/V configu-
ration with the inverting input grounded, the useful input
voltage range becomes 20mV to 1.7V instead of the
-100mV to 2.75V indicated by the Electrical Charac
teristics. Beyond the useful input range, the buffer out-
put is a nonlinear function of the input, but it will not
undergo phase reversal or latchup.
Enable
The MAX4215 and MAX4219 have an enable feature
(EN_) that allows the buffer to be placed in a low-power
state. When the buffers are disabled, the supply current
is reduced to 400μA per buffer.
As the voltage at the EN_ pin approaches the negative
supply rail, the EN_ input current rises. Figure 2 shows
a graph of EN_ input current versus EN_ pin voltage.
Figure 3 shows the addition of an optional resistor in
series with the EN pin, to limit the magnitude of the cur-
rent increase. Figure 4 displays the resulting EN pin
input current to voltage relationship.
Disabled Output Resistanc e
The MAX4214/MAX4215/MAX4217/MAX4219/MAX4222
include internal protection circuitry that prevents dam-
age to the precision input stage from large differential
input voltages (Figure 5). This protection circuitry con-
sists of five back-to-back Schottky diodes between
IN_+ and IN_-. These diodes reduce the disabled out-
put resistance from 1k
to 500
when the output volt-
age is 3V greater or less than the voltage at IN_+.
Under these conditions, the input protection diodes will
be forward biased, lowering the disabled output resis-
tance to 500
.
Output Capac itive Loading and S tability
The MAX4214 family provides maximum AC perfor-
mance with no load capacitance. This is the case when
the load is a properly terminated transmission line.
These devices are designed to drive up to 20pF of load
capacitance without oscillating, but AC performance
will be reduced under these conditions.
High-S peed, S ingle-S upply, Gain of +2,
Closed-Loop, Rail-to-Rail Buffers with Enable
10
______________________________________________________________________________________
20
-160
0
100
300
500
-100
-120
0
V
IL
(mV ABOVE V
EE
)
I
μ
A
200
400
-60
-140
-20
-40
-80
Figure 2. Enable Logic-Low Input Current vs. Enable Logic-
Low Threshold
OUT
IN-
EN_
IN+
10k
ENABLE
500
500
MAX42_ _
Figure 3. Circuit to Reduce Enable Logic-Low Input Current
0
-10
0
100
300
500
-7
-8
-1
V
IL
(mV ABOVE V
EE
)
I
μ
A
200
400
-3
-5
-9
-2
-4
-6
Figure 4. Enable Logic-Low Input Current vs. Enable Logic-
Low Threshold with 10k
Series Resistor
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX4222EEE | High-Speed, Single-Supply, Gain of @, Closed-Loop, Rail-to-Rail Buffers with Enable |
| MAX4222ESD | High-Speed, Single-Supply, Gain of @, Closed-Loop, Rail-to-Rail Buffers with Enable |
| MAX4219 | High-Speed, Single-Supply, Gain of @, Closed-Loop, Rail-to-Rail Buffers with Enable |
| MAX4219ESD | High-Speed, Single-Supply, Gain of @, Closed-Loop, Rail-to-Rail Buffers with Enable |
| MAX4215EUA | High-Speed, Single-Supply, Gain of @, Closed-Loop, Rail-to-Rail Buffers with Enable |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4222EEE | 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 |
| MAX4222EEE/GG8 | 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 |
| MAX4222EEE/GH9 | 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 |
| MAX4222EEE/GH9-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 |
| MAX4222EEE+ | 功能描述:高速運(yùn)算放大器 Buffers with Enable 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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