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參數(shù)資料
| 型號： | OPA4684IDR |
| 英文描述： | Quad, Low-Power, Current-Feedback OPERATIONAL AMPLIFIER |
| 中文描述： | 四，低功耗，電流反饋運算放大器 |
| 文件頁數(shù)： | 15/26頁 |
| 文件大小： | 455K |
| 代理商： | OPA4684IDR |
OPA4684
SBOS240B
15
www.ti.com
common-mode level to be set up. The desired output com-
mon-mode voltage, V
CM
, is cut in half and applied to the
noninverting input of the 2nd stage. The signal path in this
stage sees a gain of
–
1 while this (1/2
V
CM
) voltage sees a
gain of +2. The output of this 2nd stage is then the original
common-mode voltage plus the inverted signal from the
output of the first stage. The output of this 2nd stage then
appears directly at the output of the noninverting final stage.
The inverting node of the inverting output stage is also
biased to the common-mode voltage, equal to the common-
mode voltage appearing at the output of the 2nd stage,
creating no current flow and placing the desired V
CM
at the
output of this stage as well.
LOW-POWER, DIFFERENTIAL I/O, 4th-ORDER ACTIVE FILTER
The OPA4684 can give a very capable gain block for low-
power active filters. The quad design lends itself very well to
800
800
800
1/4
OPA4684
+5V
–
5V
V
CM
V
CM
1/4
OPA4684
1/4
OPA4684
50
800
800
800
1/4
OPA4684
+V
I
(1 + 800
R
G
–
V
I
(1 + 800
R
G
1k
1k
0.1
μ
F
R
I
R
G
V
CM
2
V
I
FIGURE 8. High Gain, DC-Coupled, Single to Differential Conversion.
differential active filters. Where the filter topology is looking
for a simple gain function to implement the filter, the
noninverting configuration is preferred to isolate the filter
elements from the gain elements in the design. Figure 9
shows an example of a very low-power, 10MHz, 4th-order
Butterworth, low-pass Sallen-Key filter. Often, these filters
are designed at an amplifier gain of 1 to minimize amplifier
bandwidth interaction with the desired filter shape. Since the
OPA4684 shows minimal bandwidth change with gain, this
would not be a constraint in this design. The example of
Figure 9 designs the filter for a differential gain of 4 in each
differential stage. This DC-coupled design gives a signal gain
of 16V/V in the passband with a f
–
3dB
at 10MHz. The design
places the higher Q stage first to allow the lower Q 2nd stage
to roll off the peaked noise of the first stage. The resistor
values have been adjusted slightly to account for the ampli-
fier group delay.
FIGURE 9. Low-Power, Differential I/O, 4th-Order Butterworth Active Filter.
1/4
OPA4684
+5V
–
5V
1/4
OPA4684
392
49.9
50pF
100pF
392
49.9
100pF
800
800
534
V
O
V
I
1/4
OPA4684
1/4
OPA4684
249
66.5
50pF
100pF
G
D
= 4, W
O
= 2
π
10MHz, Q = 0.54
G
D
= 4, W
O
= 2
π
10MHz, Q = 1.31
249
66.5
100pF
800
800
534
V
O
/V
I
= 16V/V
f
–
3dB
= 10MHz
P
D
= 68mW
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OPA4684IDRG4 | 功能描述:高速運算放大器 Quad Low-Power Current Feedback 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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| OPA4684IPWR | 功能描述:高速運算放大器 Quad Low-Power Current Feedback 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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| OPA4684IPWRG4 | 功能描述:高速運算放大器 Quad Low-Power Current Feedback 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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| OPA4684IPWT | 功能描述:高速運算放大器 Quad Low-Power Current Feedback 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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| OPA4684IPWTG4 | 功能描述:高速運算放大器 Quad Low-Power Current Feedback 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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
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