參數(shù)資料
型號(hào)： OPA685N
英文描述： Ultra-Wideband, Current-Feedback OPERATIONAL AMPLIFIER With Disable TM
中文描述： 超寬帶，電流反饋運(yùn)算放大器商標(biāo)使用禁用
文件頁數(shù)： 14/28頁
文件大?。?/td> 283K
代理商： OPA685N
14
OPA685
Figure 3 shows the AC–coupled, single +5V supply, gain of
+8V/V circuit configuration used as the basis for the +5V
only Specifications and Typical Performance Curves. The
key requirement of broadband single-supply operation is
maintaining input and output signal swings within the speci-
fied useable voltage ranges. The circuit in Figure 3 estab-
lishes an input midpoint bias using a simple resistive divider
from the +5V supply (two 806
resistors) to the non-
inverting input. The input signal is then AC-coupled into this
midpoint voltage bias. The input voltage can swing to within
1.7V of either supply pin, giving a 1.4Vp-p input signal
range centered around the +5V supply midpoint. The input
impedance matching resistor (57.6
) used in Figure 3 is
adjusted to give a 50
input match when the parallel
combination of the biasing divider network is included. The
gain resistor (R
G
) is AC-coupled, giving the circuit a DC
gain of +1, which puts the input DC bias voltage (2.5V) at
the output as well. The feedback resistor value has been
adjusted from the bipolar supply condition to re-optimize for
a flat frequency response in +5V only, gain of +8, operation
(see Setting Resistor Values to Optimize Bandwidth section
of this data sheet). On a single +5V supply, the output
voltage can swing to within 1.4V of either supply pin while
delivering more than 70mA output current, giving a 2.2V
output swing into 100
(5dBm maximum at the matched
load). The circuit of Figure 3 shows a blocking capacitor
driving into a 50
output resistor, then into a 50
load.
Alternatively, the blocking capacitor could be removed if
the load is tied to a supply midpoint, or to ground if the DC
current required by the load is acceptable.
Figure 4 shows the AC-coupled, single +5V supply, gain of
–8V/V circuit configuration used as the basis for the +5V
only Typical Performance Curves. In this case, the midpoint
DC bias on the non-inverting input is also decoupled with an
additional 0.1
μ
F decoupling capacitor. This reduces the
source impedance at higher frequencies for the non-invert-
ing input bias current noise. This 2.5V bias on the non-
inverting input pin also appears on the inverting input pin
and, since R
G
is DC-blocked by the input capacitor, will also
appear at the output pin. One advantage to inverting opera-
tion is that since there is no signal swing across the input
stage, higher slew rates and operation at even lower supply
voltages is possible. To retain a 1Vp-p output capability,
operation down to a +3V supply is allowed. At a +3V
supply, the input common-mode range is 0V, but for the
inverting configuration of a current feedback amplifier,
wideband operation is retained even with the input stage
saturated. The circuit in Figure 4 can be operated down to a
3V supply with > 200MHz, 1Vp-p output.
FIGURE 3. AC-Coupled, G = +8V/V, Single-Supply Specifications and Test Circuit.
FIGURE 4. AC-Coupled, G = –8V/V, Single-Supply Specifications and Test Circuit.
OPA685
+5V
+V
S
DIS
50
Load
50
R
G
50
806
806
57.6
0.1
μ
F
+
6.8
μ
F
0.1
μ
F
0.1
μ
F
0.1
μ
F
V
I
V
O
50
Source
R
F
348
OPA685
+5V
+V
S
DIS
50
Load
50
R
G
50
806
806
20
0.1
μ
F
0.1
μ
F
0.1
μ
F
V
O
V
I
R
F
400
+
6.8
μ
F
0.1
μ
F
相關(guān)PDF資料
PDF描述
OPA685U Ultra-Wideband, Current-Feedback OPERATIONAL AMPLIFIER With Disable TM
OPA699ID Wideband, High Gain VOLTAGE LIMITING AMPLIFIER
OPA699 Wideband, High Gain VOLTAGE LIMITING AMPLIFIER
OPA699IDR Wideband, High Gain VOLTAGE LIMITING AMPLIFIER
OPA708 REFLECTIVE OBJECT SENSORS
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
OPA685N/250 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Current-Feedback Operational Amplifier
OPA685N/3K 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Current-Feedback Operational Amplifier
OPA685U 功能描述:高速運(yùn)算放大器 Ultra-Wideband 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
OPA685U/2K5 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Current-Feedback Operational Amplifier
OPA686 制造商:BB 制造商全稱:BB 功能描述:Wideband, Low Noise, Voltage Feedback OPERATIONAL AMPLIFIER
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*