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參數(shù)資料
| 型號(hào)： | OPA4684IPWT |
| 英文描述： | Quad, Low-Power, Current-Feedback OPERATIONAL AMPLIFIER |
| 中文描述： | 四，低功耗，電流反饋運(yùn)算放大器 |
| 文件頁數(shù)： | 13/26頁 |
| 文件大小： | 455K |
| 代理商： | OPA4684IPWT |
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OPA4684
SBOS240B
13
www.ti.com
directly into the blocking capacitor. The source will then see
the 5k
load of the biasing network as a load. The gain
resistor (R
G
) is AC-coupled, giving the circuit a DC gain of +1,
which puts the noninverting input DC bias voltage (2.5V) on
the output as well. The feedback resistor value has been
adjusted from the bipolar
±
5V supply condition to re-optimize
for a flat frequency response in +5V only, gain of +2,
operation. On a single +5V supply, the output voltage can
swing to within 1.0V of either supply pin while delivering more
than 70mA output current
—
easily giving a 3Vp-p output
swing into 100
(8dBm maximum at the matched 50
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
–
1V/V circuit configuration used as a basis for the inverting
+5V only Typical Characteristics for each channel. In this
case, the midpoint DC bias on the noninverting input is also
decoupled with an additional 0.1
μ
F capacitor. This reduces
the source impedance at higher frequencies for the
noninverting input bias current noise. This 2.5V bias on the
noninverting input pin 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 to 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 stage is saturated, but for the inverting configuration
of a current-feedback amplifier, wideband operation is re-
tained even under this condition.
FIGURE 3. AC-Coupled, G = +2V/V, Single-Supply Specifi-
cations and Test Circuit.
R
F
1k
1/4
OPA4684
+5V
50
50
Load
50
Source
0.1
μ
F
6.8
μ
F
+
10k
10k
R
M
50
R
G
1k
0.1
μ
F
0.1
μ
F
0.1
μ
F
V
I
R
F
1.3k
1/4
OPA4684
+5V
DIS
50
50
Load
50
Source
0.1
μ
F
0.1
μ
F
6.8
μ
F
+
R
G
1.3k
10k
10k
0.1
μ
F
V
I
0.1
μ
F
R
52.3
FIGURE 4. AC-Coupled, G =
–
1V/V, Single-Supply Specifi-
cations and Test Circuit.
The circuits of Figure 3 and 4 show single-supply operation
at +5V. These same circuits may be used up to single
supplies of +12V with minimal change in the performance of
the OPA4684.
FIGURE 5. Noninverting Differential I/O Amplifier.
R
F
800
R
F
800
1/4
OPA4684
+V
CC
–
V
CC
R
G
V
O
1/4
OPA4684
V
I
DIFFERENTIAL INTERFACE APPLICATIONS
Dual and quad op amps are particularly suitable to differen-
tial input to differential output applications. Typically, these
fall into either ADC input interface or line driver applications.
Two basic approaches to differential I/O are noninverting or
inverting configurations. Since the output is differential, the
signal polarity is somewhat meaningless
—
the noninverting
and inverting terminology applies here to where the input is
brought into the OPA4684. Each has its advantages and
disadvantages. Figure 5 shows a basic starting point for
noninverting differential I/O applications.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OPA4684IPWTG4 | 功能描述:高速運(yùn)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(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 |
| OPA4684M | 制造商:TI 制造商全稱:Texas Instruments 功能描述:QUAD LOW-POWER CURRENT-FEEDBACK OPERATIONAL AMPLIFIER |
| OPA4684MJD | 制造商:Texas Instruments 功能描述:QUAD, LOW-POWER, CURRENT-FEEDBACK OP AMP - Rail/Tube |
| OPA4703 | 制造商:BB 制造商全稱:BB 功能描述:CMOS, Rail-to-Rail, I/O OPERATIONAL AMPLIFIERS |
| OPA4703EA | 制造商:TI 制造商全稱:Texas Instruments 功能描述:CMOS, Rail-to-Rail, I/O OPERATIONAL AMPLIFIERS |
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