- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄383692 > OPA3682U Triple, Wideband, Fixed Gain BUFFER AMPLIFIER With Disable PDF資料下載
參數(shù)資料
| 型號： | OPA3682U |
| 英文描述： | Triple, Wideband, Fixed Gain BUFFER AMPLIFIER With Disable |
| 中文描述： | 三，寬帶，固定增益緩沖放大器具有禁用 |
| 文件頁數(shù)： | 13/19頁 |
| 文件大小： | 234K |
| 代理商： | OPA3682U |
13
OPA3682
APPLICATIONS INFORMATION
WIDEBAND BUFFER OPERATION
The OPA3682 gives the exceptional AC performance of a
wideband, current-feedback op amp with a highly linear,
high power output stage. It features internal R
F
and R
G
resistors which make it easy to select a gain of +2, +1 or
–1 without external resistors. Requiring only 6mA/ch quies-
cent current, the OPA3682 will swing to within 1V of either
supply rail and deliver in excess of 135mA guaranteed at
room temperature. This low output headroom requirement,
along with supply voltage independent biasing, gives re-
markable single (+5V) supply operation. The OPA3682 will
deliver greater than 200MHz bandwidth driving a 2Vp-p
output into 100
on a single +5V supply. Previous boosted
output stage amplifiers have typically suffered from very
poor crossover distortion as the output current goes through
zero. The OPA3682 achieves a comparable power gain with
much better linearity.
Figure 1 shows the DC-coupled, gain of +2, dual power
supply circuit configuration used as the basis of the
±
5V
Specifications and Typical Performance Curves. For test
purposes, the input impedance is set to 50
with a resistor
to ground and the output impedance is set to 50
with a
series output resistor. Voltage swings reported in the speci-
fications are taken directly at the input and output pins
while load powers (dBm) are defined at a matched 50
load. For the circuit of Figure 1, the total effective load will
be 100
|| 800
= 89
. The disable control line (DIS) is
typically left open to guarantee normal amplifier operation.
In addition to the usual power supply decoupling capacitors
to ground, a 0.1
μ
F capacitor can be included between the
two power supply pins. This optional capacitor will typi-
cally improve the 2nd harmonic distortion performance by
3dB to 6dB.
FIGURE 1. DC-Coupled, G = +2, Bipolar Supply, Specifi-
cation and Test Circuit.
FIGURE 2. AC-Coupled, G = +2, Single-Supply Specifica-
tion and Test Circuit.
Figure 2 shows the AC-coupled, gain of +2, single-supply
circuit configuration used as the basis of the +5V Specifica-
tions and Typical Performance Curves. Though not a “rail-
to-rail” design, the OPA3682 requires minimal input and
output voltage headroom compared to other very wideband,
current-feedback op amps. It will deliver a 3Vp-p output
swing on a single +5V supply with greater than 150MHz
bandwidth. The key requirement of broadband single-supply
operation is to maintain input and output signal swings
within the usable voltage ranges at both the input and the
output. The circuit in Figure 2 establishes an input midpoint
bias using a simple resistive divider from the +5V supply
(two 806
resistors). The input signal is then AC-coupled
into this midpoint voltage bias. The input voltage can swing
to within 1.5V of either supply pin, giving a 2Vp-p input
signal range centered between the supply pins. The input
impedance matching resistor (57.6
) used for testing 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) on
the output as well. Again, on a single +5V supply, the output
voltage can swing to within 1V of either supply pin while
delivering more than 75mA output current. A demanding
100
load to a midpoint bias is used in this characterization
circuit. The new output stage used in the OPA3682 can
deliver large bipolar output currents into this midpoint load
with minimal crossover distortion, as shown by the +5V
supply, 3rd harmonic distortion plots.
VIDEO RGB AMPLIFIER
The front page shows an RGB amplifier based on the
OPA3682. The package pinout supports a signal flow-through
PCB layout. The internal resistors simplify the PCB even
more, while maintaining good gain accuracy. For systems that
need to conserve power, the total supply current for the
disabled OPA3682 is only 0.9mA.
1/3
OPA3682
+5V
–5V
50
Load
50
50
50
Source
R
G
400
R
F
400
+
6.8
μ
F
0.1
μ
F
+
6.8
μ
F
0.1
μ
F
DIS
V
IN
1/3
OPA3682
+5V
+V
S
DIS
V
S
/2
806
100
V
O
V
IN
806
R
G
400
R
F
400
0.1
μ
F
0.1
μ
F
+
6.8
μ
F
0.1
μ
F
50
Source
57.6
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| OPA404KU | 256K, 32K X 8, 2.5V HI-SPEED SER EE, -40C to +85C, 8-PDIP, TUBE |
| OPA4650 | Wideband, Low Power, Quad Voltage Feedback OPERATIONAL AMPLIFIER |
| OPA4650P | Wideband, Low Power, Quad Voltage Feedback OPERATIONAL AMPLIFIER |
| OPA4650U | Wideband, Low Power, Quad Voltage Feedback OPERATIONAL AMPLIFIER |
| OPA4684ID | Quad, Low-Power, Current-Feedback OPERATIONAL AMPLIFIER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OPA3682U/2K5 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog Buffer/Voltage Follower |
| OPA3684 | 制造商:BB 制造商全稱:BB 功能描述:Quad, Low-Power, Current-Feedback OPERATIONAL AMPLIFIER |
| OPA3684ID | 功能描述:高速運算放大器 Low-Power Triple 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(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| OPA3684ID | 制造商:Texas Instruments 功能描述:OPERATIONAL AMPLIFIER ((NW)) 制造商:Texas Instruments 功能描述:IC, OP-AMP, 250MHZ, 780V/ uS, SOIC-14 |
| OPA3684IDBQ | 制造商:BB 制造商全稱:BB 功能描述:Low-Power, Triple Current-Feedback OPERATIONAL AMPLIFIER With Disable |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。