参数资料
| 型号： | EL8302IU-T7 |
| 厂商： | Intersil |
| 文件页数： | 14/14页 |
| 文件大小： | 0K |
| 描述： | IC OP AMP 500MHZ R-R 16-QSOP |
| 标准包装： | 1,000 |
| 放大器类型： | 电压反馈 |
| 电路数： | 3 |
| 输出类型： | 满摆幅 |
| 转换速率： | 600 V/µs |
| 增益带宽积： | 200MHz |
| -3db带宽： | 500MHz |
| 电流 - 输入偏压： | 6µA |
| 电压 - 输入偏移： | 800µV |
| 电流 - 电源： | 5.6mA |
| 电流 - 输出 / 通道： | 65mA |
| 电压 - 电源，单路/双路(±)： | 3 V ~ 5 V，±1.5 V ~ 2.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-QSOP |
| 包装： | 带卷 (TR) |
9
Simplified Schematic Diagram
Description of Operation and Application
Information
Product Description
The EL8302 is wide bandwidth, single supply, low power and
rail-to-rail output voltage feedback operational amplifiers.
The amplifiers are internally compensated for closed loop
gain of +1 of greater. Connected in voltage follower mode
and driving a 1k
load, the EL8302 has a -3dB bandwidth of
500MHz. Driving a 150
load, the bandwidth is about
350MHz while maintaining a 600V/us slew rate. The EL8302
is available with a power down pin for each channel to
reduce power to 30A typically while the amplifier is
disabled.
Input, Output and Supply Voltage Range
The EL8302 has been designed to operate with a single
supply voltage from 3V to 5.0V. Split supplies can also be
used as long as their total voltage is within 3V to 5.0V. The
amplifiers have an input common mode voltage range from
0.15V below the negative supply (VS- pin) to within 1.5V of
the positive supply (VS+ pin). If the input signal is outside the
above specified range, it will cause the output signal to be
distorted.
The output of the EL8302 can swing rail to rail. As the load
resistance becomes lower, the ability to drive close to each
rail is reduced. For the load resistor 1k
, the output swing is
about 4.9V at a 5V supply. For the load resistor 150
, the
output swing is about 4.6V.
Choice of Feedback Resistor and Gain Bandwidth
Product
For applications that require a gain of +1, no feedback
resistor is required. Just short the output pin to the inverting
input pin. For gains greater than +1, the feedback resistor
forms a pole with the parasitic capacitance at the inverting
input. As this pole becomes smaller, the amplifier’s phase
margin is reduced. This causes ringing in the time domain
and peaking in the frequency domain. Therefore, RF has
some maximum value that should not be exceeded for
optimum performance. If a large value of RF must be used, a
small capacitor in the few pF range in parallel with RF can
help to reduce the ringing and peaking at the expense of
reducing the bandwidth.
As far as the output stage of the amplifier is concerned, the
output stage is also a gain stage with the load. RF and RG
appear in parallel with RL for gains other than +1. As this
combination gets smaller, the bandwidth falls off.
Consequently, RF also has a minimum value that should not
be exceeded for optimum performance. For gain of +1, RF=0
is optimum. For the gains other than +1, optimum response
is obtained with RF between 300 to 1k.
The EL8302 has a gain bandwidth product of 200MHz. For
gains
≥5, its bandwidth can be predicted by the following
equation:
Video Performance
For good video performance, an amplifier is required to
maintain the same output impedance and the same
frequency response as DC levels are changed at the output.
This is especially difficult when driving a standard video load
of 150
, because the change in output current with DC level.
Special circuitry has been incorporated in the EL8302 to
reduce the variation of the output impedance with the current
output. This results in dG and dP specifications of 0.01%
and 0.01
°, while driving 150 at a gain of 2. Driving high
impedance loads would give a similar or better dG and dP
performance.
IN+
IN-
I1
I2
R6
R3
R1
R2
Q1
Q2
R7
VBIAS1
Q5
Q6
R8
Q7
Q8
R9
Q3
Q4
R4
R5
VS-
OUT
VBIAS2
VS+
DIFFERENTIAL TO
DRIVE
GENERATOR
SINGLE ENDED
Gain
BW
×
200MHz
=
EL8302
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