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| 型號： | EL2276CSZ-T7 |
| 廠商： | Intersil |
| 文件頁數(shù)： | 2/14頁 |
| 文件大小： | 0K |
| 描述： | IC OP AMP CMF DUAL 5V 14-SOIC |
| 標準包裝： | 1,000 |
| 放大器類型： | 電流反饋 |
| 電路數(shù)： | 2 |
| 轉(zhuǎn)換速率： | 800 V/µs |
| -3db帶寬： | 70MHz |
| 電流 - 輸入偏壓： | 4µA |
| 電壓 - 輸入偏移： | 2500µV |
| 電流 - 電源： | 1mA |
| 電流 - 輸出 / 通道： | 55mA |
| 電壓 - 電源，單路/雙路(±)： | 3 V ~ 12 V，±1.5 V ~ 6 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 14-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 14-SOIC |
| 包裝： | 帶卷 (TR) |
10
Feedback Resistor Values
The EL2276 has been designed and specified at gains of +1
and +2 with RF = 1.0k. This value of feedback resistor
gives 70MHz of -3dB bandwidth at AV = +1 with about 1.5dB
of peaking, and 60MHz of -3dB bandwidth at AV = +2 with
about 0.5dB of peaking. Since the EL2276 is current-
feedback amplifier, it is also possible to change the value of
RF to get more bandwidth. As seen in the curve of
Frequency Response For Various RF and RG, bandwidth
and peaking can be easily modified by varying the value of
the feedback resistor.
Because the EL2276 is a current-feedback amplifier, the
gain-bandwidth product is not a constant for different closed-
loop gains. This feature actually allows the EL2276 to
maintain about the same -3dB bandwidth, regardless of
closed-loop gain. However, as closed-loop gain is increased,
bandwidth decreases slightly while stability increases.
Since the loop stability is improving with higher closed-loop
gains, it becomes possible to reduce the value of RF below
the specified 1.0k
and still retain stability, resulting in only a
slight loss of bandwidth with increased closed-loop gain.
Supply Voltage Range and Single-Supply
Operation
The EL2276 has been designed to operate with supply
voltages having a span of greater than 3V, and less than
12V. In practical terms, this means that the EL2276 will
operate on dual supplies ranging from ±1.5V to ±6V.
As supply voltages continue to decrease, it becomes
necessary to provide input and output voltage ranges that
can get as close as possible to the supply voltages. The
EL2276 has an input voltage range that extends to within 1V
of either supply. So, for example, on a single +5V supply, the
EL2276 has an input range which spans from 1V to 4V. The
output range of the EL2276 is also quite large, extending to
within 1V of the supply rail. On a ±5V supply, the output is
therefore capable of swinging from -4V to +4V. Single-
supply output range is even larger because of the increased
negative swing due to the external pull-down resistor to
ground. On a single +5V supply, output voltage range is
about 0.3V to 4V.
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 of the change in output current with DC
level. Until the EL2276, good Differential Gain could only be
achieved by running high idle currents through the output
transistors (to reduce variations in output impedance).
These currents were typically in excess of the entire 1mA
supply current of the EL2276 amplifier! Special circuitry has
been incorporated in the EL2276 to reduce the variation of
output impedance with current output. This results in dG and
dP specifications of 0.15% and 0.15° while driving 150
at a
gain of +2.
Video Performance has also been measured with a 500
load at a gain of +1. Under these conditions, the EL2276 has
dG and dP specifications of 0.01% and 0.02° respectively
while driving 500
at AV = +1.
Output Drive Capability
Each amplifier of the EL2276 is capable of providing a
minimum of ±50mA. These output drive levels are
unprecedented in amplifiers running at these supply
currents. The ±50mA minimum output drive of each EL2276
amplifier allows swings of ±2.5V into 50
loads.
Driving Cables and Capacitive Loads
When used as a cable driver, double termination is always
recommended for reflection-free performance. For those
applications, the back-termination series resistor will
decouple the EL2276 from the cable and allow extensive
capacitive drive. However, other applications may have high
capacitive loads without a back-termination resistor. In these
applications, a small series resistor (usually between 5
and
50
) can be placed in series with the output to eliminate
most peaking. The gain resistor (RG) can then be chosen to
make up for any gain loss which may be created by this
additional resistor at the output. In many cases it is also
possible to simply increase the value of the feedback
resistor (RF) to reduce the peaking.
Current Limiting
The EL2276 has no internal current-limiting circuitry. If any
output is shorted, it is possible to exceed the Absolute
Maximum Ratings for output current or power dissipation,
potentially resulting in the destruction of the device.
Power Dissipation
With the high output drive capability of the EL2276, it is
possible to exceed the 150°C Absolute Maximum junction
temperature under certain very high load current conditions.
Generally speaking, when RL falls below about 25, it is
important to calculate the maximum junction temperature
(TJmax) for the application to determine if power-supply
voltages, load conditions, or package type need to be
modified for the EL2276 to remain in the safe operating area.
These parameters are calculated as follows:
TJMAX = TMAX + (θJA * n * PDMAX)
where:
TMAX=Maximum Ambient Temperature
θ
JA =Thermal Resistance of the Package
n=Number of Amplifiers in the Package
PDMAX=Maximum Power Dissipation of each Amplifier in
the Package
EL2276
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