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參數(shù)資料
| 型號： | EL2276CSZ-T7 |
| 廠商： | Intersil |
| 文件頁數(shù)： | 14/14頁 |
| 文件大小： | 0K |
| 描述： | IC OP AMP CMF DUAL 5V 14-SOIC |
| 標(biāo)準(zhǔn)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) |
9
Applications Information
Product Description
The EL2276 is a current-feedback operational amplifier that
offers a wide -3dB bandwidth of 70MHz, a low supply current
of 1mA per amplifier and the ability to disable to 0mA. This
product also features high output current drive. The EL2276
can output 55mA per amplifier. The EL2276 works with
supply voltages ranging from a single 3V to ±6V, and it is
also capable of swinging to with in 1V of either supply on the
input and the output. Because of its current-feedback
topology, the EL2276 does not have the normal gain-
bandwidth product associated with voltage-feedback
operational amplifier. This allows its -3dB bandwidth to
remain relatively constant as closed-loop gain is increased.
This combination of high bandwidth and low power, together
with aggressive pricing make the EL2276 the ideal choice for
many low-power/high-bandwidth applications such as
portable computing, HDSL, and video processing.
Power Supply Bypassing and Printed Circuit
Board Layout
As with any high-frequency device, good printed circuit
board layout is necessary for optimum performance. Ground
plane construction is highly recommended. Lead lengths
should be as short as possible. The power supply pins must
be well bypassed to reduce the risk of oscillation. The
combination of a 4.7F tantalum capacitor in parallel with a
0.1F capacitor has been shown to work well when placed at
each supply pin.
For good AC performance, parasitic capacitance should be
kept to a minimum especially at the inverting input (see the
Capacitance at the Inverting Input section). Ground plane
construction should be used, but it should be removed from
the area near the inverting input to minimize any stray
capacitance at that node. Carbon or Metal-Film resistors are
acceptable with the Metal-Film resistors giving slightly less
peaking and bandwidth because of their additional series
inductance. Use of sockets, particularly for the SO package
should be avoided if possible. Sockets add parasitic
inductance and capacitance which will result in some
additional peaking and overshoot.
Disable/Power-Down
The EL2276 amplifier can be disabled, placing its output in a
high-impedance state. When disabled, the amplifier's supply
current is reduced to 0mA. The EL2276 amplifier is disabled
when its ENABLE pin is floating or pulled up to within 0.5V of
the positive supply. Similarly, the amplifier is enabled by
pulling its ENABLE pin at least 3V below the positive supply.
For ±5V supplies, this means that an EL2276 amplifier will
be enabled when ENABLE is at 2V or less, and disabled
when ENABLE is above 4.5V. Although the logic levels are
not standard TTL, this choice of logic voltages allows the
EL2276 to be enabled by tying ENABLE to ground, even in
+3V single-supply applications. The ENABLE pin can be
driven from CMOS outputs or open-collector TTL.
When enabled, supply current does vary somewhat with the
voltage applied at ENABLE. For example, with the supply
voltages of the EL2276 at ±5V, if ENABLE is tied to -5V
(rather than ground) the supply current will increase about
15% to 2.3mA.
Capacitance at the Inverting Input
Any manufacturer's high-speed voltage- or current-feedback
amplifier can be affected by stray capacitance at the
inverting input. For inverting gains this parasitic capacitance
has little effect because the inverting input is a virtual
ground, but for non-inverting gains this capacitance (in
conjunction with the feedback and gain resistors) creates a
pole in the feedback path of the amplifier. This pole, if low
enough in frequency, has the same destabilizing effect as a
zero in the forward open-loop response. The use of large
value feedback and gain resistors further exacerbates the
problem by further lowering the pole frequency.
The EL2276 has been specially designed to reduce power
dissipation in the feedback network by using large 1.0k
feedback and gain resistors. With the high bandwidths of this
amplifier, these large resistor values would normally cause
stability problems when combined with parasitic
capacitance, but by internally canceling the effects of a
nominal amount of parasitic capacitance, the EL2276
remains very stable. For less experienced users, this feature
makes the EL2276 much more forgiving, and therefore
easier to use than other products not incorporating this
proprietary circuitry.
The experienced user with a large amount of PC board
layout experience may find in rare cases that the EL2276
has less bandwidth than expected. In this case, the inverting
input may have less parasitic capacitance than expected by
the internal compensation circuitry of the EL2276. The
reduction of feedback resistor values (or the addition of a
very small amount of external capacitance at the inverting
input, e.g., 0.5pF) will increase bandwidth as desired. Please
see the curves for Frequency Response for Various RF and
RG, and Frequency Response for Various CIN-.
EL2276
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