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參數(shù)資料
| 型號(hào)： | ISL28291FBZ |
| 廠商： | Intersil |
| 文件頁(yè)數(shù)： | 3/18頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC OP AMP R-R DUAL ULN 8-SOIC |
| 標(biāo)準(zhǔn)包裝： | 97 |
| 放大器類型： | 電壓反饋 |
| 電路數(shù)： | 2 |
| 輸出類型： | 滿擺幅 |
| 轉(zhuǎn)換速率： | 17 V/µs |
| -3db帶寬： | 61MHz |
| 電流 - 輸入偏壓： | 3µA |
| 電壓 - 輸入偏移： | 270µV |
| 電流 - 電源： | 2.6mA |
| 電流 - 輸出 / 通道： | 130mA |
| 電壓 - 電源，單路/雙路(±)： | 3 V ~ 5.5 V，±1.5 V ~ 2.75 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SOIC |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁(yè)面： | 1235 (CN2011-ZH PDF) |
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ISL28191, ISL28291
11
FN6156.9
January 26, 2012
Applications Information
Product Description
The ISL28191 and ISL28291 are voltage feedback operational
amplifiers designed for communication and imaging applications
requiring low distortion, very low voltage and current noise. Both
parts feature high bandwidth while drawing moderately low supply
current. They use a classical voltage-feedback topology, which
allows them to be used in a variety of applications where current-
feedback amplifiers are not appropriate because of restrictions
placed upon the feedback element used with the amplifier.
Enable/Power-Down
The ISL28191 and ISL28291 amplifiers are disabled by applying
a voltage greater than 2V to the EN pin, with respect to the V- pin.
In this condition, the output(s) will be in a high impedance state
and the amplifier(s) current will be reduced to 13A/Amp. By
disabling the part, multiple parts can be connected together as a
MUX. The outputs are tied together in parallel and a channel can
be selected by the EN pin. The EN pin also has an internal pull-
down. If left open, the EN pin will pull to the negative rail and the
device will be enabled by default.
Input Protection
All input terminals have internal ESD protection diodes to both
positive and negative supply rails, limiting the input voltage to
within one diode beyond the supply rails. Both parts have
additional back-to-back diodes across the input terminals (as
shown in Figure 30). In pulse applications where the input Slew
Rate exceeds the Slew Rate of the amplifier, the possibility exists
for the input protection diodes to become forward biased. This can
cause excessive input current and distortion at the outputs. If
overdriving the inputs is necessary, the external input current must
never exceed 5mA. An external series resistor may be used to limit
the current, as shown in Figure 30.
Using Only One Channel
The ISL28291 is a dual channel op amp. If the application only
requires one channel when using the ISL28291, the user must
configure the unused channel to prevent it from oscillating.
Oscillation can occur if the input and output pins are floating. This
will result in higher than expected supply currents and possible
noise injection into the channel being used. The proper way to
prevent this oscillation is to short the output to the negative input
and ground the positive input (as shown in Figure 31).
Power Supply Bypassing and Printed Circuit
Board Layout
As with any high frequency device, good printed circuit board
layout is necessary for optimum performance. Low impedance
ground plane construction is essential. Surface mount
components are recommended, but if leaded components are
used, 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 0.01F 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. When ground
plane construction is used, 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 additional series inductance. Use of sockets,
particularly for the SOIC package, should be avoided if possible.
Sockets add parasitic inductance and capacitance, which will
result in additional peaking and overshoot.
Current Limiting
The ISL28191 and ISL28291 have no internal current-limiting
circuitry. If the output is shorted, it is possible to exceed the
Absolute Maximum Rating for output current or power dissipation,
potentially resulting in the destruction of the device. This is why the
output short circuit current is specified and tested with RL = 10Ω.
FIGURE 30. LIMITING THE INPUT CURRENT TO LESS THAN 5mA
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+
R
FIGURE 31. PREVENTING OSCILLATIONS IN UNUSED CHANNELS
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