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参数资料
| 型号： | LT1567 |
| 厂商： | Linear Technology Corporation |
| 英文描述： | 1.4nV/?Hz 175MHz Op Amp and Inverter / Filter Building Block |
| 中文描述： | 1.4nV /？赫兹175MHz时运算放大器和逆变器/滤波器积木 |
| 文件页数： | 5/8页 |
| 文件大小： | 138K |
| 代理商： | LT1567 |
LT1567
5
Functional Description
The LT1567 contains two low-noise wideband operational
amplifiers, one of them connected internally as a unity-
gain inverter. These two amplifiers can form a second-
order multiple-feedback filter configuration (Figure 1) for
megahertz signal frequencies, with exceptionally low total
noise. The amplifier in the dedicated inverter (INV) is
optimized for better high frequency linearity while the
uncommitted operational amplifier (OA) is optimized for
lower input noise voltage, according to the different
sensitivities to these effects in the filter section. This
combination produces a low-noise filter with better distor-
tion performance than would be possible with identical
amplifiers.
Signal Ground
Both operational amplifiers within the LT1567 are de-
signed for inverting operation (constant common mode
input) and they share a single ground reference node on
the chip. Two pins permit access to this node: GND and
BYPASS. For a clean on-chip ground reference over a wide
bandwidth, the normal procedure is to connect GND to a
DC ground potential and BYPASS to a decoupling capaci-
tor that returns to a ground plane.
Differential Output Feature
The multiple-feedback filter section of Figure 1 inherently
includes two outputs of opposite signal polarity: a DC-
inverting output from the OA (Pin 1) and a DC noninverting
output from the INV block (Pin 7). These two outputs
maintain equal gain and 180o phase shift over a wide
frequency range. This feature permits choosing the signal
polarity in single-ended applications, and also performs
single-ended-to-differential conversion. The latter prop-
erty is useful in an antialias filter to drive standard mono-
lithic A/D converters having differential inputs, as illus-
trated on page 1.
Dealing with High Source Impedances
The voltage V
IN
in Figure 1 , on the left side of R1, is the
signal voltage that the filter sees. If a voltage source with
significant internal impedance drives the V
IN
node in
Figure 1, then the filter input V
IN
may differ from the
source’s open-circuit output, and the difference can be
complex, because the filter presents a complex imped-
ance to V
IN
. A rule of thumb is that a source impedance is
negligibly “low” if it is much smaller than R1 at frequencies
of interest. Otherwise, the source impedance (resistive or
reactive) effectively adds to R1 and may change the signal
frequency response compared to that with a low source
impedance. If the source is resistive and predictable, then
it may be possible to design for it by reducing R1.
Unpredictable or nonresistive source impedances that are
not well below R1 should be buffered.
Construction and Instrumentation Cautions
Electrically clean construction is important in applications
seeking the full dynamic range and bandwidth of the
LT1567. Using the shortest possible wiring or printed-
circuit paths will minimize parasitic capacitance and in-
ductance. High quality supply bypass capacitors of 0.1
μ
F
near the chip, connected to a ground plane, provide good
decoupling from a clean, low inductance power source.
But several inches of wire (i.e., a few microhenrys of
inductance) from the power supplies, unless decoupled
by substantial capacitance (
≥
10
μ
F) near the chip, can
cause a high Q LC resonance in the hundreds of kHz in the
chip’s supplies or ground reference. This may impair filter
performance at those frequencies. In stringent filter appli-
cations we have often found that a compact, carefully laid
out printed circuit board with good ground plane makes a
difference in both stopband rejection and distortion.
Finally, equipment to measure filter performance can itself
introduce distortion or noise floors. Checking for these
limits with a wire replacing the filter is a prudent routine
procedure.
APPLICATIU
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| LT1567_1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.4nV/√Hz 180MHz Filter Building Block |
| LT1567CMS8 | 功能描述:IC OPAMP/INV BUILDNG BLOCK 8MSOP RoHS:否 类别:集成电路 (IC) >> 线性 - 放大器 - 专用 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:60 系列:- 类型:可变增益放大器 应用:CATV 安装类型:表面贴装 封装/外壳:20-WQFN 裸露焊盘 供应商设备封装:20-TQFN-EP（5x5） 包装:托盘 |
| LT1567CMS8#PBF | 功能描述:IC OPAMP/INV BUILDNG BLOCK 8MSOP RoHS:是 类别:集成电路 (IC) >> 线性 - 放大器 - 专用 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:60 系列:- 类型:可变增益放大器 应用:CATV 安装类型:表面贴装 封装/外壳:20-WQFN 裸露焊盘 供应商设备封装:20-TQFN-EP（5x5） 包装:托盘 |
| LT1567CMS8#TR | 功能描述:IC OPAMP/INV BUILDNG BLOCK 8MSOP RoHS:否 类别:集成电路 (IC) >> 线性 - 放大器 - 专用 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:60 系列:- 类型:可变增益放大器 应用:CATV 安装类型:表面贴装 封装/外壳:20-WQFN 裸露焊盘 供应商设备封装:20-TQFN-EP（5x5） 包装:托盘 |
| LT1567CMS8#TRPBF | 功能描述:IC OPAMP/INV BUILDNG BLOCK 8MSOP RoHS:是 类别:集成电路 (IC) >> 线性 - 放大器 - 专用 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:60 系列:- 类型:可变增益放大器 应用:CATV 安装类型:表面贴装 封装/外壳:20-WQFN 裸露焊盘 供应商设备封装:20-TQFN-EP（5x5） 包装:托盘 |
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