参数资料
| 型号： | LTC6404IUD-1#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 18/28页 |
| 文件大小： | 0K |
| 描述： | IC AMP/DRIVER DIFF 16-QFN |
| 标准包装： | 2,500 |
| 类型： | ADC 驱动器 |
| 应用： | 数据采集 |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WFQFN 裸露焊盘 |
| 供应商设备封装： | 16-QFN-EP（3x3） |
| 包装： | 带卷 (TR) |
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LTC6404
25
6404f
APPLICATIONS INFORMATION
The LTC6404’s input referred voltage noise contributes the
equivalent noise of a 140
Ω resistor. When the feedback
network is comprised of resistors whose values are less
than this, the LTC6404’s output noise is voltage noise
dominant (See Figure 10.):
ee
R
no
ni
F
I
≈+
1
Feedback networks consisting of resistors with values
greater than about 200
Ω will result in output noise which
is resistor noise and amplier current noise dominant.
eI
R
kT R
no
n
F
I
F
≈
() ++
21
4
2
Lower resistor values (<100
Ω)alwaysresultinlowernoise
at the penalty of increased distortion due to increased load-
ing of the feedback network on the output. Higher resistor
values (but still less than 400
Ω) will result in higher output
noise, but improved distortion due to less loading on the
output. The optimal feedback resistance for the LTC6404
runs between 100
Ω to 400Ω. Higher resistances are not
recommended.
The differential ltered outputs OUTF+ and OUTF– will have
a little higher spot noise than the unltered outputs (due to
the two 50
Ω resistors which contribute 0.9nV/√Hz each),
but actually will provide superior Signal-to-Noise in noise
bandwidths exceeding 139MHz due to the noise-ltering
function the lter provides.
Layout Considerations
Because the LTC6404 is a very high speed amplier, it is
sensitive to both stray capacitance and stray inductance.
Three pairs of power supply pins are provided to keep the
power supply inductance as low as possible to prevent
degradation of amplier 2nd Harmonic performance. It is
critical that close attention be paid to supply bypassing. For
single supply applications (Pins 3, 9 and 12 grounded) it
is recommended that 3 high quality 0.1μF surface mount
ceramic bypass capacitor be placed between pins 2 and
3, between pins 11and 12, and between pins10 and 9 with
direct short connections. Pins 3, 9 and 10 should be tied
directly to a low impedance ground plane with minimal
routing. For dual (split) power supplies, it is recommended
that at least two additional high quality, 0.1μF ceramic
capacitors are used to bypass pin V+ to ground and V– to
ground, again with minimal routing. For driving large loads
(<200
Ω),additionalbypasscapacitancemaybeneededfor
optimal performance. Keep in mind that small geometry
(e.g. 0603) surface mount ceramic capacitors have a much
higher self resonant frequency than do leaded capacitors,
and perform best in high speed applications.
Any stray parasitic capacitances to ground at the sum-
ming junctions IN+, and IN– should be kept to an absolute
minimum even if it means stripping back the ground plane
away from any trace attached to this node. This becomes
especially true when the feedback resistor network uses
resistor values >400
Ω in circuits with RF = RI. Excessive
peaking in the frequency response can be mitigated by add-
ing small amounts of feedback capacitance (0.5pF to 2pF)
around RF. Always keep in mind the differential nature of
the LTC6404, and that it is critical that the load impedances
seen by both outputs (stray or intended) should be as bal-
anced and symmetric as possible. This will help preserve
the natural balance of the LTC6404, which minimizes the
generation of even order harmonics, and preserves the
rejection of common mode signals and noise.
It is highly recommended that the VOCM pin be either hard
tied to a low impedance ground plane (in split supply
applications), or bypassed to ground with a high quality
ceramic capacitor whose value exceeds 0.01μF. This will
help stabilize the common mode feedback loop as well as
prevent thermal noise from the internal voltage divider and
Figure 10. LTC6404-1 Output Spot Noise vs Spot Noise
Contributed by Feedback Network Alone
RF = RI (Ω)
10
0.1
nV
/√Hz
1
10
100
1k
10k
6404 F10
FEEDBACK RESISTOR
NETWORK NOISE ALONE
TOTAL (AMPLIFIER AND
FEEDBACK NETWORK)
OUTPUT NOISE
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC6404IUD-2#PBF | 功能描述:IC AMP/DRIVER DIFF 16-QFN 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 |
| LTC6404IUD-2#TRPBF | 功能描述:IC AMP/DRIVER DIFF 16-QFN 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 |
| LTC6404IUD-2-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:600MHz, Low Noise, High Precision Fully Differential Input/Output Amplifi er/Driver |
| LTC6404IUD-2-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:600MHz, Low Noise, High Precision Fully Differential Input/Output Amplifi er/Driver |
| LTC6404IUD-4#PBF | 功能描述:IC AMP/DRIVER DIFF 16-QFN 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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