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參數(shù)資料
| 型號： | LTC6405IUD#PBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 8/26頁 |
| 文件大小： | 0K |
| 描述： | IC DIFF AMP/DRIVER R-R 16-QFN |
| 標準包裝： | 121 |
| 類型： | ADC 驅(qū)動器 |
| 應(yīng)用： | 數(shù)據(jù)采集 |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-WFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 16-QFN-EP（3x3） |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁面： | 1323 (CN2011-ZH PDF) |
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LTC6405
16
6405fb
For more information www.linear.com/6405
applications inForMation
In general, the degree of feedback pair mismatch is a
source of common mode to differential conversion of both
signalsandnoise.Using1%resistorsorbetterwillmitigate
most problems, and will provide about 34dB worst case of
commonmoderejection.Using0.1%resistorswillprovide
about 54dB of common mode rejection. A low impedance
ground plane should be used as a reference for both the
input signal source and the VOCM pin. Bypassing the VOCM
with a high quality 0.1F ceramic capacitor to this ground
planewillfurtherhelppreventcommonmodesignalsfrom
being converted to differential signals.
There may be concern on how feedback factor mismatch
affects distortion. Feedback factor mismatch from using
1%resistorsorbetter,hasanegligibleeffectondistortion.
However, in single supply level shifting applications where
there is a voltage difference between the input common
mode voltage and the output common mode voltage,
resistor mismatch can make the apparent voltage offset
of the amplifier appear worse than specified.
The apparent input referred offset induced by feedback
factor mismatch is derived from the above equation:
VOSDIFF(APPARENT) ≈ (VICM – VOCM) b
Using the LTC6405 in a single supply application on a
single 5V supply with 1% resistors, and the input common
mode grounded, with the VOCM pin biased at 2.5V, the
worst case DC offset can induce 25mV of apparent offset
voltage. With 0.1% resistors, the worst case apparent
offset reduces to 2.5mV.
Input Impedance and Loading Effects
The input impedance looking into the VINP or VINM input
of Figure 1 depends on whether or not the sources VINP
and VINM are fully differential or not. For balanced input
sources (VINP=–VINM),theinputimpedanceseenateither
input is simply:
RINP = RINM = RI
For single ended inputs, because of the signal imbalance
at the input, the input impedance actually increases over
thebalanceddifferentialcase.Theinputimpedancelooking
into either input is:
RINP =RINM =
RI
1–
1
2
RF
RI +RF
Inputsignalsourceswithnon-zerooutputimpedancescan
alsocausefeedbackimbalancebetweenthepairoffeedback
networks. For the best performance, it is recommended
that the input source output impedance be compensated
for. If input impedance matching is required by the source,
a termination resistor R1 should be chosen (see Figure 4):
R1
=
RINM RS
RINM –RS
According to Figure 4, the input impedance looking into
Figure 4. Optimal Compensation for Signal Source Impedance
VS
+
–
+
RF
RI
RINM
RS
RI
R2 = RS || R1
R1 CHOSEN SO THAT R1 || RINM = RS
R2 CHOSEN TO BALANCE R1 || RS
R1
6405 F04
thedifferentialamp(RINM)reflectsthesingleendedsource
case, thus:
RINM =
RI
1–
1
2
RF
RI +RF
R2 is chosen to equal R1 || RS:
R2
=
R1RS
R1
+RS
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| LTC6405IUD-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:2.7GHz, 5V, Low Noise, Rail-to-Rail Input Differential Amplifi er/Driver |
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| LTC6406CMS8E#PBF | 功能描述:IC AMP/DRIVER DIFF 8-MSOP RoHS:是 類別:集成電路 (IC) >> 線性 - 放大器 - 專用 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:60 系列:- 類型:可變增益放大器 應(yīng)用:CATV 安裝類型:表面貼裝 封裝/外殼:20-WQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:20-TQFN-EP（5x5） 包裝:托盤 |
| LTC6406CMS8E#TRPBF | 功能描述:IC AMP/DRIVER DIFF 8-MSOP RoHS:是 類別:集成電路 (IC) >> 線性 - 放大器 - 專用 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:60 系列:- 類型:可變增益放大器 應(yīng)用:CATV 安裝類型:表面貼裝 封裝/外殼:20-WQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:20-TQFN-EP（5x5） 包裝:托盤 |
| LTC6406CMS8E-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:3GHz, Low Noise, Rail-to-Rail Input Differential Amplifi er/Driver |
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