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參數(shù)資料
| 型號： | LTC6406CUD#PBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 6/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DIFF AMP/DRIVER R-R 16-QFN |
| 標(biāo)準(zhǔn)包裝： | 121 |
| 類型： | ADC 驅(qū)動(dòng)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) |
LTC6406
14
6406fc
APPLICATIONS INFORMATION
General Amplier Applications
As levels of integration have increased and correspond-
ingly, system supply voltages decreased, there has been
a need for ADCs to process signals differentially in order
to maintain good signal to noise ratios. These ADCs are
typically supplied from a single supply voltage which can
be as low as 3V, and will have an optimal common mode
input range of 1.25V or 1.5V. The LTC6406 makes interfac-
ing to these ADCs easy, by providing both single-ended
to differential conversion as well as common mode level
shifting. The front page of this data sheet shows a typical
application. The gain to VOUTDIFF from VINM and VINP is:
V
OUTDIFF = V
+OUT –V–OUT ≈
R
F
R
I
V
INP –VINM
()
Note from the above equation, the differential output volt-
age (V+OUT – V–OUT) is completely independent of input
and output common mode voltages, or the voltage at
the common mode pin. This makes the LTC6406 ideally
suited for preamplication, level shifting and conversion
of single-ended signals to differential output signals in
preparation for driving differential input ADCs.
Effects of Resistor Pair Mismatch
Figure 3 shows a circuit diagram which takes into consid-
eration that real world resistors will not match perfectly.
Assuming innite open-loop gain, the differential output
relationship is given by the equation:
V
OUTDIFF = V
+OUT –V–OUT
R
F
R
I
V
INDIFF +
Δβ
β
AVG
V
ICM –
Δβ
β
AVG
V
OCM
where:
RF is the average of RF1, and RF2, and RI is the average
of RI1, and RI2.
βAVG is dened as the average feedback factor from the
outputs to their respective inputs:
β
AVG =
1
2
R
I1
R
I1 + RF1
+
R
I2
R
I2 + RF2
Δβ is dened as the difference in feedback factors:
Δβ =
R
I2
R
I2 + RF2
–
R
I1
R
I1 + RF1
VICM is dened as the average of the two input voltages
VINP, and VINM (also called the input common mode
voltage):
V
ICM =
1
2
V
INP + VINM
()
and VINDIFF is dened as the difference of the input voltages:
VINDIFF = VINP – VINM
VOCM is dened as the average of the two output voltages
V+OUT and V–OUT:
V
OCM =
V+OUT + V–OUT
2
When the feedback ratios mismatch (
Δβ), common mode
to differential conversion occurs.
Setting the differential input to zero (VINDIFF = 0), the de-
gree of common mode to differential conversion is given
by the equation:
V
OUTDIFF = V
+OUT –V–OUT ≈ VICM –VOCM
() Δβ
β
AVG
Figure 3. Real-World Application with Feedback Resistor
Pair Mismatch
–
+
RF2
V–OUT
V+OUT
VVOCM
VOCM
6406 F03
RF1
RI2
RI1
+
–
VINP
–
+
VINM
V–IN
V+IN
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| LTC6406CUD-TRPBF | 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 |
| LTC6406IMS8E#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(biāo)準(zhǔn)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 |
| LTC6406IMS8E#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(biāo)準(zhǔn)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 |
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