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參數(shù)資料
| 型號(hào)： | LTC6405CMS8E#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 模擬信號(hào)調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO8 |
| 封裝： | LEAD FREE, PLASTIC, MSOP-8 |
| 文件頁數(shù)： | 7/24頁 |
| 文件大?。?/td> | 281K |
| 代理商： | LTC6405CMS8E#PBF |
LTC6405
15
6405fa
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 LTC6405 makes interfac-
ing to these ADCs easy, by providing both single-ended
to differential conversion as well as common mode level
shifting. 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 LTC6405 ideally suited
for pre-amplication, 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
Δ
β is dened as the difference in feedback factors:
Δβ =
R
I2
R
I2 + RF2
–
R
I1
R
I1 + RF1
VICM isdenedastheaverageofthetwoinputvoltagesVINP
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 + VOUT
2
When the feedback ratios mismatch (Δ
β), 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
6405 F03
RF1
RI2
RI1
+
–
VINP
–
+
VINM
V–IN
V+IN
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC6405CMS8E-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 |
| LTC6405CUD | 制造商:Linear Technology 功能描述:DIFF AMP 5V 2.7GHZ R/R 16QFN 制造商:Linear Technology 功能描述:DIFF AMP, 5V, 2.7GHZ, R/R, 16QFN |
| LTC6405CUD#PBF | 功能描述:IC DIFF AMP/DRIVER R-R 16-QFN 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?cè)鲆娣糯笃?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 |
| LTC6405CUD#TR | 制造商:Linear Technology 功能描述:DIFF-AMPLIFIER, 2.7GHZ, 690V/US, QFN-16, No. of Amplifiers:1, Input Offset Voltage:6mV, Bandwidth:2.7GHz, Amplifier Case Style:QFN, No. of Pins:16, Supply Voltage Range:4.5V to 5.25V, Slew Rate:690V/s, Supply Current:18mA, MSL:- , RoHS Compliant: No |
| LTC6405CUD#TRPBF | 功能描述:IC DIFF AMP/DRIVER R-R 16-QFN 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?cè)鲆娣糯笃?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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