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參數(shù)資料
| 型號(hào)： | LT6350HDD#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | ADC |
| 英文描述： | 1-CH 16-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, PDSO8 |
| 封裝： | 3 X 3 MM, LEAD FREE, PLASTIC, MO-229WEED-1, DFN-8 |
| 文件頁數(shù)： | 5/28頁 |
| 文件大?。?/td> | 462K |
| 代理商： | LT6350HDD#TRPBF |
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LT6350
13
6350fb
+
–
+
–
+
–
+
–
RS
RG
RF
RINT
OUT1
OUT2
VIN
V1
V2
VA
+–
–IN1
+IN1
+IN2
OP AMP 1
OP AMP 2
6350 F03
8
1
2
4
5
Figure 3. General Conguration
Notice that the output common mode voltage is determined
simply by the voltage at +IN2. However, since the voltage
appliedat+IN2doesnotaffectthevoltageattheVOUT1output,
a differential offset voltage will develop for VA = 0 when V1
does not equal V2. The value of the offset voltage will be
2 (V1 – V2), as can be seen in Equation 2. For lowest
differential offset, therefore, the input signal to pin +IN1,
VIN, should be centered around the common mode voltage
applied to pin +IN2. Often this voltage is provided by the
ADC reference output. When the input is so centered and
V1 = V2, Equation 2 reduces to:
VOUTDIFF = 2 VA (1+RF/RG)
The simple connection described in the Basic Connections
section can be seen as a special case of the general circuit
in Figure 3 where RF is a short circuit, RG is an open circuit,
and the voltage at VIN is centered around the voltage V2. If
differential gain greater than two is needed, the values of RF
and RG can be adjusted in accordance with Equation (2).
Additional information about feedback networks is given
in the next section and in the Input Amplier (Op Amp 1)
Feedback Components section.
Inverting Gain Connections/Interfacing to High
Voltage Signals
Although the previous examples have assumed the input
signal is applied at +IN1, it is also possible to use the input
op amp in an inverting conguration by xing the voltage
VIN and applying the input signal at V1 of Figure 3. Using the
input op amp in the inverting conguration xes its input
common mode voltage at the voltage VIN, which allows the
input signal at V1 to traverse a swing beyond the LT6350
supply rails. To avoid unwanted differential offsets in this
conguration VIN should be chosen such that:
VIN = V2/(1+(RF/RG))
Then Equation (1) reduces to:
VOUTDIFF = –2 V1 (RF/RG))
Choosing RF = RG with the input at V1 leads to the gain
of –2 conguration.
A practical application for the inverting gain conguration is
interfacing a high voltage op amp to a 5V differential SAR
ADC.AsseeninFigure4,anindustrialapplicationmighthave
OPERATION
–
+
–
+
–
+
–
RF
RG
RINT
OUT1
OUTMAX
OUTMIN
OUT2
VIN
V2
OUTMAX
OUTMIN
OUTHV
V2
OUTHVMAX
OUTHVNOM
OUTHVMIN
–IN1
+IN1
+IN2
–15V
+15V
OP AMP 1
OP AMP 2
6350 F04
SIGNAL
HIGH VOLTAGE OP AMP
8
1
2
5
4
Figure 4. Interfacing to High Voltage Signals
sensed signals coming through an op amp running from
±15V rails. The LT6350 can easily interface the high voltage
opamptoa5VADCbyusingtheinvertinggainconguration.
For a clean interface, three conditions must be met:
1. VOUTDIFF = 0 when OUTHV is centered at OUTHVNOM.
2. VOUT1 = VOUTCM = V2 when OUTHV is centered at
OUTHVNOM.
3. Full-scale signals at OUTHV are translated at the
output of the LT6350 into the appropriate full-scale
range for the ADC.
Applying the above constraints to the design Equations
(1) to (3) gives values for the ratio of RF to RG and for
the value of VIN:
R R
OUT
V
F
G
MAX
MIN
HVMAX
HVMIN
I
/(
)/(
)
=
N
F
G
HVNOM
G
F
V
R
OUT
R R
=+
+
21
1
/ (
(
/
)) (
)/(
(
/
))
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| LT6350HMS8#PBF | 功能描述:IC DIFF CONVERT/ADC DRIVER 8MSOP 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 |
| LT6350HMS8#TRPBF | 功能描述:IC DIFF CONVERT/ADC DRIVER 8MSOP 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 |
| LT6350HMS8PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Low Noise Single-Ended to Differential Converter/ADC Driver |
| LT6350HMS8TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Low Noise Single-Ended to Differential Converter/ADC Driver |
| LT6350IDD#PBF | 功能描述:IC DIFF CONVERT/ADC DRIVER 8-DFN 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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