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參數(shù)資料
型號(hào)： DC1370A-J
廠商： Linear Technology
文件頁(yè)數(shù)： 13/34頁(yè)
文件大?。?/td> 0K
描述： BOARD DEMO 65MSPS LTC2258-12
軟件下載： QuikEval II System
設(shè)計(jì)資源： DC1370A Design Files
標(biāo)準(zhǔn)包裝： 1
系列： *
相關(guān)產(chǎn)品： DC718C-ND - DEMO QUIKEVAL-II DATA
LTC2258-12
LTC2257-12/LTC2256-12
20
225812fd
For more information www.linear.com/LTC2258-12
applicaTions inForMaTion
25
200
0.1F
AIN+
AIN–
12pF
0.1F
VCM
LTC2258-12
225812 F07
–
+
ANALOG
INPUT
HIGH SPEED
DIFFERENTIAL
AMPLIFIER
0.1F
Figure 7. Front-End Circuit Using a High Speed
Differential Amplifier
Amplifier Circuits
Figure 7 shows the analog input being driven by a high
speed differential amplifier. The output of the amplifier is
AC coupled to the A/D so the amplifier’s output common
mode voltage can be optimally set to minimize distortion.
At very high frequencies an RF gain block will often have
lower distortion than a differential amplifier. If the gain
blockissingle-ended,thenatransformercircuit(Figures 4
to 6) should convert the signal to differential before driv-
ing the A/D.
Reference
The LTC2258-12/2257-12/2256-12 has an internal 1.25V
voltage reference. For a 2V input range using the internal
reference, connect SENSE to VDD. For a 1V input range
using the internal reference, connect SENSE to ground.
For a 2V input range with an external reference, apply a
1.25V reference voltage to SENSE (Figure 9.)
The input range can be adjusted by applying a voltage to
SENSE that is between 0.625V and 1.30V. The input range
will then be 1.6 VSENSE.
The VREF, REFH and REFL pins should be bypassed as
shown in Figure 8. The 0.1F capacitor between REFH
and REFL should be as close to the pins as possible (not
on the back side of the circuit board).
VREF
REFH
SENSE
TIE TO VDD FOR 2V RANGE;
TIE TO GND FOR 1V RANGE;
RANGE = 1.6 VSENSE FOR
0.65V < VSENSE < 1.300V
1.25V
REFL
0.1F
2.2F
INTERNAL ADC
HIGH REFERENCE
BUFFER
5
0.8x
DIFF AMP
INTERNAL ADC
LOW REFERENCE
1.25V BANDGAP
REFERENCE
0.625V
RANGE
DETECT
AND
CONTROL
1F
0.1F
225812 F08
LTC2258-12
Figure 8. Reference Circuit
SENSE
1.25V
EXTERNAL
REFERENCE
1F
VREF
225812 F09
LTC2258-12
Figure 9. Using an External 1.25V Reference
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DC1370A-K 功能描述:BOARD DEMO 40MSPS LTC2257-12 RoHS:是 類別:未定義的類別 >> 其它 系列:* 標(biāo)準(zhǔn)包裝:1 系列:* 其它名稱:MS305720A
DC1370A-L 功能描述:BOARD DEMO 25MSPS LTC2256-12 RoHS:是 類別:未定義的類別 >> 其它 系列:* 標(biāo)準(zhǔn)包裝:1 系列:* 其它名稱:MS305720A
DC1370A-M 制造商:Linear Technology 功能描述:14BIT ADC Eval Brd, Rq. DC718 制造商:Linear Technology 功能描述:14BIT ADC Eval Brd, Rq. DC718; Silicon Manufacturer:Linear Technology; Silicon Core Number:LTC2262-14; Kit Application Type:Data Converter; Application Sub Type:ADC; Kit Contents:Board, Guide; Features:Also works with requred DC718
DC1370A-N 制造商:Linear Technology 功能描述:12BIT ADC Eval Brd, Rq. DC718 制造商:Linear Technology 功能描述:12BIT ADC Eval Brd, Rq. DC718; Silicon Manufacturer:Linear Technology; Silicon Core Number:LTC2262-12; Kit Application Type:Data Converter; Application Sub Type:ADC; Kit Contents:Board, Guide; Features:Also works with requred DC718
DC1371A 功能描述:BOARD USB DATA ACQUISITION HS RoHS:是 類別:未定義的類別 >> 其它 系列:* 標(biāo)準(zhǔn)包裝:1 系列:* 其它名稱:MS305720A
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