A
參數(shù)資料
型號(hào)： DC1369A-A
廠商： Linear Technology
文件頁(yè)數(shù)： 13/34頁(yè)
文件大小： 0K
描述： BOARD DEMO 125MSPS LTC2261-14
軟件下載： QuikEval II System
設(shè)計(jì)資源： DC1369A Design Files
標(biāo)準(zhǔn)包裝： 1
系列： *
相關(guān)產(chǎn)品： DC890B-ND - BOARD USB DATA COLLECTION
LTC2261-14
LTC2260-14/LTC2259-14
20
226114fc
For more information www.linear.com/LTC2261-14
applicaTions inForMaTion
25
200
0.1F
AIN+
AIN–
12pF
0.1F
VCM
LTC2261-14
226114 F07
–
+
ANALOG
INPUT
HIGH SPEED
DIFFERENTIAL
AMPLIFIER
0.1F
Figure 7. Front-End Circuit Using a High
Speed Differential Amplifier
Reference
The LTC2261-14/LTC2260-14/LTC2259-14 have an inter-
nal 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.
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
226114 F08
LTC2261-14
5
0.8x
DIFF AMP
INTERNAL ADC
LOW REFERENCE
1.25V BANDGAP
REFERENCE
0.625V
RANGE
DETECT
AND
CONTROL
1F
0.1F
Figure 8. Reference Circuit
SENSE
1.25V
EXTERNAL
REFERENCE
1F
VREF
226114 F09
LTC2261-14
Figure 9. Using an External 1.25V Reference
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).
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