參數(shù)資料
型號: LTC2262CUJ-14#PBF
廠商: LINEAR TECHNOLOGY CORP
元件分類: ADC
英文描述: 1-CH 14-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC40
封裝: 6 X 6 MM, LEAD FREE, PLASTIC, QFN-40
文件頁數(shù): 8/28頁
文件大?。?/td> 614K
代理商: LTC2262CUJ-14#PBF
LTC2262-14
16
226214fa
APPLICATIONS INFORMATION
25Ω
200Ω
0.1μF
AIN
+
AIN
12pF
0.1μF
VCM
LTC2262-14
226214 F07
+
ANALOG
INPUT
HIGH SPEED
DIFFERENTIAL
AMPLIFIER
0.1μF
Figure 7. Front-End Circuit Using a High
Speed Differential Amplier
Reference
The LTC2262-14 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 external
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
0.1μF
2.2μF
INTERNAL ADC
HIGH REFERENCE
BUFFER
0.8x
DIFF AMP
INTERNAL ADC
LOW REFERENCE
1.25V BANDGAP
REFERENCE
0.625V
RANGE
DETECT
AND
CONTROL
1μF
0.1μF
LTC2262-14
226214 F08
Figure 8. Reference Circuit
SENSE
1.25V
EXTERNAL
REFERENCE
1μF
VREF
226214 F09
LTC2262-14
Figure 9. Using an External 1.25V Reference
The VREF, REFH and REFL pins should be bypassed as
shown in Figure 8. The 0.1μF 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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