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LTC2262-14
16
226214fc
For more information www.linear.com/LTC2262-14
APPLICATIONS INFORMATION
25
200
0.1F
AIN+
AIN–
12pF
0.1F
VCM
LTC2262-14
226214 F07
–
+
ANALOG
INPUT
HIGH SPEED
DIFFERENTIAL
AMPLIFIER
0.1F
Figure 7. Front-End Circuit Using a High
Speed Differential Amplifier
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 internal
reference, connect SENSE to ground. For a 2V input range
withanexternalreference,applya1.25Vreferencevoltage
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
5
0.8x
DIFF AMP
INTERNAL ADC
LOW REFERENCE
1.25V BANDGAP
REFERENCE
0.625V
RANGE
DETECT
AND
CONTROL
1F
0.1F
LTC2262-14
226214 F08
Figure 8. Reference Circuit
SENSE
1.25V
EXTERNAL
REFERENCE
1F
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 0.1F capacitor between REFH and
REFL should be as close to the pins as possible (not on
the back side of the circuit board).
发布紧急采购，3分钟左右您将得到回复。
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