LTC2262-14 Linear Dimensions Semiconductor, LTC2262-14 Datasheet - Page 16

• Manufacturer Part Number: LTC2262-14
• Description: 150Msps Ultralow Power 1.8V ADC
• Manufacturer: Linear Dimensions Semiconductor

www.datasheet4u.com
APPLICATIONS INFORMATION
LTC2262-14
16
Reference
The LTC2262-14 has an internal 1.25V voltage reference.
For a 2V input range using the internal reference, connect
SENSE to V
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 • V
ANALOG
INPUT
Figure 7. Front-End Circuit Using a High
Speed Differential Amplifi er
DIFFERENTIAL
HIGH SPEED
+
–
AMPLIFIER
DD
+
–
. For a 1V input range using the external
0.1μF
0.1μF
SENSE
.
200Ω
200Ω
25Ω
25Ω
0.1μF
12pF
12pF
V
A
A
CM
IN
IN
+
–
LTC2262-14
226214 F07
The V
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).
TIE TO GND FOR 1V RANGE;
TIE TO V
RANGE = 1.6 • V
0.65V < V
REF
DD
2.2μF
FOR 2V RANGE;
Figure 9. Using an External 1.25V Reference
SENSE
0.1μF
0.1μF
, REFH and REFL pins should be bypassed as
1.25V
SENSE
< 1.300V
REFERENCE
EXTERNAL
FOR
Figure 8. Reference Circuit
1.25V
0.1μF
1μF
SENSE
REFH
V
REFL
REF
LTC2262-14
SENSE
1μF
1μF
CONTROL
V
5Ω
DETECT
RANGE
REF
AND
LTC2262-14
1.25V BANDGAP
DIFF AMP
REFERENCE
INTERNAL ADC
HIGH REFERENCE
0.8x
INTERNAL ADC
LOW REFERENCE
226214 F09
0.625V
BUFFER
226214p
226214 F08