LTC2223 Linear Technology, LTC2223 Datasheet - Page 19

• Manufacturer Part Number: LTC2223
• Description: (LTC2222 / LTC2223) 105Msps/80Msps ADCs
• Manufacturer: Linear Technology

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APPLICATIO S I FOR ATIO
ANALOG
INPUT
Figure 8. Recommended Front End Circuit for
0.1µF
0.1µF
T1 = MA/COM ETC1-1-13
RESISTORS, CAPACITORS, INDUCTORS
ARE 0402 PACKAGE SIZE
Input Frequencies Above 500MHz
Figure 10. 1.6V Range ADC
T1
12k
12k
U
1.6V
0.8V
25Ω
25Ω
U
SENSE
2.2µF
1µF
V
CM
0.1µF
4.7nH
4.7nH
LTC2222/
LTC2223
W
22223 F10
2.2µF
2pF
V
A
A
CM
IN
IN
+
–
LTC2222/23
U
22223 F08
TIE TO V
TIE TO V
RANGE = 2 • V
CM
0.5V < V
DD
FOR 2V RANGE;
FOR 1V RANGE;
SENSE
SENSE
1.6V
1µF
1µF
Figure 9. Equivalent Reference Circuit
< 1V
FOR
2.2µF
0.1µF
2.2µF
0.1µF
LTC2222/LTC2223
SENSE
REFHA
REFHB
REFLB
REFLA
V
CM
LTC2222/LTC2223
CONTROL
4Ω
DETECT
RANGE
AND
1.6V BANDGAP
DIFF AMP
REFERENCE
INTERNAL ADC
HIGH REFERENCE
INTERNAL ADC
LOW REFERENCE
1V
BUFFER
0.5V
19
22223fa
22223 F09