LTC2264-12 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC2264-12' PDF : 32 Pages View PDF
LTC2265-12/
LTC2264-12/LTC2263-12
APPLICATIONS INFORMATION
Amplifier Circuits
Figure 7 shows the analog input being driven by a high speed
differential amplifier. The output of the amplifier is AC-
coupled to the A/D so the amplifier’s output common mode
voltage can be optimally set to minimize distortion.
0.1μF
ANALOG
INPUT
T1
0.1μF
50Ω
VCM
0.1μF
T2
25Ω 0.1μF
AIN+
LTC2265-12
4.7pF
25Ω
AIN–
T1: MA/COM MABA-007159-000000
T2: MA/COM MABAES0060
RESISTORS, CAPACITORS ARE 0402 PACKAGE SIZE
226512 F04
Figure 4. Recommended Front-End Circuit for Input
Frequencies from 70MHz to 170MHz
At very high frequencies an RF gain block will often have
lower distortion than a differential amplifier. If the gain
block is single-ended, then a transformer circuit (Figures
4 to 6) should convert the signal to differential before
driving the A/D.
ANALOG
INPUT
0.1μF
T1
0.1μF
50Ω
2.7nH
25Ω
0.1μF
25Ω
2.7nH
VCM
0.1μF
AIN+
LTC2265-12
AIN–
T1: MA/COM ETC1-1-13
RESISTORS, CAPACITORS
ARE 0402 PACKAGE SIZE
226512 F06
Figure 6. Recommended Front-End Circuit for Input
Frequencies Above 300MHz
0.1μF
ANALOG
INPUT
T1
0.1μF
50Ω
VCM
0.1μF
T2
25Ω 0.1μF
AIN+
LTC2265-12
1.8pF
25Ω
AIN–
T1: MA/COM MABA-007159-000000
T2: COILCRAFT WBC1-1LB
RESISTORS, CAPACITORS ARE 0402 PACKAGE SIZE
226512 F05
Figure 5. Recommended Front-End Circuit for Input
Frequencies from 170MHz to 300MHz
ANALOG
INPUT
HIGH SPEED
DIFFERENTIAL
AMPLIFIER
0.1μF
++
200Ω 200Ω
25Ω
– – 0.1μF
25Ω
VCM
0.1μF
AIN+
LTC2265-12
12pF
AIN–
226512 F07
Figure 7. Front-End Circuit Using a High Speed
Differential Amplifier
20
22654312f
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