LTC2262-12
14
226212fc
For more information www.linear.com/LTC2262-12
pin, which is nominally VDD/2. For the 2V input range, the
inputs should swing from VCM– 0.5V to VCM + 0.5V. There
should be 180° phase difference between the inputs.
INPUT DRIVE CIRCUITS
Input filtering
If possible, there should be an RC lowpass filter right at
the analog inputs. This lowpass filter isolates the drive
circuitry from the A/D sample-and-hold switching, and
alsolimitswidebandnoisefromthedrivecircuitry.Figure 3
shows an example of an input RC filter. The RC component
values should be chosen based on the application’s input
frequency.
25
50
0.1F
AIN+
AIN–
12pF
0.1F
VCM
LTC2262-12
ANALOG
INPUT
0.1F
T1
1:1
T1: MA/COM MABAES0060
RESISTORS, CAPACITORS
ARE 0402 PACKAGE SIZE
226212 F03
Figure 3. Analog Input Circuit Using a Transformer.
Recommended for Input Frequencies from 5MHz to 70MHz
APPLICATIONS INFORMATION
Figure 5. Recommended Front-End Circuit for Input
Frequencies from 170MHz to 270MHz
Figure 6. Recommended Front-End Circuit for Input
Frequencies Above 270MHz
Transformer Coupled Circuits
Figure 3 shows the analog input being driven by an RF
transformer with a center-tapped secondary. The center
tap is biased with VCM, setting the A/D input at its optimal
DC level. At higher input frequencies a transmission line
balun transformer (Figures 4 to 6) has better balance,
resulting in lower A/D distortion.
Figure 4. Recommended Front-End Circuit for Input
Frequencies from 70MHz to 170MHz
25
50
0.1F
AIN+
AIN–
1.8pF
0.1F
VCM
ANALOG
INPUT
0.1F
T1
T2
T1: MA/COM MABA-007159-000000
T2: COILCRAFT WBC1-1LB
RESISTORS, CAPACITORS ARE 0402 PACKAGE SIZE
226212 F05
LTC2262-12
25
50
0.1F
AIN+
AIN–
4.7pF
0.1F
VCM
ANALOG
INPUT
0.1F
T1
T2
T1: MA/COM MABA-007159-000000
T2: MA/COM MABAES0060
RESISTORS, CAPACITORS ARE 0402 PACKAGE SIZE
226212 F04
LTC2262-12
25
50
0.1F
2.7nH
AIN+
AIN–
0.1F
VCM
ANALOG
INPUT
0.1F
T1
T1: MA/COM ETC1-1-13
RESISTORS, CAPACITORS
ARE 0402 PACKAGE SIZE
226212 F06
LTC2262-12