MAX12553 Datasheet, PDF (22/28 Pages) Maxim Integrated Products – 14-Bit, 65Msps, 3.3V ADC

14-Bit, 65Msps, 3.3V ADC
0.1µF
V_IN
1
6
T1
N.C. ²
5
3
4
MINICIRCUITS
TT1-6 OR T1-1T
24.9Ω
12pF
2.2µF
24.9Ω
12pF
INP
MAX12553
COM
INN
Figure 10. Transformer-Coupled Input Drive for Input
Frequencies Up to Nyquist
MAX4108
V_IN
0.1µF
100Ω
24.9Ω
5.6pF
100Ω
24.9Ω
2.2µF
5.6pF
INP
MAX12553
COM
INN
Figure 12. Single-Ended, AC-Coupled Input Drive
0Ω*
0.1µF
V_IN
1
6
T1
N.C. ²
5
3
4
MINICIRCUITS
ADT1-1WT
1
6
75Ω
T2
0.5%
N.C. ²
5 _N.C.
75Ω
0.5%
3
4
MINICIRCUITS
ADT1-1WT
5.6pF
110Ω
0.1%
110Ω
2.2µF
0.1%
0Ω*
5.6pF
*0Ω RESISTORS CAN BE REPLACED WITH LOW-VALUE
RESISTORS TO LIMIT THE BANDWIDTH.
INP
MAX12553
COM
INN
Figure 11. Transformer-Coupled Input Drive for Input Frequencies Beyond Nyquist
the common-mode rejection, allowing high-frequency
signals beyond the Nyquist frequency. The two sets of
termination resistors provide an equivalent 75Ω termi-
nation to the signal source. The second set of termina-
tion resistors connects to COM, providing the correct
input common-mode voltage. Two 0Ω resistors in series
with the analog inputs allow high IF input frequencies.
These 0Ω resistors can be replaced with low-value
resistors to limit the input bandwidth.
Single-Ended, AC-Coupled Input Signal
Figure 12 shows an AC-coupled, single-ended input
application. The MAX4108 provides high speed, high
bandwidth, low noise, and low distortion to maintain the
input signal integrity.
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