MAX1425_11 Datasheet, PDF (14/16 Pages) Maxim Integrated Products – 10-Bit, 20Msps ADC Separate Digital Supply Input for 3V Logic Compatibility

10-Bit, 20Msps ADC
IN1
R2
100Ω
R4
25Ω
C3
22pF
1 T1 6
N.C. ₂
5
R3
100Ω ₃
4
MINICIRCUITS
KKB1
0.1μF
R5
25Ω
C9
22pF
MAX1425
CML
INP
V_IN
±V
50Ω MAX4108
±2V ^0.1μF 50Ω
100Ω
INP
22pF
MAX1425
100Ω
INN
0.1μF
Figure 9. Single-Ended AC-Coupled Input Signal
Figure 8. Using a Transformer for AC-Coupling
Bypassing and Board Layout
The MAX1425 requires high-speed board layout design
techniques. Locate all bypass capacitors as close to
the device as possible, using surface-mount devices
for minimum inductance. Bypass all analog voltages
(AV_DD, REFIN, REFP, REFN, and CML) to AGND.
Bypass the digital supply (DV_DD) to DGND. Multilayer
boards with separated ground and power planes pro-
duce the highest level of signal integrity. Route high-
speed digital signal traces away from sensitive analog
traces. Matching impedance, especially for the input
clock generator, may reduce reflections, thus providing
less jitter in the system. For optimum results, use low-
distortion complementary components such as the
MAX4108.
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