MAX1426_11 Datasheet, PDF (12/16 Pages) Maxim Integrated Products – 10-Bit, 10Msps ADC

10-Bit, 10Msps ADC
heavy loads, as they are specified to deliver only 200µA
for TTL compatibility. If an application needs output
buffering, use 74LS74s or 74ALS541s as required.
Applications Information
Figure 5 shows a typical application circuit containing a
single-ended to differential converter. The internal ref-
erence provides a +2.25V output for level shifting. The
input is buffered and then split to a voltage follower and
inverter. The op amps are followed by a lowpass filter
to remove some of the wideband noise associated with
high-speed op amps. In this application, the amplifier
outputs are directly coupled to the inputs. This configura-
tion can also be modified for AC-coupled applications.
The MAX1426 includes a DC level-shifting circuit internal
to the part, allowing for AC-coupled applications. The
level-shifting circuit is shown in Figure 6.
The circuit in Figure 6 can accept a 1Vp-p maximum
input voltage. With a maximum clock frequency of
10MHz, use 50Ω termination to minimize reflections.
Buffer the digital outputs with a low-cost, high-speed,
INPUT
50Ω
300Ω
300Ω
0.1µF
600Ω
+5V
MAX4108
0.1µF
BAS16
0.1µF
-5V
0.1µF
300Ω
50Ω
600Ω
+5V
2.5k
0.1µF
MAX473A
0.1µF
0.1µF
+5V
2.5k
50Ω
0.1µF
600Ω
+5V
300Ω
0.1µF ^0.1µF
MAX4108
-5V
0.1µF
300Ω
300Ω
MAX4108
50Ω
BAS16
-5V
0.1µF
25Ω
25Ω
600Ω
INP
22pF
MAX1426
CML
INN
22pF
Figure 5. Typical Application Circuit Using the Internal Reference
12 ______________________________________________________________________________________