MAX1426
10-Bit, 10Msps ADC
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octal D-latched flip-flop (74ALS374), or use octal
buffers such as the 74ALS541.
Typical Application Using an
External Reference
Figure 7 shows an application circuit that shuts down
the internal reference, allowing an external reference to
be used for selecting a different common-mode volt-
age. This added flexibility also allows for ratiometric
conversions, as well as for calibration.
Using Transformer Coupling
A small transformer (Figure 8) provides isolation and
AC-coupling to the ADC’s input. Connecting the trans-
former's center tap to CML provides a +2.25VDC level
shift to the input. Transformer coupling reduces the
need for high-speed op amps, thereby reducing cost.
Although a 1:1 transformer is shown, a step-up trans-
former may be selected to reduce the drive require-
ments.
Single-Ended DC-Coupled Input Signal
Figure 9 shows an AC-coupled, single-ended applica-
tion. The MAX4106 quad op amp provides high speed,
high bandwidth, low noise, and low distortion to main-
tain the integrity of the input signal.
