LMH6618 Datasheet, PDF (19/26 Pages) National Semiconductor (TI) – 130 MHz, 1.25 mA Rail-to-Rail Input and Output Operational Amplifier with Shutdown

FIGURE 3. LMH6618 Driving an ADC121S101
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TABLE 1. Performance Data for the LMH6618 Driving an ADC121S101
Parameter
Signal Frequency
Signal Amplitude
SINAD
SNR
THD
SFDR
ENOB
Measured Value
100 kHz
4.5V
71.5 dB
71.87 dB
−82.4 dB
90.97 dB
11.6 bits
When the op amp and the ADC are using the same supply, it
is important that both devices are well bypassed. A 0.1 µF
ceramic capacitor and a 10 µF tantalum capacitor should be
located as close as possible to each supply pin. A sample
layout is shown in Figure 4. The 0.1 µF capacitors (C13 and
C6) and the 10 µF capacitors (C11 and C5) are located very
close to the supply pins of the LMH6618 and the AD-
C121S101.
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