LMH6618MK NSC [National Semiconductor], LMH6618MK Datasheet - Page 19

• Manufacturer Part Number: LMH6618MK
• Description: 130 MHz, 1.25 mA Rail-to-Rail Input and Output Operational Amplifier with Shutdown
• Manufacturer: NSC [National Semiconductor]

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
Parameter
Signal Frequency
Signal Amplitude
SINAD
SNR
THD
SFDR
ENOB
TABLE 1. Performance Data for the LMH6618 Driving an ADC121S101
FIGURE 3. LMH6618 Driving an ADC121S101
19
Measured Value
100 kHz
4.5V
71.5 dB
71.87 dB
−82.4 dB
90.97 dB
11.6 bits
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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