Datasheet

LMH6618, LMH6619
www.ti.com SNOSAV7E –AUGUST 2007–REVISED OCTOBER 2012
Table 1. Performance Data for the LMH6618 Driving an ADC121S101
Parameter Measured Value
Signal Frequency 100 kHz
Signal Amplitude 4.5V
SINAD 71.5 dB
SNR 71.87 dB
THD −82.4 dB
SFDR 90.97 dB
ENOB 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 65. 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 ADC121S101.
Figure 65. LMH6618 and ADC121S101 Layout
SINGLE TO DIFFERENTIAL ADC DRIVER
Figure 66 shows the LMH6619 used to drive a differential ADC with a single-ended input. The ADC121S625 is a
fully differential 12-bit ADC. Table 2 shows the performance data of the LMH6619 and the ADC121S625.
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