Datasheet

ADC121S625
0.1 PF
10 PF
V
+
33:
V
+
560:
220 pF
560:
-
+
0.1 PF
10 PF
V
+
V
+
560:
560:
33:
560:
220 pF
560:
INPUT
10 PF
-
+
LMH6619
LMH6619
LMH6618, LMH6619
SNOSAV7E –AUGUST 2007–REVISED OCTOBER 2012 www.ti.com
Figure 66. LMH6619 Driving an ADC121S625
Table 2. Performance Data for the LMH6619 Driving an ADC121S625
Parameter Measured Value
Signal Frequency 10 kHz
Signal Amplitude 2.5V
SINAD 67.9 dB
SNR 68.29 dB
THD −78.6 dB
SFDR 75.0 dB
ENOB 11.0 bits
DIFFERENTIAL ADC DRIVER
The circuit in Figure 64 can be used to drive both inputs of a differential ADC. Figure 67 shows the LMH6619
driving an ADC121S705. The ADC121S705 is a fully differential 12-bit ADC. Performance with this circuit is
similar to the circuit in Figure 64.
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