LMH6611 Datasheet, PDF (25/42 Pages) Intersil Corporation – PowerWise® Single Supply 345 MHz Rail-to-Rail Output Amplifiers

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LMH6611, LMH6612
SNOSB00K – NOVEMBER 2007 – REVISED OCTOBER 2013
1 PF
R₁
549:
IN
R₅
1.24 k:
5V
1 PF
GND
V⁺
0.1 PF
0.01 PF
R6
14.3 k:
C₂
1 nF
R₇
14.3 k:
5.6 PF
0.1 PF
R₂
549:
C₅
150 pF
V⁺
0.1 PF
-
LMH6611
+
U1
10 PF
R_L
22:
C_L
390 pF
V⁺
0.1 PF 10 PF
ADC121S101
Figure 69. Single to Single ADC Driver
Table 1. Performance of the LMH6611 Combined with the ADC121S101
Amplifier
Output/ADC Input
4
SINAD
(dB)
70.2
SNR
(dB)
71.6
THD
(dB)
−75.7
SFDR
(dBc)
77.6
ENOB
11.4
Notes
ADC121S101 @ f = 200 kHz
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 70. 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 LMH6611 and the ADC121S101.
The following are recommendations for the design of PCB layout in order to obtain the optimum high frequency
performance:
• Place ADC and amplifier as close together as possible.
• Put the supply bypassing capacitors as close as possible to the device (<1”).
• Utilize surface mount instead of through-hole components and ground and power planes.
• Keep the traces short where possible.
• Use terminated transmission lines for long traces.
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