Texas Instruments Single to Differential ADC Driver PCB for LMH6612 and LMH6619 (SOIC package, unstuffed) 551600074-001/ 551600074-001/NOPB 데이터 시트
제품 코드
551600074-001/NOPB
LMH6611
ADC121S101
0.1
P
F
10
P
F
0.1
P
F
10
P
F
0.1
P
F
V
+
0.01
P
F
R6
14.3 k
:
0.1
P
F
1
P
F
GND
5V
R
5
1.24 k
:
C
2
1 nF
C
5
150 pF
R
2
549
:
V
+
-
+
R
L
22
:
C
L
390 pF
R
1
549
:
IN
1
P
F
V
+
R
7
14.3 k
:
5.6
P
F
U1
SNOSB00K – NOVEMBER 2007 – REVISED OCTOBER 2013
Figure 69. Single to Single ADC Driver
Table 1. Performance of the LMH6611 Combined with the ADC121S101
Amplifier
SINAD
SNR
THD
SFDR
ENOB
Notes
Output/ADC Input
(dB)
(dB)
(dB)
(dBc)
4
70.2
71.6
−75.7
77.6
11.4
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
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
. 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:
•
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.
Copyright © 2007–2013, Texas Instruments Incorporated
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