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參數資料
| 型號： | AD8651 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 50 MHz, Precision, Low Distortion, Low Noise CMOS Amplifiers |
| 中文描述： | 50兆赫，精密，低失真，低噪聲CMOS運算放大器 |
| 文件頁數： | 17/20頁 |
| 文件大小： | 558K |
| 代理商： | AD8651 |
AD8651/AD8652
Driving a 16-Bit ADC
The AD8651 is an excellent choice for driving high speed, high
precision ADCs. The driver amplifier for this type of
application needs to have low THD + N as well as quick settling
solution. The AD8651 drives the AD7685, a 250 kSPS, 16-bit data converter.
1
Rev. B | Page 17 of 20
1
μ
F
+
AD8651
–
V
V–
3
2
U1
IN
2.7nF
33
V
CC
5V
1k
10k
10k
1k
AD7685
V
IN
0V – 5V
f
IN
= 45kHz
0
The AD8651 is configured in an inverting gain of 1 with a 5 V
single supply. Input of 45 kHz is applied, and the ADC samples
at 250 kSPS. The results of this solution are listed in Table 6.
The advantage of this circuit is that the amplifier and ADC can
be powered with the same power supply. For the case of a
noninverting gain of 1, the input common-mode voltage
encompasses both supplies.
Figure 60. AD8651 Driving a 16-Bit ADC
Table 6. Data Acquisition Solution of Figure 60
Parameter
THD + N
SFDR
2
nd
Harmonics
3
rd
Harmonics
Reading (dB)
105.2
106.6
107.7
113.6
f
SAMPLE
= 250kSPS
f
INPUT RANGE = 0 TO 5V
0
FREQUENCY (kHz)
A
0
–160
–100
–120
–140
–80
–60
–40
–20
0
10
20
30 40
50
60
70
80
90
100 110 120
1
For more information about the AD7685 data converter, go to
http://www.analog.com/Analog_Root/productPage/productHome/0%2C21
21%2CAD7685%2C00.html
Figure 59. Frequency Response of AD8651 Driving a 16-Bit ADC
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