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ADA4807-2ACPZ-R2 数据表(PDF) 28 Page - Analog Devices

部件名 ADA4807-2ACPZ-R2
功能描述  3.1 nV/?숰z, 1 mA, 180 MHz, Rail-to-Rail Input/Output Amplifiers
PDF  33 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

ADA4807-2ACPZ-R2 数据表(HTML) 28 Page - Analog Devices

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ADA4807-1/ADA4807-2/ADA4807-4
Data Sheet
Rev. B | Page 28 of 33
AD7980
REF
IN+
IN–
GND
ADR4540
+
–
AD8603
+
–
5V
5V
C4
0.1µF
C3
10µF
C2
0.1µF
C1
2.7µF
R10
22Ω
R11
49.9Ω
5V
5V
LP MODE
VIN
+
–
ADA4807-1/
ADA4807-2/
ADA4807-4
ADA4807-1/
ADA4807-2/
ADA4807-4
Figure 73. Dual Power Mode ADC Driver
ADC DRIVING
The ADA4807-1/ADA4807-2/ADA4807-4 can be used in ADC
driving applications. Figure 74 is a simplified schematic of the
ADA4807-1/ADA4807-2/ADA4807-4 driving an 18-bit differential
ADC, the AD7982, in a fully differential signal chain. This configu-
ration results in an effective number of bits (ENOB) of 15.7; results
are shown in Figure 75.
ADA4807-1/
ADA4807-2/
ADA4807-4
ADA4807-1/
ADA4807-2/
ADA4807-4
VIN+
20Ω
2.7nF
2.7nF
20Ω
VIN–
ADC
IN–
IN+
Figure 74. Schematic for Driving the AD7982, +VS = +7 V, −VS = −1 V
0
–20
–40
–60
–80
–100
–120
–140
–160
–180
20
18
16
14
12
10
8
6
4
2
0
FREQUENCY (kHz)
fs = 200kSPS
fIN = 1kHz
SNR = 96.6dB
THD = –111.5dB
SFDR = –112.3dB
SINAD = 96.5dB
Figure 75. FFT for Driving a Differential Converter, −0.5 dBFS
Figure 76 shows the ADA4807-1/ADA4807-2/ADA4807-4
configured to convert a single-ended to differential signal and
drive an 18-bit ADC. This configuration results in an ENOB of
15.3. The FFT is shown in Figure 77.
ADC
REF
2
IN–
IN+
20Ω
2.7nF
2.7nF
20Ω
1kΩ
1kΩ
VIN
ADA4807-1/
ADA4807-2/
ADA4807-4
ADA4807-1/
ADA4807-2/
ADA4807-4
Figure 76. Schematic for Driving the AD7982 Differential Converter from a
Single-Ended Input Signal, +VS = +7 V, −VS = −1 V
0
–20
–40
–60
–80
–100
–120
–140
–160
–180
20
18
16
14
12
10
8
6
4
2
0
FREQUENCY (kHz)
fs = 200kSPS
fIN = 1kHz
SNR = 94.5dB
THD = –110.3dB
SFDR = –111.1dB
SINAD = 94.4dB
Figure 77. FFT for Driving a Single-Ended Input Signal into a Differential
Converter



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