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參數(shù)資料
| 型號(hào)： | AD8002 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Dual 600 MHz, 50 mW Current Feedback Amplifier(600MHz,50mW雙電流反饋放大器) |
| 中文描述： | 雙600兆赫，50毫瓦電流反饋放大器（頻率600MHz，50mW的雙電流反饋放大器） |
| 文件頁(yè)數(shù)： | 12/16頁(yè) |
| 文件大小： | 507K |
| 代理商： | AD8002 |
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AD8002
REV. B
–12–
Driving A-to-D Converters
T he AD8002 is well suited for driving high speed analog-to-
digital converters such as the AD9058. T he AD9058 is a dual
8-bit 50 MSPS ADC. In the circuit below the AD8002 is shown
driving the inputs of the AD9058 which are configured for 0 V
to +2 V ranges. Bipolar input signals are buffered, amplified
(–2
×
), and offset (by +1.0 V) into the proper input range of the
ADC. Using the AD9058’s internal +2 V reference connected
to both ADCs as shown in Figure 46 reduces the number of
external components required to create a complete data
acquisition system. T he 20
resistors in series with ADC in-
puts are used to help the AD8002s drive the 10 pF ADC input
capacitance. T he AD8002 only adds 100 mW to the power con-
sumption while not limiting the performance of the circuit.
0.1
μ
F
+V
S
–V
S
20
50
1k
18
17
16
15
14
13
12
11
–V
REF A
–V
REF B
10pF
CLOCK
5, 9, 22,
24, 37, 41
4,19, 21 25, 27, 42
0.1
μ
F
38
8
6
+V
INT
2
3
+V
REF A
A
IN A
549
274
ANALOG
IN A
±
0.5V
1.1k
AD707
43
+V
REF B
20k
0.1
μ
F
–2V
1.1k
20k
549
ANALOG
IN B
±
0.5V
274
20
0.1
μ
F
40
COMP
1
A
IN B
ENCODE A
ENCODE B
10
36
ENCODE
74ACT04
0.1
μ
F
+5V
28
29
30
31
32
33
34
35
RZ1
RZ2
D
0A
(LSB)
D
7A
(MSB)
D
0B
(LSB)
D
7B
(MSB)
7, 20,
26, 39
–5V
1N4001
AD9058
(J-LEAD)
RZ1, RZ2 = 2,000
SIP (8-PKG)
7
7
8
8
1/2
AD8002
1/2
AD8002
50
50
Figure 46. AD8002 Driving a Dual A-to-D Converter
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