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參數(shù)資料
| 型號： | AD840JN |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運(yùn)動控制電子 |
| 英文描述： | Wideband, Fast Settling Op Amp |
| 中文描述： | OP-AMP, 1500 uV OFFSET-MAX, 400 MHz BAND WIDTH, PDIP14 |
| 封裝： | PLASTIC, DIP-14 |
| 文件頁數(shù)： | 17/20頁 |
| 文件大?。?/td> | 463K |
| 代理商： | AD840JN |
REV. C
AD8400/AD8402/AD8403
–17–
ACTIVE FILTER
One of the standard circuits used to generate a low-pass, high-
pass, or band-pass filter is the state variable active filter. The
digital potentiometer allows full programmability of the frequency,
gain and Q of the filter outputs. Figure 10 shows the filter circuit
using a 2.5 V virtual ground, which allows a
±
2.5 V
P
input and
output swing. RDAC2 and 3 set the LP, HP, and BP cutoff and
center frequencies, respectively. These variable resistors should
be programmed with the same data (as with ganged potentiom-
eters) to maintain the best circuit Q. Figure 11 shows the measured
filter response at the band-pass output as a function of the RDAC2
and RDAC3 settings which produce a range of center frequencies
from 2 kHz to 20 kHz. The filter gain response at the band-pass
output is shown in Figure 12. At a center frequency of 2 kHz, the
gain is adjusted over a
–
20 dB to +20 dB range determined by
RDAC1. Circuit Q is adjusted by RDAC4. For more detailed
reading on the state variable active filter, see Analog Devices
’
application note, AN-318.
A1
RDAC1
V
IN
B
A2
A3
A4
RDAC4
B
10k
10k
OP279 2
RDAC2
RDAC3
B
B
0.01 F
0.01 F
BAND-
PASS
HIGH-
PASS
LOW-
PASS
Figure 10. Programmable State Variable Active Filter
FREQUENCY
–
Hz
40
20
–
8020
100k
100
1k
10k
0
–
20
–
40
–
60
200k
A
–
–
0.16
20.0000 k
A
Figure 11. Programmed Center Frequency Band-Pass
Response
FREQUENCY
–
Hz
40
20
–
8020
100k
100
1k
10k
0
–
20
–
40
–
60
200k
A
–
–
19.01
2.00000 k
A
Figure 12. Programmed Amplitude Band-Pass Response
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PDF描述 |
|---|---|
| AD840JQ | Wideband, Fast Settling Op Amp |
| AD840KN | Wideband, Fast Settling Op Amp |
| AD840KQ | Wideband, Fast Settling Op Amp |
| AD842* | Wideband. High Output Current. Fast Settling Op Amp |
| AD842SE | Voltage-Feedback Operational Amplifier |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD840JQ | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| AD840KN | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Analog Devices 功能描述: |
| AD840KQ | 制造商:AD 制造商全稱:Analog Devices 功能描述:Wideband, Fast Settling Op Amp |
| AD840S | 制造商: 功能描述: 制造商:undefined 功能描述: |
| AD840SE/883B | 制造商:Rochester Electronics LLC 功能描述:PRECISION HIGH SPEED AMP - Bulk |
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