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參數資料
| 型號： | AD8403 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | 通用總線功能 |
| 英文描述： | 4-Channel Digital Potentiometers(???é??é????°?-???μ?????¨) |
| 中文描述： | 4通道數字電位器（四通道數字電位器） |
| 文件頁數： | 16/20頁 |
| 文件大小： | 508K |
| 代理商： | AD8403 |
AD8400/AD8402/AD8403
–16–
REV. B
ACTIVE FILTER
One of the standard circuits used to generate a low-pass, high-
pass or bandpass filter is the state variable active filter. The digi-
tal potentiometer allows full programmability of the frequency,
gain and Q of the filter outputs. Figure 44 shows the filter cir-
cuit 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 po-
tentiometers) to maintain the best circuit Q. Figure 45 shows
the measured filter response at the bandpass output as a func-
tion of the RDAC2 and RDAC3 settings which produce a range
of center frequencies from 2 kHz to 20 kHz. The filter gain re-
sponse at the bandpass output is shown in Figure 46. At a cen-
ter 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
A2
A3
A4
~
10k
RDAC4
10k
RDAC2
RDAC3
0.01μF
2.5V
0.01μF
RDAC1
V
IN
OP279
×
2
HIGH-
PASS
LOW-
PASS
BAND-
PASS
±
B
B
B
B
Figure 44. 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
Figure 45. Programmed Center Frequency Bandpass
Response
FREQUENCY – Hz
40
20
–80
20
100k
100
1k
10k
0
–20
–40
–60
200k
A
–19.01
2.00000 k
Figure 46. Programmed Amplitude Bandpass Response
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|---|---|
| AD84030001RR | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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| AD8403AN1 | 制造商:Rochester Electronics LLC 功能描述:QUAD 8-BIT POTENTIOMETER 1 OHM - Bulk |
| AD8403AN10 | 功能描述:IC POT DIG QUAD 10K 8BIT 24DIP RoHS:否 類別:集成電路 (IC) >> 數據采集 - 數字電位器 系列:- 標準包裝:3,000 系列:DPP 接片:32 電阻（歐姆）:10k 電路數:1 溫度系數:標準值 300 ppm/°C 存儲器類型:非易失 接口:3 線串行（芯片選擇，遞增，增/減） 電源電壓:2.5 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-WFDFN 裸露焊盤 供應商設備封裝:8-TDFN（2x3） 包裝:帶卷 (TR) |
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