參數(shù)資料
型號(hào)： 8408
廠商： Maxwell Technologies, Inc
英文描述： Quad 8-Bit Multiplying CMOS D/A Converter with Memory
中文描述： 四8位乘法的CMOS的D / A轉(zhuǎn)換器與內(nèi)存
文件頁(yè)數(shù)： 16/20頁(yè)
文件大?。?/td> 472K
代理商： 8408
M
16
All data sheets are subject to change without notice
2002 Maxwell Technologies
All rights reserved.
Quad 8-Bit Multiplying CMOS
D/A Converter with Memory
8408
08.20.02 REV 1
A DIGITALLY PROGRAMMABLE ACTIVE FILTER
A powerful D/A converter application is a programmable active filter design as shown in Figure 11. The design is
based on the state-variable filter topology which offers stable and repeatable filter characteristics. DAC B and DAC D
can be programmed in tandem with a single digital byte load which sets the center frequency of the filter. DAC A sets
the Q of the filter. DAC C sets the gain of the filter transfer function. The unique feature of this design is that varying
the gain of filter does not affect the Q of the filter. Similarly, the reverse is also true. This makes the programmability of
the filter extremely reliable and predictable. Note that low-pass, high-pass, and bandpass outputs are available. This
sophisticated function is achieved in only two IC packages.
The network analyzer photo shown in Figure 12 superimposes five actual bandpass responses ranging from the low-
est frequency of 75 Hz (1 LSB ON) to a full-scale frequency of 19.132 kHz (all bits ON), which is equivalent to a 256 to
1 dynamic range. The frequency is determined by fC = 1/2
π
RC where R is the ladder resistance (RIN) of the 8408,
and C is 1000 pF. Note that from device to device, the resistance RIN varies. Thus some tuning may be necessary.
F
IGURE
12. P
ROGRAMMABLE
A
CTIVE
F
ILTER
B
AND
-P
ASS
F
REQUENCY
R
ESPONSE
All components used are available off-the-shelf. Using low drift thin-film resistors, the 8408 exhibits very stable perfor-
mance over temperature. The wide bandwidth of the OP-470 produces excellent high frequency and high Q response.
In addition, the OP470’s low input offset voltage assures an unusually low dc offset at the filter output.
相關(guān)PDF資料
PDF描述
8408RPFB Quad 8-Bit Multiplying CMOS D/A Converter with Memory
8408RPFE Quad 8-Bit Multiplying CMOS D/A Converter with Memory
8408RPFI Quad 8-Bit Multiplying CMOS D/A Converter with Memory
8408RPFS Quad 8-Bit Multiplying CMOS D/A Converter with Memory
84A3A-C16-J06L 83/84 - 5/8 Square 10-Turn
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
8408 001500 功能描述:多芯電纜 16AWG 2C SHIELD 500ft SPOOL BROWN RoHS:否 制造商:Alpha Wire 導(dǎo)體數(shù)量:3 線規(guī) - 美國(guó)線規(guī)（AWG）:16 絞合:19 x 29 屏蔽:Shielded 長(zhǎng)度:100 ft 電壓額定值:600 V 外殼材料:Polytetrafluoroethylene (PTFE) 絕緣材料:Polytetrafluoroethylene (PTFE) 類型:Communication and Control
8408 001BULK 制造商:Belden Inc 功能描述:2 #16 EPDM BRD CSM BROWN BULK
84080 功能描述:SET SCRPR FLATS 4PC 制造商:apex tool group 系列:* 零件狀態(tài):在售 標(biāo)準(zhǔn)包裝:1
840800.W3ASA 制造商:NORTH SAFETY PRODUCTS 功能描述:DURALITE LIFELINE RETRACTABLE 3.5M
84080100 制造商:Phoenix Contact 功能描述:ALUBOS CASE 82X32X100MM
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