參數(shù)資料
型號(hào)： 8408RPFB
廠商： MAXWELL TECHNOLOGIES
元件分類： DAC
英文描述： Quad 8-Bit Multiplying CMOS D/A Converter with Memory
中文描述： PARALLEL, 8 BITS INPUT LOADING, 0.19 us SETTLING TIME, 8-BIT DAC, DFP28
封裝： RAD PAK, LDFP-28
文件頁(yè)數(shù)： 16/20頁(yè)
文件大?。?/td> 472K
代理商： 8408RPFB
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
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
84A2C-B16-J10L 83/84 - 5/8 Square 10-Turn
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
8408RPFE 制造商:MAXWELL 制造商全稱:Maxwell Technologies 功能描述:Quad 8-Bit Multiplying CMOS D/A Converter with Memory
8408RPFI 制造商:MAXWELL 制造商全稱:Maxwell Technologies 功能描述:Quad 8-Bit Multiplying CMOS D/A Converter with Memory
8408RPFS 制造商:MAXWELL 制造商全稱:Maxwell Technologies 功能描述:Quad 8-Bit Multiplying CMOS D/A Converter with Memory
8408-SRF 制造商:SPC Multicomp 功能描述:STRAIN RELIEF BUSHING KIT; Kit Contents:Installation Tool, Strain Reliefs, Storage Box, Kit Lid Label ;RoHS Compliant: NA
8408-TM 制造商:3M Electronic Products Division 功能描述:St Mm Plate, 8 Port, W/Couplings 8408-Tm 制造商:3M Electronic Products Division 功能描述:PLATE 8 PORT W/ST MULTIMODE CPLN 制造商:3M Electronic Products Division 功能描述:PLATE 8 PORT W/ST MULTIMODE COUPLING
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