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參數(shù)資料
| 型號(hào)： | DAC8408GPZ |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | DAC |
| 英文描述： | QUAD, PARALLEL, 8 BITS INPUT LOADING, 0.19 us SETTLING TIME, 8-BIT DAC, PDIP28 |
| 封裝： | PLASTIC, DIP-28 |
| 文件頁(yè)數(shù)： | 5/16頁(yè) |
| 文件大?。?/td> | 219K |
| 代理商： | DAC8408GPZ |
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DAC8408
–13–
REV. A
Figure 9. A Digitally Programmable Universal Active Filter
Figure 10. Programmable Active Filter Band-Pass
Frequency Response
All components used are available off-the-shelf. Using low drift
thin-film resistors, the DAC8408 exhibits very stable perfor-
mance over temperature. The wide bandwidth of the OP-470
produces excellent high frequency and high Q response. In addi-
tion, the OP470’s low input offset voltage assures an unusually
low dc offset at the filter output.
A DIGITALLY PROGRAMMABLE ACTIVE FILTER
A powerful D/A converter application is a programmable active
filter design as shown in Figure 9. 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 fre-
quency 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 pro-
grammability of the filter extremely reliable and predictable.
Note that low-pass, high-pass, and bandpass outputs are avail-
able. This sophisticated function is achieved in only two IC
packages.
The network analyzer photo shown in Figure 10 superimposes
five actual bandpass responses ranging from the lowest fre-
quency 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 = 1/2πRC where R is
the ladder resistance (RIN) of the DAC8408, and C is 1000 pF.
Note that from device to device, the resistance RIN varies. Thus
some tuning may be necessary.
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相關(guān)代理商/技術(shù)參數(shù) |
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| DAC8408HP | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Analog Devices 功能描述: |
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| DAC8411EVM | 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC 開(kāi)發(fā)工具 DAC8411 Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Demonstration Kits 類型:ADC 工具用于評(píng)估:ADS130E08 接口類型:SPI 工作電源電壓:- 6 V to + 6 V |
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