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參數(shù)資料
| 型號(hào)： | DAC8426AR |
| 廠(chǎng)商： | ANALOG DEVICES INC |
| 元件分類(lèi)： | DAC |
| 英文描述： | Quad 8-Bit Voltage Out CMOS DAC Complete with Internal 10 V Reference |
| 中文描述： | QUAD, PARALLEL, 8 BITS INPUT LOADING, 3 us SETTLING TIME, 8-BIT DAC, CDIP20 |
| 封裝： | CERDIP-20 |
| 文件頁(yè)數(shù)： | 10/12頁(yè) |
| 文件大?。?/td> | 289K |
| 代理商： | DAC8426AR |
DAC8426
–10–
REV. C
Figure 6. Bipolar Operation
CONNE CT ION AND LAY OUT GUIDE LINE S
Layout and design techniques used in the interface between dig-
ital and analog circuitry require special attention to detail. T he
following considerations should be evaluated prior to PCB layout.
1. Return signal paths through the ground system should be
carefully considered. High-speed digital logic current pulses
traveling on return ground traces generate glitches that can be
radiated to the analog circuits if the ground path layout pro-
duces loop antennas. Ground planes can minimize this situa-
tion. Separate digital and analog grounding areas to minimize
crosstalk. Ideally a single common-point ground should be on
the same PCB board as the DAC8426. T he analog ground re-
turns should take advantage of the appropriate placement of
power supply bypass capacitors.
2. For optimum performance, bypass V
DD
and V
SS
(if using
negative supply voltage) with 0.1
μ
F ceramic disk capacitors
to shunt high-frequency spikes. Also use in parallel 6.8
μ
F to
10
μ
F capacitors to provide a charge reservoir for lower fre-
quency load change requirements. T he reference output
(V
REF
OUT ) should be bypassed with a 10
μ
F tantalum ca-
pacitor to optimize reference output stability during data in-
put changes. T his helps to minimize digital crosstalk.
T able III. Bipolar Output Voltage as a Function of Digital
Input Code
Digital Input
Code
Analog Output
Voltage (= D/256
×
10 V)
255
254
129
128
127
1
0
9.922 V
9.844 V
0.078 V
0.000 V
–0.078 V
–9.922 V
–10.000 V
Full-Scale (FS)
FS-1 LSB
Zero-Scale
Neg Full-Scale
Figure 7. AGND Biasing Scheme Providing Offset Output
Range
3. Power Supply Sequencing—No special requirements exist
with the DAC8426. However, users should be aware that of-
ten the 5 V logic supply may be powered up momentarily
prior to the +15 V analog supply. In this situation, the
DAC8426 ESD input protection diodes will forward bias if
the applied input logic is at logic “1”. No damage will result
to the input since the DAC8426 is designed to withstand mo-
mentary currents of up to 130 mA. T his situation will likely
exist for any DAC or ADC operating from a separate analog
supply.
4. ESD input protection—Attention has been given in the de-
sign of the DAC8426 to ESD sensitivity. Using the human
body model test technique (MIL-ST D 3015.4) the DAC8426
generally will withstand 1500 V ESD transients on all pins.
Handling and testing prior to PCB insertion generally exposes
ICs to the toughest environment they will experience. Once
the IC is soldered in the PCB, it is still important to consider
any traces that connect to PCB edge connectors. T hese traces
should be protected with appropriate devices especially if the
boards will experience field replacement or adjustment. Han-
dling the exposed edge connectors by field maintenance
people in a low humidity environment can produce 20 kV
ESD transients which will be detrimental to almost any inte-
grated IC connected to the edge connector.
相關(guān)PDF資料 |
PDF描述 |
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| DAC8426BR | Quad 8-Bit Voltage Out CMOS DAC Complete with Internal 10 V Reference |
| DAC8426EP | Quad 8-Bit Voltage Out CMOS DAC Complete with Internal 10 V Reference |
| DAC8426ER | Quad 8-Bit Voltage Out CMOS DAC Complete with Internal 10 V Reference |
| DAC8426FP | Quad 8-Bit Voltage Out CMOS DAC Complete with Internal 10 V Reference |
| DAC8426FR | Quad 8-Bit Voltage Out CMOS DAC Complete with Internal 10 V Reference |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DAC8426AR/883 | 制造商:未知廠(chǎng)家 制造商全稱(chēng):未知廠(chǎng)家 功能描述:8-Bit Digital-to-Analog Converter |
| DAC8426AR/883C | 功能描述:數(shù)模轉(zhuǎn)換器- DAC COMPLETE QUAD 8-BIT DAC-LEV.B RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量:1 DAC 輸出端數(shù)量:1 轉(zhuǎn)換速率:2 MSPs 分辨率:16 bit 接口類(lèi)型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時(shí)間:1 us 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| DAC8426BR | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| DAC8426BR/883 | 制造商:未知廠(chǎng)家 制造商全稱(chēng):未知廠(chǎng)家 功能描述:8-Bit Digital-to-Analog Converter |
| DAC8426BR/883C | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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