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5962-9201601MEA 参数 Datasheet PDF下载

5962-9201601MEA图片预览
型号: 5962-9201601MEA
PDF下载: 下载PDF文件 查看货源
内容描述: [16-Bit Current-Steering DAC with Voltage Reference]
分类和应用: 信息通信管理转换器
文件页数/大小: 8 页 / 308 K
品牌: ADI [ ADI ]
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AD766  
system where only a single positive and a single negative supply  
are available. In this case, the positive logic and positive analog  
supplies may both be connected to the single positive supply.  
The negative logic and negative analog supplies may both be  
connected to the single negative supply. Performance would  
benefit from a measure of isolation between the supplies intro-  
duced by using simple low-pass filters in the individual power  
supply leads.  
in signal processing applications, the DAC is tested at two  
output frequencies and at three signal levels over the full oper-  
ating temperature ranges.  
A block diagram of the test setup is shown in Figure 8. In this  
test setup, a digital data stream, representing a 0 dB, –20 dB or  
–60 dB sine wave is sent to the device under test. The frequen-  
cies used are 1037 Hz and 49.07 kHz. Input data is latched into  
the AD766 at 500 kSPS. The AD766 under test produces an  
analog output signal using the on-board op amp for 1 kHz and  
an external op amp for 50 kHz.  
The automatic test equipment digitizes the output test wave-  
form, and then an FFT to 250 kHz is performed on the results  
of the test. Based on the first 9 harmonics of the fundamental  
1037 Hz and the first 3 harmonics of the 49.07 kHz output  
waves, the total harmonic distortion of the device is calculated.  
Neither a deglitcher nor an MSB trim is used during the THD  
test.  
The circuit design, layout and manufacturing techniques em-  
ployed in the production of the AD766 result in excellent THD  
performance. Figure 9 shows the typical unadjusted THD per-  
formance of the AD766 for various amplitudes of 1 kHz and  
50 kHz sine waves. As can be seen, the AD766 offers excellent  
performance even at amplitudes as low as 60 dB. Figure 10  
illustrates the typical THD versus frequency performance from  
the internal amplifier for a filtered AD766 output. At frequen-  
cies greater than approximately 30 kHz, depending on the low-  
pass filter used, an improvement in THD of 3–4 dB over the  
performance shown in the figure can be achieved. Figure 11  
illustrates the consistent THD performance of the AD766  
over temperature.  
Figure 6. Alternate Recommended Schematic  
Figure 7. Power Dissipation vs. Clock Frequency  
As with most linear circuits, changes in the power supplies will  
affect the output of the DAC. Analog Devices recommends that  
well regulated power supplies with less than 1% ripple be incor-  
porated into the design of any system using these device.  
MEASUREMENT OF TOTAL HARMONIC DISTORTION  
The THD specification of a DSP DAC represents the amount  
of undesirable signal produced during reconstruction of a digital  
waveform. To account for the variety of operating conditions  
Figure 9. Typical Unadjusted THD  
Figure 8. Distortion Test Circuit  
–6–  
REV. A