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CDB5521 参数 Datasheet PDF下载

CDB5521图片预览
型号: CDB5521
PDF下载: 下载PDF文件 查看货源
内容描述: 评估板和软件 [Evaluation Board and Software]
分类和应用:
文件页数/大小: 28 页 / 1051 K
品牌: CIRRUS [ CIRRUS LOGIC ]
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CDB5521/22/23/24/28  
of this document in Figures 12, 13, and 14 for ref-  
erence.  
1.3 Using the Evaluation Board  
The CS5521/22/23/24/28 are highly integrated  
ADCs. They contain a multiplexer, an instrumenta-  
tion amplifier (IA), a programmable gain amplifier  
(PGA), an on-chip charge pump drive (CPD), and  
programmable output word rates (OWR). The IA  
provides a set gain of 20 while the PGA sets the in-  
put levels of the ADC at either 25 mV, 55 mV,  
100 mV, 1 V, 2.5 V, or 5 V (for VREF = 2.5 V).  
The CPD provides a square wave output. This out-  
put, along with two diodes and two capacitors, is  
used to supply the negative supply to the IA, en-  
abling measurements of ground referenced signals.  
The ADC’s digital filter allows the user to select  
output word rates (OWR’s) from 1.88 Hz up to  
101 Hz. higher output word rates can be attained  
when a faster clock source is used. Since the  
CS5521/22/23/24/28 have such a high degree of in-  
tegration and flexibility, the CS5521/23 or  
CS5522/24/28 data sheet should be read thorough-  
ly before and consulted during the use of the  
CDB5521/22/23/24/28. Table 1 lists the different  
headers on the CDB5521/22/23/24/28 and their  
functions. The locations of these headers are  
marked on the top of the board, and the silkscreen  
and layout of the board can also be found at the end  
1.4. Power Connections  
Figure 4 illustrates the power supply connections to  
the evaluation board. The +5 V Analog supplies the  
analog section of the evaluation board, the LT1019  
and the ADC. The -5 V Analog supplies the nega-  
tive bias voltage circuitry. The +5 V Digital sup-  
plies a separate five volts to the digital section of  
the evaluation board, the 80C51, the reset circuitry,  
and the RS-232 interface circuitry.  
1.5 Negative Bias Voltage  
The evaluation board provides three means of sup-  
plying the Negative Bias Voltage (NBV). HDR4  
(Header 4) selects between them. When HRD4 is in  
position one, the LM337 supplies NBV with an ad-  
justable voltage. R16 is used to adjust this voltage  
between -1.25 V and -5 V. When in position two,  
HDR4 grounds NBV. And by setting HDR4 to po-  
sition three, the converter’s Charge Pump Drive  
provides NBV with a dc rectified voltage, nominal-  
ly -2.1 V.  
Note: NBV should not exceed a voltage more  
negative than -3.0 V.  
+5V Analog  
Z3  
+5V Analog  
+5V Digital  
Z2  
+5V Digital  
+
+
C8  
47µF  
C13  
0.1µF  
C6  
47µF  
C12  
0.1µF  
P6KE6V8P  
P6KE6V8P  
AGND  
DGND  
+
Z1  
P6KE6V8P  
C5  
47µF  
C10  
0.1µF  
-5V Analog  
-5V Analog  
Figure 4. Power Supplies  
8
DS317DB2  
 
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