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ADS7819P 参数 Datasheet PDF下载

ADS7819P图片预览
型号: ADS7819P
PDF下载: 下载PDF文件 查看货源
内容描述: 12位800kHz的采样CMOS模拟数字转换器 [12-Bit 800kHz Sampling CMOS ANALOG-to-DIGITAL CONVERTER]
分类和应用: 转换器模数转换器光电二极管
文件页数/大小: 11 页 / 320 K
品牌: BB [ BURR-BROWN CORPORATION ]
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The ADS7819 will begin tracking the input signal at the end  
of the conversion. Allowing 1.25µs between convert com-  
mands assures accurate acquisition of a new signal.  
BASIC OPERATION  
Figure 1 shows a basic circuit to operate the ADS7819.  
Taking R/C (pin 23) LOW for 40ns will initiate a conver-  
sion. BUSY (pin 25) will go LOW and stay LOW until the  
conversion is completed and the output registers are up-  
dated. Data will be output in Binary Two’s Complement  
with the MSB on D11 (pin 6). BUSY going HIGH can be  
used to latch the data. All convert commands will be ignored  
while BUSY is LOW.  
STARTING A CONVERSION  
The combination of CS (pin 24) and R/C (pin 23) LOW for  
a minimum of 40ns puts the sample/hold of the ADS7819 in  
the hold state and starts a conversion. BUSY (pin 25) will go  
LOW and stay LOW until the conversion is completed and  
the internal output register has been updated. All new  
convert commands during BUSY LOW will be ignored.  
CS  
1
R/C  
X
BUSY OPERATION  
X
1
None. Databus in Hi-Z state.  
2
The ADS7819 will begin tracking the input signal at the end  
0
Initiates conversion. Databus remains in  
Hi-Z state.  
of the conversion. Allowing 1.25µs between convert com-  
mands assures accurate acquisition of a new signal. Refer to  
Table I for a summary of CS, R/C, and BUSY states and  
Figures 2 and 3 for timing parameters.  
0
0
1
Initiates conversion. Databus enters Hi-Z  
state.  
1
Conversion completed. Valid data from the  
most recent conversion on the databus.  
0
0
1
1
0
1
0
0
Enables databus with valid data from the  
most recent conversion.  
DESCRIPTION  
ANALOG VALUE  
±2.5V  
DIGITAL OUTPUT  
Full Scale Range  
Conversion in progress. Databus in Hi-Z  
state, enabled when the conversion is completed.  
BINARY TWO'S COMPLEMENT  
Least Significant  
Bit (LSB)  
1.22mV  
BINARY CODE  
HEX CODE  
Conversion in progress. Databus in Hi-Z  
state, enabled when the conversion is completed.  
+Full Scale  
(2.5V – 1LSB)  
2.499V  
0111 1111 1111  
7FF  
Conversion completed. Valid data from the  
most recent conversion in the output register  
but the output pins D11-D0 are tri-stated.  
Midscale  
0V  
0000 0000 0000  
1111 1111 1111  
000  
FFF  
One LSB below  
Midscale  
–1.22mV  
X
X
0
New convert commands ignored. Conversion  
in progress.  
–Full Scale  
–2.5V  
1000 0000 0000  
800  
Table I. Control Line Functions for ‘read’ and ‘convert’.  
TABLE II. Ideal Input Voltages and Output Codes.  
0.1µF 10µF  
+5V  
+
50  
±2.5V  
1
2
28  
27  
26  
25  
24  
23  
22  
21  
20  
19  
18  
17  
16  
15  
0.1µF 10µF  
+
–5V  
3
10µF  
+
4
BUSY  
0.1µF  
5
Convert Pulse  
D11 (MSB)  
6
D10  
D9  
D8  
D7  
D6  
D5  
D4  
7
ADS7819  
8
40ns min  
9
10  
11  
12  
13  
14  
NC  
D0 (LSB)  
D1  
D2  
D3  
FIGURE 1. Basic Operation  
®
7
ADS7819