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| 型号： | ADC0851CIN |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | ADC |
| 英文描述： | 8-Bit Analog Data Acquisition and Monitoring Systems |
| 中文描述： | 2-CH 8-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDIP16 |
| 封装： | PLASTIC, DIP-16 |
| 文件页数： | 1/36页 |
| 文件大小： | 581K |
| 代理商： | ADC0851CIN |
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TL/H/11021
A
January 1995
ADC0851 and ADC0858 8-Bit Analog Data
Acquisition and Monitoring Systems
General Description
The ADC0851 and ADC0858 are 2 and 8 input analog data
acquisition systems. They can function as conventional mul-
tiple input A/D converters, automatic scanning A/D convert-
ers or programmable analog ‘‘watchdog’’ systems. In
‘‘watchdog’’ mode they monitor analog inputs and deter-
mine whether these inputs are inside or outside user pro-
grammed window limits. This monitoring process takes
place independent of the host processor. When any input
falls outside of its programmed window limits, an interrupt is
automatically generated which flags the processor; the chip
can then be interrogated as to exactly which channels
crossed which limits.
The advantage of this approach is that its frees the proces-
sor from having to frequently monitor analog variables. It
can consequently save having to insert many A/D subrou-
tine calls throughout real time application code. In control
systems where many variables are continually being moni-
tored this can significantly free up the processor, especially
if the variables are DC or slow varying signals.
The Auto A/D conversion feature allows the device to scan
through selected input channels, performing an A/D conver-
sion on each channel without the need to select a new
channel after each conversion.
Applications
Y
Instrumentation monitoring and process control
Y
Digitizing automotive sensor signals
Y
Embedded diagnostics
Key Specifications
Y
Resolution
8 Bits
Y
Total error
g
(/2
LSB or
g
1 LSB
Y
Low power
50 mW
Y
Conversion time
18
m
s/Channel
2
m
s/Limit
Y
Limit comparison time
Features
Y
Watchdog operation signals processor when any
channel is outside user programmed window limits
Y
Frees microprocessor from continually monitoring
analog signals and simplifies applications software
Y
2 (ADC0851) or 8 (ADC0858) analog input channels
Y
Single ended or differential input pairs
Y
COM input for DC offsetting of input voltage
Y
4 (ADC0851) and 16 (ADC0858), 8-bit programmable
limits
Y
NSC MICROWIRE
TM
interface
Y
Power fail detection
Y
Auto A/D conversion feature
Y
Single 5V supply
Y
Window limits are user programmable via serial inter-
face
Simplified Block Diagram
TL/H/11021–22
FIGURE 1
TRI-STATE
é
is a registered trademark of National Semiconductor Corporation.
MICROWIRE
TM
is a trademark of National Semiconductor Corporation.
C
1995 National Semiconductor Corporation
RRD-B30M75/Printed in U. S. A.
相关PDF资料 |
PDF描述 |
|---|---|
| ADC0851CIV | 8-Bit Analog Data Acquisition and Monitoring Systems |
| ADC0858CIN | 8-Bit Analog Data Acquisition and Monitoring Systems |
| ADC0858CIV | 8-Bit Analog Data Acquisition and Monitoring Systems |
| ADC0881 | 8-Bit 20 MSPS Flash A/D Converter |
| ADC0881CCC | 8-Bit 20 MSPS Flash A/D Converter |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ADC0851CIV | 制造商:NSC 制造商全称:National Semiconductor 功能描述:8-Bit Analog Data Acquisition and Monitoring Systems |
| ADC0851CMJ/883 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Single-Ended Data Acquisition System |
| ADC0852 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:Multiplexed Comparator with 8-Bit Reference Divider |
| ADC0852BCJ/A+ | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog Comparator |
| ADC0852BCN | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog Comparator |
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