Image ADC0809
型号: ADC0809
厂商: Texas Instruments Texas Instruments
分类: 半导体
描述: 8-bit uP compatible A/D converters with 8-channel multiplexer
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October 1999  
ADC0808/ADC0809  
8-Bit µP Compatible A/D Converters with 8-Channel  
Multiplexer  
General Description  
Features  
n Easy interface to all microprocessors  
n Operates ratiometrically or with 5 VDC or analog span  
adjusted voltage reference  
The ADC0808, ADC0809 data acquisition component is a  
monolithic CMOS device with an 8-bit analog-to-digital con-  
verter, 8-channel multiplexer and microprocessor compatible  
control logic. The 8-bit A/D converter uses successive ap-  
proximation as the conversion technique. The converter fea-  
tures a high impedance chopper stabilized comparator, a  
256R voltage divider with analog switch tree and a succes-  
sive approximation register. The 8-channel multiplexer can  
directly access any of 8-single-ended analog signals.  
n No zero or full-scale adjust required  
n 8-channel multiplexer with address logic  
n 0V to 5V input range with single 5V power supply  
n Outputs meet TTL voltage level specifications  
n Standard hermetic or molded 28-pin DIP package  
n 28-pin molded chip carrier package  
The device eliminates the need for external zero and  
full-scale adjustments. Easy interfacing to microprocessors  
is provided by the latched and decoded multiplexer address  
inputs and latched TTL TRI-STATE® outputs.  
n ADC0808 equivalent to MM74C949  
n ADC0809 equivalent to MM74C949-1  
Key Specifications  
The design of the ADC0808, ADC0809 has been optimized  
by incorporating the most desirable aspects of several A/D  
conversion techniques. The ADC0808, ADC0809 offers high  
speed, high accuracy, minimal temperature dependence, ex-  
cellent long-term accuracy and repeatability, and consumes  
minimal power. These features make this device ideally  
suited to applications from process and machine control to  
consumer and automotive applications. For 16-channel mul-  
tiplexer with common output (sample/hold port) see  
ADC0816 data sheet. (See AN-247 for more information.)  
n Resolution  
8 Bits  
LSB and 1 LSB  
1
±
±
n Total Unadjusted Error  
n Single Supply  
n Low Power  
2  
5 VDC  
15 mW  
100 µs  
n Conversion Time  
Block Diagram  
DS005672-1  
See Ordering  
Information  
TRI-STATE® is a registered trademark of National Semiconductor Corp.  
© 1999 National Semiconductor Corporation  
DS005672  
www.national.com