Image ADC0804
型号: ADC0804
厂商: Texas Instruments Texas Instruments
分类: 集成电路
描述: 8-bit uP compatible A/D converters
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November 1999  
ADC0801/ADC0802/ADC0803/ADC0804/ADC0805  
8-Bit µP Compatible A/D Converters  
n Differential analog voltage inputs  
n Logic inputs and outputs meet both MOS and TTL  
voltage level specifications  
n Works with 2.5V (LM336) voltage reference  
n On-chip clock generator  
n 0V to 5V analog input voltage range with single 5V  
supply  
General Description  
The ADC0801, ADC0802, ADC0803, ADC0804 and  
ADC0805 are CMOS 8-bit successive approximation A/D  
converters that use  
a
differential potentiometric  
ladder — similar to the 256R products. These converters are  
designed to allow operation with the NSC800 and INS8080A  
derivative control bus with TRI-STATE® output latches di-  
rectly driving the data bus. These A/Ds appear like memory  
locations or I/O ports to the microprocessor and no interfac-  
ing logic is needed.  
n No zero adjust required  
n 0.3" standard width 20-pin DIP package  
n 20-pin molded chip carrier or small outline package  
n Operates ratiometrically or with 5 VDC, 2.5 VDC, or  
analog span adjusted voltage reference  
Differential analog voltage inputs allow increasing the  
common-mode rejection and offsetting the analog zero input  
voltage value. In addition, the voltage reference input can be  
adjusted to allow encoding any smaller analog voltage span  
to the full 8 bits of resolution.  
Key Specifications  
n Resolution  
8 bits  
LSB and 1 LSB  
1
1
2
±
±
±
n Total error  
n Conversion time  
4
LSB,  
Features  
100 µs  
n Compatible with 8080 µP derivatives — no interfacing  
logic needed - access time - 135 ns  
n Easy interface to all microprocessors, or operates “stand  
alone”  
Connection Diagram  
ADC080X  
Dual-In-Line and Small Outline (SO) Packages  
DS005671-30  
See Ordering Information  
Ordering Information  
TEMP RANGE  
0˚C TO 70˚C  
ADC0802LCWM  
ADC0804LCWM  
0˚C TO 70˚C  
−40˚C TO +85˚C  
ADC0801LCN  
ADC0802LCN  
ADC0803LCN  
1
±
±
±
±
4  
2  
2  
Bit Adjusted  
Bit Unadjusted  
Bit Adjusted  
1
1
ERROR  
1Bit Unadjusted  
ADC0804LCN  
ADC0805LCN/ADC0804LCJ  
PACKAGE OUTLINE  
M20B — Small  
Outline  
N20A — Molded DIP  
TRI-STATE® is a registered trademark of National Semiconductor Corp.  
Z-80® is a registered trademark of Zilog Corp.  
© 1999 National Semiconductor Corporation  
DS005671  
www.national.com