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型号: | ADC0808 |
厂商: |
|
分类: | 半导体 |
描述: | 8-bit uP compatible A/D converters with 8-channel multiplexer |
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ADC0808的详细信息
Feature: | CMOS ADC with 8-Ch. Multiplexers |
---|
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
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