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Teilenummer | ADC0817 |
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Beschreibung | 8-Bit P Compatible A/D Converters with 16-Channel Multiplexer | |
Hersteller | National Semiconductor | |
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Gesamt 13 Seiten June 1999
ADC0816/ADC0817
8-Bit µP Compatible A/D Converters
with 16-Channel Multiplexer
General Description
The ADC0816, ADC0817 data acquisition component is a
monolithic CMOS device with an 8-bit analog-to-digital con-
verter, 16-channel multiplexer and microprocessor compat-
ible control logic. The 8-bit A/D converter uses successive
approximation as the conversion technique. The converter
features a high impedance chopper stabilized comparator, a
256R voltage divider with analog switch tree and a succes-
sive approximation register. The 16-channel multiplexer can
directly access any one of 16-single-ended analog signals,
and provides the logic for additional channel expansion. Sig-
nal conditioning of any analog input signal is eased by direct
access to the multiplexer output, and to the input of the 8-bit
A/D converter.
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.
The design of the ADC0816, ADC0817 has been optimized
by incorporating the most desirable aspects of several A/D
conversion techniques. The ADC0816, ADC0817 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 similar perfor-
mance in an 8-channel, 28-pin, 8-bit A/D converter, see the
ADC0808, ADC0809 data sheet. (See AN-258 for more in-
formation.)
Features
n Easy interface to all microprocessors
n Operates ratiometrically or with 5 VDC or analog span
adjusted voltage reference
n 16-channel multiplexer with latched control logic
n Outputs meet TTL voltage level specifications
n 0V to 5V analog input voltage range with single 5V
supply
n No zero or full-scale adjust required
n Standard hermetic or molded 40-pin DIP package
n Temperature range −40˚C to +85˚C or −55˚C to +125˚C
n Latched TRI-STATE output
n Direct access to “comparator in” and “multiplexer out” for
signal conditioning
n ADC0816 equivalent to MM74C948
n ADC0817 equivalent to MM74C948-1
Key Specifications
n Resolution
n Total Unadjusted Error
n Single Supply
n Low Power
n Conversion Time
8 Bits
±1⁄2 LSB and ±1 LSB
5 VDC
15 mW
100 µs
Block Diagram
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
© 1999 National Semiconductor Corporation DS005277
DS005277-1
www.national.com
Functional Description (Continued)
DS005277-3
FIGURE 2. 3-Bit A/D Transfer Curve
DS005277-4
FIGURE 3. 3-Bit A/D Absolute Accuracy Curve
Timing Diagram
FIGURE 4. Typical Error Curve
DS005277-5
www.national.com
FIGURE 5.
6
DS005277-7
6 Page Typical Application
*Address latches needed for 8085 and SC/MP interfacing the ADC0816, 17 to a microprocessor
Microprocessor Interface Table
DS005277-16
PROCESSOR
8080
8085
Z-80
SC/MP
6800
READ
MEMR
RD
RD
NRDS
VMA•φ 2•R/W
WRITE
MEMW
WR
WR
NWDS
VMA•Q2•R/W
INTERRUPT (COMMENT)
INTR (Thru RST Circuit)
INTR (Thru RST Circuit)
INT (Thru RST Circuit, Mode 0)
SA (Thru Sense A)
IRQA or IRQB (Thru PIA)
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12 Page | ||
Seiten | Gesamt 13 Seiten | |
PDF Download | [ ADC0817 Schematic.PDF ] |
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