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器件描述：8-Bit 2 ms Serial I/O A/D Converters with MUX, Reference, and Track/Hold
器件厂商：NSC [National Semiconductor]
厂商主页：http://www.national.com
文件大小：419.79KB
文件页数：24
PDF阅读：ADC08238.pdf (点击阅读器件资料)
摘要：
TL/H/11015
ADC08231/ADC08234/ADC08238
8-Bit
2
m
s
Serial
I/O
A/D
Converters
with
MUX,
Reference,
and
Track/Hold
December 1994
ADC08231/ADC08234/ADC08238 8-Bit 2 ms Serial I/O
A/D Converters with MUX, Reference, and Track/Hold
General Description
The ADC08231/ADC08234/ADC08238 are 8-bit succes-
sive approximation A/D converters with serial I/O and con-
figurable input multiplexers with up to 8 channels. The serial
I/O is configured to comply with the NSC MICROWIRE
TM
serial data exchange standard for easy interface to the
COPS
TM
family of controllers, and can easily interface with
standard shift registers or microprocessors.
Designed for high-speed/low-power applications, the devic-
es are capable of a fast 2 ms conversion when used with a
4 MHz clock.
All three devices provide a 2.5V band-gap derived reference
with guaranteed performance over temperature.
A track/hold function allows the analog voltage at the posi-
tive input to vary during the actual A/D conversion.
The analog inputs can be configured to operate in various
combinations of single-ended, differential, or pseudo-differ-
ential modes. In addition, input voltage spans as small as 1V
can be accommodated.
Applications
Y
High-speed data acquisition
Y
Digitizing automotive sensors
Y
Process control/monitoring
Y
Remote sensing in noisy environments
Y
Disk drives
Y
Portable instrumentation
Y
Test systems
Features
Y
Serial digital data link requires few I/O pins
Y
Analog input track/hold function
Y
4- or 8-channel input multiplexer options with address
logic
Y
On-chip 2.5V band-gap reference (g2% over tempera-
ture guaranteed)
Y
No zero or full scale adjustment required
Y
TTL/CMOS input/output compatible
Y
0V to 5V analog input range with single 5V power
supply
Y
Pin compatible with Industry-Standards ADC0831/4/8
Key Specifications
Y
Resolution 8 Bits
Y
Conversion time (f
C
e 4 MHz) 2 ms (Max)
Y
Power dissipation 20 mW (Max)
Y
Single supply 5 V
DC
(g5%)
Y
Total unadjusted error g(/2 LSB and g1 LSB
Y
Linearity Error (V
REF
e 2.5V) g(/2 LSB
Y
No missing codes (over temperature)
Y
On-board Reference a2.5V g1.5% (Max)
ADC08238 Simplified Block Diagram
TL/H/11015–4
TRI-STATE is a registered trademark of National Semiconductor Corporation.
COPSTM microcontrollers and MICROWIRETM are trademarks of National Semiconductor Corporation.
C
1995 National Semiconductor Corporation RRD-B30M75/Printed in U. S. A.
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