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PDF ADC08231CIWM Data sheet ( Hoja de datos )
| Número de pieza | ADC08231CIWM | |
| Descripción | 8-Bit 2 ms Serial I/O A/D Converters with MUX/ Reference/ and Track/Hold | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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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 MICROWIRETM
serial data exchange standard for easy interface to the
COPSTM 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 (fC e 4 MHz)
Y Power dissipation
2 ms (Max)
20 mW (Max)
Y Single supply
Y Total unadjusted error
5 VDC (g5%)
g LSB and g1 LSB
Y Linearity Error (VREF e 2 5V)
Y No missing codes (over temperature)
g LSB
Y On-board Reference
a2 5V g1 5% (Max)
ADC08238 Simplified Block Diagram
TRI-STATE is a registered trademark of National Semiconductor Corporation
COPSTM microcontrollers and MICROWIRETM are trademarks of National Semiconductor Corporation
C1995 National Semiconductor Corporation TL H 11015
TL H 11015 – 4
RRD-B30M75 Printed in U S A
1 page  
Electrical Characteristics (Continued)
The following specifications apply for VCC e a5 VDC and fCLK e 4 MHz unless otherwise specified Boldface limits apply for
TA e TJ e TMIN to TMAX all other limits TA e TJ e 25 C
Symbol
Parameter
Conditions
ADC08231
ADC08234 and
ADC08238 with BIN
CIN BIWM
CIWM or CIMF Suffixes
Units
(Limits)
Typical
(Note 8)
Limits
(Note 9)
REFERENCE CHARACTERISTICS
VREFOUT
Output Voltage
BIN BIJ
BIWM
CIN CIJ
CIWM CMJ
25
g2%
25
g3 5%
2 5 g1 5%
2 5 g3 0%
V
DVREF DT
DVREF DIL
Temperature Coefficient
Load Regulation
(Note 17)
Sourcing
(0 s IL s a4 mA)
ADC08234
ADC08238
40
0 003
ppm C
01
Sourcing
(0 s IL s a2 mA)
ADC08231
Sinking
(b1 s IL s 0 mA)
ADC08234
ADC08238
0 003
02
0 1 % mA
(max)
05
Sinking
(b1 s IL s 0 mA)
ADC08231
02 05
Line Regulation
4 75V s VCC s 5 25V
05
6 mV
(max)
ISC
Short Circuit Current
VREF e 0V
ADC08234
ADC08238
VREF e 0V
ADC08231
8 25 mA
(max)
8 25
TSU
DVREF Dt
Start-Up Time
Long Term Stability
xVCC 0V
5V
CL e 100 mF
20
200
ms
ppm 1 kHr
5
5 Page 
Timing Diagrams (Continued)
11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet ADC08231CIWM.PDF ] | |
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