ADCV0831
8 Bit Serial I/O Low Voltage Low Power ADC with
Auto Shutdown in a SOT Package
General Description
The ADCV0831 is a low voltage 8-bit successive approxima-
tion A/D converter with serial I/O. The I/O is a 3-wire serial in-
terface compatible with NSC's MICROWIRE
TM
& Motorola's
SPI standards. It easily interfaces with standard shift regis-
ters or microprocessors.
Low voltage and auto shutdown features make the
ADCV0831 ideal for portable battery operated electronic de-
vices. The main benefits are most apparent in small portable
electronic devices. The tiny A/D converter can be placed
anywhere on the board.
Applications
n
Digitizing automotive sensors
n
Process control monitoring
n
Remote sensing in noisy environments
n
Instrumentation
n
Test systems
n
Embedded diagnostics
Features
n
Tiny 6-pin SOT 23 package
n
Serial digital data link requires few I/O pins
n
Auto Shutdown
n
0V to 3V analog input range with single 3V power
supply
n
TTL/CMOS input/output compatible
Key Specifications
(For 3V supply, typical, unless otherwise noted.)
n
Resolution:
8 bits
n
Conversion time (f
C
= 700 kHz):
16s
n
Low power dissipation:
720W
n
Single supply:
2.7V to 5V
DC
n
Linearity error:
1.5LSB over temperature
n
No missing codes over temperature
n
Shutdown supply current 10nA
Ordering Information
Temperature Range
(0C
T
j
+70C)
Package
Supplied As
ADCV0831M6
MA06A
1k Units Tape and Reel
ADCV0831M6X
MA06A
3k Units Tape and Reel
Connection Diagram
TRI-STATE
is a registered trademark of National Semiconductor Corporation.
COPS
TM
microcontrollers and MICROWIRE
TM
are trademarks of National Semiconductor Corporation.
ADCV0831
DS100104-1
February 2000
ADCV0831
8
Bit
Serial
I/O
Low
V
oltage
Low
Power
ADC
with
Auto
Shutdown
in
a
SOT
Package
2000 National Semiconductor Corporation
DS100104
www.national.com
Absolute Maximum Ratings
(Notes 1, 3)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage (V
CC
)
5.5V
Voltage at Inputs and Outputs
-0.3V to V
CC
+ 0.3V
Input Current at Any Pin (Note 4)
5 mA
Package Input Current (Note 4)
20 mA
Power Dissipation at T
A
= 25C
(Note 5)
470 mW
ESD Susceptibility (Note 6)
2000V
Soldering Temperature (Note 7)
Convection Infrared (15 sec.)
215C
Wave Soldering (4 sec.) (Note 7)
260C
Storage Temperature
-65C to +150C
Thermal Resistance (
JA
)
265C/W
Operating Ratings
(Notes 2, 3)
Temperature Range
0C
T
j
70C
Supply Voltage (V
CC
)
2.7V
DC
to 5V
Electrical Characteristics
The following specifications apply for V
CC
= 3V
DC
, and f
CLK
= 500 kHz unless otherwise specified. Boldface limits apply for
T
A
= T
J
= T
MIN
to T
MAX
; all other limits T
A
= T
J
= 25C.
Symbol
Parameter
Conditions
Typical
(Note 8)
Limits
(Note 9)
Units
Integral Linearity Error
0.6
1.5
LSB (max)
Offset Error
0.1
1.5
LSB (max)
Full Scale Error
0.3
1.5
LSB (max)
Resolution
8
Bits (min)
V
IN
Analog Input Voltage
(V
CC
+ 0.05)
V (max)
(GND - 0.05)
V (min)
V
IN(1)
Logical "1" Input Voltage
V
CC
= 3V
2.0
V (min)
V
IN(0)
Logical "0" Input Voltage
V
CC
= 3V
0.8
V (max)
I
IN(1)
Logical "1" Input Current
V
IN
= 3V
0.01
1
A (max)
I
IN(0)
Logical "0" Input Current
V
IN
= 0V
0.01
-1
A (max)
V
OUT(1)
Logical "1" Output Voltage
I
out
=-360A
2.8
2.4
V (min)
V
OUT(0)
Logical "0" Output Voltage
I
out
=1.6 mA
0.24
0.4
V (max)
I
OUT
TRI-STATE
Output Current
V
OUT
= 0V
0.01
3.0
A (max)
I
SOURCE
Output Source Current
V
OUT
= 0V
2.6
1.0
mA (min)
I
SINK
Output Sink Current
V
OUT
= 3V
7.4
3.0
mA (min)
I
CC
Supply Current
CS = HIGH
0.01
30
A (max)
CS = LOW
200
400
A (max)
AC Electrical Characteristics
The following specifications apply for V
CC
= +3 V
DC
, and t
r
= t
f
= 20 ns unless otherwise specified. Boldface limits apply for
T
A
= T
J
= T
MIN
to T
MAX
; all other limits T
A
= T
J
= 25C.
Symbol
Parameter
Conditions
Typical
Limits
Units
(Note 8)
(Note 9)
f
CLK
Clock Frequency
700
kHz (max)
10
kHz (min)
t
SET-UP
CS failing edge to CLK rising edge
25
ns
Clock Duty Cycle
40
% (min)
60
% (max)
T
C
Conversion Time
11
Clock
Periods
t
pd
CLK Falling Edge to Data Valid
Low to High
C
L
= 100 pF
142
250
ns (max)
High to Low
70
200
t
1H
, t
0H
CS Rising Edge to Data Output TRI-STATE
C
L
= 100 pF, R
L
=2
k
75
250
ns (max)
(see TRI-STATE Test Circuits)
C
L
= 100 pF, R
L
= 10
k
50
ADCV0831
www.national.com
2
AC Electrical Characteristics
(Continued)
The following specifications apply for V
CC
= +3 V
DC
, and t
r
= t
f
= 20 ns unless otherwise specified. Boldface limits apply for
T
A
= T
J
= T
MIN
to T
MAX
; all other limits T
A
= T
J
= 25C.
Symbol
Parameter
Conditions
Typical
Limits
Units
(Note 8)
(Note 9)
C
IN
Capacitance of Logic Inputs
5
pF
C
OUT
Capacitance of Logic Outputs
5
pF
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.
Note 2: Operating Ratings indicate conditions for which the device is functional. These ratings do not guarantee specific performance limits. For guaranteed speci-
fications and test conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. Some performance character-
istics may degrade when the device is not operated under the listed test conditions.
Note 3: All voltages are measured with respect to GND = 0 V
DC
, unless otherwise specified.
Note 4: When the input voltage V
IN
at any pin exceeds the power supplies (V
IN
<
GND or V
IN
>
V
CC
) the current at that pin should be limited to 5 mA. The 20 mA
maximum package input current rating limits the number of pins that can safely exceed the power supplies with an input current of 5 mA to four pins.
Note 5: The maximum power dissipation must be derated at elevated temperatures and is dictated by T
JMAX
,
JA
and the ambient temperature, T
A
. The maximum
allowable power dissipation at any temperature is P
D
= (T
JMAX
- T
A
)/
JA
or the number given in the Absolute Maximum Ratings, whichever is lower.
Note 6: Human body model, 100 pF capacitor discharged through a 1.5 k
resistor.
Note 7: See AN450 "Surface Mounting Methods and Their Effect on Product Reliability" or Linear Data Book section "Surface Mount" for other methods of soldering
surface mount devices.
Note 8: Typicals are at T
J
= 25C and represent the most likely parametric norm.
Note 9: Guaranteed to National's AOQL (Average Outgoing Quality Level).
Typical Performance Characteristics
The following specifications apply for V
CC
= 3V, unless otherwise specified
Integral Linearity Error vs
Supply Voltage
DS100104-62
Linearity Error vs
Temperature
DS100104-56
Linearity Error vs
Clock Frequency
DS100104-55
Power Supply Current
vs Temperature
DS100104-57
Output Current vs
Temperature
DS100104-58
Power Supply Current
vs Clock Frequency
DS100104-61
ADCV0831
www.national.com
3
TRI-STATE Test Circuits and Waveforms
Timing Diagrams
DS100104-8
Data Output Timing
DS100104-10
Start Conversion Timing
DS100104-11
ADCV0831
www.national.com
4
Timing Diagrams
(Continued)
Timing
DS100104-12
ADCV0831
www.national.com
5
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