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ADC0831,32,38英文手册
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ADC0831,32,38英文手册
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ADC0831/ADC0832/ADC0834/ADC0838
8-Bit Serial I/O A/D Converters with Multiplexer Options
General Description
The ADC0831 series are 8-bit successive approximation A/D
converters with a serial I/O and configurable input multiplex-
ers with up to 8 channels. The serial I/O is configured to
comply with the NSC MICROWIRE
™
serial data exchange
standard for easy interface to the COPS
™
family of proces-
sors, and can interface with standard shift registers or µPs.
The 2-, 4- or 8-channel multiplexers are software configured
for single-ended or differential inputs as well as channel as-
signment.
The differential analog voltage input allows increasing the
common-mode rejection and offsetting the analog zero input
voltage value. In addition, the voltage reference input can be
adjusted to allow encoding any smaller analog voltage span
to the full 8 bits of resolution.
Features
n NSC MICROWIRE compatible — direct interface to
COPS family processors
n Easy interface to all microprocessors, or operates
“stand-alone”
n Operates ratiometrically or with 5 V
DC
voltage
reference
n No zero or full-scale adjust required
n 2-, 4- or 8-channel multiplexer options with address logic
n Shunt regulator allows operation with high voltage
supplies
n 0V to 5V input range with single 5V power supply
n Remote operation with serial digital data link
n TTL/MOS input/output compatible
n 0.3" standard width, 8-, 14- or 20-pin DIP package
n 20 Pin Molded Chip Carrier Package (ADC0838 only)
n Surface-Mount Package
Key Specifications
n Resolution 8 Bits
n Total Unadjusted Error
±
1
⁄
2
LSB and
±
1 LSB
n Single Supply 5 V
DC
n Low Power 15 mW
n Conversion Time 32 µs
Typical Application
TRI-STATE
®
is a registered trademark of National Semiconductor Corporation.
COPS
™
and MICROWIRE
™
are trademarks of National Semiconductor Corporation.
DS005583-1
July 1999
ADC0831/ADC0832/ADC0834/ADC0838 8-Bit Serial I/O A/D Converters with Multiplexer Options
© 1999 National Semiconductor Corporation DS005583 www.national.com
Connection Diagrams
ADC0838 8-Channel Mux
Small Outline/Dual-In-Line Package
(WM and N)
DS005583-8
Top View
ADC0834 4-Channel MUX
Small Outline/Dual-In-Line Package
(WM and N)
DS005583-30
COM internally connected to A GND
Top View
Top View
ADC0832 2-Channel MUX
Dual-In-Line Package (N)
DS005583-31
COM internally connected to GND.
V
REF
internally connected to V
CC
.
Top View
Top View
ADC0832 2-Channel MUX
Small Outline Package (WM)
DS005583-41
Top View
ADC0831 Single
Differential Input
Dual-In-Line Package (N)
DS005583-32
Top View
ADC0831 Single Differential Input
Small Outline Package (WM)
DS005583-42
Top View
ADC0838 8-Channel MUX
Molded Chip Carrier (PCC)
Package (V)
DS005583-33
www.national.com 2
Ordering Information
Part Number Analog Input Total Package Temperature
Channels Unadjusted Error Range
ADC0831CCN 1
±
1 Molded (N) 0˚C to +70˚C
ADC0831CCWM SO(M) 0˚C to +70˚C
ADC0832CIWM 2
±
1 SO(M) −40˚C to +85˚C
ADC0832CCN Molded (N) 0˚C to +70˚C
ADC0832CCWM SO(M) 0˚C to +70˚C
ADC0834BCN 4
±
1
⁄
2
Molded (N) 0˚C to +70˚C
ADC0834CCN
±
1 Molded (N) 0˚C to +70˚C
ADC0834CCWM SO(M) 0˚C to +70˚C
ADC0838BCV 8
±
1
⁄
2
PCC (V) 0˚C to +70˚C
ADC0838CCV
±
1 PCC (V) 0˚C to +70˚C
ADC0838CCN Molded (N) 0˚C to +70˚C
ADC0838CIWM SO(M) −40˚C to +85˚C
ADC0838CCWM SO(M) 0˚C to +70˚C
See NS Package Number M14B, M20B, N08E, N14A, N20A or V20A
www.national.com3
Absolute Maximum Ratings (Notes 1, 2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Current into V
+
(Note 3) 15 mA
Supply Voltage, V
CC
(Note 3) 6.5V
Voltage
Logic Inputs −0.3V to V
CC
+ 0.3V
Analog Inputs −0.3V to V
CC
+ 0.3V
Input Current per Pin (Note 4)
±
5mA
Package
±
20 mA
Storage Temperature −65˚C to +150˚C
Package Dissipation
at T
A
=
25˚C (Board Mount) 0.8W
Lead Temperature (Soldering 10 sec.)
Dual-In-Line Package (Plastic) 260˚C
Molded Chip Carrier Package
Vapor Phase (60 sec.) 215˚C
Infrared (15 sec.) 220˚C
ESD Susceptibility (Note 5) 2000V
Operating Ratings (Notes 1, 2)
Supply Voltage, V
CC
4.5 V
DC
to 6.3 V
DC
Temperature Range T
MIN
≤T
A
≤T
MAX
ADC0832/8CIWM −40˚C to +85˚C
ADC0834BCN,
ADC0838BCV,
ADC0831/2/4/8CCN,
ADC0838CCV,
ADC0831/2/4/8CCWM 0˚C to +70˚C
Converter and Multiplexer Electrical Characteristics The following specifications apply for
V
CC
=
V+
=
V
REF
=
5V, V
REF
≤ V
CC
+0.1V, T
A
=
T
j
=
25˚C, and f
CLK
=
250 kHz unless otherwise specified. Boldface limits
apply from T
MIN
to T
MAX
.
Parameter
Conditions CIWM Devices BCV, CCV, CCWM, BCN
and CCN Devices
Typ Tested Design Typ Tested Design Units
(Note 12) Limit Limit (Note 12) Limit Limit
(Note 13) (Note 14) (Note 13) (Note 14)
CONVERTER AND MULTIPLEXER CHARACTERISTICS
Total Unadjusted Error V
REF
=
5.00 V
ADC0838BCV (Note 6)
±
1
⁄
2
±
1
⁄
2
ADC0834BCN
±
1
⁄
2
±
1
⁄
2
LSB
(Max)
ADC0838CCV
±
1
±
1
ADC0831/2/4/8CCN
±
1
±
1
ADC0831/2/4/8CCWM
±
1
±
1
ADC0832/8CIWM
±
1
Minimum Reference 3.5 1.3 3.5 1.3 1.3 kΩ
Input Resistance (Note 7)
Maximum Reference 3.5 5.9 3.5 5.4 5.9 kΩ
Input Resistance (Note 7)
Maximum Common-Mode
Input Range (Note 8)
V
CC
+0.05 V
CC
+0.05 V
CC
+0.05 V
Minimum Common-Mode
Input Range (Note 8)
GND −0.05 GND −0.05 GND−0.05 V
DC Common-Mode Error
±
1/16
±
1
⁄
4
±
1/16
±
1
⁄
4
±
1
⁄
4
LSB
Change in zero 15 mA into V+
error from V
CC
=
5V V
CC
=
N.C.
to internal zener V
REF
=
5V
operation (Note 3) 1 1 1 LSB
V
Z
, internal MIN 15 mA into V+ 6.3 6.3 6.3
diode breakdown MAX 8.5 8.5 8.5 V
(at V
+
) (Note 3)
Power Supply Sensitivity V
CC
=
5V
±
5
%
±
1/16
±
1
⁄
4
±
1
⁄
4
±
1/16
±
1
⁄
4
±
1
⁄
4
LSB
I
OFF
, Off Channel Leakage On Channel
=
5V, −0.2 −0.2 −1 µA
Current (Note 9) Off Channel
=
0V −1
On Channel
=
0V, +0.2 +0.2 +1 µA
Off Channel
=
5V +1
www.national.com 4
Converter and Multiplexer Electrical Characteristics The following specifications apply for
V
CC
=
V+
=
V
REF
=
5V, V
REF
≤ V
CC
+0.1V, T
A
=
T
j
=
25˚C, and f
CLK
=
250 kHz unless otherwise specified. Boldface limits
apply from T
MIN
to T
MAX
. (Continued)
Parameter
Conditions CIWM Devices BCV, CCV, CCWM, BCN
and CCN Devices
Typ Tested Design Typ Tested Design Units
(Note 12) Limit Limit (Note 12) Limit Limit
(Note 13) (Note 14) (Note 13) (Note 14)
CONVERTER AND MULTIPLEXER CHARACTERISTICS
I
ON
, On Channel Leakage On Channel
=
0V, −0.2 −0.2 −1 µA
Current (Note 9) Off Channel
=
5V −1
On Channel
=
5V, +0.2 +0.2 +1 µA
Off Channel
=
0V +1
DIGITAL AND DC CHARACTERISTICS
V
IN(1)
, Logical “1” Input V
CC
=
5.25V 2.0 2.0 2.0 V
Voltage (Min)
V
IN(0)
, Logical “0” Input V
CC
=
4.75V 0.8 0.8 0.8 V
Voltage (Max)
I
IN(1)
, Logical “1” Input V
IN
=
5.0V 0.005 1 0.005 1 1 µA
Current (Max)
I
IN(0)
, Logical “0” Input V
IN
=
0V −0.005 −1 −0.005 −1 −1 µA
Current (Max)
V
OUT(1)
, Logical “1” Output V
CC
=
4.75V
Voltage (Min) I
OUT
=
−360 µA 2.4 2.4 2.4 V
I
OUT
=
−10 µA 4.5 4.5 4.5 V
V
OUT(0)
, Logical “0” Output V
CC
=
4.75V 0.4 0.4 0.4 V
Voltage (Max) I
OUT
=
1.6 mA
I
OUT
, TRI-STATE Output V
OUT
=
0V −0.1 −3 −0.1 −3 −3 µA
Current (Max) V
OUT
=
5V 0.1 3 0.1 +3 +3 µA
I
SOURCE
, Output Source V
OUT
=
0V −14 −6.5 −14 −7.5 −6.5 mA
Current (Min)
I
SINK
, Output Sink Current (Min) V
OUT
=
V
CC
16 8.0 16 9.0 8.0 mA
I
CC
, Supply Current (Max)
ADC0831, ADC0834, 0.9 2.5 0.9 2.5 2.5 mA
ADC0838
ADC0832 Includes Ladder 2.3 6.5 2.3 6.5 6.5 mA
Current
AC Characteristics
The following specifications apply for V
CC
=
5V, t
r
=
t
f
=
20 ns and 25˚C unless otherwise specified.
Typ Tested Design Limit
Parameter Conditions (Note 12) Limit Limit Units
(Note 13) (Note 14)
f
CLK
, Clock Frequency Min 10 kHz
Max 400 kHz
t
C
, Conversion Time Not including MUX Addressing Time 8 1/f
CLK
Clock Duty Cycle Min 40
%
(Note 10) Max 60
%
t
SET-UP
, CS Falling Edge or 250 ns
Data Input Valid to CLK
Rising Edge
t
HOLD
, Data Input Valid 90 ns
after CLK Rising Edge
www.national.com5
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