NSC ADC0831CCJ, ADC0831BCN, ADC0831BCJ, ADC0831CMWC, ADC0831CMDC Datasheet

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 multiplex­ers 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
assignment.

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

⁄2LSB and±1 LSB

n Single Supply 5 V

DC

n Low Power 15 mW
n Conversion Time 32 µs

Typical Application

00558301

TRI-STATE®is a registered trademark of National Semiconductor Corporation.
COPS

™

and MICROWIRE™are trademarks of National Semiconductor Corporation.

July 2002

ADC0831/ADC0832/ADC0834/ADC0838 8-Bit Serial I/O A/D Converters with Multiplexer Options

© 2002 National Semiconductor Corporation DS005583 www.national.com

Connection Diagrams

ADC0838 8-Channel Mux

Small Outline/Dual-In-Line Package (WM and N)

00558308

Top View

ADC0834 4-Channel MUX

Small Outline/Dual-In-Line Package (WM and N)

00558330

COM internally connected to A GND

Top View

Top View

ADC0832 2-Channel MUX

Dual-In-Line Package (N)

00558331

COM internally connected to GND.

V

REF

internally connected to VCC.

Top View

Top View

ADC0832 2-Channel MUX

Small Outline Package (WM)

00558341

Top View

ADC0831 Single

Differential Input

Dual-In-Line Package (N)

00558332

Top View

ADC0831 Single Differential Input

Small Outline Package (WM)

00558342

Top View

ADC0838 8-Channel MUX

Molded Chip Carrier (PCC) Package (V)

00558333

ADC0831/ADC0832/ADC0834/ADC0838

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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

ADC0831/ADC0832/ADC0834/ADC0838

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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 VDCto 6.3 V

DC

Temperature Range T

MIN≤TA≤TMAX

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

≤ VCC+0.1V, TA=Tj= 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 VCC+0.05 VCC+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 VCC=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)

ADC0831/ADC0832/ADC0834/ADC0838

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Converter and Multiplexer Electrical Characteristics The following specifications apply for

V

CC

=V+=V

REF

= 5V, V

REF

≤ VCC+0.1V, TA=Tj= 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

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

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 VCC=5.25V 2.0 2.0 2.0 V

Voltage (Min)

V

IN(0)

, Logical “0” Input VCC=4.75V 0.8 0.8 0.8 V

Voltage (Max)

I

IN(1)

, Logical “1” Input VIN=5.0V 0.005 1 0.005 1 1 µA

Current (Max)

I

IN(0)

, Logical “0” Input VIN=0V −0.005 −1 −0.005 −1 −1 µA

Current (Max)

V

OUT(1)

, Logical “1” Output VCC=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 VCC=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=VCC

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

ADC0831/ADC0832/ADC0834/ADC0838

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AC Characteristics

The following specifications apply for VCC= 5V, tr=tf= 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

t

pd1,tpd0

— CLK Falling CL=100 pF

Edge to Output Data Valid Data MSB First 650 1500 ns

(Note 11) Data LSB First 250 600 ns

t

1H,t0H

, — Rising Edge of CL=10 pF, RL=10k 125 250 ns

CS to Data Output and (see TRI-STATE

®

Test Circuits)

SARS Hi– Z C

L

=100 pf, RL=2k 500 ns

C

IN

, Capacitance of Logic 5 pF

Input

C

OUT

, Capacitance of Logic 5 pF

Outputs

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. DC and AC electrical specifications do not apply when operating
the device beyond its specified operating conditions.

Note 2: All voltages are measured with respect to the ground plugs.

Note 3: Internal zener diodes (6.3 to 8.5V) are connected from V+ to GND and V

CC

to GND. The zener at V+ can operate as a shunt regulator and is connected

to V

CC

via a conventional diode. Since the zener voltage equals the A/D’s breakdown voltage, the diode insures that VCCwill be below breakdown when the device

is powered from V+. Functionality is therefore guaranteed for V+ operation even though the resultant voltage at V

CC

may exceed the specified Absolute Max of 6.5V.

It is recommended that a resistor be used to limit the max current into V+. (See Figure 3 in Functional Description Section 6.0)

Note 4: When the input voltage (V

IN

) at any pin exceeds the power supply rails (V

IN

<

V−or V

IN

>

V+) the absolute value of current at that pin should be limited

to 5 mA or less. The 20 mA package input current limits the number of pins that can exceed the power supply boundaries witha5mAcurrent limit to four.

Note 5: Human body model, 100 pF discharged through a 1.5 kΩ resistor.

Note 6: Total unadjusted error includes offset, full-scale, linearity, and multiplexer errors.

Note 7: Cannot be tested for ADC0832.

Note 8: For V

IN

(−)≥VIN(+) the digital output code will be 0000 0000. Two on-chip diodes are tied to each analog input (see Block Diagram) which will forward conduct

for analog input voltages one diode drop below ground or one diode drop greater than the V

CC

supply. Be careful, during testing at low VCClevels (4.5V), as high
level analog inputs (5V) can cause this input diode to conduct — especially at elevated temperatures, and cause errors for analog inputs near full-scale. The spec
allows 50 mV forward bias of either diode. This means that as long as the analog V

IN

or V

REF

does not exceed the supply voltage by more than 50 mV, the output

code will be correct. To achieve an absolute 0 V

DC

to5VDCinput voltage range will therefore require a minimum supply voltage of 4.950 VDCover temperature

variations, initial tolerance and loading.

Note 9: Leakage current is measured with the clock not switching.

Note 10: A 40% to 60% clock duty cycle range insures proper operation at all clock frequencies. In the case that an available clock has a duty cycle outside of these

limits, the minimum, time the clock is high or the minimum time the clock is low must be at least 1 µs. The maximum time the clock can be high is 60 µs. The clock
can be stopped when low so long as the analog input voltage remains stable.

Note 11: Since data, MSB first, is the output of the comparator used in the successive approximation loop, an additional delay is built in (see Block Diagram) to allow
for comparator response time.

Note 12: Typicals are at 25˚C and represent most likely parametric norm.

Note 13: Tested limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).

Note 14: Guaranteed but not 100% production tested. These limits are not used to calculate outgoing quality levels.

ADC0831/ADC0832/ADC0834/ADC0838

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Typical Performance Characteristics

Unadjusted Offset Error vs. V

REF

Voltage

Linearity Error vs. V

REF

Voltage

00558343

00558344

Linearity Error vs. Temperature Linearity Error vs. f

CLK

00558345

00558346

Power Supply Current vs. Temperature (ADC0838,

ADC0831, ADC0834) Output Current vs. Temperature

00558347

Note: For ADC0832 add I

REF

.

00558348

ADC0831/ADC0832/ADC0834/ADC0838

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Typical Performance Characteristics (Continued)

Power Supply Current vs. f

CLK

00558329

Leakage Current Test Circuit

00558303

TRI-STATE Test Circuits and
Waveforms

t

1H

00558349

t

0H

00558350

t

1H

00558351

t

0H

00558352

ADC0831/ADC0832/ADC0834/ADC0838

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Timing Diagrams

Data Input Timing Data Output Timing

00558324

00558325

ADC0831 Start Conversion Timing

00558326

ADC0831 Timing

00558327

*LSB first output not available on ADC0831.

ADC0831/ADC0832/ADC0834/ADC0838

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Timing Diagrams (Continued)

ADC0832 Timing

00558328

ADC0834 Timing

00558305

ADC0831/ADC0832/ADC0834/ADC0838

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