ADC0831_ADC0832_ADC0834_ADC0838.pdf

July 2002

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

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.

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

Features

n NSC MICROWIRE compatible — direct interface to

COPS family processors

n Easy interface to all microprocessors, or operates

“stand-alone”

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.

DS005583

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Connection Diagrams

ADC0832 2-Channel MUX

Small Outline Package (WM)

ADC0838 8-Channel Mux

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

00558341

Top View

00558308

ADC0831 Single

Differential Input

Dual-In-Line Package (N)

Top View

ADC0834 4-Channel MUX

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

00558332

Top View

ADC0831 Single Differential Input

Small Outline Package (WM)

00558330

COM internally connected to A GND

Top View

ADC0832 2-Channel MUX

Dual-In-Line Package (N)

00558342

Top View

ADC0838 8-Channel MUX

Molded Chip Carrier (PCC) Package (V)

00558331

COM internally connected to GND.

V REF internally connected to V CC .

Top View

00558333

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Ordering Information

Part Number

Analog Input

Total

Package

Temperature

Channels

Unadjusted Error

Range

ADC0831CCN

± 1

Molded (N)

0˚C to +70˚C

ADC0831CCWM

SO(M)

0˚C to +70˚C

ADC0832CIWM

± 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

± 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

± 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

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Absolute Maximum Ratings (Notes 1,

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

Current into V + (Note 3)

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

15 mA

Supply Voltage, V CC (Note 3)

6.5V

Operating Ratings (Notes 1, 2)

Supply Voltage, V CC

Voltage

Logic Inputs

−0.3V to V CC +

0.3V

4.5 V DC to 6.3 V DC

Temperature Range

T MIN ≤

T A ≤

T MAX

ADC0832/8CIWM

−40˚C to +85˚C

Analog Inputs

−0.3V to V CC +

0.3V

ADC0834BCN,

ADC0838BCV,

ADC0831/2/4/8CCN,

ADC0838CCV,

ADC0831/2/4/8CCWM

Input Current per Pin (Note 4)

± 5mA

Package

± 20 mA

Storage Temperature

−65˚C to +150˚C

0˚C to +70˚C

Package Dissipation

at T A =25˚C (Board Mount)

0.8W

Lead Temperature (Soldering 10

sec.)

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

Conditions

CIWM Devices BCV, CCV, CCWM, BCN

and CCN Devices

Typ Tested Design Typ Tested Design Units

(Note 12) Limit Limit (Note 12) Limit

Parameter

Limit

(Note 13) (Note 14)

CONVERTER AND MULTIPLEXER CHARACTERISTICS

Total Unadjusted Error

V REF =5.00 V

ADC0838BCV

(Note 6)

± 1 ⁄ 2

ADC0834BCN

± 1 ⁄ 2

LSB

(Max)

ADC0838CCV

± 1

ADC0831/2/4/8CCN

± 1

ADC0831/2/4/8CCWM

± 1

ADC0832/8CIWM

± 1

Minimum Reference

3.5

1.3

3.5

1.3

Ω

Input Resistance (Note 7)

Maximum Reference

3.5

5.9

3.5

5.4

5.9

Ω

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

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)

LSB

V Z , internal

MIN 15 mA into V+

6.3

diode breakdown

MAX

8.5

(at V + ) (Note 3)

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apply from T MIN to T MAX .

Converter and Multiplexer Electrical Characteristics The following specifications apply for

V CC =V+=V REF = 5V, V REF ≤

Conditions

CIWM Devices BCV, CCV, CCWM, BCN

and CCN Devices

Typ Tested Design Typ Tested Design Units

(Note 12) Limit Limit (Note 12) Limit

Parameter

Limit

(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

LSB

I OFF , Off Channel Leakage

Channel=5V,

−0.2

−1

µA

Current (Note 9)

Off

Channel=0V

−1

Channel=0V,

+0.2

µA

Off

Channel=5V

I ON , On Channel Leakage

Channel=0V,

−0.2

−1

µA

Current (Note 9)

Off

Channel=5V

−1

Channel=5V,

+0.2

µA

Off

Channel=0V

DIGITAL AND DC CHARACTERISTICS

V IN(1) , Logical “1” Input

V CC =5.25V

2.0

Voltage (Min)

V IN(0) , Logical “0” Input

V CC =4.75V

0.8

Voltage (Max)

I IN(1) , Logical “1” Input

V IN =5.0V

0.005

µA

Current (Max)

I IN(0) , Logical “0” Input

V IN =0V

−0.005

−1

−0.005

−1

µA

Current (Max)

V OUT(1) , Logical “1” Output

V CC =4.75V

Voltage (Min)

I OUT =−360 µA

2.4

I OUT =−10 µA

4.5

V OUT(0) , Logical “0” Output

V CC =4.75V

0.4

Voltage (Max)

I OUT =1.6 mA

I OUT , TRI-STATE Output

V OUT =0V

−0.1

−3

−0.1

−3

µA

Current (Max)

V OUT =5V

0.1

µA

I SOURCE , Output Source

V OUT =0V

−14

−6.5

−14

−7.5

−6.5

Current (Min)

I SINK , Output Sink Current (Min)

V OUT =V CC

8.0

9.0

8.0

I CC , Supply Current (Max)

ADC0831, ADC0834,

0.9

2.5

0.9

2.5

ADC0838

ADC0832

Includes

Ladder

2.3

6.5

2.3

6.5

Current

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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)

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