NSC ADC0817CCN Datasheet

ADC0816/ADC0817
8-Bit µP Compatible A/D Converters
with 16-Channel Multiplexer

General Description

The ADC0816, ADC0817 data acquisition component is a
monolithic CMOS device with an 8-bit analog-to-digital con­verter, 16-channel multiplexer and microprocessor compat­ible control logic. The 8-bit A/D converter uses successive
approximation as the conversion technique. The converter
features a high impedance chopper stabilized comparator, a
256R voltage divider with analog switch tree and a succes­sive approximation register. The 16-channel multiplexer can
directly access any one of 16-single-ended analog signals,
and provides the logic for additional channel expansion. Sig­nal conditioning of any analog input signal is eased by direct
access to the multiplexer output, and to the input of the 8-bit
A/D converter.

The device eliminates the need for external zero and
full-scale adjustments. Easy interfacing to microprocessors
is provided by the latched and decoded multiplexer address
inputs and latched TTL TRI-STATE

®

outputs.

The design of the ADC0816, ADC0817 has been optimized
by incorporating the most desirable aspects of several A/D
conversion techniques. The ADC0816, ADC0817 offers high
speed, high accuracy, minimal temperaturedependence,ex­cellent long-term accuracy and repeatability, and consumes
minimal power. These features make this device ideally
suited to applications from process and machine control to
consumer and automotive applications. For similar perfor­mance in an 8-channel, 28-pin, 8-bit A/D converter, see the
ADC0808, ADC0809 data sheet. (See AN-258 for more in­formation.)

Features

n Easy interface to all microprocessors
n Operates ratiometrically or with 5 V

DC

or analog span

adjusted voltage reference

n 16-channel multiplexer with latched control logic
n Outputs meet TTL voltage level specifications
n 0V to 5V analog input voltage range with single 5V

supply

n No zero or full-scale adjust required
n Standard hermetic or molded 40-pin DIP package
n Temperature range −40˚C to +85˚C or −55˚C to +125˚C
n Latched TRI-STATE output
n Direct access to “comparator in” and “multiplexer out” for

signal conditioning

n ADC0816 equivalent to MM74C948
n ADC0817 equivalent to MM74C948-1

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 100 µs

Block Diagram

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

DS005277-1

June 1999

ADC0816/ADC0817 8-Bit µP Compatible A/D Converters with 16-Channel Multiplexer

© 1999 National Semiconductor Corporation DS005277 www.national.com

Connection Diagram

Ordering Information

TEMPERATURE RANGE −40˚C to +85˚C

Error

±

1

⁄2Bit Unadjusted ADC0816CCN ADC0816CCJ

±

1 Bit Unadjusted ADC0817CCN

Package Outline N40A Molded DIP J40A Hermetic DIP

Dual-In-Line Package

DS005277-6

Order Number ADC0816CCN or ADC0817CCN

See NS Package Number N40A

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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.

Supply Voltage (V

CC

) (Note 3) 6.5V

Voltage at Any Pin −0.3V to (V

CC

+0.3V)

Except Control Inputs

Voltage at Control Inputs −0.3V to 15V

(START, OE, CLOCK, ALE, EXPANSION CONTROL,

ADD A, ADD B, ADD C, ADD D)
Storage Temperature Range −65˚C to + 150˚C
Package Dissipation at T

A

=

25˚C 875 mW

Lead Temp. (Soldering, 10 seconds)

Dual-In-Line Package (Plastic) 260˚C
Molded Chip Carrier Package

Vapor Phase (60 seconds) 215˚C
Infrared (15 seconds) 220˚C

ESD Susceptibility (Note 9) 400V

Operating Conditions (Notes 1, 2)

Temperature Range (Note 1) T

MIN≤TA≤TMAX

ADC0816CCN, ADC0817CCN −40˚C≤TA≤+85˚C

Range of V

CC

(Note 1) 4.5 VDCto 6.0 V

DC

Voltage at Any Pin 0V to V

CC

Except Control Inputs

Voltage at Control Inputs 0V to 15V

(START, OE, CLOCK, ALE, EXPANSION CONTROL,

ADD A, ADD B, ADD C, ADD D)

Electrical Characteristics

Converter Specifications: V

CC

=

5V

DC

=

V

REF(+),VREF(−)

=

GND, V

IN

=

V

COMPARATOR IN,TMIN≤TMAX

and f

CLK

=

640 kHz unless

otherwise stated.

Symbol Parameter Conditions Min Typ Max Units

ADC0816

Total Unadjusted Error 25˚C

±

1

⁄

2

LSB

(Note 5) T

MIN

to T

MAX

±

3

⁄

4

LSB

ADC0817

Total Unadjusted Error 0˚C to 70˚C

±

1 LSB

(Note 5) T

MIN

to T

MAX

±

11⁄

4

LSB
Input Resistance From Ref(+) to Ref(−) 1.0 4.5 kΩ
Analog Input Voltage Range (Note 4) V(+) or V(−) GND−0.10 V

CC

+0.10 V

DC

V

REF(+)

Voltage, Top of Ladder Measured at Ref(+) V

CC

VCC+0.1 V

Voltage, Center of Ladder VCC/2−0.1 VCC/2 VCC/2+0.1 V

V

REF(−)

Voltage, Bottom of Ladder Measured at Ref(−) −0.1 0 V
Comparator Input Current f

c

=

640 kHz, (Note 6) −2

±

0.5 2 µA

Electrical Characteristics

Digital Levels and DC Specifications: ADC0816CCN, ADC0817CCN— 4.75V≤VCC≤5.25V, −40˚C≤TA≤+85˚C unless other-

wise noted.

Symbol Parameter Conditions Min Typ Max Units

ANALOG MULTIPLEXER

R

ON

Analog Multiplexer ON (Any Selected Channel)
Resistance T

A

=

25˚C, R

L

=

10k 1.5 3 kΩ

T

A

=

85˚C 6 kΩ

T

A

=

125˚C 9 kΩ

∆R

ON

∆ON Resistance Between Any (Any Selected Channel) 75 Ω
2 Channels R

L

=

10k

I

OFF+

OFF Channel Leakage Current V

CC

=

5V, V

IN

=

5V,

T

A

=

25˚C 10 200 nA

T

MIN

to T

MAX

1.0 µA

I

OFF(−)

OFF Channel Leakage Current V

CC

=

5V, V

IN

=

0,

T

A

=

25˚C −200 nA

T

MIN

to T

Max

−1.0 µA

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Electrical Characteristics (Continued)

Digital Levels and DC Specifications: ADC0816CCN, ADC0817CCN— 4.75V≤VCC≤5.25V, −40˚C≤TA≤+85˚C unless other-

wise noted.

Symbol Parameter Conditions Min Typ Max Units

CONTROL INPUTS

V

IN(1)

Logical “1” Input Voltage VCC−1.5 V

V

IN(0)

Logical “0” Input Voltage 1.5 V

I

IN(1)

Logical “1” Input Current V

IN

=

15V 1.0 µA

(The Control Inputs)

I

IN(0)

Logical “0” Input Current V

IN

=

0 −1.0 µA

(The Control Inputs)

I

CC

Supply Current f

CLK

=

640 kHz 0.3 3.0 mA

DATA OUTPUTS AND EOC (INTERRUPT)

V

OUT(1)

Logical “1” Output Voltage I

O

=

−360 µA, T

A

=

85˚C V

CC

−0.4 V

I

O

=

−300 µA, T

A

=

125˚C

V

OUT(0)

Logical “0” Output Voltage I

O

=

1.6 mA 0.45 V

V

OUT(0)

Logical “0” Output Voltage EOC I

O

=

1.2 mA 0.45 V

I

OUT

TRI-STATE Output Current V

O

=

V

CC

3.0 µA

V

O

=

0 −3.0 µA

Electrical Characteristics

Timing Specifications: V

CC

=

V

REF(+)

=

5V, V

REF(−)

=

GND, t

r

=

t

f

=

20 ns and T

A

=

25˚C unless otherwise noted.

Symbol Parameter Conditions Min Typ Max Units

t

WS

Minimum Start Pulse Width (

Figure 5

) (Note 7) 100 200 ns

t

WALE

Minimum ALE Pulse Width (

Figure 5

) 100 200 ns

t

s

Minimum Address Set-Up Time (

Figure 5

)2550ns

T

H

Minimum Address Hold Time (

Figure 5

)2550ns

t

D

Analog MUX Delay Time R

S

=

OΩ (

Figure 5

) 1 2.5 µs

from ALE

t

H1,tH0

OE Control to Q Logic State C

L

=

50 pF, R

L

=

10k (

Figure 8

) 125 250 ns

t

1H,t0H

OE Control to Hi-Z C

L

=

10 pF, R

L

=

10k (

Figure 8

) 125 250 ns

t

C

Conversion Time f

c

=

640 kHz, (

Figure 5

) (Note 8) 90 100 116 µs

f

c

Clock Frequency 10 640 1280 kHz

t

EOC

EOC Delay Time (

Figure 5

) 0 8+2µs Clock

Periods

C

IN

Input Capacitance At Control Inputs 10 15 pF

C

OUT

TRI-STATE Output At TRI-STATE Outputs (Note 8) 10 15 pF
Capacitance

Note 1: AbsoluteMaximum 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 GND, unless otherwise specified.
Note 3: Azener diode exists, internally, from V

CC

to GND and has a typical breakdown voltage of 7 VDC.

Note 4: Two on-chip diodes are tied to each analog input which will forward conduct for analog input voltages one diode drop below ground or one diode drop greater
than the V

CC

supply.The spec allows 100 mV forward bias of either diode. This means that as long as the analog VINdoes not exceed the supply voltage by more

than 100 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 4.900

V

DC

over temperature variations, initial tolerance and loading.

Note 5: Total unadjusted error includes offset, full-scale, and linearity errors. See

Figure 3

. None of these A/Ds requires a zero or full-scale adjust. However, if an
all zero code is desired for an analog input other than 0.0V, or if a narrow full-scale span exists (for example: 0.5V to 4.5V full-scale) the reference voltages can be
adjusted to achieve this. See

Figure 13

.

Note 6: Comparatorinput current is a bias current into or out of the chopper stabilized comparator.The bias current varies directly with clock frequency and has little
temperature dependence (

Figure 6

). See paragraph 4.0.

Note 7: Ifstart pulse is asynchronous with converter clock or if f

c

>

640 kHz, the minimum start pulse width is 8 clock periods plus 2 µs. For synchronous operation

at f

c

≤ 640 kHz take start high within 100 ns of clock going low.

Note 8: The outputs of the data register are updated one clock cycle before the rising edge of EOC.
Note 9: Human body model, 100 pF discharged through a 1.5 kΩ resistor.

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