Rainbow Electronics ADC1038 User Manual

ADC1031/ADC1034/ADC1038 10-Bit Serial
I/O A/D Converters with Analog Multiplexer
and Track/Hold Function

General Description

The ADC1031, ADC1034 and ADC1038 are 10-bit succes­sive approximation A/D converters with serial I/O. The seri­al input, for the ADC1034 and ADC1038, controls a single­ended analog multiplexer that selects one of 4 input chan­nels (ADC1034) or one of 8 input channels (ADC1038). The
ADC1034 and ADC1038 serial output data can be config­ured into a left- or right-justified format.

An input track/hold is implemented by a capacitive refer­ence ladder and sampled-data comparator. This allows the
analog input to vary during the A/D conversion cycle.

Separate serial I/O and conversion clock inputs are provid­ed to facilitate the interface to various microprocessors.

Applications

Y

Engine control

Y

Process control

Y

Instrumentation

Y

Test equipment

TRI-STATEÉis a registered trademark of National Semiconductor Corporation.

TM

MICROWIRE

is a trademark of National Semiconductor Corporation.

Features

Y

Serial I/O (MICROWIRETMcompatible)

Y

Separate asynchronous converter clock and serial data
I/O clock

Y

Analog input track/hold function

Y

Ratiometric or absolute voltage referencing

Y

No zero or full scale adjustment required

Y

0V to 5V analog input range with single 5V power
supply

Y

TTL/MOS input/output compatible

Y

No missing codes

Key Specifications

Y

Resolution 10 bits

Y

Total unadjusted error

Y

Single supply 5Vg5%

Y

Power dissipation 20 mW (max)

Y

Max. conversion time (f

Y

Serial data exchange time (f

C

January 1995

g

1 LSB (max)

e

3 MHz) 13.7 ms (max)

e

1 MHz) 10 ms (max)

S

ADC1031/ADC1034/ADC1038 10-Bit Serial I/O A/D Converters

with Analog Multiplexer and Track/Hold Function

Connection Diagrams

Dual-In-Line and SO Packages

Top View

ADC1031 In NS Package N08E

Ordering Information

C

1995 National Semiconductor Corporation RRD-B30M75/Printed in U. S. A.

TL/H/10556– 4

Top View

ADC1034 In NS Packages

J16A, M16B or N16E

s

Industrialb40§CsT

a

85§C Package

A

ADC1031CIN N08E

ADC1034CIN N16E

ADC1034CIWM M16B

ADC1038CIN N20A

ADC1038CIWM M20B

s

Militaryb55§CsT

a

125§C Package

A

ADC1034CMJ J16A

ADC1038CMJ J20A

TL/H/10556

TL/H/10556– 3

TL/H/10556– 2

Top View

ADC1038 In NS Packages

J20A, M20B or N20A

Absolute Maximum Ratings (Notes1&3)

If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.

Supply Voltage (V

Voltage at Inputs and Outputs

Input Current at Any Pin (Note 4)

Package Input Current (Note 4)

Package Dissipation

e

at T

A

ESD Susceptability (Note 6) 2000V

Soldering Information

N Package (10 sec.) 260
J Package (10 sec.) 300
SO Package (Note 7):

Vapor Phase (60 sec.) 215
Infrared (15 sec.) 220

Storage Temperature

) 6.5V

CC

b

0.3V to V

CC

a

g

g

20 mA

0.3V

5mA

25§C (Note 5) 500 mW

b

65§Ctoa150§C

§

§

§

§

Operating Ratings (Notes2&3)

Temperature Range T

ADC1031CIN,

ADC1034CIN,
ADC1034CIWM,
ADC1038CIN,
ADC1038CIWM

ADC1034CMJ, ADC1038CMJ

Supply Voltage (VCC) 4.75 VDCto 5.25 V

Reference Voltage

(V

REF

a

e

b

V

REF

V

REF

C
C

C
C

b

b

) 2.0 VDCto V

MIN

b

40§CsT

55§CsT

s

s

T

T

A

MAX

s

a

85§C

A

s

a

125§C

A

DC

a

0.05V

CC

Electrical Characteristics

The following specifications apply for V
specified. Boldface limits apply for T

ea

5.0V, V

CC

e

e

T

A

T

J

MIN

REF

to T

MAX

ea

4.6V, f

; all other limits T

Symbol Parameter Conditions

CONVERTER AND MULTIPLEXER CHARACTERISTICS

Total Unadjusted CIN, CIWM, CMJ (Note 10)
Error

Differential Linearity 10 Bits (min)

R

REF

V

REF

V

IN

Reference Input Resistance 8 kX

Reference Voltage (V

Analog Input Voltage (Note 11) (V

On Channel Leakage Current On Channele5VDC, 5.0 200 nA (max)

Off Channel

e

0V

DC

(Note 12) On Channele0VDC, 5.0

Off Channele5V

DC

Off Channel Leakage Current On Channele5VDC, 5.0

Off Channel

e

0V

DC

(Note 12) On Channele0VDC, 5.0 200 nA (max)

DC

e

5V

DC

s

s

V

CC

Off Channel

Power Supply Zero Error 4.75 V
Sensitivity

Full Scale Error

S

5.25 V

e

700 kHz, and f

e

A

T

J

e

3 MHz unless otherwise

C

e

25§C.

Typical Limit Units

(Note 8) (Note 9) (Limits)

g

11 kX (max)

a

CC

a

CC

b

(GND

500 nA (max)

b

b

500 nA (max)

b

b

500 nA (max)

500 nA (max)

g

DC

1/4 LSB (max)

g

1/4 LSB (max)

1 LSB (max)

5 kX (min)

0.05) V (max)

0.05) V (max)

0.05) V (min)

200 nA (max)

200 nA (max)

2

Electrical Characteristics (Continued)

The following specifications apply for V
specified. Boldface limits apply for T

ea

5.0V, V

CC

e

e

T

A

T

J

MIN

REF

to T

MAX

ea

4.6V, f

; all other limits T

S

Symbol Parameter Conditions

DIGITAL AND DC CHARACTERISTICS

V

IN(1)

V

IN(0)

I

IN(1)

I

IN(0)

V

OUT(1)

V

OUT(0)

I

OUT

I

SOURCE

I

SINK

I

CC

Logical ‘‘1’’ Input Voltage V

Logical ‘‘0’’ Input Voltage V

Logical ‘‘1’’ Input Current V

Logical ‘‘0’’ Input Current V

Logical ‘‘1’’ Output Voltage V

Logical ‘‘0’’ Output Voltage V

TRI-STATE Output Current V

Output Source Current V

Output Sink Current V

Supply Current CSeHIGH, V

e

5.25 V

I

OUT

V

CC

CC

IN

IN

CC

I

OUT

I

OUT

CC

OUT

OUT

OUT

OUT

e

e

DC

e

4.75 V

DC

5.0 V

DC

0V

DC

e

4.75 V

DC

eb

360 mA 2.4 V (min)

eb

10 mA 4.5 V (min)

e

4.75 V

DC

e

1.6 mA

e

0V

e

5V 0.01 3 mA (max)

e

0V

e

V

CC

Open 1.5 3 mA (max)

REF

AC CHARACTERISTICS

f

f

T

t

t

t

t1H,t0HDelay from OE or CS Rising R

t

t

Conversion Clock (C

C

Frequency 4.0 3.0 MHz (max)

Serial Data Clock (S

S

Frequency (Note 13) f

Conversion Time Not Including MUX Addressing and 41 (1/fC)

C

Analog Sampling Time After Address is Latched,CSeLow 4.5 (1/fS)

CA

Access Time Delay from CS or OE OEe‘‘0’’

ACC

Falling Edge to DO Data Valid

Set-up Time of CS Falling

SET-UP

Edge to S

Rising Edge

CLK

Edge to DO TRI-STATE

DI Hold Time from S

HDI

DI Set-up Time to S

SDI

) 0.7 MHz (min)

CLK

)f

CLK

e

3 MHz, R/Le‘‘0’’ 183 kHz (min)

C

e

3 MHz, R/Le‘‘1’’ 622 kHz (min)

C

e

f

3 MHz, R/Le‘‘0’’ or R/Le‘‘1’’ 2 1.0 MHz (max)

C

Analog Input Sampling Times

e

L

Rising Edge 0 50 ns (min)

CLK

Rising Edge 50 100 ns (min)

CLK

3kX,C

e

100 pF

L

e

700 kHz, and f

e

A

e

3 MHz unless otherwise

C

e

T

25§C.

J

Typical Limit Units

(Note 8) (Note 9) (Limits)

2.0 V (min)

0.8 V (max)

0.005 2.5 mA (max)

b

0.005b2.5 mA (max)

0.4 V (max)

b

0.01

b

14

b

b

16 8.0 mA (min)

a

200 ns

a

200 ns

100 200 ns (max)

75 150 ns (min)

100 120 ns (max)

3 mA (max)

6.5 mA (min)

(max)

(max)

3

Electrical Characteristics (Continued)

The following specifications apply for V
specified. Boldface limits apply for T

Symbol Parameter Conditions

ea

5.0V, V

CC

e

e

T

A

T

J

MIN

REF

to T

MAX

ea

4.6V, f

; all other limits T

S

e

700 kHz, and f

e

A

e

3 MHz unless otherwise

C

e

T

25§C.

J

Typical Limit Units

(Note 8) (Note 9) (Limits)

AC CHARACTERISTICS (Continued)

t

HDO

t

DDO

t

RDO

t

FDO

C

DO Hold Time from S

Delay from S
Edge to DO Data Valid

CLK

Falling Edge R

CLK

Falling R

DO Rise Time R

DO Fall Time R

IN

Input Capacitance Analog Inputs (CH0 – CH7) 50 pF

e

30 kX,C

L

e

30 kX,C

L

e

30 kX, TRI-STATE to High 35 75 ns (max)

L

e

C

100 pF

L

e

30 kX, TRI-STATE to Low 35 75 ns (max)

L

e

C

100 pF

L

e

100 pF 70 10 ns (min)

L

e

100 pF

L

150 250 ns (max)

Low to High 75 150 ns (max)

High to Low 75 150 ns (max)

All Other Inputs 7.5 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, but do not guarantee specific performance limits. For guaranteed specifications

and test conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. Some performance characteristics
may degrade when the device is not operated under the listed test conditions.

Note 3: All voltages are measured with respect to AGND and DGND, unless otherwise specified.

Note 4: When the input voltage (V

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
allowable power dissipation at any temperature is P
device, T
suffixes 52
46

Note 6: Human body model, 100 pF capacitor discharged through a 1.5 kX resistor.

Note 7: See AN450 ‘‘Surface Mounting Methods and Their Effect on Product Reliability’’ or

soldering surface mount devices.

Note 8: Typicals are at T

Note 9: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).

Note 10: Total unadjusted error includes offset, full-scale, linearity, multiplexer, and hold step errors.

Note 11: Two on-chip diodes are tied to each analog input. They will forward-conduct for analog input voltages one diode drop below ground or one diode drop

greater than V
elevated temperatures, which will 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
reading of a selected channel. To achieve an absolute 0 V
temperature variations, initial tolerance and loading.

Note 12: Channel leakage current is measured after the channel selection.

Note 13: In order to synchronize the serial data exchange properly, SARS needs to go low after completion of the serial I/O data exchange. If this does not occur

the output shift register will be reset and the correct output data lost. The minimum limit for S
justified, and can be determined by the following equations:

e

125§C. The typical thermal resistance (iJA) of these parts when board mounted follow: ADC1031 with CIN suffixes 71§C/W, ADC1034 with CMJ

Jmax

C/W, ADC1034 with CIN suffixes 54§C/W, ADC1034 with CIWM suffixes 70§C/W, ADC1038 with CMJ suffixes 53§C/W, ADC1038 with CIN suffixes

§

C/W, ADC1038 with CIWM suffixes 64§C/W.

§

supply. Be careful during testing at low VCClevels (4.5V), as high level analog inputs (5V) can cause an input diode to conduct, especially at

CC

does not exceed the supply voltage by more than 50 mV, the output code will be correct. Exceeding this range on an unselected channel will corrupt the

IN

) at any pin exceeds the power supplies (V

IN

e

b

(T

D

Jmax

e

25§C and represent most likely parametric norm.

J

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

DC

l

(8.5/41) (fC) with right-justification (R/Le‘‘1’’) and f

f

S

TA)/iJAor the number given in the Absolute Maximum Ratings, whichever is lower. For this

k

IN

DGND, or V

l

S

l

VCC) the current at that pin should be limited to 5 mA. The

IN

, iJAand the ambient temperature, TA. The maximum

Jmax

Linear Databook

will depend on C

CLK

(2.5/41) (fC) with left-justification (R/Le‘‘0’’).

section ‘‘Surface Mount’’ for other methods of

frequency and whether right-justified or left-

CLK

4

Typical Performance Characteristics

Power Supply Current
(ICC)vsC

CLK

Linearity Error vs

Frequency

C

CLK

Power Supply Current (ICC)
vs Ambient Temperature

Linearity Error vs
Ambient Temperature

Zero Error vs
Reference Voltage

Reference Current (I
vs Ambient Temperature

REF

Linearity Error vs
Reference Voltage

)

TL/H/10556– 5

5

Test Circuits

t1H,t

0H

Timing Diagrams

DO High to Low State

DI Data Input Timing

TL/H/10556– 6

TL/H/10556– 9

DO except ‘‘TRI-STATE’’

TL/H/10556– 7

DO Low to High State

TL/H/10556– 10

DO Data Output Timing

Leakage Current

TL/H/10556– 8

DO ‘‘TRI-STATE’’ Rise

and Fall Times

TL/H/10556– 11

TL/H/10556– 12

TL/H/10556– 13

6