ADC574A

FPO

Microprocessor-Compatible

ANALOG-TO-DIGITAL CONVERTER

FEATURES

COMPLETE 12-BIT A/D CONVERTER WITH
REFERENCE, CLOCK, AND 8-, 12-, or 16-
BIT MICROPROCESSOR BUS INTERFACE

IMPROVED PERFORMANCE SECOND
SOURCE FOR 574A-TYPE A/D
CONVERTERS
Conversion Time: 25

s max

Bus Access Time: 150ns max
A

Input: Bus Contention During Read

Operation Eliminated

DUAL IN-LINE PLASTIC, PLCC AND
HERMETIC CERAMIC

FULLY SPECIFIED FOR OPERATION ON

12V OR

15V SUPPLIES

NO MISSING CODES OVER
TEMPERATURE:
0

C to +75

C: ADC574AJ and K Grades

55

C to +125

C: ADC574ASH, TH

DESCRIPTION

The ADC574A is a 12-bit successive approximation
analog-to-digital converter, utilizing state-of-the-art
CMOS and laser-trimmed bipolar die custom-designed

for freedom from latch-up and for optimum AC per-
formance. It is complete with a self-contained +10V
reference, internal clock, digital interface for micropro-
cessor control, and three-state outputs.

The reference circuit, containing a buried zener, is laser-
trimmed for minimum temperature coefficient. The
clock oscillator is current-controlled for excellent sta-
bility over temperature. Full-scale and offset errors may
be externally trimmed to zero. Internal scaling resistors
are provided for the selection of analog input signal
ranges of 0V to +10V, 0V to +20V,

5V, and

10V.

The converter may be externally programmed to pro-
vide 8- or 12-bit resolution. The conversion time for 12
bits is factory set for 25

s maximum.

Output data are available in a parallel format from TTL-
compatible three-state output buffers. Output data are
coded in straight binary for unipolar input signals and
bipolar offset binary for bipolar input signals.

The ADC574A, available in both industrial and military
temperature ranges, requires supply voltages of +5V
and

12V or

15V. It is packaged in a 28-pin plastic

DIP, and a hermetic side-brazed ceramic DIP.

International Airport Industrial Park ˇ Mailing Address: PO Box 11400 ˇ Tucson, AZ 85734 ˇ Street Address: 6730 S. Tucson Blvd. ˇ Tucson, AZ 85706

Tel: (520) 746-1111 ˇ Twx: 910-952-1111 ˇ Cable: BBRCORP ˇ Telex: 066-6491 ˇ FAX: (520) 889-1510 ˇ Immediate Product Info: (800) 548-6132

Successive

Approximation

Control Logic

Comparator

12-Bit D/A

Converter

10V

Control
Inputs

Bipolar
Offset

20V Range

10V Range

Reference
Input

Reference
Output

Three-State Buffers

Status

Parallel
Data
Output

Clock

Reference

Š 1984 Burr-Brown Corporation

PDS-550G

Printed in U.S.A., August, 1993

ADC574A

SPECIFICATIONS

ELECTRICAL

At T

= +25

C, V

= +12V or +15V, V

= 12V or 15V, and V

LOGIC

= +5V unless otherwise specified.

ADC574AJP, JH, SH

ADC574AKP, KH, TH

PARAMETER

MIN

TYP

MAX

MIN

TYP

MAX

UNITS

RESOLUTION

Bits

INPUTS

ANALOG
Voltage Ranges: Unipolar

0 to +10, 0 to +20

Bipolar

Impedance: 0 to +10V,

4.7

5.3

10V, 0V to +20V

9.4

10.6

DIGITAL (CE, CS, R/C, A

, 12/8)

Over Temperature Range
Voltages: Logic 1

+5.5

Logic 0

0.5

+0.8

Current

0.1

Capacitance

TRANSFER CHARACTERISTICS

ACCURACY
At +25

Linearity Error

1/2

LSB

Unipolar Offset Error (Adjustable to Zero)

LSB

Bipolar Offset Error (Adjustable to Zero)

LSB

Full-Scale Calibration Error

(1)

(Adjustable to Zero)

0.25

% of FS

(2)

No Missing Codes Resolution (Diff. Linearity)

Bits

Inherent Quantization Error

1/2

LSB

MIN

to T

MAX

Linearity Error: J, K Grades

1/2

LSB

S, T Grades

3/4

LSB

Full-Scale Calibration Error

Without Initial Adjustment

(1)

: J, K Grades

0.47

0.37

% of FS

S, T Grades

0.75

0.5

% of FS

Adjusted to Zero at +25

C: J, K Grades

0.22

0.12

% of FS

S, T Grades

0.5

0.25

% of FS

No Missing Codes Resolution (Diff. Linearity)

Bits

TEMPERATURE COEFFICIENTS (T

MIN

to T

MAX

)

(3)

Unipolar Offset: J, K Grades

ppm/

S, T Grades

2.5

ppm/

Max Change: All Grades

LSB

Bipolar Offset: All Grades

ppm/

Max Change: J, K Grades

LSB

S, T Grades

LSB

Full-Scale Calibration: J, K Grades

ppm/

S, T Grades

ppm/

Max Change: J, K Grades

LSB

S, T Grades

LSB

POWER SUPPLY SENSITIVITY
Change in Full-Scale Calibration
+13.5V < V

< +16.5V or +11.4V < V

< + 12.6V

LSB

16.5V < V

< 13.5V or 12.6V < V

< 11.4V

LSB

+4.5V < V

LOGIC

< +5.5V

1/2

LSB

CONVERSION TIME

(4)

8-Bit Cycle

12-Bit Cycle

OUTPUTS

DIGITAL (DB

, STATUS)

(Over Temperature Range)

Output Codes: Unipolar

Unipolar Straight Binary (USB)

Bipolar

Bipolar Offset Binary (BOB)

Logic Levels: Logic 0 (I

SINK

= 1.6mA)

+0.4

Logic 1 (I

SOURCE

= 500

+2.4

Leakage, Data Bits Only, High -Z State

0.1

Capacitance

ADC574A

SPECIFICATIONS

(CONT)

ELECTRICAL

At T

= +25

C, V

= +12V or +15V, V

= 12V or 15V, and V

LOGIC

= +5V unless otherwise specified.

ADC574AJP, JH, SH

ADC574AKP, KH, TH

PARAMETERS

MIN

TYP

MAX

MIN

TYP

MAX

UNITS

* Same specifications as ADC574AJP, AJH, ASH.
NOTES: (1) With fixed 50

resistor from REF OUT to REF IN. This parameter is also adjustable to zero at

C (see Optional External Full Scale and Offset

Adjustments section). (2) FS in this specification table means Full Scale Range. That is, for a

10V input range, FS means 20V; for a 0 to +10V range, FS means

10V. The term Full Scale for these specifications instead of Full-Scale Range is used to be consistent with other vendors' 574 and 574A type specifications tables.
(3) Using internal reference. (4) See Controlling the ADC574A section for detailed information concerning digital timing. (5) External loading must be constant during
conversion. The reference output requires no buffer amplifier with either

12V or

15V power supplies.

PIN CONFIGURATION

+5VDC Supply (V )

12/8

R/C

Ref Out

Analog Common

Ref In

Bipolar Offset

10V Range

20V Range

Status

DB11 (MSB)

DB10

DB9

DB8

DB7

DB6

DB5

DB4

DB3

DB2

DB1

DB0 (LSB)

Digital Common

LOGIC

10k

10V

Reference

12-Bit

D/A

Converter

Successive Approximation Register

Control

Logic

Power-up Reset

Clock

12 Bits

Comparator

12 Bits

Nibble A

Nibble B

Nibble C

Three-State Buffers and Control

INTERNAL REFERENCE VOLTAGE
Voltage

+9.9

+10.0

+10.1

Source Current Available for External Loads

(5)

2.0

POWER SUPPLY REQUIREMENTS

Voltage: V

+11.4

+16.5

11.4

16.5

LOGIC

+4.5

+5.5

Current: I

3.5

LOGIC

Power Dissipation (

15V Supplies)

325

450

TEMPERATURE RANGE (Ambient: T

MIN

, T

MAX

)

Specifications: J, K Grades

+75

S, T Grades

+125

Storage

+150

ADC574A

LINEARITY

TEMPERATURE

ERROR MAX

MODEL

PACKAGE

RANGE

MIN

TO T

MAX

)

ADC574AJP

Plastic DIP

C to +75

1LSB

ADC574AKP

Plastic DIP

C to +75

1/2LSB

ADC574AJH

Ceramic DIP

C to +75

1LSB

ADC574AKH

Ceramic DIP

C to +75

1/2LSB

ADC574ASH

Ceramic DIP

C to +125

1LSB

ADC574ATH

Ceramic DIP

C to +125

3/4LSB

BURN-IN SCREENING OPTION
See text for details.

ABSOLUTE MAXIMUM RATINGS

to Digital Common ......................................................... 0V to +16.5V

to Digital Common .......................................................... 0V to 16.5V

LOGIC

Digital Common .............................................................. 0V to +7V

Analog Common to Digital Common ....................................................

Control Inputs (CE, CS, A

, 12/8, R/C)

to Digital Common .............................................. 0.5V to V

LOGIC

+0.5V

Analog Inputs (Ref In, Bipolar Offset, 10V

)

to Analog Common ......................................................................

16.5V

20V

to Analog Common ..................................................................

24V

Ref Out .......................................................... Indefinite Short to Common,

Momentary Short to V

Max Junction Temperature ............................................................ +165

Power Dissipation ........................................................................ 1000mW
Lead Temperature (soldering,10s) ................................................. +300

Thermal Resistance,

: Ceramic ................................................ 50

C/W

Plastic ................................................. 100

C/W

CAUTION: These devices are sensitive to electrostatic discharge.
Appropriate I.C. handling procedures should be followed.

BURN-IN SCREENING

Burn-in screening is available for both plastic and ceramic
package ADC574s. Burn-in duration is 160 hours at the
temperature (or equivalent combination of time and tem-
perature) indicated below:

Plastic "BI" models: +85

Ceramic "BI" models: +125

All units are 100% electrically tested after burn-in is com-
pleted. To order burn-in, add "BI" to the base model
number (e.g., ADC574AKP-BI).

PACKAGE DRAWING

MODEL

PACKAGE

NUMBER

(1)

ADC574AJP

Plastic DIP

215

ADC574AKP

Plastic DIP

215

ADC574AJH

Ceramic DIP

149

ADC574AKH

Ceramic DIP

149

ADC574ASH

Ceramic DIP

149

ADC574ATH

Ceramic DIP

149

NOTE: (1) For detailed drawing and dimension table, please see end of data
sheet, or Appendix D of Burr-Brown IC Data Book.

ORDERING INFORMATION

TEMPERATURE

BURN-IN TEMP

MODEL

PACKAGE

RANGE

(160 Hours)

ADC574AJP-BI

Plastic DIP

C to +75

+85

ADC574AKP-BI

Plastic DIP

C to +75

+85

ADC574AJH-BI

Ceramic DIP

C to +75

+125

ADC574AKH-BI

Ceramic DIP

C to +75

+125

ADC574ASH-BI

Ceramic DIP

C to +125

+125

ADC574ATH-BI

Ceramic DIP

C to +125

+125

The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes
no responsibility for the use of this information, and all use of such information shall be entirely at the user's own risk. Prices and specifications are subject to change
without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant
any BURR-BROWN product for use in life support devices and/or systems.

PACKAGE INFORMATION

ADC574A

DISCUSSION OF
SPECIFICATIONS

LINEARITY ERROR

Linearity error is defined as the deviation of actual code
transition values from the ideal transition values. Ideal
transition values lie on a line drawn through zero (or minus
full scale for bipolar operation) and plus full scale. The zero
value is located at an analog input value 1/2LSB before the
first code transition (000

to 001

). The full-scale value is

located at an analog value 3/2LSB beyond the last code
transition (FFE

to FFF

) (see Figure 1).

FIGURE 1. ADC574A Transfer Characteristics Terminology.

out the range. Thus, every input code width (quantum) must
have a finite width. If an input quantum has a value of zero
(a differential linearity error of 1LSB), a missing code will
occur.

ADC574AKP, KN, KH and TH grades are guaranteed to
have no missing codes to 12-bit resolution over their re-
spective specification temperature ranges.

UNIPOLAR OFFSET ERROR

An ADC574A connected for unipolar operation has an
analog input range of 0V to plus full scale. The first output
code transition should occur at an analog input value 1/2
LSB above 0V. Unipolar offset error is defined as the
deviation of the actual transition value from the ideal value.
The unipolar offset temperature coefficient specifies the
change of this transition value versus a change in ambient
temperature.

BIPOLAR OFFSET ERROR

A/D converter specifications have historically defined bipo-
lar offset as the first transition value above the minus full-
scale value. The ADC574A specification, however, follows
the terminology defined for the 574 converter several years
ago. Thus, bipolar offset is located near the midscale value
of 0V (bipolar zero) at the output code transition 7FF

800

Bipolar offset error for the ADC574A is defined as the
deviation of the actual transition value from the ideal
transition value located 1/2LSB below 0V. The bipolar
offset temperature coefficient specifies the maximum change
of the code transition value versus a change in ambient
temperature.

FULL SCALE CALIBRATION ERROR

The last output transition (FFE

to FFF

) occurs for an

analog input value 3/2LSB below the nominal full-scale
value. The full-scale calibration error is the deviation of the
actual analog value at the last transition point from the ideal
value. The full-scale calibration temperature coefficient
specifies the maximum change of the code transition value
versus a change in ambient temperature.

POWER SUPPLY SENSITIVITY

Electrical specifications for the ADC574A assume the
application of the rated power supply voltages of +5V and

12V or

15V. The major effect of power supply voltage

BINARY (BIN) OUTPUT

INPUT VOLTAGE RANGE AND LSB VALUES

Analog Input Voltage Range

Defined as:

10V

0 to +10V

0 to +20V

One Least Significant Bit (LSB)

FSR

20V

10V

20V

n = 8

78.13mV

39.06mV

78.13mV

n =12

4.88mV

2.44mV

4.88mV

Output Transition Values
FFE

to FFF

+Full-Scale Calibration

+10V 3/2LSB

+5 3/2LSB

+10V 3/2LSB

7FF

to 800

Midscale Calibration (Bipolar Offset)

0 1/2LSB

+5V 1/2LSB

10V 1/2LSB

Full-Scale
Calibration
Error
Rotates
The
Line

Offset
Error
Shifts
The Line

(Bipolar

Offset

Transaction)

Midscale

(Bipolar

Zero)

FFF

FFE

FFD

802

801

800

7FF

7FE

001

000

002

Digital Output

1/2LSB

Zero

(Full Scale)

Zero
(Full-Scale
Calibration
Transition)

1/2LSB

3/2LSB
+Full-Scale
Calibration
Transition

+Full
Scale

Analog Input

TABLE I. Input Voltages, Transition Values, and LSB Values.

Thus, for a converter connected for biopolar operation and
with a full-scale range (or span) of 20V (

10V), the zero

value of 10V is 2.44mV below the first code transition
(000

to 001

at 9.99756V) and the plus full-scale value of

+10V is 7.32mV above the last code transition (FFE

FFF

at +9.99268) (see Table I).

NO MISSING CODES
(DIFFERENTIAL LINEARITY ERROR)

A specification which guarantees no missing codes requires
that every code combination to appear in a monotonically-
increasing sequence as the analog input is increased through-

Part Number ADC574A