Burr Brown Corporation ADC574ATH-BI, ADC574ATH, ADC574ASH-BI, ADC574ASH, ADC574AKP-BI Datasheet

®

ADC574A

FPO

Microprocessor-Compatible

ANALOG-TO-DIGITAL CONVERTER

FEATURES

● COMPLETE 12-BIT A/D CONVERTER WITH

REFERENCE, CLOCK, AND 8-, 12-, or 16­BIT MICROPROCESSOR BUS INTERFACE

● IMPROVED PERFORMANCE SECOND

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

µs max

Bus Access Time: 150ns max
A

O

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 per­formance. It is complete with a self-contained +10V
reference, internal clock, digital interface for micropro­cessor control, and three-state outputs.

The reference circuit, containing a buried zener, is laser­trimmed for minimum temperature coefficient. The
clock oscillator is current-controlled for excellent sta­bility 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 pro­vide 8- or 12-bit resolution. The conversion time for 12
bits is factory set for 25µs maximum.

Output data are available in a parallel format from TTL­compatible 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 • Mailing Address: PO Box 11400 • Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd. • Tucson, AZ 85706

Tel: [phone] • Twx: 910-952-1111 • Cable: BBRCORP • Telex: 066-6491 • FAX: [phone] • Immediate Product Info: [phone]

Successive

Approximation

Register

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

© 1984 Burr-Brown Corporation PDS-550G Printed in U.S.A., August, 1993

2

®

ADC574A

SPECIFICATIONS

ELECTRICAL

At TA = +25°C, VCC = +12V or +15V, VEE = –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 12 * Bits

INPUTS
ANALOG

Voltage Ranges: Unipolar 0 to +10, 0 to +20 * V
Bipolar ±5, ±10 * V
Impedance: 0 to +10V, ±5V 4.7 5 5.3 * * * kΩ

±10V, 0V to +20V 9.4 10 10.6 * * * kΩ

DIGITAL (CE, CS, R/C, A

O

, 12/8)
Over Temperature Range
Voltages: Logic 1 +2 +5.5 * * V
Logic 0 –0.5 +0.8 * * V
Current –5 0.1 +5 * * * µA
Capacitance 5 * pF

TRANSFER CHARACTERISTICS
ACCURACY

At +25°C

Linearity Error ±1 ±1/2 LSB
Unipolar Offset Error (Adjustable to Zero) ±2 * LSB
Bipolar Offset Error (Adjustable to Zero) ±10 ±4 LSB
Full-Scale Calibration Error

(1)

(Adjustable to Zero) ±0.25 * % of FS

(2)

No Missing Codes Resolution (Diff. Linearity) 11 12 Bits
Inherent Quantization Error ±1/2 * LSB

T

MIN

to T

MAX

Linearity Error: J, K Grades ±1 ±1/2 LSB

S, T Grades ±1 ±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) 11 12 Bits

TEMPERATURE COEFFICIENTS (T

MIN

to T

MAX

)

(3)

Unipolar Offset: J, K Grades ±10 ±5 ppm/°C

S, T Grades ±5 ±2.5 ppm/°C

Max Change: All Grades ±2 ±1 LSB

Bipolar Offset: All Grades ±10 ±5 ppm/°C

Max Change: J, K Grades ±2 ±1 LSB

S, T Grades ±4 ±2 LSB

Full-Scale Calibration: J, K Grades ±45 ±25 ppm/°C

S, T Grades ±50 ±25 ppm/°C

Max Change: J, K Grades ±9 ±5 LSB

S, T Grades ±20 ±10 LSB

POWER SUPPLY SENSITIVITY

Change in Full-Scale Calibration

+13.5V < VCC < +16.5V or +11.4V < VCC < + 12.6V

±2 ±1 LSB

–16.5V < VEE < –13.5V or –12.6V < VEE < – 11.4V

±2 ±1 LSB

+4.5V < V

LOGIC

< +5.5V ±1/2 * LSB

CONVERSION TIME

(4)

8-Bit Cycle 10 13 17 * * * µ s
12-Bit Cycle 15 20 25 * • • µs

OUTPUTS
DIGITAL (DB

11

–DB0, 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 * V

Logic 1 (I

SOURCE

= 500µA) +2.4 * V
Leakage, Data Bits Only, High -Z State –5 0.1 +5 * * * µA
Capacitance 5 * pF

3

®

ADC574A

SPECIFICATIONS (CONT)

ELECTRICAL

At TA = +25°C, VCC = +12V or +15V, VEE = –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 50Ω resistor from REF OUT to REF IN. This parameter is also adjustable to zero at ±25°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

CS

A

R/C

CE

+V

Ref Out

Analog Common

Ref In

V

Bipolar Offset

10V Range
20V Range

Status
DB11 (MSB)
DB10
DB9
DB8
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0 (LSB)
Digital Common

1
2
3
4
5
6
7
8

9
10
11
12
13
14

28
27
26
25
24
23
22
21
20
19
18
17
16
15

LOGIC

CC

EE

5kΩ

10kΩ

10V

Reference

12-Bit

D/A

Converter

Successive Approximation Register

Control

Logic

Power-up Reset

Clock

12 Bits

Comparator

12 Bits

Nibble ANibble BNibble C

Three-State Buffers and Control

O

5k

Ω

INTERNAL REFERENCE VOLTAGE

Voltage +9.9 +10.0 +10.1 * * * V
Source Current Available for External Loads

(5)

2.0 * mA

POWER SUPPLY REQUIREMENTS

Voltage: V

CC

+11.4 +16.5 * * V

V

EE

–11.4 –16.5 * * V

V

LOGIC

+4.5 +5.5 * * V

Current: I

CC

3.5 5 * * mA

I

EE

15 20 * * mA

I

LOGIC

915 * *mA

Power Dissipation (±15V Supplies) 325 450 * * mW
TEMPERATURE RANGE (Ambient: T

MIN

, T

MAX

)

Specifications: J, K Grades 0 +75 * * °C

S, T Grades –55 +125 * * °C

Storage –65 +150 * * °C