Burr Brown Corporation ADS774KE, ADS774JU, ADS774JP, ADS774JE, ADS774KU Datasheet

®

ADS774

ADS774

ADS774

ADS774

Microprocessor-Compatible Sampling

CMOS ANALOG-to-DIGITAL CONVERTER

FEATURES

● REPLACES ADC574, ADC674 AND ADC774

FOR NEW DESIGNS

● COMPLETE SAMPLING A/D WITH

REFERENCE, CLOCK AND
MICROPROCESSOR INTERFACE

● FAST ACQUISITION AND CONVERSION:

8.5

µs max OVER TEMPERATURE

● ELIMINATES EXTERNAL SAMPLE/HOLD

IN MOST APPLICATIONS

● GUARANTEED AC AND DC PERFOR-

MANCE

● SINGLE +5V SUPPLY OPERATION

● LOW POWER: 120mW max

● PACKAGE OPTIONS: 0.6" and 0.3" DIPs,

SOIC

DESCRIPTION

The ADS774 is a 12-bit successive approximation
analog-to-digital converter using an innovative
capacitor array (CDAC) implemented in low-power
CMOS technology. This is a drop-in replacement for
ADC574, ADC674, and ADC774 models in most
applications, with internal sampling, much lower power
consumption, and the ability to operate from a single
+5V supply.

The ADS774 is complete with internal clock, micro­processor interface, three-state outputs, and internal
scaling resistors for input ranges of 0V to +10V, 0V to
+20V, ±5V, or ±10V. The maximum throughput time
is 8.5µs over the full operating temperature range,
including both acquisition and conversion.

Complete user control over the internal sampling func­tion facilitates elimination of external sample/hold
amplifiers in most existing designs.

The ADS774 requires +5V, with –15V optional. No
+15V supply is required. Available packages include

0.3" or 0.6" wide 28-pin plastic DIP and 28-pin SOICs.

Control
Inputs

Bipolar Offset

20V Range
10V Range

2.5V Reference
Input

2.5V Reference
Output

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

Internet: http://www.burr-brown.com/ • FAXLine: [phone] (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: [phone] • Immediate Product Info: [phone]

© 1991 Burr-Brown Corporation PDS-1109F Printed in U.S.A. July, 1995

CDAC

Control Logic

–
+

Comparator

Three-State Buffers

Clock

Successive

Approximation

Register

2.5V

Reference

Status

Parallel
Data
Output

SPECIFICATIONS

ELECTRICAL

At TA = T

PARAMETER MIN TYP MAX MIN TYP MAX UNITS
RESOLUTION 12 ✻ Bits

INPUTS
ANALOG

Voltage Ranges: Unipolar 0 to +10, 0 to +20 V

Impedance: 0 to +10V, ±5V 8.5 12 ✻✻ kΩ

DIGITAL (CE, CS, R/C, A

Voltages: Logic 1 +2.0 +5.5 ✻✻V

Current –5 0.1 +5 ✻✻✻µA
Capacitance 5 ✻ pF

TRANSFER CHARACTERISTICS
DC ACCURACY

At +25°C

T

AC ACCURACY

Spurious Free Dynamic Range 73 78 76 ✻ dB

Total Harmonic Distortion –77 –72 ✻ –75 dB
Signal-to-Noise Ratio 69 72 71 ✻ dB
Signal-to-(Noise + Distortion) Ratio 68 71 70 ✻ dB
Intermodulation Distortion –75 ✻

(F

TEMPERATURE COEFFICIENTS

Unipolar Offset ±1 ✻ ppm/°C
Bipolar Offset ±2 ✻ ppm/°C
Full-Scale Calibration ±12 ✻ ppm/°C

POWER SUPPLY SENSITIVITY

Change in Full-Scale Calibration
+4.75V < VDD < +5.25V
Max Change ±1/2 ✻ LSB

CONVERSION TIME (Including Acquisition Time)
t

AQ

12-Bit Cycle, T

SAMPLING DYNAMICS

Sampling Rate at 25°C 125 ✻ kHz

Aperture Delay, t

With VEE = +5V 20 ✻ ns
With V
Aperture Uncertainty (Jitter)
With V

Settling time to 0.01% for 1.4 ✻ µs

to T

MIN

, VDD = +5V, VEE = –15V to +5V, sampling frequency of 117kHz, fIN = 10kHz; unless otherwise specified.

MAX

ADS774JE, JP, JU ADS774KE, KP, KU

Bipolar ±5, ±10 V

±10V, 0V to +20V 35 50 ✻✻ kΩ

, 12/8)

O

Logic 0 –0.5 +0.8 ✻✻V

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)

±0.25 ✻ % of FS

(2)

(adjustable to zero)

No Missing Codes Resolution 12 12 Bits

MIN

Linearity Error ±1 ±1/2 LSB

to T

MAX

(3)

Full-Scale Calibration Error ±0.47 ±0.37 % of FS
Unipolar Offset ±4 ±3 LSB
Bipolar Offset ±12 ±5 LSB
No Missing Codes Resolution 12 12 Bits

(4)

= 20kHz, F

IN1

= 23kHz)

IN2

(5)

(6)

+ tC at 25°C:
8-Bit Cycle 5.5 5.9 ✻✻µs
12-Bit Cycle 7.5 8 ✻✻µs

to T

MIN

T

to T

MIN

MAX

= 0V to –15V 1.6 ✻ µs

EE

= +5V 300 ✻ ps, rms

EE

With V

= 0V to –15V 10 ✻ ns, r ms

EE

: 8 8.5 ✻✻µs

MAX

117 ✻ kHz

AP

Full-Scale Input Change

®

ADS774 2

SPECIFICATIONS (CONT)

ELECTRICAL

At TA = T

PARAMETER MIN TYP MAX MIN TYP MAX UNITS
OUTPUTS

DIGITAL (DB

Output Codes: Unipolar Unipolar Straight Binary (USB)

Logic Levels: Logic 0 (I

Leakage, Data Bits Only, High-Z State –5 0.1 +5 ✻✻✻µA
Capacitance 5 ✻ pF

INTERNAL REFERENCE VOLTAGE

Voltage +2.4 +2.5 +2.6 ✻✻✻V
Source Current Available for External Loads 0.5 ✻ mA

POWER SUPPLY REQUIREMENTS

Voltage: V

Current: I
I
Power Dissipation (T
(V

TEMPERATURE RANGE

Specification 0 +70 ✻✻°C
Operating: –40 +85 ✻✻°C
Storage Temperature Range –65 +150 ✻✻°C

✻ Same specification as ADS774JE, JP, JU.
NOTES: (1) With fixed 50Ω resistor from REF OUT to REF IN. This parameter is also adjustable to zero at +25°C. (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. (3) Maximum error at T
+5V, which is the Control Mode. See the section "S/H Control Mode and ADC774 Emulation Mode." (5) Using internal reference. (6) This is worst case change
in accuracy from accuracy with a +5V supply. (7) V
typ; when V

to T

MIN

, VDD = +5V, VEE = –15V to +5V, sampling frequency of 117kHz, fIN = 10kHz; unless otherwise specified.

MAX

ADS774JE, JP, JU ADS774KE, KP, KU

- DB0, STATUS)

11

Bipolar Bipolar Offset Binary (BOB)

= 1.6mA) +0.4 ✻ V

SINK

Logic 1 (I

(7)

EE

V

DD

(7)

(VEE = –15V) –1 ✻ mA

EE
DD

= 0V to +5V) 75 120 ✻✻mW

EE

= 0V, IEE = ±5µA typ; when VEE = +5V, IEE = +167µA typ.

EE

= 500µA) +2.4 ✻ V

SOURCE

–16.5 V

+4.5 +5.5 ✻✻V

DD

✻✻V

+15 +24 ✻✻mA

to T

MAX

)

and T

MIN

MAX

is optional, and is only used to set the mode for the internal sample/hold. When VEE = –15V, IEE = –1mA

EE

MIN

. (4) Based on using VEE =

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.

ADS7743

®

ABSOLUTE MAXIMUM RATINGS

VEE to Digital Common....................................................... +VDD to –16.5V

V

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

DD

Analog Common to Digital Common.................................................... ±1V

Control Inputs (CE, CS, A

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

Analog Inputs (Ref In, Bipolar Offset, 10V

to Analog Common ...................................................................... ±16.5V

20V

to Analog Common .................................................................. ±24V

IN

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

Max Junction Temperature ............................................................ +165°C

Power Dissipation ........................................................................ 1000mW

Lead Temperature (soldering,10s)................................................. +300°C

Thermal Resistance,

, 12/8, R/C)

O

)

IN

Momentary Short to V

θ

: Plastic DIPs ........................................100°C/W

JA

SOIC................................................... 100°C/W

DD

+0.5V

This integrated circuit can be damaged by ESD. Burr-Brown
recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling
and installation procedures can cause damage.

ESD damage can range from subtle performance degrada-

DD

tion to complete device failure. Precision integrated circuits
may be more susceptible to damage because very small
parametric changes could cause the device not to meet its
published specifications.

ELECTROSTATIC
DISCHARGE SENSITIVITY

PACKAGE/ORDERING INFORMATION

PRODUCT SINAD

ADS774JE 68dB 0°C to +70°C ±1LSB 28-Pin 0.3" Plastic DIP 246
ADS774KE 70dB 0°C to +70°C ±1/2LSB 28-Pin 0.3" Plastic DIP 246
ADS774JP 68dB 0°C to +70°C ±1LSB 28-Pin 0.6" Plastic DIP 215
ADS774KP 70dB 0°C to +70°C ±1/2LSB 28-Pin 0.6" Plastic DIP 215
ADS774JU 68dB 0°C to +70°C ±1LSB 28-Lead SOIC 217
ADS774KU 70dB 0°C to +70°C ±1/2LSB 28-Lead SOIC 217

NOTES: (1) SINAD is Signal-to-(Noise + Distortion) expressed in dB. (2) For detailed drawing and dimension table, please see end of data sheet, or Appendix C of Burr­Brown IC Data Book.

(1)

TEMPERATURE LINEARITY PACKAGE DRAWING

RANGE ERROR PACKAGE NUMBER

(2)

CONNECTION DIAGRAM

+5VDC Supply

(V )

DD

12/8

CS

A

R/C

CE

NC*

2.5V Ref
Out

Analog

Common

2.5V Ref
In

V

EE

Bipolar

Offset

10V Range

20V Range

1

–

2

Control

3

Logic

4

O

–

5

6

7

8

9

10

11

12

13

14

Reference

*Not Internally Connected

2.5V

Power-Up Reset

Clock

CDAC

12 Bits

28

STATUS

27

DB11 (MSB)

26

DB10

Nibble A

25

DB9

24

DB8

23

DB7

22

21

Nibble BNibble C

20

19

18

17

16

15

DB6

DB5

DB4

DB3

DB2

DB1

DB0 (LSB)

Digital
Common

12

Bits

Succesive Approximation Register

Three-State Buffers and Control

–
+

®

ADS774 4