Burr Brown Corporation ADS774KU-1K Datasheet

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

ADS774

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

Microprocessor-Compatible Sampling

CMOS ANALOG-to-DIGITAL CONVERTER

Comparator

2.5V Reference
Input

CDAC

10V Range

20V Range

Bipolar Offset

–
+

2.5V Reference
Output

Control
Inputs

2.5V

Reference

Clock

Successive

Approximation

Register

Control Logic

Three-State Buffers

Status

Parallel
Data
Output

®

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.

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ADS774

ADS774

ADS774

®

ADS774 2

SPECIFICATIONS

ELECTRICAL

At TA = T

MIN

to T

MAX

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

ADS774JE, JP, JU ADS774KE, KP, KU

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 8.5 12 ✻✻ kΩ

±10V, 0V to +20V 35 50 ✻✻ kΩ

DIGITAL (CE, CS, R/C, A

O

, 12/8)

Voltages: Logic 1 +2.0 +5.5 ✻✻V

Logic 0 –0.5 +0.8 ✻✻V
Current –5 0.1 +5 ✻✻✻µA
Capacitance 5 ✻ pF

TRANSFER CHARACTERISTICS
DC 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)

±0.25 ✻ % of FS

(2)

(adjustable to zero)

No Missing Codes Resolution 12 12 Bits

T

MIN

to T

MAX

(3)

Linearity Error ±1 ±1/2 LSB
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

AC ACCURACY

(4)

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

IN1

= 20kHz, F

IN2

= 23kHz)

TEMPERATURE COEFFICIENTS

(5)

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

POWER SUPPLY SENSITIVITY

Change in Full-Scale Calibration

(6)

+4.75V < VDD < +5.25V
Max Change ±1/2 ✻ LSB

CONVERSION TIME (Including Acquisition Time)
t

AQ

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

12-Bit Cycle, T

MIN

to T

MAX

: 8 8.5 ✻✻µs

SAMPLING DYNAMICS

Sampling Rate at 25°C 125 ✻ kHz

T

MIN

to T

MAX

117 ✻ kHz

Aperture Delay, t

AP

With VEE = +5V 20 ✻ ns
With V

EE

= 0V to –15V 1.6 ✻ µs
Aperture Uncertainty (Jitter)
With V

EE

= +5V 300 ✻ ps, rms

With V

EE

= 0V to –15V 10 ✻ ns, r ms

Settling time to 0.01% for 1.4 ✻ µs

Full-Scale Input Change

ADS7743

®

SPECIFICATIONS (CONT)

ELECTRICAL

At TA = T

MIN

to T

MAX

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

ADS774JE, JP, JU ADS774KE, KP, KU

PARAMETER MIN TYP MAX MIN TYP MAX UNITS

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.

OUTPUTS
DIGITAL (DB

11

- DB0, STATUS)

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

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

EE

(7)

–16.5 V

DD

✻✻V

V

DD

+4.5 +5.5 ✻✻V

Current: I

EE

(7)

(VEE = –15V) –1 ✻ mA

I

DD

+15 +24 ✻✻mA

Power Dissipation (T

MIN

to T

MAX

)

(V

EE

= 0V to +5V) 75 120 ✻✻mW

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

MIN

and T

MAX

. (4) Based on using VEE =
+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

EE

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

typ; when V

EE

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

®

ADS774 4

ABSOLUTE MAXIMUM RATINGS

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

V

DD

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

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

Control Inputs (CE, CS, A

O

, 12/8, R/C)

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

DD

+0.5V

Analog Inputs (Ref In, Bipolar Offset, 10V

IN

)

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

20V

IN

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

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

Momentary Short to V

DD

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

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

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

Thermal Resistance,

θ

JA

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

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

ELECTROSTATIC
DISCHARGE SENSITIVITY

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 degrada­tion 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.

1

2

3

4

5

Power-Up Reset

Control

Logic

Clock

12 Bits

Succesive Approximation Register

12

Bits

Three-State Buffers and Control

Nibble A

Nibble BNibble C

–
+

CDAC

6

7

8

9

10

11

12

13

14

28

27

26

25

24

23

22

21

20

19

18

17

16

15

+5VDC Supply

(V )

DD

A

O

–

R/C

–

12/8

CE

NC*

2.5V Ref
Out

Analog

Common

2.5V Ref
In

V

EE

Bipolar

Offset

10V Range

20V Range

Digital
Common

DB0 (LSB)

DB1

DB2

DB3

DB4

DB5

DB6

DB7

DB8

DB9

DB10

DB11 (MSB)

STATUS

*Not Internally Connected

2.5V

Reference

CS

PACKAGE/ORDERING INFORMATION

TEMPERATURE LINEARITY PACKAGE DRAWING

PRODUCT SINAD

(1)

RANGE ERROR PACKAGE NUMBER

(2)

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.

CONNECTION DIAGRAM