APPLICATIONS

• 4 1/2 digits to 5 1/2 digits plus sign measurements

• Precision analog signal processor

• Precision sensor interface

• High accuracy DC measurement functions

• Portable battery operated instruments

• Computer peripheral

• PCMCIA

FEATURES

• Resolution up to 18 bits plus sign bit and over-range bit

• Accuracy independent of input source impedances

• Accurate on-chip voltage reference

• Tempco as low as 10 ppm/

°C guaranteed

• Chip select - power down mode

Ω

• Inherently filters and integrates any external noise spikes

• Differential analog input

• Wide bipolar analog input voltage range

±3.5V

• Automatic zero offset compensation

• Low linearity error - as low as 0.001% typical

• Fast zero-crossing comparator - 1

µs

• Low power dissipation - 6mW typical

• Automatic internal polarity detection

• Low input current - 2pA typical

• Optional digital control from a microcontroller, an ASIC, or

a dedicated digital circuit

• Flexible conversion speed vs. resolution trade-off

ALD500RAU/ALD500RA/ALD500R

PRECISION INTEGRATING ANALOG PROCESSOR

WITH PRECISION VOLTAGE REFERENCE

Rev. 1.01 © 1999 Advanced Linear Devices, Inc., 415 Tasman Drive, Sunnyvale, California 94089-1706 Tel: (408) 747-1155, Fax: (408) 747-1286

http://www.aldinc.com

PIN CONFIGURATION

Resolution Endpoint

Voltage Reference

Package Type

Operating

Linearity

Accuracy/Tempco

Temperature

20L PDIP

20L SOIC

20L QSOP

20LCDIP

16 bit

0.015%

0.5% 50ppm/C

ALD500R-50PE

ALD500R-50SE

ALD500R-50QE

0

°C to 70°C

17 bit

0.01%

0.3% 20ppm/C

ALD500RA-20PE

ALD500RA-20SE

ALD500RA-20QE

0

°C to 70°C

18 bit

0.005%

ALD500RAU-20PE

ALD500RAU-20SE

ALD500RAU-20QE

17 bit

0.01%

0.2% 10ppm/C

ALD500RA-10PE

ALD500RA-10SE

ALD500RA-10QE

0

°C to 70°C

18 bit

0.005%

ALD500RAU-10PE

ALD500RAU-10SE

ALD500RAU-10QE

17 bit

0.01%

0.3% 20ppm/C

ALD500RA-20PEI

ALD500RA-20SEI

ALD500RA-20QEI

-40

°C to +85°C

18 bit

0.005%

ALD500RAU-20PEI

ALD500RAU-20SEI

ALD500RAU-20QEI

18 bit

0.005%

0.3% 20ppm/C

ALD500RAU-20DE

-55

°C to +125°C

Ordering Information

BENEFITS

• Low cost, simple functionality

• Wide dynamic signal range

• Very high noise immunity

• Automatic compensation and cancellation

of error sources

• Easy to use to acquire bipolar signals

• Up to 19 bit (18 bit + sign bit) single conversion

or 21 bit (20 bit + sign bit) multiple conversion

and noise performance

• Inherently linear and stable with temperature

and component variations

V+

1

2

3

14

15

16

4

13

B

5

12

A

V+REF

6

7

8

10

11

V-

CAZ

CINT

BUF

AGND

N/C

C+REF

9

V-IN

V+IN

COUT

DGND

QE, PE, SE PACKAGE

C-REF

ALD500R

17

20

19

18

V-REF

CS

IB

N/C

* N/C pin is connected internally. Connect to V-.