ALD500RAU Datasheet, PDF (1/12 Pages) Advanced Linear Devices – PRECISION INTEGRATING ANALOG PROCESSOR WITH PRECISION VOLTAGE REFERENCE

ADVANCED
LINEAR
DEVICES, INC.
ALD500RAU/ALD500RA/ALD500R
PRECISION INTEGRATING ANALOG PROCESSOR
WITH PRECISION VOLTAGE REFERENCE
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
• High input impedance of 10¹² 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 - 1µs
• 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
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
PIN CONFIGURATION
ALD500R
IB 1
CINT 2
V- 3
CAZ 4
BUF 5
AGND 6
C-REF 7
C+REF 8
N/C ⁹
N/C ¹⁰
20 CS
19 V+
18 DGND
17 C_OUT
16 B
15 A
14 V+_IN
13 V-IN
12 V+_REF
11 V-_REF
QE, PE, SE PACKAGE
* N/C pin is connected internally. Connect to V-.
Ordering Information
Resolution Endpoint Voltage Reference
Linearity Accuracy/Tempco
20L PDIP
16 bit 0.015% 0.5% 50ppm/C ALD500R-50PE
Package Type
20L SOIC
ALD500R-50SE
20L QSOP
ALD500R-50QE
20LCDIP
Operating
Temperature
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
* Contact factory for customized voltage reference voltage levels, accuracy and tempco specifications.
Rev. 1.01 © 1999 Advanced Linear Devices, Inc., 415 Tasman Drive, Sunnyvale, California 94089-1706 Tel: [phone], Fax: [phone]
http://www.aldinc.com