A
DVANCED
L
INEAR
D
EVICES,
I
NC.
ALD500RAU/ALD500RA/ALD500R
PRECISION INTEGRATING ANALOG PROCESSOR
WITH PRECISION VOLTAGE REFERENCE
APPLICATIONS
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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
BENEFITS
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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
FEATURES
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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 10
12
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
PIN CONFIGURATION
ALD500R
I
B
C
INT
V-
C
AZ
B
UF
AGND
C-
REF
C+
REF
N/C
N/C
1
2
3
4
5
6
7
8
9
10
QE, PE, SE PACKAGE
20
19
18
17
16
15
14
13
12
11
C
S
V+
DGND
C
OUT
B
A
V+
IN
V-
IN
V+
REF
V-
REF
* N/C pin is connected internally. Connect to V-.
Ordering Information
Resolution Endpoint
Linearity
16 bit
17 bit
18 bit
17 bit
18 bit
17 bit
18 bit
18 bit
0.015%
0.01%
0.005%
0.01%
0.005%
0.01%
0.005%
0.005%
0.3% 20ppm/C
0.3% 20ppm/C
0.2% 10ppm/C
Voltage Reference
Accuracy/Tempco
20L PDIP
0.5% 50ppm/C
0.3% 20ppm/C
ALD500R-50PE
ALD500RA-20PE
ALD500RAU-20PE
ALD500RA-10PE
ALD500RAU-10PE
ALD500RA-20PEI
ALD500RAU-20PEI
20L SOIC
ALD500R-50SE
ALD500RA-20SE
ALD500RAU-20SE
ALD500RA-10SE
ALD500RAU-10SE
ALD500RA-20SEI
ALD500RAU-20SEI
Package Type
20L QSOP
ALD500R-50QE
ALD500RA-20QE
ALD500RAU-20QE
ALD500RA-10QE
ALD500RAU-10QE
ALD500RA-20QEI
ALD500RAU-20QEI
ALD500RAU-20DE
-55°C to +125°C
-40°C to +85°C
0°C to 70°C
20LCDIP
0°C to 70°C
0°C to 70°C
Operating
Temperature
*
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: (408) 747-1155, Fax: (408) 747-1286
http://www.aldinc.com