ADVANCED
LINEAR
DEVICES, INC.
ALD500RAU/ALD500RA/ALD500R
PRECISION INTEGRATING ANALOG PROCESSOR
WITH PRECISION VOLTAGE REFERENCE
BENEFITS
APPLICATIONS
• Low cost, simple functionality
• Wide dynamic signal range
• Very high noise immunity
• 4 1/2 digits to 5 1/2 digits plus sign measurements
• Precision analog signal processor
• Precision sensor interface
• 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
• High accuracy DC measurement functions
• Portable battery operated instruments
• Computer peripheral
• PCMCIA
• Inherently linear and stable with temperature
and component variations
FEATURES
• Resolution up to 18 bits plus sign bit and over-range bit
• Accuracy independent of input source impedances
• Accurate on-chip voltage reference
PIN CONFIGURATION
ALD500R
• Tempco as low as 10 ppm/°C guaranteed
• Chip select - power down mode
• High input impedance of 1012
Ω
I
1
2
3
4
5
20
19
18
17
16
15
14
13
12
11
C
V
B
S
• 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
+
C
INT
-
V
DGND
C
C
OUT
AZ
B
B
A
UF
6
7
AGND
-
+
C
V
V
REF
REF
N/C
N/C
IN
+
C
-
8
IN
+
9
V
REF
REF
-
10
• Optional digital control from a microcontroller, an ASIC, or
V
a dedicated digital circuit
• Flexible conversion speed vs. resolution trade-off
QE, PE, SE PACKAGE
N/C pin is connected internally. Connect to V .
-
*
Ordering Information
Resolution Endpoint Voltage Reference
Linearity Accuracy/Tempco
Package Type
Operating
Temperature
20L PDIP
20L SOIC
20L QSOP
ALD500R-50QE
20LCDIP
16 bit
17 bit
18 bit
17 bit
18 bit
17 bit
18 bit
18 bit
0.015%
0.01%
0.5% 50ppm/C
0.3% 20ppm/C
ALD500R-50PE
ALD500R-50SE
0°C to 70°C
0°C to 70°C
ALD500RA-20PE
ALD500RAU-20PE
ALD500RA-10PE
ALD500RAU-10PE
ALD500RA-20PEI
ALD500RA-20SE
ALD500RAU-20SE
ALD500RA-10SE
ALD500RAU-10SE
ALD500RA-20SEI
ALD500RA-20QE
ALD500RAU-20QE
ALD500RA-10QE
ALD500RAU-10QE
ALD500RA-20QEI
0.005%
0.01%
0.2% 10ppm/C
0.3% 20ppm/C
0.3% 20ppm/C
0°C to 70°C
0.005%
0.01%
-40°C to +85°C
0.005%
0.005%
ALD500RAU-20PEI ALD500RAU-20SEI ALD500RAU-20QEI
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 94089-1706Tel: (408) 747-1155, Fax: (408) 747-1286
http://www.aldinc.com