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ALD521D

Description
SPECIALTY ANALOG CIRCUIT, PDSO18
Categoryaccessories   
File Size32KB,6 Pages
ManufacturerALD [Advanced Linear Devices]
Download Datasheet Compare View All

ALD521D Overview

SPECIALTY ANALOG CIRCUIT, PDSO18

A
DVANCED
L
INEAR
D
EVICES,
I
NC.
ALD521D
24 BIT SERIAL INTERFACE DIGITAL CONTROLLER
APPLICATIONS
• Operate in conjunction with ALD500/ALD500R
Precision analog signal processors
• High accuracy DC voltage measurement functions
• Portable battery operated instruments
• PC-based software control or stand-alone operation (without
other processors or PC)
• Serial digital output interface to other microprocessors or
microcontrollers
GENERAL DESCRIPTION
The ALD521D is a digital controller designed to interface to the ALD500
or ALD500R integrating dual slope analog processors as a chip set for
building a precision analog-to-digital converter. With the ALD521D and
ALD500R, together with a few external capacitors and resistors, a
precision Analog to Digital converter with auto zero and auto-polarity
can be implemented.
The ALD521D can operate in either a stand-alone mode or in an
external microprocessor control mode. In the stand-alone mode, the
ALD521D can either making continuous measurements or a single
measurement. Under external microprocessor control, the ALD521D
can directly interact with a PC under PC software control via a standard
parallel printer port with no other components, or it can also communicate
with other microcontrollers serially.
The ALD500/ALD500R analog processors consist of on-chip digital
control circuitry to accept control inputs, integrating buffer amplifiers,
analog switches, and voltage comparators. It functions in four operating
modes, or phases, namely auto zero, integrate, deintegrate, and
integrator zero phases. At the end of a conversion, the comparator
output goes from high to low when the integrator crosses zero during
deintegration. ALD500 analog processors also provide direct logic
interface to CMOS logic families.
FEATURES AND BENEFITS
Low cost, simple functionality
PC parallel printer port interface standard
Support resolution up to 23 binary bits + sign
polarity bit
Easy to use to acquire up to 23 bit linearity
and noise performance
Integration time can be set by the user
Easy user evaluation and setting of
conversion parameters
Low power dissipation - 4 mA typical
including crystal oscillator
On-chip Crystal Oscillator Circuit
Two way asynchronous handshake data
transfer
Conversion speed versus resolution trade-off
Power down (sleep mode) control input to
power down to 2
µA
Chip Select control input
High impedance DV, D
OUT
and S
CLK
when chip not selected
Single 3 V to 5 V power supply
PIN CONFIGURATION
ALD521D
S
2
S
3
C
OUT
PWRUP
1
2
3
4
5
6
7
8
9
PD, SD PACKAGE
18
17
16
15
14
13
12
11
10
S
1
DV
CS
D
OUT
DGND
C
S
B
A
N/C
ORDERING INFORMATION
Operating Temperature Range *
0°C to +70°C
0°C to +70°C
18-Pin
Plastic Pin
Package
18-Pin
Small Outline
Package (SOIC)
V+
XTAL
OUT
XTAL
IN
C
OUT
S
CLK
ALD521DPD
*
Contact factory for industrial temperature range
ALD521DSD
*
Note:
N/C - No Conncection
© 2000 Advanced Linear Devices, Inc., 415 Tasman Drive, Sunnyvale, California 94089-1706, Tel: (408) 747-1155, Fax: (408) 747-1286
http://www.aldinc.com

ALD521D Related Products

ALD521D ALD521DPD ALD521DSD
Description SPECIALTY ANALOG CIRCUIT, PDSO18 SPECIALTY ANALOG CIRCUIT, PDSO18 SPECIALTY ANALOG CIRCUIT, PDSO18
Maker - ALD [Advanced Linear Devices] ALD [Advanced Linear Devices]
Parts packaging code - DIP SOIC
Contacts - 18 18
Reach Compliance Code - unknow unknow
Analog Integrated Circuits - Other Types - ANALOG CIRCUIT ANALOG CIRCUIT
JESD-30 code - R-PDIP-T18 R-PDSO-G18
Number of terminals - 18 18
Package body material - PLASTIC/EPOXY PLASTIC/EPOXY
Package shape - RECTANGULAR RECTANGULAR
Package form - IN-LINE SMALL OUTLINE
Certification status - Not Qualified Not Qualified
surface mount - NO YES
Terminal form - THROUGH-HOLE GULL WING
Terminal location - DUAL DUAL
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