|
|
PDF AD2S44 Data sheet ( Hoja de datos )
| Número de pieza | AD2S44 | |
| Descripción | Dual Channel Synchro/Resolver-to-Digital Converter | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de AD2S44 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
|
No Preview Available !
Data Sheet
Low Cost, 14-Bit, Dual Channel
Synchro/Resolver-to-Digital Converter
AD2S44
FEATURES
Low per-channel cost
32-lead DIL hybrid package
2.6 arc minute accuracy
14-bit resolution
Built-in test
Independent reference inputs
High tracking rate
APPLICATIONS
Gimbal/gyro control systems
Robotics
Engine controllers
Coordinate conversion
Military servo control systems
Fire control systems
Avionic systems
Antenna monitoring
CNC machine tooling
The core of each conversion is performed by state-of-the-art mono-
lithic, integrated circuits manufactured by the Analog Devices, Inc.,
proprietary BiMOS II process, which combines the advantages of
low power CMOS digital logic with bipolar linear circuits. The
use of these ICs keeps the internal component count low and
ensures high reliability.
The built-in test (BIT) facility can be used in failsafe systems to
provide an indication of whether the converter is tracking
accurately.
Each channel incorporates a high accuracy differential condi-
tioning circuit for signal inputs providing more than 74 dB of
common-mode rejection. Options are available for both synchro
and resolver format inputs. The converter output is via a three-state
transparent latch allowing data to be read without interruption
of the converter operation. The A/B and OE control lines select
the channel and present the digital position to the common
data outputs.
GENERAL DESCRIPTION
The AD2S44 is a 14-bit dual channel, continuous tracking synchro/
resolver-to-digital converter. It has been designed specifically
for applications where space, weight, and cost are at a premium.
Each 32-lead hybrid device contains two independent Type II servo
loop tracking converters. The ratiometric conversion technique
employed provides excellent noise immunity and tolerance of
long lead lengths.
The AD2S44 also features independent reference inputs where
different reference frequencies can be used for each channel.
All components are 100% tested at −55°C, +25°C, and +125°C.
Devices are processed to high reliability screening standards
and receive further levels of testing and screening to ensure
high levels of reliability.
FUNCTIONAL BLOCK DIAGRAM
RHI (A)
RLO (A)
S1 (A)
S2 (A)
S3 (A)
S4 (A)
S1 (B)
S2 (B)
S3 (B)
S4 (B)
RHI (B)
RLO (B)
REFERENCE
CONDITIONER
SYNCHRO/
RESOLVER
CONDITIONER
HIGH
SPEED
SIN/COS
MULTIPLIER
AD2S44
ERROR
AMP
PHASE-
SENSITIVE
DETECTOR
BUILT-IN
TEST
DETECTION
INTEGRATOR
SYNCHRO/
RESOLVER
CONDITIONER
REFERENCE
CONDITIONER
HIGH
SPEED
SIN/COS
MULTIPLIER
ERROR
AMP
PHASE-
SENSITIVE
DETECTOR
INTEGRATOR
Figure 1.
VCO
VCO
UP-DOWN
COUNTER
THREE-
STATE
OUTPUT
LATCHES
UP-DOWN
COUNTER
+VS
GND
–VS
BIT
A/B
OE
DB1 (MSB)
TO
DB14 (LSB)
Rev. B
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©1989–2011 Analog Devices, Inc. All rights reserved.
1 page  
AD2S44
Data Sheet
Parameter
Min Typ
Max Unit
DATA TRANSFER
Time to Data Stable (After Negative Edge of OE
or Change of Level of A/B)
640 ns
Time to Data in High Impedance State
(After Positive Edge of OE)
200 ns
Time for Repetitive Strobing of Selected Channel 200
ns
BUILT-IN TEST OUTPUT (BIT)
Sense
Active low
VOL
VOH
Drive Capability
0.4 V dc
2.4 V dc
8 LSTTL loads
Error Condition Set
55 LSB
Error Condition Cleared
45 LSB
Test Conditions/Comments
See Figure 6
tS
tR
tP
Low = error condition
IOL = 3.2 mA
IOH = −160 µA
1 Specified overtemperature range, −55°C to +125°C, and for: (a) ±10% signal and reference amplitude variation; (b) ±10% signal and reference harmonic distortion; (c)
±5% power supply variation; and (d) ±10% variation in reference frequency.
2 These parameters are 100% tested at nominal values of power supplies, input signal voltages, and operating frequency. All other parameters are guaranteed by
design, not tested.
Rev. B | Page 4 of 12
5 Page 
AD2S44
Ka does not define maximum acceleration; it defines only the
error due to acceleration. The maximum acceleration of which
the AD2S44 keeps track is approximate to 5 × Ka = 310,000°/sec2
or about 800 revolutions/sec2.
Ka can be used to predict the output position error due to input
acceleration. For example, an acceleration of 50 revolutions/sec2
with Ka = 62,000 is calculated using the following equation:
LSB
Input Acceleration
Errors in LSBs =
[ ] sec2 =
K a sec−2
50
rev
×
214
LSB
[ ]sec2
rev = 13.2 LSBs
62,000 sec−2
RELIABILITY
The reliability of these products is very high due to the extensive
use of custom chip circuits that decrease the active component
count. Calculations of the MTBF figure under various environ-
mental conditions are available upon request from Analog
Devices.
Figure 9 shows the MTBF in years vs. case temperature for
Naval Sheltered conditions calculated in accordance with the
Mil-Hdbk-217E.
100
Data Sheet
PROCESSING FOR HIGH RELIABILITY (B SUFFIX)
As a part of the high reliability manufacturing procedure, all
converters receive the processing shown in Table 6.
Table 6.
Process1
Precap Visual Inspection
Temperature Cycling
Constant Acceleration
Interim Electrical Tests
Operating Burn In
Seal Test, Fine and Gross
Final Electrical Test
External Visual Inspection
Conditions
MIL-STD-883, Method 2017
10 cycles, –65°C to +150°C
5000 Gs, Y1 plane
@ 25°C
160 hours @ 125°C
MIL-STD-883, Method 1014
Performed at TMIN, TAMB, TMAX
MIL-STD-883, Method 2009
1 Test and screening data supplied by request.
OTHER PRODUCTS
Analog Devices manufactures many other products concerned
with the conversion of synchro/resolver data, such as the
SDC/RDC1740 series and the AD2S80A series.
Hybrid
The SDC/RDC1740 is a hybrid synchro/resolver-to-digital
converter with internal isolating micro transformers.
Monolithic
The AD2S80A series are ICs performing resolver-to-digital
conversion with accuracies up to ±2 arc minutes and 16-bit
resolution.
10
1
25 45 65 85 105 125
TEMPERATURE (°C)
Figure 9. MTBF vs. Temperature
Rev. B | Page 10 of 12
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet AD2S44.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| AD2S44 | Dual Channel Synchro/Resolver-to-Digital Converter | Analog Devices |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |