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AD2S99 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer AD2S99
Beschreibung Programmable Oscillator
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 8 Seiten
AD2S99 Datasheet, Funktion
a
FEATURES
Programmable Sinusoidal Oscillator
Synthesized Synchronous Reference Output
Programmable Output Frequency Range: 2 kHz–20 kHz
“Loss-of-Signal” Indicator
20-Pin PLCC Package
Low Cost
APPLICATIONS
Excitation Source for:
Resolvers
Synchros
LVDTs
RVDTs
Pressure Transducers
Load Cells
AC Bridges
Programmable
Oscillator
AD2S99
FUNCTIONAL BLOCK DIAGRAM
FBIAS
SEL1
SEL2
FREQUENCY
SELECT
PUSH/
PULL
O/P STAGE
SINE WAVE
GENERATOR
AD2S99
PHASE
DETECT
LOGIC
SIN COS
FROM
TRANSDUCER
EXC TO
TRANSDUCER
EXC
SYNREF
SYNCHRONOUS
REFERENCE
LOS
GENERAL DESCRIPTION
The AD2S99 programmable sinusoidal oscillator provides sine
wave excitation for resolvers and a wide variety of ac transduc-
ers. The AD2S99 also provides a synchronous reference output
signal (3 V p-p square wave) that is phase locked to its SIN and
COS inputs. In an application, the SIN and COS inputs are
connected to the transducer’s secondary windings.
The synchronous reference output compensates for temperature
and cabling dependent phase shifts and eliminates the need for
external preset phase compensation circuits. The synchronous
reference output can be used as a zero crossing reference for
resolver-to-digital converters such as Analog Devices’ AD2S80A,
AD2S82A, AD2S83 and AD2S90.
The AD2S99 is packaged in a 20-pin PLCC and operates over
–40°C to +85°C.
PRODUCT HIGHLIGHTS
Dynamic Phase Compensation
The AD2S99 dynamically compensates for any phase variation
in a transducer by phase locking its synchronous reference out-
put to the transducer’s secondary windings.
Programmable Excitation Frequency
The excitation frequency is easily programmed to 2 kHz, 5 kHz,
10 kHz, or 20 kHz by using the frequency select pins. Interme-
diate frequencies are available by adding an external resistor.
Signal Loss Detection
The AD2S99 has the ability to detect if both the transducer sec-
ondary winding connections become disconnected from its SIN
and COS inputs. The “LOS” output pin pulls high when a sig-
nal loss is detected.
Integration
The AD2S99 integrates the transducer excitation, synchronous
reference, and loss of signal detection functions into a small,
cost effective package.
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
© Analog Devices, Inc., 1995
One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703






AD2S99 Datasheet, Funktion
AD2S99
AD2S99/AD2S82A TYPICAL CONFIGURATION
Figure 4 shows a typical circuit configuration for the AD2S99
Oscillator and the AD2S82A Resolver-to-Digital Converter.
The maximum level of the SIN and COS input signals to the
AD2S82A should be 2 V rms ± 10%. All the analog ground sig-
nals should be star connected to the AD2S82A AGND pin. If
shielded twisted pair cables are used for the resolver signals, the
shields should also be terminated at the AD2S82A AGND pin.
Coupling capacitor C3, and resistor to GND R3, between the
SYNREF output of the AD2S99 and the REF input pin of the
AD2S82A are optional. For additional information on selecting
component values for the AD2S82A, please refer to the
AD2S82A data sheet or the application note “Passive Compo-
nent Selection and Dynamic Modeling for the AD2S80 Series
Resolver-to-Digital Converters” (AN-266).
SYNREF
COS
–5V
COS
REF SIN
R3, C3 OPTIONAL
C3
R3
C1
VELOCITY
OUTPUT
C5
R5
R2
C4
C2
4.7µF
RESOLVER
SIN
R1 R4
AGND
0V
R6
NC 4
SIN
5
DGND
6
COS
7
NC 8
0.1µF
3 2 1 20 19
AD2S99
TOP VIEW
(Not to Scale)
EXC
18
EXC
17
AGND
16
15 NC
14 NC
9 10 11 12 13
50k 0.1µF
4.7µF
NC = NO CONNECT
LOS
SEL1 = GND
SEL2 = VSS
FOUT = 10kHz
AGND
10µF
+12V
SIN
I/P
7
0.1µF +VS 8
NC 9
MSB DB1
10
DB2 11
DB3 12
DB4 13
DB5 14
DB6 15
DB7 16
+5V
DB8 17
6 5 4 3 2 1 44 43 42 41 40
AD2S82A
TOP VIEW
(Not to Scale)
0.1µF
10µF
39 –VS
38 RC
–12V
37 DIR
36 BUSY
35 DATA LOAD
34 COMP
33 SC2
32 SC1
31 DIGITAL GND
30 INHIBIT
29 NC
DIGITAL
OUTPUT
DATA
DGND
18 19 20 21 22 23 24 25 26 27 28
0.1µF
+5V
10µF
Figure 4. AD2S99 and AD2S82A Example Configuration
–6– REV. B

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