AD2S99 Analog Devices, AD2S99 Datasheet

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AD2S99

Manufacturer Part Number
AD2S99
Description
Programmable Oscillator
Manufacturer
Analog Devices
Datasheet

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a
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
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.
–40 C to +85 C.
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
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.
One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.
Tel: 617/329-4700
FBIAS
SEL1
SEL2
AD2S99
FREQUENCY
SELECT
FUNCTIONAL BLOCK DIAGRAM
TRANSDUCER
GENERATOR
SIN
SINE WAVE
DETECT
PHASE
LOGIC
FROM
COS
O/P STAGE
Programmable
PUSH/
PULL
© Analog Devices, Inc., 1995
AD2S99
Oscillator
Fax: 617/326-8703
EXC
EXC
SYNREF
SYNCHRONOUS
REFERENCE
LOS
TO
TRANSDUCER

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AD2S99 Summary of contents

Page 1

... 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 ...

Page 2

... AD2S99–SPECIFICATIONS Parameter FREQUENCY OUTPUT RANGE 2 kHz 5 kHz 10 kHz 20 kHz ACCURACY Frequency Amplitude Power Supply Rejection Ratio ANALOG OUTPUTS Amplitude EXC, EXC SYNREF SYNREF OFFSET Current Drive Capability EXC, EXC Capacitive Drive Total Harmonic Distortion EXC, EXC ANALOG INPUTS SIN, COS ...

Page 3

... ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the AD2S99 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality ...

Page 4

... AD2S99, the LOS output pin of the AD2S99 (Pin 11 Logic Lo ( 0.7 V). If both the SIN and COS signals on the re- via solver secondary windings fall below the LOS threshold level of DD the AD2S99, the LOS pin of the AD2S99 will pull Logic –4– 4 ...

Page 5

... AD2S99/AD2S90 TYPICAL CONFIGURATION Figure 3 shows a typical circuit configuration for the AD2S99 Oscillator and the AD2S90 Resolver-to-Digital Converter. The maximum level of the SIN and COS input signals to the AD2S90 should rms 10%. All the analog ground sig- nals should be star connected to the AD2S90 AGND pin. If ...

Page 6

... OUT Figure 4. AD2S99 and AD2S82A Example Configuration 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” ...

Page 7

... Figure 5. AD2S99 and AD2S93 Example Configuration REV. B shields should also be terminated at the AD2S93 AGND pin. The SYNREF output of the AD2S99 cannot be used as the REF input signal for the AD2S93. The zero crossing reference for the AD2S93 should be taken from the primary winding of the LVDT through a phase lead or lag network ...

Page 8

... OUT RMS R1 A SUITABLE AMPLIFIER FOR ABOVE IS THE OP279 Figure 7. Sample Buffer Configurations OUT SIN 5 AD2S99 REF SIN TOP VIEW DGND 6 (Not to Scale) COS 7 COS CONNECT Figure 8. The SSM2142 as a Single Ended to Differential ...

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