IC, PROG OSCILLATOR, 20KHZ, 5.25V, LCC20

AD2S99APZ

Manufacturer Part NumberAD2S99APZ
DescriptionIC, PROG OSCILLATOR, 20KHZ, 5.25V, LCC20
ManufacturerAnalog Devices Inc
TypeOscillator, Sinusoidal
AD2S99APZ datasheet
 

Specifications of AD2S99APZ

Supply Voltage Range± 4.75V To ± 5.25VDigital Ic Case StyleLCC
No. Of Pins20Operating Temperature Range-40°C To +85°C
Frequency Max20kHzTermination TypeSMD
Frequency20kHzVoltage - Supply±4.75 V ~ 5.25 V
Current - Supply8mAOperating Temperature-40°C ~ 85°C
Package / Case20-PLCCFilter TerminalsSMD
Rohs CompliantYesAccuracy5
Lead Free Status / RoHS StatusLead free / RoHS CompliantCount-
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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
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.
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.
Programmable
FUNCTIONAL BLOCK DIAGRAM
PUSH/
PULL
O/P STAGE
FBIAS
FREQUENCY
SINE WAVE
SEL1
SELECT
GENERATOR
SEL2
PHASE
DETECT
LOGIC
AD2S99
SIN
COS
FROM
TRANSDUCER
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.
© Analog Devices, Inc., 1995
One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.
Tel: 617/329-4700
Oscillator
AD2S99
EXC
TO
TRANSDUCER
EXC
SYNREF
SYNCHRONOUS
REFERENCE
LOS
Fax: 617/326-8703

AD2S99APZ Summary of contents

  • Page 1

    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 GENERAL DESCRIPTION The ...

  • 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 ...

  • Page 3

    ABSOLUTE MAXIMUM RATINGS ...

  • Page 4

    AD2S99 CONNECTING THE AD2S99 OSCILLATOR Refer to Figure 1. Positive supply voltage V nected to Pin 12 and negative supply voltage V nected to both Pins 19 and 20. Reversal of these power supplies will destroy the device. The appropriate ...

  • 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 ...

  • Page 6

    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 rms 10%. All ...

  • Page 7

    AD2S99/AD2S93 TYPICAL CONFIGURATION Figure 5 shows a typical circuit configuration for the AD2S99 Oscillator and the AD2S93 LVDT-to-Digital Converter. The maximum level of the A and B transducer input signals to the AD2S93 should rms 20%. All ...

  • Page 8

    AD2S99 OUT RMS EXC EXC SIN 5 17 AD2S99 DGND AGND 6 TOP VIEW 16 (Not to Scale) COS ...