PDF AD2S99 Data sheet ( Hoja de datos )

Número de pieza	AD2S99
Descripción	Programmable Oscillator
Fabricantes	Analog Devices
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No Preview Available ! 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 1 page AD2S99 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 be 2 V rms ± 10%. All the analog ground sig- nals should be star connected to the AD2S90 AGND pin. If shielded twisted pair cables are used for the resolver signals, the shields should also be terminated at the AD2S90 AGND pin. The SYNREF output of the AD2S99 should be connected to the REF input pin of the AD2S90 via a 0.1 µF capacitor with a 100 kΩ resistor to GND. This is to block out any dc offset in the SYNREF signal. For more detailed information please refer to the AD2S90 data sheet. VDD VSS 0.1µF 4.7µF NC = NO CONNECT SEL2 = GND SEL1 = VSS FOUT = 5kHz NC 4 SIN 5 DGND 6 COS 7 NC 8 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 50kΩ 0.1µF VDD 4.7µF 0.1µF 100kΩ S2 COS S4 R2 S3 REF SIN R4 RESOLVER S1 18 17 16 15 14 S4 REF 19 COS LO VDD VDD 13 20 COS S2 1 AGND VSS 12 DGND 11 S3 2 SIN AD2S90 10 3 SIN LO TOP VIEW (Not to Scale) 9 S1 4 5 6 7 8 POWER RETURN 0.1µF 0.1µF Figure 3. AD2S99 and AD2S90 Example Configuration 4.7µF VDD 4.7µF VSS REV. B –5– 5 Page

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