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AD2S99 датащи(PDF) 1 Page - Analog Devices |
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AD2S99 датащи(HTML) 1 Page - Analog Devices |
1 / 8 page 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. a Programmable Oscillator FUNCTIONAL BLOCK DIAGRAM FREQUENCY SELECT SINE WAVE GENERATOR PHASE DETECT LOGIC SIN COS FROM TRANSDUCER FBIAS SEL1 SEL2 AD2S99 EXC SYNREF SYNCHRONOUS REFERENCE LOS TO TRANSDUCER PUSH/ PULL O/P STAGE EXC 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. 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. 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 © 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 |
Аналогичный номер детали - AD2S99_15 |
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Аналогичное описание - AD2S99_15 |
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