AD2S99BPZ

Programmable Timers And Oscillators Overview

The AD2S99BPZ is a programmable sinusoidal oscillator manufactured by Analog Devices Inc., designed to provide sine wave excitation for resolvers and AC transducers. It operates within a frequency range of 2 kHz to 20 kHz, selectable via pins SEL1 and SEL2. The device integrates dynamic phase compensation, locking its synchronous reference output (SYNREF) to the transducer's secondary windings to compensate for temperature and cabling phase shifts. It features signal loss detection (LOS), dual EXC outputs with 180-degree phase separation, and operates on ±5 V supplies over a –40°C to +85°C temperature range in a 20-pin PLCC package.

Programmable Timers And Oscillators Feature Summary

• Programmable excitation frequencies: 2 kHz, 5 kHz, 10 kHz, or 20 kHz via SEL1/SEL2 pins; intermediate frequencies adjustable via FBIAS pin resistor.
• Dynamic phase compensation synchronizes the SYNREF square wave output to the SIN/COS inputs, eliminating external preset phase circuits.
• Loss-of-Signal (LOS) indicator pulls high when both SIN and COS signals fall below threshold levels.
• Dual EXC outputs (Pin 17 and Pin 18) provide differential drive with 180-degree phase advance for transducer excitation.

Programmable Timers And Oscillators Applications

• Excitation source for resolvers
• Excitation source for synchros
• Excitation source for LVDTs and RVDTs
• Reference signal generation for resolver-to-digital converters (e.g., AD2S80A, AD2S90)

Programmable Timers And Oscillators Procurement Notes

Verify the BP grade accuracy specifications against application requirements. The AP grade offers ±10% frequency accuracy at +25°C, while the BP grade provides tighter ±5% accuracy at +25°C and ±10% across the full operating temperature range. Confirm that the 20-pin PLCC package aligns with the target PCB footprint and that ESD precautions are observed during handling due to device sensitivity.

Programmable Timers And Oscillators Selection Notes

Select the AD2S99BPZ when higher frequency amplitude accuracy is required compared to the AP grade variant. Ensure the system design supports the ±5 V dual supply requirement. For applications needing frequencies other than the standard 2, 5, 10, or 20 kHz, utilize the FBIAS pin with an external pull-up resistor to VDD as detailed in the datasheet graphs. Verify that the load impedance connected to the EXC pins does not exceed the 8 mA rms current drive capability without external buffering.

Programmable Timers And Oscillators Part Context

The AD2S99BPZ belongs to the AD2S99 family of programmable oscillators from Analog Devices. It serves as a companion component to various resolver-to-digital converters such as the AD2S80A, AD2S82A, AD2S83, and AD2S90. The BP suffix denotes the commercial grade with improved accuracy specifications over the AP grade, while maintaining the same 20-pin PLCC physical form factor and functional interface.

Programmable Timers And Oscillators Replacement Considerations

The AD2S99AP is a direct functional substitute within the same package, differing primarily in accuracy grades (AP vs. BP). No other cross-model replacements are documented in the provided datasheet.