AD2S99AP

Programmable Timers And Oscillators Overview

The AD2S99AP is a programmable sinusoidal oscillator designed to provide excitation for resolvers and AC transducers. It generates sine wave outputs on EXC pins and provides a synthesized synchronous reference (SYNREF) output phase-locked to SIN/COS inputs. The device features dynamic phase compensation, signal loss detection (LOS), and selectable frequencies of 2 kHz, 5 kHz, 10 kHz, or 20 kHz via SEL1/SEL2 pins. Intermediate frequencies are adjustable using the FBIAS pin. It operates on ±4.75 V to ±5.25 V supplies with quiescent current of ±8 mA typical, housed in a 20-pin PLCC package.

Programmable Timers And Oscillators Feature Summary

• Programmable excitation frequency: 2 kHz, 5 kHz, 10 kHz, or 20 kHz via SEL1/SEL2 pins; intermediate frequencies adjustable via FBIAS resistor.
• Synthesized synchronous reference output (SYNREF) phase-locked to SIN/COS inputs for dynamic phase compensation.
• Loss-of-signal (LOS) indicator that pulls high when both SIN and COS signals fall below threshold.
• Dual differential sinusoidal excitation outputs (EXC, EXC) with 2 V rms amplitude.

Programmable Timers And Oscillators Applications

• Excitation source for resolvers and synchros.
• Drive for LVDTs, RVDTs, pressure transducers, and load cells.
• AC bridge circuits requiring precise sinusoidal excitation.

Programmable Timers And Oscillators Procurement Notes

Verify component authenticity through authorized Analog Devices distributors or certified suppliers. Confirm the part number matches AD2S99AP specifically, noting the AP grade specifications. Check for ESD sensitivity warnings during handling. Ensure supply voltage rails are within ±4.75 V to ±5.25 V limits before powering. Review the datasheet for proper decoupling capacitor placement near VDD and VSS pins.

Programmable Timers And Oscillators Selection Notes

Select the AD2S99AP when dynamic phase compensation is required for resolver applications. Choose this model if fixed frequencies of 2–20 kHz are needed without external oscillators. Consider the BP grade variant if tighter accuracy specifications are required. Ensure the application supports dual supply voltages of ±5 V. Verify that the 20-pin PLCC package fits the PCB layout constraints.

Programmable Timers And Oscillators Part Context

The AD2S99 is part of Analog Devices' family of resolver interface components. It complements R/D converters such as the AD2S80A, AD2S82A, AD2S83, and AD2S90 by providing the necessary excitation and phase-coherent reference signals. The AP grade offers standard accuracy specifications suitable for general industrial applications.

Programmable Timers And Oscillators Replacement Considerations

The AD2S99BP is available as an alternative with improved accuracy specifications (±5% frequency at +25°C vs ±10% for AP). No direct single-pin compatible replacements are documented in the provided datasheet. Evaluate system compatibility if upgrading grades.