Overview
The AD2S99BP, produced by Analog Devices Inc., is a programmable sinusoidal oscillator designed to provide sine wave excitation for resolvers and a variety of AC transducers. This device integrates the functions of transducer excitation, synchronous reference output, and loss of signal detection into a compact, cost-effective package. It operates over a temperature range of –40°C to +85°C and is packaged in a 20-pin PLCC (Plastic Leaded Chip Carrier).
Key Specifications
| Parameter | Min | Typ | Max | Units | Test Conditions |
|---|---|---|---|---|---|
| Frequency Output Range | 2 kHz | - | 20 kHz | Hz | SEL1 and SEL2 pins configuration |
| Accuracy | - | - | - | - | Dependent on frequency selection |
| Quiescent Current (IDD, ISS) | ±8 | - | ±15 | mA | No load, VS = ±4.75 V to ±5.25 V |
| Operating Temperature Range | -40 | - | +85 | °C | - |
| Storage Temperature Range | -65 | - | +150 | °C | - |
| Supply Voltage (VDD, VSS) | ±4.75 | - | ±5.25 | V dc | - |
Key Features
- Programmable Sinusoidal Oscillator: The AD2S99BP allows for programmable excitation frequencies of 2 kHz, 5 kHz, 10 kHz, or 20 kHz using the frequency select pins. Intermediate frequencies can be achieved by adding an external resistor.
- Synthesized Synchronous Reference Output: Provides a 3 V p-p square wave output that is phase locked to the SIN and COS inputs, compensating for temperature and cabling dependent phase shifts.
- Loss-of-Signal Indicator: The device includes a “LOS” output pin that pulls high when a signal loss is detected on the transducer secondary winding connections.
- Compact Packaging: The AD2S99BP is packaged in a 20-pin PLCC, making it suitable for space-constrained applications.
Applications
- Resolvers: The AD2S99BP is used as an excitation source for resolvers, providing the necessary sine wave signals and synchronous reference outputs.
- Synchros: It serves as an excitation source for synchros, ensuring accurate and reliable operation.
- LVDTs and RVDTs: The device is suitable for Linear Variable Differential Transformers (LVDTs) and Rotary Variable Differential Transformers (RVDTs).
- Pressure Transducers and Load Cells: It can be used in pressure transducers and load cells to provide the necessary excitation signals.
- AC Bridges: The AD2S99BP is also applicable in AC bridge circuits, ensuring precise and stable operation.
Q & A
- What is the operating temperature range of the AD2S99BP?
The AD2S99BP operates over a temperature range of –40°C to +85°C. - How is the excitation frequency programmed on the AD2S99BP?
The excitation frequency is programmed using the frequency select pins (SEL1 and SEL2) to set frequencies of 2 kHz, 5 kHz, 10 kHz, or 20 kHz. Intermediate frequencies can be achieved by adding an external resistor. - What is the purpose of the synchronous reference output in the AD2S99BP?
The synchronous reference output is a 3 V p-p square wave that is phase locked to the SIN and COS inputs, compensating for temperature and cabling dependent phase shifts. - How does the AD2S99BP detect signal loss?
The device includes a “LOS” output pin that pulls high when a signal loss is detected on the transducer secondary winding connections. - What type of packaging does the AD2S99BP use?
The AD2S99BP is packaged in a 20-pin PLCC (Plastic Leaded Chip Carrier). - What are the typical applications of the AD2S99BP?
The AD2S99BP is used in resolvers, synchros, LVDTs, RVDTs, pressure transducers, load cells, and AC bridges. - What are the recommended decoupling capacitors for the AD2S99BP?
Decoupling capacitors of 100 nF (ceramic) and 4.7 µF (tantalum) should be connected in parallel between VDD and Analog Ground and VSS and Analog Ground. - Can multiple AD2S99BP devices share decoupling capacitors?
No, separate decoupling capacitors should be used for each AD2S99BP device. - What is the supply voltage range for the AD2S99BP?
The supply voltage range is ±4.75 V to ±5.25 V dc. - What is the quiescent current of the AD2S99BP?
The quiescent current (IDD, ISS) is ±8 mA to ±15 mA under no load conditions.
