Overview
The AD2S99BPZ, produced by Analog Devices Inc., is a programmable sinusoidal oscillator designed to provide sine wave excitation for resolvers and a wide variety of AC transducers. This device integrates the functions of transducer excitation, synchronous reference output, and loss of signal detection into a compact and cost-effective package. It is particularly useful in applications requiring precise phase locking and compensation for temperature and cabling-dependent phase shifts.
Key Specifications
| Parameter | Min | Typ | Max | Units | Test Conditions |
|---|---|---|---|---|---|
| Frequency Output Range | 2 kHz | - | 20 kHz | Hz | SEL1 and SEL2 pin configurations |
| Accuracy | - | - | - | - | Dependent on frequency selection |
| Quiescent Current (IDD, ISS) | ±8 mA | - | ±15 mA | mA | No load |
| Operating Temperature Range | -40°C | - | +85°C | °C | - |
| Storage Temperature Range | -65°C | - | +150°C | °C | - |
| Package Type | - | - | 20-Pin PLCC | - | - |
Key Features
- Programmable sinusoidal oscillator with output frequencies of 2 kHz, 5 kHz, 10 kHz, and 20 kHz, and the ability to set intermediate frequencies using an external resistor.
- Synchronous reference output signal (3 V p-p square wave) phase locked to the SIN and COS inputs, eliminating the need for external preset phase compensation circuits.
- Loss of signal detection with a “LOS” output pin that pulls high when a signal loss is detected.
- Compact 20-pin PLCC package.
- Operates over a temperature range of –40°C to +85°C.
Applications
- Excitation source for resolvers, synchros, LVDTs (Linear Variable Differential Transformers), RVDTs (Rotary Variable Differential Transformers), pressure transducers, load cells, and AC bridges.
Q & A
- What is the primary function of the AD2S99BPZ?
The AD2S99BPZ is a programmable sinusoidal oscillator that provides sine wave excitation for resolvers and various AC transducers. - How can the output frequency of the AD2S99BPZ be programmed?
The output frequency can be programmed to 2 kHz, 5 kHz, 10 kHz, or 20 kHz using the frequency select pins (SEL1 and SEL2). Intermediate frequencies can be achieved by adding an external resistor. - What is the synchronous reference output used for?
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 AD2S99BPZ detect signal loss?
The AD2S99BPZ has a “LOS” output pin that pulls high when a signal loss is detected from the transducer secondary winding connections. - What is the operating temperature range of the AD2S99BPZ?
The device operates over a temperature range of –40°C to +85°C. - What type of package does the AD2S99BPZ come in?
The AD2S99BPZ is packaged in a 20-pin PLCC (Plastic Leaded Chip Carrier). - Can the AD2S99BPZ be used with resolver-to-digital converters?
Yes, 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. - What are the recommended decoupling capacitors for the AD2S99BPZ?
Decoupling capacitors of 100 nF (ceramic) and 4.7 µF (tantalum) are recommended to be connected in parallel between VDD and Analog Ground and VSS and Analog Ground. - What is the storage temperature range for the AD2S99BPZ?
The storage temperature range is –65°C to +150°C. - What types of transducers can the AD2S99BPZ be used with?
The AD2S99BPZ can be used with resolvers, synchros, LVDTs, RVDTs, pressure transducers, load cells, and AC bridges.
