Overview
The AD2S1205, specifically the ADW71205WSTZ-RL model from Analog Devices Inc., is a comprehensive 12-bit resolution tracking resolver-to-digital converter. This device is designed to convert resolver signals into digital representations of angle and velocity, making it highly suitable for applications requiring precise position and velocity measurements. The AD2S1205 features an on-board programmable sinusoidal oscillator, which provides the necessary sine wave excitation for resolvers. It is particularly tailored to meet the quality and reliability requirements of automotive and other demanding applications.
Key Specifications
| Specification | Value | Notes |
|---|---|---|
| Resolution | 12-bit | |
| Input Signal Range | 3.15 V p-p ± 27% | Differential input voltages on Sin and Cos inputs |
| Excitation Frequency | 10 kHz, 12 kHz, 15 kHz, or 20 kHz | Programmable using FS1 and FS2 pins |
| Tracking Rate | Up to 1250 rps (CLKIN = 10.24 MHz) | Dependent on external clock frequency |
| Dynamic Performance | Bandwidth: 1000 - 2400 Hz | |
| Acceleration Error | 30 Arc minutes at 10,000 rps | CLKIN = 8.192 MHz |
| Settling Time | 5.2 ms to within ±11 arc minutes | Y grade, CLKIN = 10.24 MHz |
| Voltage Reference (REFOUT) | 2.39 - 2.52 V | ±100 μA load |
| Power Supply (IDD Dynamic) | 20 mA |
Key Features
- Ratiometric Tracking Conversion: Continuous output position data without conversion delay, providing noise immunity and tolerance of harmonic distortion on the reference and input signals.
- System Fault Detection: Detects loss of resolver signals, out-of-range input signals, input signal mismatch, or loss of position tracking.
- Programmable Excitation Frequency: Easily programmable to 10 kHz, 12 kHz, 15 kHz, or 20 kHz using the frequency select pins (FS1 and FS2).
- Triple Format Position Data: Absolute 12-bit angular position data accessible via a 12-bit parallel port or a 3-wire serial interface. Incremental encoder emulation in standard A-quad-B format with direction output available.
- Digital Velocity Output: 12-bit signed digital velocity accessible via either a 12-bit parallel port or a 3-wire serial interface.
Applications
The AD2S1205 is particularly suited for applications in the automotive sector, as well as in other industries requiring precise position and velocity measurements. These include:
- Automotive systems (e.g., steering, transmission, and engine control)
- Industrial control systems
- Aerospace and defense applications
- Robotics and automation
Q & A
- What is the resolution of the AD2S1205 resolver-to-digital converter?
The AD2S1205 has a 12-bit resolution.
- What are the acceptable input signal ranges for the Sin and Cos inputs?
The Sin and Cos inputs can accept differential input voltages of 3.15 V p-p ± 27%.
- How can the excitation frequency be programmed?
The excitation frequency can be programmed to 10 kHz, 12 kHz, 15 kHz, or 20 kHz using the frequency select pins (FS1 and FS2).
- What is the maximum tracking rate of the AD2S1205?
The maximum tracking rate is up to 1250 rps, dependent on the external clock frequency (CLKIN = 10.24 MHz).
- Does the AD2S1205 have fault detection capabilities?
Yes, it includes a fault detection circuit that can sense loss of resolver signals, out-of-range input signals, input signal mismatch, or loss of position tracking.
- How is the position data output formatted?
The position data is available in absolute 12-bit angular position format via a 12-bit parallel port or a 3-wire serial interface, and also in incremental encoder emulation format in standard A-quad-B with direction output.
- What is the dynamic performance bandwidth of the AD2S1205?
The dynamic performance bandwidth is between 1000 Hz and 2400 Hz.
- What is the acceleration error at high speeds?
The acceleration error is 30 Arc minutes at 10,000 rps (CLKIN = 8.192 MHz).
- How long does it take for the AD2S1205 to settle after a step input?
The settling time is 5.2 ms to within ±11 arc minutes (Y grade, CLKIN = 10.24 MHz).
- What is the power consumption of the AD2S1205 in dynamic mode?
The power consumption (IDD Dynamic) is 20 mA.
