AD2S1210BSTZ Overview
The AD2S1210BSTZ is a high-performance resolver-to-digital converter (RDC) with a programmable resolution from 10 to 16 bits. It includes a built-in adjustable sinusoidal oscillator that provides a stable excitation signal for resolvers. The chip converts the sine and cosine signals from the resolver into accurate digital angle and speed data, enabling precise position and velocity measurement.
It accepts input signals of 3.15 V p-p ±27% and operates within a frequency range of 2 kHz to 20 kHz. Using a Type II servo loop, it achieves fast and stable signal tracking, with a maximum tracking rate of 3125 rps. With excellent noise immunity and fast response, the AD2S1210BSTZ is widely used in motor control, servo drives, robotics, aerospace, and precision motion control systems, providing reliable data for high-accuracy closed-loop control.
AD2S1210BSTZ Specifications
Parameter | Value |
Part Number | AD2S1210BSTZ |
Description | IC CONV R/D 10-16BIT 48-LQFP |
Lead Free Status / RoHS Status | Lead free / RoHS Compliant |
Mounting Type | Surface Mount |
Supply Voltage | 4.75 V ~ 5.25 V |
Packaging | Tray |
Logic Voltage - VIL, VIH | 0.8V, 2.5V |
Base Part Number | AD2S1210 |
Moisture Sensitivity Level (MSL) | 3 (168 Hours) |
Type | R/D Converter |
Meta Part Number | AD2S1210BSTZ-ND |
Detailed Description | R/D Converter 10, 12, 14, 16 bit Serial, Parallel 48-LQFP (7x7) |
Supplier Device Package | 48-LQFP (7x7) |
Operating Temperature | -40°C ~ 85°C |
Number of Channels | 2 |
Voltage Supply Source | Analog and Digital |
Manufacturer Standard Lead Time | 7 Weeks |
Package / Case | 48-LQFP |
Resolution (Bits) | 10, 12, 14, 16 b |
Data Interface | Serial, Parallel |
AD2S1210BSTZ Key Features
l Complete monolithic resolver-to-digital converter
l 3125 rps maximum tracking rate (10-bit resolution and
l CLKIN = 10.24 MHz)
l ±2.5 (+ 1 LSB) arc minutes of angular accuracy (B andD grades)
l 10-/12-/14-/16-bit resolution, set by user
l Parallel and serial 10-bit to 16-bit data ports
l Absolute position and velocity outputs
l System fault detection
l Programmable fault detection thresholds
l Differential inputs
l Incremental encoder emulation
l Programmable sinusoidal oscillator on-board
l Compatible with DSP and SPI standards
l 5 V supply with 2.3 V to 5.25 V logic interface
l −40°C to +125°C temperature rating (C, D, and W grades)
l AEC-Q100 qualified for automotive applications
l ASIL B safety assessment certificate available
l Safety manual available
Functional Block Diagram
From the functional block diagram of the AD2S1210BSTZ, the main structure includes a reference oscillator, ADC, Type II tracking loop, position and velocity registers, fault detection module, and data interface. The internal reference oscillator (DAC) and reference synthesis module work together to generate the excitation signal required by the resolver. The “Excitation Outputs” provide stable sine waves to drive the external resolver.
The sine and cosine signals from the resolver are converted by the ADC and then sent to the Type II tracking loop. This loop calculates the angle and speed in real time and sends the results to the position and velocity registers. This design ensures high accuracy and stable tracking performance even during dynamic operation.
The AD2S1210BSTZ also integrates a fault detection module that monitors input signal errors, oscillator failures, or loss of tracking. Fault information is reported through specific output pins. The chip also includes encoder emulation outputs and a data bus interface for easy communication with external controllers, supporting flexible data reading, writing, and configuration.
Highlights of AD2S1210BSTZ
Ratiometric tracking conversion
The Type II tracking loop provides continuous output position data without conversion delay. It also provides noise immunity and tolerance of harmonic distortion on the reference and input signals.
System fault detection
A fault detection circuit can sense loss of resolver signals, out-of-range input signals, input signal mismatch, or loss of position tracking. The fault detection threshold levels can be individually programmed by the user for optimization within a particular application.
Input signal range
The sine and cosine inputs can accept differential input voltages of 3.15 V p-p ± 27%.
Programmable excitation frequency
Excitation frequency is easily programmable to a number of standard frequencies between 2 kHz and 20 kHz.
Triple format position data
Absolute 10-bit to 16-bit angular position data is accessed via either a 16-bit parallel port or a 4-wire serial interface. Incremental encoder emulation is in standard A-quad-B format with direction output available.
Digital velocity output
10-bit to 16-bit signed digital velocity accessed via either a 16-bit parallel port or a 4-wire serial peripheral interface (SPI).
AD2S1210BSTZ Applications
1. DC and AC Servo Motor Control
The AD2S1210BSTZ can accurately read resolver signals. It outputs position and speed data in real time. This provides high-precision feedback for servo motors. It is very important for automation equipment and robots that need precise position and speed control. The built-in Type II tracking loop keeps stable response even in high-speed motion. It reduces mechanical vibration and errors.
Use Case:
In industrial robots, AD2S1210BSTZ provides precise position feedback to control robotic arms.
2. Encoder Emulation
Some systems need resolver signals converted to standard encoder output. The AD2S1210BSTZ can emulate an encoder. It provides quadrature signals (A/B) and an index pulse (Z). This makes it compatible with controllers using standard encoders. This feature is useful for upgrading old systems or mixed control setups.
Use Case:
In a legacy CNC machine, the chip emulates an encoder to interface with the existing controller.
3. Electric Power Steering (EPS)
EPS systems need precise angle and speed information. This ensures smooth and safe steering. The AD2S1210BSTZ can monitor the steering wheel angle and speed in real time. It sends data to the EPS control unit. This allows accurate steering torque adjustment and improves driving safety and comfort.
Use Case:
In a passenger car, it measures steering wheel angle and speed to adjust power assist torque.
4. Electric Vehicles (EV)
Precise position and speed detection is crucial for EV motor control. The AD2S1210BSTZ can be used in motor feedback loops. It enables efficient motor control and energy recovery. The chip also has a fault detection module. It can alert the system in case of abnormalities, improving vehicle reliability.
Use Case:
In an electric car, the chip monitors motor rotor position for smooth acceleration and energy recovery.
5. Integrated Starter Generators and Alternators
In hybrid and electric vehicles, ISGs and alternators need accurate position detection. This ensures smooth starting, energy recovery, and power management. The AD2S1210BSTZ provides high-resolution angle and speed data. It supports complex control algorithms. Its high-temperature and vibration-resistant design suits automotive environments.
Use Case:
In a hybrid vehicle, AD2S1210BSTZ tracks the rotor angle of an integrated starter generator to manage start-stop operations.
6. Automotive Motion Sensing and Control
The AD2S1210BSTZ is not only for power systems. It can also support vehicle motion control, such as ESC, steering, and braking systems. By providing real-time and precise angle and speed information, the chip helps vehicles achieve intelligent control. It improves handling and safety.
Use Case:
In ESC systems, the chip provides wheel or steering angle data for stability and braking control.
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