ANALOG DEVICES AD2S1210-EP Service Manual

Variable Resolution, 10-Bit to 16-Bit R/D

AD2S1210-EP

EXCI

REFERENCE

MULTIPLEXER

DATA BUS OUTPUT

DATA I/O

VELOCITY
REGISTER

09154-001

Converter with Reference Oscillator

FEATURES

Complete monolithic resolver-to-digital converter
3125 rps maximum tracking rate (10-bit resolution)
±2.5 arc minutes of accuracy
10-/12-/14-/16-bit resolution, set by user
Parallel and serial 10-bit to 16-bit data ports
Absolute position and velocity outputs
System fault detection
Programmable fault detection thresholds
Differential inputs
Incremental encoder emulation
Programmable sinusoidal oscillator on board
Compatible with DSP and SPI interface standards
5 V supply with 2.3 V to 5 V logic interface
Support defense and aerospace applications (AQEC)

Military temperature range (−55°C to +125°C)

Controlled manufacturing baseline
One assembly/test site
One fabrication site
Enhanced product change notification
Qualification data available upon request

APPLICATIONS

DC and ac servo motor control
Encoder emulation
Electric power steering
Electric vehicles
Integrated starter generators/alternators
Automotive motion sensing and control

GENERAL DESCRIPTION

The AD2S1210-EP is a complete 10-bit to 16-bit resolution
tracking resolver-to-digital converter, integrating an on-board
programmable sinusoidal oscillator that provides sine wave
excitation for resolvers.

The converter accepts 3.15 V p-p ± 27% input signals, in the range
of 2 kHz to 20 kHz on the sine and cosine inputs. A Type II
servo loop is employed to track the inputs and convert the input
sine and cosine information into a digital representation of the
input angle and velocity. The maximum tracking rate is 3125 rps.

Full details about this enhanced product, including theory of
operation, registers details, and applications information, are
available in the AD2S1210 data sheet, which should be
concluded in conjunction with this data sheet.

FUNCTIONAL BLOCK DIAGRAM

CRYSTAL

INTERNAL

CLOCK

GENERATOR

FAULT

DETECTION

CONFIGURATION

REGISTER

FAULT
DETECTION
OUTPUTS

DATA I/O

TATION

OUTPUTS

INPUTS

FROM

RESOLVER

ENCODER

EMULATION

OUTPUTS

REFERENCE

OSCILLATOR

SYNTHETIC

REFERENCE

ADC

ADC

ENCODER

EMULATION

RESET

(DAC)

TRACKING LOOP

POSITION

REGISTER

VOLTAGE

REFERENCE

TYPE II

Figure 1.

PINS

AD2S1210-EP

PRODUCT HIGHLIGHTS

1. 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.

2. 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.

3. Input signal range. The sine and cosine inputs can accept

differential input voltages of 3.15 V p-p ± 27%.

4. Programmable excitation frequency. Excitation frequency

is easily programmable to a number of standard frequencies
between 2 kHz and 20 kHz.

5. Tri p l e 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.

6. Digital velocity output. 10-bit to 16-bit signed digital

velocity accessed via either a 16-bit parallel port or a 4-wire
serial interface.

Rev. 0

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