AD2S1200 Analog Devices, Inc., AD2S1200 Datasheet
AD2S1200
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AD2S1200 Summary of contents
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... Analog Devices. Trademarks and registered trademarks are the property of their respective owners. GENERAL DESCRIPTION The AD2S1200 is a complete 12-bit resolution tracking resolver- to-digital converter, integrating an on-board programmable sinusoidal oscillator that provides sine wave excitation for resolvers ...
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... Electric vehicles Integrated starter generator/alternator Encoder emulation Automotive motion sensing and control PRODUCT HIGHLIGHTS • Complete Resolver-to-Digital Interface: The AD2S1200 provides the complete solution for digitizing resolver signals (12-bit resolution) with on-board programmable sinusoidal oscillator. • Ratiometric Tracking Conversion: This technique provides continuous output position data without conversion delay ...
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... Serial Interface.............................................................................14 REVISION HISTORY Revision 0: Initial Version Incremental Encoder Outputs...................................................16 On-Board Programmable Sinusoidal Oscillator.....................16 Supply Sequencing and Reset....................................................17 Charge Pump Output .................................................................17 Circuit Dynamics ............................................................................18 AD2S1200 Loop Response Model ............................................18 Sources of Error ..........................................................................19 Clock Requirements ...................................................................20 Connecting to the DSP...............................................................20 Outline Dimensions........................................................................21 Ordering Guide ...........................................................................21 Rev Page AD2S1200 ...
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... AD2S1200 AD2S1200–SPECIFICATIONS Table 1. ( 5.0 V ± −40°C to +125°C CLKIN 8.192 MHz, unless otherwise noted Parameter Sin, Cos INPUTS 1 Voltage Input Bias Current Input Impedance Common Mode Volts Phase Lock Range ANGULAR ACCURACY Angular Accuracy Resolution Linearity INL ...
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... DOS indicated before angular output error exceeds limit. Maximum electrical rotation before DOS is indicated. LOT goes low when internal error signal exceeds threshold. Guaranteed by design. Guaranteed by design ±IOUT = 100 µA Square wave output 2 mA load −1 mA load AD2S1200 ...
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... AD2S1200 ABSOLUTE MAXIMUM RATINGS Table 2. Parameter Supply Voltage ( Supply Voltage ( Input Voltage Output Voltage Swing Operating Temperature Range (Ambient) Storage Temperature Range Lead Temperature Soldering Vapor Phase (60 sec) Infrared (15 sec) ESD CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection ...
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... Input 31 Input 32 Input 33 Output 34 Input, output 35 Output 36 Ground 37 Supply 38 Output 39 Output 40 Input 41 Ground 42 Output 43 Output 44 Output Rev Page AD2S1200 33 RESET 32 FS2 31 FS1 30 LOT 29 DOS 28 DIR CPO 23 DGND Pin Name Pin Type NM Output DIR Output DOS Output LOT ...
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... AD2S1200 RESOLVER FORMAT SIGNALS × Sin(ϖ θ × Sin(ϖt) × Sin(θ (A) CLASSICAL RESOLVER A resolver is a rotating transformer typically with a primary winding on the rotor and two secondary windings on the stator. In the case of a variable reluctance resolver, there are no wind- ings on the rotor as shown in Figure 3 ...
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... For more information about the operation of the converter, see the Circuit Dynamics section. FAULT DETECTION CIRCUIT The AD2S1200 fault detection circuit will detect loss of resolver signals, out of range input signals, input signal mismatch, or loss of position tracking. In these cases, the position indicated by the AD2S1200 may differ significantly from the actual shaft position of the resolver ...
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... Responding to a Fault Condition If any fault condition (LOS, DOS, or LOT) is indicated by the AD2S1200, the output data must be presumed to be invalid. This means that even if a RESET or SAMPLE pulse releases the fault condition, the output data may be corrupted, even though a fault may not be immediately indicated after the RESET / SAMPLE event ...
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... Figure 5. Connecting the AD2S1200 to a Resolver The gain of the buffer depends on the type of resolver used. Since the specified excitation output amplitudes are matched ± 5% the specified Sin/Cos input amplitudes, the gain of the buffer is DD determined by the attenuation of the resolver ...
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... PARALLEL INTERFACE The angular position and angular velocity are available on the AD2S1200 in two 12-bit registers, which can be accessed via the 12-bit parallel port. The parallel interface is selected holding the SOE pin high. Data is transferred from the velocity and position integrators, respectively, to the position and velocity registers following a high-to-low transition on the SAMPLE pin ...
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... Disable Delay RD/CS Low to Data High POS Figure 7. Parallel Port Read Timing Rev Page VEL Min Typ ~122 ns 2 × × AD2S1200 Max ...
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... AD2S1200 SERIAL INTERFACE The angular position and angular velocity are available on the AD2S1200 in two 12-bit registers. These registers can be accessed via a 3-wire serial interface, SO and SCLK, that operates at clock rates MHz and is compatible with SPI and DSP interface standards. The serial interface is selected by holding low the SOE pin ...
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... POS t SCLK t 10 MSB–1 LSB RDVEL DOS Figure 8. Serial Port Read Timing Rev Page VEL t 11 LOT PAR Min Typ AD2S1200 Max t SCLK ...
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... The reference output of the AD2S1200 will need an external buffer amplifier to provide gain and the additional current to drive a resolver. Refer to Figure 6 for a suggested buffer circuit. The AD2S1200 also provides an internal synchronous reference signal that is phase locked to its Sin and Cos inputs. Phase ...
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... SAMPLE LOT DOS CHARGE PUMP OUTPUT A 204.8 kHz square wave output with 50% duty cycle is avail- able at the CPO output pin of the AD2S1200. This square wave output can be used for negative rail voltage generation create a V Rev Page AD2S1200 ) as shown in Figure 10 for internal ...
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... response to a small step change in position (<20°). In response to a step change in velocity, the AD2S1200 will exhibit the same response characteristics as for a step change in position. Rev Page − s ...
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... AD2S1200 has been defined as the acceleration that creates an output position error of 5° (when LOT is indicated). The maximum acceleration can be calculated as Maximum The AD2S1200 will be able to withstand the maximum acceleration of 103,000 rps reaching its maximum tracking rate of 1,000 rps. 10k 100k ...
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... In this mode, the ADMC401 uses the internal TFS signal as external RFS to fully control the timing of receiving data and it uses the same TFS the AD2S1200. The ADMC401 also provides an internal continuous serial clock to the AD2S1200. The SAMPLE signal on the AD2S1200 could be provided either ...
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... Dimensions shown in millimeters Angular Accuracy Package Description ±11 arc min 44-Lead Low Profile Quad Flat Package (LQFP) ±22 arc min 44-Lead Low Profile Quad Flat Package (LQFP) Rev Page 12.00 BSC PIN 1 10.00 TOP VIEW BSC (PINS DOWN 0.45 0.80 BSC 0.37 0.30 AD2S1200 Package Option ST-44 ST-44 ...
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... AD2S1200 NOTES Rev Page ...
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... NOTES Rev Page AD2S1200 ...
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... AD2S1200 NOTES © 2003 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. C04406-0-10/03(0) Rev Page ...