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ADW71205WSTZ-RL View Datasheet(PDF) - Analog Devices

Part Name
Description
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ADW71205WSTZ-RL
ADI
Analog Devices ADI
ADW71205WSTZ-RL Datasheet PDF : 20 Pages
First Prev 11 12 13 14 15 16 17 18 19 20
AD2S1205
A separate screened twisted pair cable is recommended for
analog inputs Sin/SinLO and Cos/CosLO. The screens should
terminate to either REFOUT or AGND.
S2
S3
R2
S4
10nF 10μF
68k
S1
4.7μF
68k
R1
5V
BUFFER
CIRCUIT
10nF
BUFFER
CIRCUIT
44 43 42 41 40 39 38 37 36 35 34
5V
1 DVDD
2
3
4
5
6
7
8
9
10
11
AD2S1205
RESET
33
32
31
30
29
28
27
26
25
24
DGND 23
12 13 14 15 16 17 18 19 20 21 22
5V
8.192
MHz
4.7μF
10nF
20pF
20pF
Figure 5. Connecting the AD2S1205 to a Resolver
C1
EXC/EXC
(VIN)
R2
12V
R1
(VREF) AD8662
12V
VOUT
5V
Figure 6. Buffer Circuit
CLOCK REQUIREMENTS
To achieve the specified dynamic performance, an external crystal
is recommended at the CLKIN and XTALOUT pins. The position
and velocity accuracy are guaranteed for a frequency range of
8.192 MHz ± 25%. However, the velocity outputs are scaled in
proportion to the clock frequency so that if the clock is 25%
greater than the nominal, the full-scale velocity is 25% greater than
nominal. The maximum tracking rate, tracking loop bandwidth,
and excitation frequency also vary with the clock frequency.
ABSOLUTE POSITION AND VELOCITY OUTPUT
The angular position and velocity are represented by binary data
and can be extracted via either a 12-bit parallel interface or a
3-wire serial interface that operates at clock rates of up to 25 MHz.
SOE Input
The serial output enable pin (SOE) is held high to enable the
parallel interface and low to enable the serial interface. In the
latter case, Pin DB0 to Pin DB9 are placed into a high impedance
state while DB11 is the serial output (SO) and DB10 is the serial
clock input (SCLK).
Data Format
The angular position data represents the absolute position of
the resolver shaft as a 12-bit unsigned binary word. The angular
velocity data is a 12-bit twos complement word, representing
the velocity of the resolver shaft rotating in either a clockwise
or counterclockwise direction.
PARALLEL INTERFACE
The angular position and velocity are available on the AD2S1205
in two 12-bit registers, accessed via the 12-bit parallel port. The
parallel interface is selected by holding the SOE pin high. Data
is transferred from the velocity and position integrators to the
position and velocity registers, respectively, after a high-to-low
transition on the SAMPLE pin. The RDVEL pin selects whether
data from the position or velocity register is transferred to the
output register. The CS pin must be held low to transfer data
from the selected register to the output register. Finally, the RD
input is used to read the data from the output register and to
enable the output buffer. The timing requirements for the read
cycle are shown in Figure 7.
SAMPLE Input
Data is transferred from the position and velocity integrators to
the position and velocity registers, respectively, after a high-to-
low transition on the SAMPLE signal. This pin must be held
low for at least t1 to guarantee correct latching of the data. RD
should not be pulled low before this time because data will not
be ready. The converter continues to operate during the read
process. A rising edge of SAMPLE resets the internal registers
that contain the minimum and maximum magnitude of the
monitor signal.
Rev. A | Page 12 of 20
 

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