AD2S82ALPZ Analog Devices Inc, AD2S82ALPZ Datasheet

2 ARC MIN PLCC MONO R/D

AD2S82ALPZ

Manufacturer Part Number
AD2S82ALPZ
Description
2 ARC MIN PLCC MONO R/D
Manufacturer
Analog Devices Inc
Type
R/D Converterr
Datasheet

Specifications of AD2S82ALPZ

Rohs Compliant
YES
Input Type
Parallel
Output Type
Digital
Interface
Parallel
Current - Supply
30mA
Mounting Type
Surface Mount
Package / Case
44-PLCC
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

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a
GENERAL DESCRIPTION
The AD2S80A is a monolithic 10-, 12-, 14-, or 16-bit tracking
resolver-to-digital converter contained in a 40-lead DIP or 44-
terminal LCC ceramic package. It is manufactured on a BiMOS
II process that combines the advantages of CMOS logic and
bipolar high accuracy linear circuits on the same chip.
The converter allows users to select their own resolution and dynamic
performance with external components. This allows the users great
flexibility in defining the converter that best suits their system
requirements. The converter allows users to select the resolution
to be 10, 12, 14, or 16 bits and to track resolver signals rotating
at up to 1040 revs per second (62,400 rpm) when set to 10-bit
resolution.
The AD2S80A converts resolver format input signals into a
parallel natural binary digital word using a ratiometric tracking
conversion method. This ensures high-noise immunity and toler-
ance of lead length when the converter is remote from the resolver.
The 10-, 12-, 14- or 16-bit output word is in a three-state digital
logic available in 2 bytes on the 16 output data lines. BYTE
SELECT, ENABLE and INHIBIT pins ensure easy data trans-
fer to 8- and 16-bit data buses, and outputs are provided to
allow for cycle or pitch counting in external counters.
An analog signal proportional to velocity is also available and
can be used to replace a tachogenerator.
The AD2S80A operates over 50 Hz to 20,000 Hz reference
frequency.
PRODUCT HIGHLIGHTS
Monolithic. A one chip solution reduces the package size
required and increases the reliability.
Resolution Set by User. Two control pins are used to select
the resolution of the AD2S80A to be 10, 12, 14, or 16 bits allowing
the user to use the AD2S80A with the optimum resolution for
each application.
Ratiometric Tracking Conversion. Conversion technique
provides continuous output position data without conversion
delay and is insensitive to absolute signal levels. It also provides
good noise immunity and tolerance to harmonic distortion on
the reference and input signals.
Dynamic Performance Set by the User. By selecting exter-
nal resistor and capacitor values the user can determine bandwidth,
maximum tracking rate and velocity scaling of the converter to
match the system requirements. The external components
required are all low cost preferred value resistors and capacitors,
and the component values are easy to select using the simple
instructions given.
Velocity Output. An analog signal proportional to velocity is
available and is linear to typically one percent. This can be used
in place of a velocity transducer in many applications to provide
loop stabilization in servo controls and velocity feedback data.
Low Power Consumption. Typically only 300 mW.
Military Product. The AD2S80A is available processed in
accordance with MIL-STD-883B, Class B.
MODELS AVAILABLE
Information on the models available is given in the section
“Ordering Information.”
ANALOG
SIG GND
Variable Resolution, Monolithic
COS I/P
RIPPLE
SIN I/P
DATA
LOAD
+12V
–12V
GND
CLK
Resolver-to-Digital Converter
A1
A2
FUNCTIONAL BLOCK DIAGRAM
16-BIT UP/DOWN COUNTER
SWITCHING
SEGMENT
OUTPUT DATA LATCH
16 DATA BITS
AD2S80A
R-2R
DAC
A3
DETECTOR
SENSITIVE
PHASE
AD2S80A
TRANSFER
VCO DATA
LOGIC
INTEGRATOR
O/P
VCO I/P

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AD2S82ALPZ Summary of contents

Page 1

GENERAL DESCRIPTION The AD2S80A is a monolithic 10-, 12-, 14-, or 16-bit tracking resolver-to-digital converter contained in a 40-lead DIP or 44- terminal LCC ceramic package manufactured on a BiMOS II process that combines the advantages of ...

Page 2

AD2S80A–SPECIFICATIONS Parameter SIGNAL INPUTS Frequency Voltage Level Input Bias Current Input Impedance Maximum Voltage REFERENCE INPUT Frequency Voltage Level Input Bias Current Input Impedance CONTROL DYNAMICS Repeatability Allowable Phase Shift Tracking Rate 1 Bandwidth ACCURACY Angular Accuracy Monotonicity Missing Codes ...

Page 3

Parameter DATA LOAD Sense 3 BUSY Sense Width Load 3 DIRECTION Sense Max Load 3 RIPPLE CLOCK Sense Width Reset Load DIGITAL INPUTS High Voltage Low Voltage DIGITAL INPUTS High Current Low Current, I ...

Page 4

AD2S80A–SPECIFICATIONS Parameter RATIO MULTIPLIER AC Error Output Scaling PHASE SENSITIVE DETECTOR Output Offset Voltage Gain In Phase In Quadrature Input Bias Current Input Impedance Input Voltage INTEGRATOR Open-Loop Gain Dead Zone Current (Hysteresis) Input Offset Voltage Input Bias Current Output ...

Page 5

RECOMMENDED OPERATING CONDITIONS ) . . . . . . . . . ± ± 10% Power Supply Voltage (+V , – ...

Page 6

AD2S80A CONNECTING THE CONVERTER The power supply voltages connected to +V should be + and – and must not be reversed. The voltage applied to V can ...

Page 7

CONVERTER OPERATION When connected in a circuit such as shown in Figure 1 the AD2S80A operates as a tracking resolver-to-digital converter and forms a Type 2 closed-loop system. The output will auto- matically follow the input for speeds up to ...

Page 8

AD2S80A COMPONENT SELECTION The following instructions describe how to select the external components for the converter in order to achieve the required bandwidth and tracking rate. In all cases the nearest “preferred value” component should be used, and a 5% ...

Page 9

DATA TRANSFER To transfer data the INHIBIT input should be used. The data will be valid 600 ns after the application of a logic “LO” to the INHIBIT. This is regardless of the time when the INHIBIT is applied and ...

Page 10

AD2S80A CIRCUIT FUNCTIONS AND DYNAMIC PERFORMANCE The AD2S80A allows the user greater flexibility in choosing the dynamic characteristics of the resolver-to-digital conversion to ensure the optimum system performance. The characteristics are set by the external components shown in Figure 1, ...

Page 11

DEMODULATOR OUTPUT voltage will equal the DEMODULATOR INPUT). This provides a signal at the DEMODULATOR OUTPUT which level proportional to the positional ...

Page 12

AD2S80A –3 –6 –9 –12 0.04f 0.02f 0.1f 0.2f 0. FREQUENCY 180 135 –45 –90 –135 –180 0.4f 0.02f 0.04f 0.1f 0. FREQUENCY OUTPUT ...

Page 13

SOURCES OF ERRORS Integrator Offset Additional inaccuracies in the conversion of the resolver signals will result from an offset at the input to the integrator as it will be treated as an error signal. This error will typically be 1 ...

Page 14

AD2S80A CONNECTING THE RESOLVER The recommended connection circuit is shown in Figure 7. In cases where the reference phase relative to the input signals from the resolver requires adjustment, this can be easily achieved by varying the value of the ...

Page 15

R3 100k C3 100nF REFERENCE INPUT 100nF COS HIGH RESOLVER SIGNALS REF LOW COS LOW SIN LOW SIN HIGH +12V 360 315 270 225 180 135 TIME – 4.7M C2 ...

Page 16

AD2S80A APPLICATIONS Control Transformer The ratio multiplier of the AD2S80A can be used independently of the loop integrators as a control transformer. In this mode the resolver inputs θ are multiplied by a digital angle φ any differ- ence between ...

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