3

SCD5028-2 Rev G 5/7/2014

Aeroflex Plainview

PIN DESCRIPTIONS

SIGNAL

DIRECTION

PIN

SIGNAL DESCRIPTION

+SIN

-SIN

INPUT

22

21

Analog Sine input from Synchro or Resolver. 1.3Vrms nominal

+COS

-COS

INPUT

25

24

Analog Cosine input from Synchro or Resolver. 1.3Vrms nominal

+REF

-REF

INPUT

11

12

Analog Reference input is typically a sine wave @ 1.3Vrms

BIT 1 (MSB)

BIT 2

BIT 3

BIT 4

BIT 5

BIT 6

BIT 7

BIT 8

BIT 9

BIT 10

BIT 11

BIT 12

BIT 13

BIT 14

BIT 15

BIT 16 (LSB)

BIDIR

28

29

30

31

32

34

35

36

37

38

39

40

41

42

43

44

Digital angle data. Parallel format. Natural binary positive logic.

Bit 1, most significant bit = 180°, Bit 2 = 90°, Bit 3 = 45° and so on.

In the 10 bit mode, Bit 10 is the LSB. Bits 11-16 are 0s.

In the 12 bit mode, Bit 12 is the LSB. Bits 13-16 are 0s.

In the 14 bit mode, Bit 14 is the LSB. Bits 15-16 are 0s.

In the 16 bit mode, Bit 16 is the LSB.

SC1

SC2

INPUT

49

48

Digital input. Sets the resolution.

SC1

SC2

Resolution

0

0

10 bit

0

1

12 bit

1

0

14 bit

1

1

16 bit

ENABLE*

INPUT

45

Logic 0 enables digital angle output. Otherwise it is high impedance.

INH*

INPUT

47

Logic 0 freezes the digital angle output so that it can be safely read.

DATALOAD*

INPUT

1

Logic 0 enables the digital angle lines to be inputs to preset the angle.

Logic 1 is for normal digital angle output.

BUSY

OUTPUT

50

A logic 1 pulse when the digital angle changes by 1 LSB.

CW/CCW

OUTPUT

51

For turns counting. Logic 1 = counting up (CW), logic 0 = counting

down (CCW).

RIPPLE*

OUTPUT

52

Ripple clock for turns counting. A logic 0 pulse = a 0° transition in

either direction.

AC1

AC2

OUTPUT

14

13

Differential AC error output

BPF1

BPF2

INPUT

16

15

Differential AC error input to demodulator

DEMOD1

DEMOD2

OUTPUT

17

18

Differential DC error output

INTIN1

INTIN2

INPUT

8

6

Differential DC input to differential velocity integrator

INT1

INT 2

OUTPUT

9

10

Differential velocity output

VCOIN

INPUT

5

Input to Voltage Controlled Oscillator

POWER

4

27

Analog Power In

Digital Power In

A GND

D GND

POWER

3, 19, 23

26

Analog Power ground

Digital Power ground

POWER

2

Digital input/output DC power supply. Sets logic 1 level. +3V to +5V

* Indicates Active Low Signal