PIN LIST

Pin Number

Name

Type

Description

TQFP44

TQFP48

1 - 2, 10 to 13,

21 to 24, 32 to

35, 43 - 44

1 - 2, 10 to 14,

22 to 26, 34 to

38, 46 to 48

NC

-

Not connected

3

3

SCLK

O

Shift Clock Output

4

4

FS

I/O

Frame Synchronization Input (slave)/Output (master)

55

I

Positive Digital Power Supply (2.7V TO 5.5V)

6

6

DGND

I

Digital Ground

7

7

MCM

I

Master Clock Mode

8

8

XTALOUT

O

Crystal Output

9

9

XTALIN/MCLK

I

Crystal Input (MCM = 1) / External Clock (MCM = 0)

14

15

HC1

I

Hardware Control Input

15

16

HC0

I

Hardware Control Input

16

17

PWRDWN

I

Power down Input

17

18

M/S

I

Master/Slave Mode Control Pin Input

18

19

O

16-bit D/A and A/D Positive Reference Voltage

19

20

O

16-bit D/A and A/D Negative Reference Voltage

20

21

AGND1

I

Analog Ground

25

27

AUXIN+

I

Non-inverting Input to Auxiliary Analog Input

26

28

AUXIN-

I

Inverting Input to Auxiliary Analog Input

27

29

IN+

I

Non-inverting Input to Analog Input Amplifier

28

30

IN-

I

Inverting Input to Analog Input Amplifier

29

31

I

Positive Analog Power Supply (2.7V to 5.5V)

30

32

O

31

33

AGND2

I

Analog Ground

36

39

OUT+

O

Non-inverting Smoothing Filter Output

37

40

OUT-

O

Inverting Smoothing Filter Output

38

41

RESET

I

Reset Function to initialize the internal counters

39

42

TS

I

Timeslot Control Input

40

43

TSTD1

I/O

Digital Input/Output reserved for test

41

44

DIN

I

Serial Data Input

42

45

DOUT

O

Serial Data Output

PIN DESCRIPTION

1 - POWER SUPPLY (5 pins)

This pin is the positive analog power supply

voltage for the DAC and the ADC section.

In any case the voltage on this pin must be higher

or equal to the voltage of the Digital power supply

This pin is the positive digital power supply for DAC

and ADC digital internal circuitry.

1.3 - Analog Ground (AGND1, AGND2)

These pins are the ground return of the analog DAC

(ADC) section.

1.4 - Digital Ground (DGND)

This pin is the ground for DAC and ADC internal

digital circuitry.

Ground, respectively. The decoupling is intended to isolate digital noise from the analog section ; decoupling capacitors should

be as close as possible to the respective analog and digital supply pins.

respectively.

STLC7550

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