4

28

BCK

I/O

Serial bit transfer clock for serial input data SIN or serial output data SOUT

(64FS). Outputs in master mode (when Pin 26 is High). Inputs in slave mode

(when Pin 26 is Low). Retrieves serial input data at

; send serial out-

put data at

.

29

SIN

I

Serial data input of 2-channel sampling. The data format is 2’s complement,

and consists of 32-bit slot.

30

SOUT

O

Serial data output of 2-channel per sampling. The data format is 2’s comple-

ment, and consists of 32-bit slot.

31

—Digital GND

32

MASL

I

Selects whether 16-bit serial data is applied in the first 16-bits or the last 16-

bit of 32-bit slot in serial I/O. High = Frontward truncation; Low = Rearward

truncation

33

MLSL

I

Selects whether 16-bit serial data is input/output at LSB first or MSB first in

serial I/O. High = MSB first; Low = LSB first

34

XSL0

I

Crystal oscillator selection. Three bits, XSL0 to 2. Selects the clock frequency

to be input from XTLI (Pin 7).

35

XSL1

I

Crystal oscillator selection. Three bits, XSL0 to 2. Selects the clock frequency

to be input from XTLI (Pin 7).

36

XSL2

I

Crystal oscillator selection. Three bits, XSL0 to 2. Selects the clock frequency

to be input from XTLI (Pin 7).

37

DASL0

I

IC measurement. Normally, fixed at High.

38

DASL1

I

IC measurement. Normally fixed at Low.

39

WO

I

Window masked when High; window open when Low (forced synchroniza-

tion). Equipped with a pull-up resistor.

40

—

Digital power supply

41

NC

—

42

NC

—

43

SUB

—

Connected to the substrate in the IC (having the same potential as power sup-

ply). Connect this pin to GND via capacitor on the external printed wiring

board.

44

—

Analog power supply for channel-1 AD converter

45

AIN1

I

Analog input of channel-1 AD converter

46

—

Analog GND for channel-1 AD converter

47

—

Analog GND for channel-1 DA converter

48

AOUT1 (+)

O

Analog forward phase output of channel-1 DA converter

PIN NO.

SYMBOL

I/O

DESCRIPTION

HI2570, CXD2570