MB88346L

3

■ PIN DESCRIPTION

Pin No.

Symbol

I/O

Function

17

DI

I

Serial address/data input to the internal 12-bit shift register : The ad-

dress/data format is that upper 4 bits (D11 to D8) indicate an address

and lower 8 bits (D7 to D0) indicate data. The D11 (MSB) is the first-

in bit and D0 (LSB) is the last-in bit.

14

DO

O

Outputs MSB bit data from 12-bit shift register.

16

CLK

I

Shift clock input to the internal 12-bit shift register : At the rising edge

of CLK data on the DI pin is shifted into the LSB of the shift register

and contents of the shift register are shifted right (to the MSB) .

15

LD

I

Load strobe input for a 12-bit address/data : A high level on the LD pin

latches a 4-bit address (upper 4 bits : D11 to D8) of the internal 12-bit

shift register into the internal address decoder, and writes 8-bit data

(lower 8 bits : D7 to D0) of the shift register into an internal data latch

selected by the latched address.

18

19

2

3

4

5

6

7

8

9

12

13

O

8-bit D/A output pins with OP amps.

11

⎯

MCU interface and OP amp power supply pin.

20

GND

⎯

MCU interface and OP amp ground pin.

10

⎯

D/A converter power supply pin.

⎯

D/A converter ground pin.