LC89080 Operation

The LC89080 and LC89080Q include three current-matrix D/A converters on chip. These D/A converters each have 63

basic current cells (with current weight I) and two weighted current cells (I/2 and I/4). These current cells are turned on

or off according to the input digital code (a binary code). The sum of these currents is output to the output pins (IO and

Sample Application Circuit: LC89080

No. 4030-5/8

LC89080, 89080Q

Digital input code

Analog output voltage

D1

D2

D3

D4

D5

D6

D7

D8

IO

IOB

MSB

LSB

(positive output)

(negative output)

0

0

0

0

0

0

0

0

0

0.996

0

0

0

0

0

0

0

1

0.004

0.992

0

0

0

0

0

0

1

0

0.008

0.988

0

1

1

1

1

1

1

1

0.496

0.500

1

0

0

0

0

0

0

0

0.500

0.496

1

1

1

1

1

1

0

1

0.988

0.008

1

1

1

1

1

1

1

0

0.992

0.004

1

1

1

1

1

1

1

1

0.996

0