LC89080 Datasheet, PDF (5/8 Pages) Sanyo Semicon Device – Video Signal 3-Channel 8-Bit D/A Converter

LC89080, 89080Q
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
IOB) and the output current is converted to a voltage by the output resistor (R_O) to acquire the analog output. The table
shows the ideal relationship between the digital input and the analog output when V_REFIN is 1 V.
Digital input code
D1
D8
MSB
D2
D3
D4
D5
D6
D7
LSB
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
1
0
Analog output voltage
IO
(positive output)
IOB
(negative output)
0
0.996
0.004
0.992
0.008
0.988
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0.496
0.500
0.500
0.496
1
1
1
1
1
1
0
1
1
1
1
1
1
1
1
0
1
1
1
1
1
1
1
1
Sample Application Circuit: LC89080
0.988
0.992
0.996
0.008
0.004
0
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