WM5620 데이터 시트보기 (PDF) - Wolfson Microelectronics plc
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WM5620 Datasheet PDF : 14 Pages
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Functional Description (Continued)
Using these inputs individual DACs can be updated using
one 11 bit serial input word and the LOAD pin. Using both
LOAD and LDAC, all or selected DACs can be updated
after an appropriate number of data words have been
inputted. Figures 3 & 4 illustrate operation with the 8 clock
pulses available from some microprocessors. If the data
input is interrupted in this way the clock input must be
held low during the break in clock pulses.
Serial Input Decode
A1
A0
DAC
0
0
DACA
0
1
DACB
1
0
DACC
1
1
DACD
WM5620L, WM5620
The RNG bit controls the DAC output range. When RNG
= 0 the output is between Vref(A,B,C,D) and GND and
when RNG = 1 the range is between 2 x Vref (A,B,C,D)
and GND.
D7
D6
D5
D4
D3
D2
0
0
0
0
0
0
0
0
0
0
0
0
•
•
•
•
•
•
•
•
•
•
•
•
0
1
1
1
1
1
1
0
0
0
0
0
•
•
•
•
•
•
•
•
•
•
•
•
1
1
1
1
1
1
D1
D0
Output Voltage
0
0
GND
0
1
(1/256) x Ref (1 + RNG)
•
•
•
•
•
•
1
1
(127/256) x Ref (1 + RNG)
0
0
(128/256) x Ref (1 + RNG)
•
•
•
•
•
•
1
1
(255/256) x Ref (1 + RNG)
Wolfson Microelectronics
11
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