Datasheet

© 2010 Microchip Technology Inc. DS22187E-page 27
MCP4728
4.9 DAC Input Code Vs. DAC Analog
Output
Table 4-6 shows an example of the DAC input data
code vs. analog output. The MSB of the input data is
always transmitted first and the format is unipolar
binary.
TABLE 4-5: LDAC AND UDAC
CONDITIONS VS. OUTPUT
UPDATE
LDAC Pin UDAC Bit DAC Output (V
OUT
)
00Update all DAC channel
outputs
01Update all DAC channel
outputs
10Update a selected DAC
channel output
11No update
TABLE 4-6: DAC INPUT CODE VS. ANALOG OUTPUT (V
OUT
)
DAC Input Code
V
REF
= Internal (2.048 V) V
REF
= V
DD
Gain
Selection
Nominal Output Voltage (V)
(See Note 1)
Gain
Selection
Nominal Output Voltage (V)
111111111111 x1 V
REF
- 1 LSB Ignored V
DD
- 1 LSB
x2 2*V
REF
- 1 LSB
111111111110 x1 V
REF
- 2 LSB V
DD
- 2 LSB
x2 2*V
REF
- 2 LSB
000000000010 x1 2 LSB 2 LSB
x2 2 LSB
000000000001 x1 1 LSB 1 LSB
x2 1 LSB
000000000000 x1 0 0
x2 0
Note 1: (a) LSB with gain of 1 = 0.5 mV, and (b) LSB with gain of 2 = 1 mV.