MAX5816 Datasheet, PDF (27/32 Pages) Maxim Integrated Products – Ultra-Small, Quad-Channel, 12-Bit Buffered Output DAC with Internal Reference and I2C Interface

MAX5816
Ultra-Small, Quad-Channel, 12-Bit Buffered Output DAC
with Internal Reference and I²C Interface
CONFIG Command
The CONFIG command allows independent configurations of the DAC. In normal mode (0), the DAC latch is operational
and responds to LOAD commands. In transparent mode (1), the DAC latch is transparent and CODE register contents
are supplied directly to the DAC outputs. See Table 11.
Table 11. CONFIG Command Format
B23 B22 B21 B20 B19 B18 B17 B16 B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0
0 X 1 1 0 X X X X X X X D CBAX X X XDCBA
CONFIG
Command
Don’t Care
Don’t Care
Don’t Care
DAC Latch Mode
0 = Operational
1 = Transparent
Data Default Value ➝
Command Byte
X X X X X XXXXXXX0000
Data High Byte
Data Low Byte
REF Command
The REF command updates the global reference setting used for all DAC channels. Set B[1:0] = 00 to use an external
reference for the DACs or set B[1:0] to 01, 10, or 11 to select either the 2.500V, 2.048V, or 4.096V internal reference,
respectively.
If RF2 (B2 = 0) is set to zero (default) in the REF command, the reference will be powered down any time all DAC chan-
nels are powered down (in STANDBY mode). If RF2 is set to one, the reference will remain powered even if all DAC
channels are powered down, allowing continued operation of external circuitry. In this mode the 1µA shutdown state is
not available. See Table 12.
Table 12. REF Command Format
B23 B22 B21 B20 B19 B18 B17 B16 B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0
0 X 1 1 1 X X X X X X X X X X X X X X X X RF2 RF1 RF0
REF Command Don’t Care
Don’t Care
Don’t Care
REF
Mode:
00 = Ext
01 =
2.500V
10 =
2.048V
11 =
4.096V
Data Default Value ➝
Command Byte
X X X X X XXXXXXXX 0
Data High Byte
Data Low Byte
00
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