Datasheet

MAX5813/MAX5814/MAX5815
Ultra-Small, Quad-Channel, 8-/10-/12-Bit Buffered
Output DACs with Internal Reference and I
2
C Interface
24Maxim Integrated
POWER Command
The MAX5813/MAX5814/MAX5815 feature a software-
controlled power-mode (POWER) command (B[23:20] =
0100). The POWER command updates the power-mode
settings of the selected DACs while the power settings of
the rest of the DACs remain unchanged. The new power
setting is determined by bits B[17:16] while the affected
DAC(s) are selected by bits B[11:8]. If all DACs are pow-
ered down, the device enters a STANDBY mode.
In power-down, the DAC output is disconnected from the
buffer and is grounded with either one of the two select-
able internal resistors or set to high impedance. See Table
8 for the selectable internal resistor values in power-down
mode. In power-down mode, the DAC register retains its
value so that the output is restored when the device pow-
ers up. The serial interface remains active in power-down
mode.
In STANDBY mode, the internal reference can be pow-
ered down or it can be set to remain powered-on for
external use. Also, in STANDBY mode, devices using the
external reference do not load the REF pin. See Table 7.
SW_RESET and SW_CLEAR Command
The SW_RESET (B[23:16] = 01010001) and SW_CLEAR
(B[23:16] = 01010000) commands provide a means of
issuing a software reset or software clear operation. Use
SW_CLEAR to issue a software clear operation to return
all CODE and DAC registers to the zero-scale value. Use
SW_RESET to reset all CODE, DAC, and configuration
registers to their default values.
Table 6. DAC Selection
Table 7. POWER (100) Command Format
Table 8. Selectable DAC Output Impedance in Power-Down Mode
B19 B18 B17 B16 DAC SELECTED
0 0 0 0 DAC A
0 0 0 1 DAC B
0 0 1 0 DAC C
0 0 1 1 DAC D
X 1 X X ALL DACs
1 X X X ALL DACs
PD1 (B17) PD0 (B16) OPERATING MODE
0 0 Normal operation
0 1
Power-down with internal 1kI pulldown resistor to GND.
1 0
Power-down with internal 100kI pulldown resistor to GND.
1 1 Power-down with high-impedance output.
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 1 0 0 0 0 PD1 PD0 X X X X D C B A X X X X X X X X
POWER Command
Power
Mode:
00 =
Normal
01 = 1kI
10 =
100kI
11 = Hi-Z
Don’t Care
DAC Select:
1 = DAC Selected
0 = DAC Not
Selected
Don’t Care
Default Values (all DACs) → 0 0 X X X X 1 1 1 1 X X X X X X X X