Datasheet

MAX5703/MAX5704/MAX5705
Ultra-Small, Single-Channel, 8-/10-/12-Bit Buffered Output
Voltage DACs with Internal Reference and SPI Interface
21Maxim Integrated
Table 5. POWER (0100) Command Format
Table 6. Selectable DAC Output Impedance in Power-Down Mode
POWER Command
The MAX5703/MAX5704/MAX5705 feature a software-
controlled POWER mode command (B[23:20] = 0100).
In power-down, the DAC output is disconnected from
the buffer and is grounded with either one of the two
selectable internal resistors or set to high impedance.
See Table 5 and Table 6 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 powers up. The serial
interface remains active in power-down mode with all
registers accessible.
In power-down mode, the internal reference can be
powered down or it can be set to remain powered-on for
external use. Also, in power-down mode, parts using the
external reference do not load the REF pin. See Table 5.
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 X X X X X X X X X X X X PD1 PD0 X X X X X X
POWER
COMMAND
Don’t Care Don’t Care
Power
Mode:
00 =
Normal
01 = 1kI
10 =
100kI
11 = Hi-Z
Don’t Care
DEFAULT VALUES X X X X X X X X X X X X 0 0 X X X X X X
COMMAND BYTE DATA HIGH BYTE DATA LOW BYTE
PD1 (B7) PD0 (B6) 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.