MAX1021 Datasheet, PDF (30/40 Pages) Maxim Integrated Products – 10-Bit, Multichannel ADCs/DACs with FIFO, Temperature Sensing, and GPIO Ports

10-Bit, Multichannel ADCs/DACs with FIFO,
Temperature Sensing, and GPIO Ports
Table 17. DAC Serial-Interface Configuration (continued)
MSB
CONTROL BITS
C3 C2 C1 C0 D9
1101—
1110
16-BIT SERIAL WORD
DATA BITS
D8 D7 D6 D5 D4 D3 D2 D1 D0
— ————————
XX
LSB
DESCRIPTION
FUNCTION
XX
XX
XX
DAC0–7
DAC0–7
D9–D0 to input registers 0–7
(MAX1021). D9–D0 to input
registers 0–3 (MAX1043). DAC
outputs unchanged.
Input registers to DAC registers
indicated by ones, DAC outputs
updated, equivalent to software
LDAC. (No effect on DACs
indicated by zeros.) DAC7–
DAC4 are only valid on the
MAX1021. These bits are don’t-
care bits for the MAX1043.
Table 18. DAC Power-Up and Power-Down Commands
CONTROL
BITS
C3 C2 C1 C0
DATA BITS
DESCRIPTION
D3 D2 D1 D0
FUNCTION
1 1 1 1 ———————— 0 0 1 X
Power-Up
Power up individual DAC buffers indicated by data
in DAC0 through DAC3. A one indicates the DAC
output is connected and active. A zero does not
affect the DAC’s present state.
Power down individual DAC buffers indicated by
1
1
1
1 ———————— 0
1
0
X
Power-Down 1
data in DAC0 through DAC3. A one indicates the
DAC output is disconnected and high impedance.
A zero does not affect the DAC’s present state.
Power down individual DAC buffers indicated by
data in DAC0 through DAC3. A one indicates the
1 1 1 1 — — — — — — — — 1 0 0 X Power-Down 2 DAC output is disconnected and pulled to AGND
with a 1kΩ resistor. A zero does not affect the DAC’s
present state.
Power down individual DAC buffers indicated by
data in DAC0 through DAC3. A one indicates the
1 1 1 1 — — — — — — — — 0 0 0 X Power-Down 3 DAC output is disconnected and pulled to AGND
with a 100kΩ resistor. A zero does not affect the
DAC’s present state.
Power down individual DAC buffers indicated by
data in DAC0 through DAC3. A one indicates the
1 1 1 1 — — — — — — — — 1 1 1 X Power-Down 4 DAC output is disconnected and pulled to REF1 with
a 100kΩ resistor. A zero does not affect the DAC’s
present state.
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