MAX11311 Datasheet, PDF (23/51 Pages) Maxim Integrated Products – PIXI, 12-Port Programmable Mixed-Signal I/O with 12-Bit ADC, 12-Bit DAC, Analog Switches, and GPIO

MAX11311
PIXI, 12-Port Programmable Mixed-Signal I/O with
12-Bit ADC, 12-Bit DAC, Analog Switches, and GPIO
SERIAL
INTERFACE
SPI
Figure 6. DAC Configuration
DAC_REF
INTERNAL OR
EXTERNAL FOR
ALL PORTS
DIGITAL
CORE
DAC
40µs to ±1 LSB
SEQUENCER
SCALING
BLOCK
PORT
0mA → 25mA
CURRENT LIMIT at
50mA
INT
SERIAL
INTERFACE
SPI
DAC_REF
INTERNAL OR EXTERNAL
FOR ALL PORTS
DIGITAL
CORE
DAC
SEQUENCER
CNVT
SCALING
BLOCK
PORT
ADC_INT_REF DAC_REF
REFERENCE
MUX
ADC
SCALING
BLOCK
SEQUENCER
INT
Figure 7. DAC Configuration with ADC Monitoring
DAC operations can be monitored by the ADC. In such a
mode, the ADC samples the DAC-configured port to allow
the host to monitor that the voltage at the port is within
expectations given the accuracy of the ADC and DAC.
This ADC monitoring mode is shown in Figure 7.
By default, the DAC updates the DAC-configured ports
sequentially. However, users can configure the DAC so that
its sequence can jump to update the port that just received
new data to convert. After having updated this port, the DAC
continues its default sequence from that port. In that mode,
users should allow a minimum of 80µs between DAC data
register updates for subsequent jump operations.
www.maximintegrated.com
Maxim Integrated │  23