RESISTOR STRING
The resistor string section is shown in Figure 2. It is simply
a divide-by-2 resistor followed by a string of resistors. The
code loaded into the DAC register determines at which node
on the string the voltage is tapped off. This voltage is then
applied to the output amplifier by closing one of the switches
connecting the string to the amplifier.
OUTPUT AMPLIFIER
Each output buffer amplifier is capable of generating rail-torail voltages on its output which approaches an output range
of 0V to AVDD (gain and offset errors must be taken into
account). Each buffer is capable of driving a load of 2kΩ in
parallel with 1000pF to GND. The source and sink capabilities of the output amplifier can be seen in the typical characteristics.
SERIAL INTERFACE
The DAC8534 uses a 3-wire serial interface (SYNC, SCLK,
and DIN), which is compatible with SPI™, QSPI™, and
Microwire™ interface standards, as well as most DSPs. See
the Serial Write Operation timing diagram for an example of
a typical write sequence.