The MAX509/MAX510 are quad, serial-input, 8-bit voltage-
output digital-to-analog converters (DACs). They
operate with a single +5V supply or dual ±5V supplies.
Internal, precision buffers swing rail-to-rail. The reference
input range includes both supply rails.
The MAX509 has four separate reference inputs, allowing
each DAC's full-scale range to be set independently.
20-pin DIP, SSOP, and SO packages are available. The
MAX510 is identical to the MAX509 except it has two reference
inputs, each shared by two DACs. The MAX510
is housed in space-saving 16-pin DIP and SO packages.
The serial interface is double-buffered: A 12-bit input
shift register is followed by four 8-bit buffer registers and
four 8-bit DAC registers. A 12-bit serial word is used to
load data into each register. Both input and DAC registers
can be updated independently or simultaneously
with single software commands. Two additional asynchronous
control pins provide simultaneous updating
(LDAC) or clearing (CLR) of input and DAC registers.
The interface is compatible with MicrowireTM and SPI/
QSPITM. All digital inputs and outputs are TTL/CMOS
compatible. A buffered data output provides for readback
or daisy-chaining of serial devices.