MP7628
INTERFACE LOGIC INFORMATION
DAC Selection: All DAC latches share a common 8-bit input
port. The control inputs DS1, DS2, A/B select which DAC can
accept data from the input port.
Mode Selection: Inputs DS and R/W control the operating
mode of the selected DAC.
See Mode Selection Table on the
previous page.
Write Mode: When DS and R/W are both low the selected
DAC is in the write mode. The input data latches of the selected
DAC are transparent and its analog output responds to activity
on DB0-DB7.
Hold Mode: The selected DAC latch retains the data which
was present on DB0-DB7 just prior to DS and R/W assuming a
high state. Both analog outputs remain at the values corre-
sponding to the data in their respective latches.
Read Mode: When DS is low and R/W is high, the selected
DAC is in the read mode and the data held in the appropriate
latch is outputed to the data bus.
APPLICATION NOTES
Refer to Section 8 for Applications Information
Rev. 2.00
7
EXAR [ EXAR CORPORATION ]
