dac1008 National Semiconductor Corporation, dac1008 Datasheet - Page 15

• Manufacturer Part Number: dac1008
• Description: Up Compatible, Double-buffered D To A Converters
• Manufacturer: National Semiconductor Corporation

6 2 1 Automatic Transfer
This makes use of a double byte (double precision) write
The first byte (8 bits) is strobed into the input latch and the
second byte causes a simultaneous strobe of the two re-
maining bits into the input latch and also the transfer of the
complete 10-bit word from the input latch to the DAC regis-
ter This is shown in the following timing diagram the point
in time where the analog output is updated is also indicated
on this diagram
6 2 2 Transfer Using mP Write Stroke
The input latch is loaded with the first two write strobes The
XFER signal is provided by external logic as shown below
to cause the transfer to be accomplished on a third write
strobe This is shown in the following diagram
SIGNIFIES CONTROL INPUTS WHICH ARE DRIVEN IN PARALLEL
DAC1006 1007 1008 (20-Pin Parts)
DAC1006 1007 1008 (20-Pin Parts)
TL H 5688 – 18
TL H 5688 – 19
15
6 2 3 Transfer Using an External Strobe
This is similar to the previous operation except the XFER
signal is not provided by the mP The timing diagram for this
is
6 3 Interfacing to a 16-Bit Data Bus
The interface to a 16-bit data bus is easily handled by con-
necting to 10 of the available bus lines This allows a wiring
selected right justified or left justified data format This is
shown in the connection diagram of Figure 17 where the
use of DB6 to DB15 gives left justified data operation Note
that any part number can be used and the Byte1 Byte2 con-
trol should be wired Hi
DAC1006 1007 1008 (20-Pin Parts)
TL H 5688 – 20