dac1054 National Semiconductor Corporation, dac1054 Datasheet - Page 8

• Manufacturer Part Number: dac1054
• Description: Quad 10-bit Voltage-output Serial D/a Converter With Readback
• Manufacturer: National Semiconductor Corporation

Block Diagram
Pin Description
V
V
V
V
V
V
V
V
V
AGND(20)
DGND(5)
DV
AV
OUT1
OUT2
OUT3
OUT4
REF
BIAS1
BIAS2
BIAS3
BIAS4
CC
CC
OUT(21)
(4 6)
(19)
(2)
(23)
(17)
(13)
(3)
(24)
(16)
(15)
The voltage output connections of the
four DACS These provide output
voltages in the range 0 3V – 2 8V
The internal voltage reference output
The output of the reference is 2 65V
The non-inverting inputs of the 4 output
amplifiers These pins set the virtual
ground voltage for the respective DACs
The allowed range is 0 3V – 1 4V
The analog and digital ground pins
The digital and analog power supply
pins The power supply range of the
DAC1054 is 4 5V – 5 5V To guarantee
accuracy it is required that the AV
and DV
with bypass capacitors of 10 mF
tantalum in parallel with 0 1 mF ceramic
g
2%
CC
pins be bypassed separately
CC
8
AU(11)
V
V
V
V
CS(9)
CLK(8)
DI(10)
DO(7)
INT(12)
REF1
REF2
REF3
REF4
(1)
(22)
(18)
(14)
When this pin is taken low all DAC outputs
will be asynchronously updated CS must
be held high during the update AU must be
held high during Read back
The voltage reference inputs for the four
DACs The allowed range is 0V – 2 75V
The Chip Select control input This input is
active low
The external clock input pin
The serial data input The data is clocked in
MSB first Preceding the data byte are 4 or
6 bits of instructions The read back
command requires 7 bits of instructions
The serial data output The data can be
clocked out either MSB or LSB first and on
either the positive or negative edge of the
clock
The power interrupt output On an
interruption of the digital power supply this
pin goes low Since this pin has an open
drain output a 10 kX pull-up resistor must
be connected to the supply
TL H 11437 – 15