LTC1446 Linear Technology, LTC1446 Datasheet - Page 8

• Manufacturer Part Number: LTC1446
• Description: Dual 12-Bit Rail-to-Rail Micropower DACs in SO-8
• Manufacturer: Linear Technology

OPERATIO
LTC1446/LTC1446L
Serial Interface
The data on the D
on the rising edge of the clock. Data is loaded as one 24-
bit word where the first 12 bits are for DAC A and the
second 12 are for DAC B. For each 12-bit segment the MSB
is loaded first. Data from the shift register is loaded into the
DAC register when CS/LD is pulled high. The clock is
disabled internally when CS/LD is high. Note: CLK must be
low before CS/LD is pulled low to avoid an extra internal
clock pulse.
The buffered output of the 24-bit shift register is available
on the D
Multiple LTC1446/LTC1446L’s may be daisy-chained to-
gether by connecting the D
chip, while the clock and CS/LD signals remain common
to all chips in the daisy chain. The serial data is clocked to
all of the chips, then the CS/LD signal is pulled high to
update all of them simultaneously.
8
OUT
pin which swings from GND to V
IN
U
input is loaded into the shift register
OUT
pin to the D
IN
pin of the next
CC
.
Voltage Output
The LTC1446/LTC1446L include an internal voltage refer-
ence which is connected to each DAC. The LTC1446 has a
full scale of 4.095V making 1LSB equal to 1mV. The
LTC1446L has a full scale of 2.5V making 1LSB equal to
0.61mV.
The LTC1446/LTC1446L rail-to-rail buffered outputs can
source or sink 5mA when operating with a 5V supply while
pulling to within 300mV of the positive supply voltage or
ground. The outputs swing to within a few millivolts of
either supply rail when unloaded and have an equivalent
output resistance of 40 when driving a load to the rails.
The buffer amplifiers can drive 1000pF without going into
oscillation.