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1446I Datasheet(PDF) 8 Page - Linear Technology

Part # 1446I
Description  Dual 12-Bit Rail-to-Rail Micropower DACs in SO-8
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

1446I Datasheet(HTML) 8 Page - Linear Technology

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LTC1446/LTC1446L
Serial Interface
The data on the DIN input is loaded into the shift register
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 DOUT pin which swings from GND to VCC.
Multiple LTC1446/LTC1446L’s may be daisy-chained to-
gether by connecting the DOUT pin to the DIN pin of the next
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.
OPERATIO
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
Ω when driving a load to the rails.
The buffer amplifiers can drive 1000pF without going into
oscillation. The output noise spectral density is
600nV/
√Hz at 1kHz.


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