LTC1454CS Linear Technology, LTC1454CS Datasheet - Page 8

• Manufacturer Part Number: LTC1454CS
• Description: IC D/A CONV 12BIT R-R DUAL16SOIC
• Manufacturer: Linear Technology

Specifications of LTC1454CS

• Settling Time: 14µs
• Number Of Bits: 12
• Data Interface: Serial
• Number Of Converters: 2
• Voltage Supply Source: Single Supply
• Power Dissipation (max): 3.5mW
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

LTC1454/LTC1454L
OPERATIO
Serial Interface
The data on the D
on the rising edge of the clock. Data is loaded as one 24-bit
word, DAC A first, then DAC B. The MSB is loaded first for
each DAC. The DAC registers load the data from the shift
register when CS/LD is pulled high. The CLK 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 LTC1454/LTC1454Ls may be daisy-chained to-
gether by connecting the D
chip, while the CLK 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 ground to V
U
IN
input is loaded into the shift register
OUT
pin to the D
IN
pin of the next
CC
.
Reference
The LTC1454L has an internal reference of 1.22V with a full
scale of 2.5V (gain of 2 configuration). The LTC1454
includes an internal 2.048V reference, making 1LSB equal
to 1mV (gain of 2 configuration). When the buffer gain is
2, the external reference must be less than V
capable of driving the 15k minimum DAC resistor ladder.
With a gain of 1 configuration the external reference must
be less than V
Voltage Output
The rail-to-rail buffered output of the LTC1454 family can
source or sink 5mA when operating with a 5V supply while
pulling to within 300mV of the positive supply voltage or
ground. The output swings to within a few millivolts of
either supply rail when unloaded and has an equivalent
output resistance of 40 when driving a load to the rails.
The output can drive 1000pF without going into oscilla-
tion.
CC
– 1.5V.
CC
/2 and be