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LTC1454/LTC1454L
Dual 12-Bit Rail-to-Rail
Micropower DACs
Daisy-Chained Control Outputs
Functional Block Diagram: Dual 12-Bit Rail-to-Rail DAC
X1/X2 B
X1/X2 A
DIN
CLK
DOUT
VCC
POWER-ON
RESET
–
+
12-BIT
DAC A
12-BIT
DAC B
REFOUT
CS/LD
VOUT B
REFHI B
REFHI A
REFLO
GND
14
16
1
11
8
7
12
2
6
5
3
4
9, 15
LTC1454: 5V
LTC1454L: 3V TO 5V
LTC1454: 2.048V
LTC1454L: 1.22V
10
13
VOUT A
–
+
CLR
1454 BD02
24-BIT
SHIFT
REG
AND
DAC
LATCH
P
Differential Nonlinearity
vs Input Code
CODE
0
DNL
ERROR
(LSB)
0.5
0.4
0.3
0.2
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
1024
2048 2560
1454 G08
512
1536
3072 3584 4095
FEATURES
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12-Bit Resolution
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Buffered True Rail-to-Rail Voltage Output
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5V Operation, ICC: 700A Typ (LTC1454)
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3V Operation, ICC: 450A Typ (LTC1454L)
s
Built-In Reference: 2.048V (LTC1454)
1.220V (LTC1454L)
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CLR Pin
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Power-On Reset
s
16-Lead SO Package
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3-Wire Cascadable Serial Interface
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Maximum DNL Error: 0.5LSB
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Low Cost
The LTC
1454/LTC1454L are complete single supply,
dual rail-to-rail voltage output, 12-bit digital-to-analog
converters (DACs) in a 16-lead SO package. They include
an output buffer amplifier with variable gain (
×1 or ×2)
and an easy-to-use 3-wire cascadable serial interface.
The LTC1454 has an onboard reference of 2.048V and a
full-scale output of 4.095V in a
×2 gain configuration. It
operates from a single 4.5V to 5.5V supply.
The LTC1454L has an onboard 1.22V reference and a full-
scale output of 2.5V in a
×2 gain configuration. It operates
from a single 2.7V to 5.5V supply.
Low power supply current, excellent DNL and small size
allow these parts to be used in a host of applications where
size, DNL and single supply operation are important.
DESCRIPTION
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APPLICATIONS
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Digital Calibration
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Industrial Process Control
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Automatic Test Equipment
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Cellular Telephones
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
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