LTC1446/LTC1446L
Dual 12-Bit Rail-to-Rail
Micropower DACs in SO-8
FEATURES
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DESCRIPTIO
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Dual DACs with 12-Bit Resolution
SO-8 Package
Rail-to-Rail Output Amplifiers
Internal Reference
Maximum DNL Error: 0.5LSB
3V Operation (LTC1446L): I
CC
= 650µA Typ
5V Operation (LTC1446): I
CC
= 1000µA Typ
Settling Time: 14µs to
±0.5LSB
Power-On Reset Clears DACs to 0V
3-Wire Cascadable Serial Interface with 500kHz
Update Rate
Schmitt Trigger On Input Allows Direct
Optocoupler Interface
Low Cost
The LTC
®
1446/LTC1446L are dual 12-bit digital-to-analog
converters (DACs) available in an SO-8 package. They are
complete with a rail-to-rail voltage output amplifier, an
internal reference and an easy-to-use 3-wire cascadable
serial interface.
The LTC1446 has an internal reference and a full-scale
output of 4.095V. It operates from a single 4.5V to 5.5V
supply.
The LTC1446L has an internal reference and a full-scale
output of 2.5V. It operates from a single 2.7V to 5.5V
supply.
The low power supply current makes the LTC1446 family
ideal for battery-powered applications. These DACs are
available in space saving 8-pin SO and PDIP packages and
require no external components for operation.
APPLICATIO S
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Digital Calibration
Industrial Process Control
Automatic Test Equipment
Cellular Telephones
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
Functional Block Diagram: Dual 12-Bit Rail-to-Rail DAC
7
V
CC
2 D
IN
LTC1446: 5V
LTC1446L: 3V TO 5V
+
12-BIT
DAC B
V
OUT B
8
1 CLK
3 CS/LD
24-BIT
SHIFT
REG
AND
DAC
LATCH
12-BIT
DAC A
4 D
OUT
POWER-ON
RESET
GND
6
1446/1446L TA01
DNL ERROR (LSB)
µP
–
RAIL-TO-RAIL
VOLTAGE
OUTPUT
+
–
V
OUT A
5
U
Differential Nonlinearity vs Input Code
0.5
0.4
0.3
0.2
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
0
512 1024 1536 2048 2560 3072 3584 4095
CODE
1446/46L G13
U
U
1
LINER [ LINEAR TECHNOLOGY ]
