LTC1446IS8 Datasheet, PDF (1/12 Pages) Linear Dimensions Semiconductor – Dual 12-Bit Rail-to-Rail Micropower DACs in SO-8

LTC1446/LTC1446L
Dual 12-Bit Rail-to-Rail
Micropower DACs in SO-8
FEATURES
s _{Dual DACs with 12-Bit Resolution}
s _{SO-8 Package}
s _{Rail-to-Rail Output Amplifiers}
s _{Internal Reference}
s _{Maximum DNL Error: 0.5LSB}
s _{3V Operation (LTC1446L): ICC = 650µA Typ}
s _{5V Operation (LTC1446): ICC = 1000µA Typ}
s _{Settling Time: 14µs to ±0.5LSB}
s _{Power-On Reset Clears DACs to 0V}
s _{3-Wire Cascadable Serial Interface with 500kHz}
Update Rate
s _{Schmitt Trigger On Input Allows Direct}
Optocoupler Interface
s _{Low Cost}
U
APPLICATIO S
s _{Digital Calibration}
s _{Industrial Process Control}
s _{Automatic Test Equipment}
s _{Cellular Telephones}
DESCRIPTIO
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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
Functional Block Diagram: Dual 12-Bit Rail-to-Rail DAC
LTC1446: 5V
7 LTC1446L: 3V TO 5V
V_CC
2 D_IN
µP
1 CLK
24-BIT
SHIFT
3 CS/LD _REG
AND
DAC
LATCH
4 D_OUT
12-BIT
DAC B
12-BIT
DAC A
+
V_{OUT B 8}
–
RAIL-TO-RAIL
VOLTAGE
OUTPUT
+
V_{OUT A 5}
–
POWER-ON
RESET
GND
6
1446/1446L TA01
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
1