LTC1446L| Datasheet

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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): ICC = 650uA Typ 5V Operation (LTC1446): ICC = 1000uA Typ Settling Time: 14us 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 VCC 2 DIN LTC1446: 5V LTC1446L: 3V TO 5V

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12-BIT DAC B

VOUT B 8

1 CLK 3 CS/LD 24-BIT SHIFT REG AND DAC LATCH 12-BIT DAC A 4 DOUT POWER-ON RESET GND 6
1446/1446L TA01

DNL ERROR (LSB)

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RAIL-TO-RAIL VOLTAGE OUTPUT

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VOUT A 5

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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

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LTC1446L DATASHEET