LTC2636

1

2636f

BLOCK DIAGRAM

FEATURES

APPLICATIONS

DESCRIPTION

DACs with10ppm/°C Reference

voltage-output DACs with an integrated, high-accuracy,

low-drift 10ppm/°C reference in 14-lead DFN and 16-lead

MSOP packages. It has a rail-to-rail output buffer and is

guaranteed monotonic. The LTC2636-L has a full-scale

output of 2.5V, and operates from a single 2.7V to 5.5V

supply. The LTC2636-H has a full-scale output of 4.096V,

and operates from a 4.5V to 5.5V supply. Each DAC can

also operate with an external reference, which sets the DAC

full-scale output to the external reference voltage.

These DACs communicate via an SPI/MICROWIRE™-com-

patible 3-wire serial interface which operates at clock rates

up to 50MHz. Hardware clear (CLR) and asynchronous

DAC update (LDAC) pins are available in the MSOP pack-

age. The LTC2636 incorporates a power-on reset circuit.

Options are available for reset to zero-scale or reset to

mid-scale in internal reference mode, or reset to mid-scale

in external reference mode after power-up.

12-Bit Integral Nonlinearity

(LTC2636-LZ12)

2.5V Full-Scale 10ppm/°C (LTC2636-L)

4.096V Full-Scale 10ppm/°C (LTC2636-H)

Temperature Range

× 3mm DFN and 16-Lead MSOP

Packages

L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

SPI/MICROWIRE is a trademark of Linear Technology Corporation. All other trademarks are the

property of their respective owners. Protected by U.S. Patents including 5396245, 5859606,

6891433, 6937178, 7414561.

2636 BD

GND

SCK

CS/LD

(LDAC)

REF

SDI

(CLR)

INTERNAL REFERENCE

SWITCH

DAC A

CONTROL LOGIC

DECODE

POWER-ON RESET

DAC B

DAC C

DAC D

DAC H

DAC G

DAC F

DAC E

32-BIT SHIFT REGISTER

( ) MSOP PACKAGE ONLY

CODE

0

2

1

0

–1

–2

1024

3072

2636 TA01

4095

2048

INTERNAL REF.