LTC2657

1

2657f

BLOCK DIAGRAM

DESCRIPTION

Rail-to-Rail DACs with

10ppm/°C Max Reference

Rail DACs with Integrated 10ppm/°C Max Reference. The

DACs have built-in high performance, rail-to-rail, output

buffers and are guaranteed monotonic. The LTC2657-L has

a full-scale output of 2.5V with the integrated reference and

operates from a single 2.7V to 5.5V supply. The LTC2657-H

hasafull-scaleoutputof4.096Vwiththeintegratedreference

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

operate with an external reference, which sets the full-scale

output to 2 times the external reference voltage.

LTC2657 operates in both the standard mode (maximum

clock rate of 100kHz) and the fast mode (maximum clock

rate of 400kHz). The LTC2657 incorporates a power-on reset

circuitthatiscontrolledbythePORSELpin.IfPORSEListied

to GND the DACs reset to zero-scale at power-up. If PORSEL

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

trademarks are the property of their respective owners. Protected by U.S. Patents including

5396245, 6891433 and patent pending.

FEATURES

APPLICATIONS

× 5mm QFN and 20-Lead

Thermally enhanced TSSOP packages

INTERNAL REFERENCE

POWER-ON RESET

REFCOMP

REFIN/OUT

GND

DAC A

REF

DAC H

DAC G

DAC F

DAC E

PORSEL

SDA

SCL

REFLO

DAC B

DAC C

DAC D

CA2

LDAC

CA0

CA1

2-WIRE INTERFACE

32-BIT SHIFT REGISTER

2657 BD

INL vs Code (LTC2657-16)

CODE

128

0

1

2

65535

2657 TA01

–1

–2

–4

16384

32768

49152

–3

4

3

DAC A

DAC B

DAC C

DAC D

DAC E

DAC F

DAC G

DAC H