LTC2656

1

2656fa

BLOCK DIAGRAM

FEATURES

APPLICATIONS

DESCRIPTION

Octal 16-/12-Bit Rail-to-Rail

DACs with 10ppm/°C

Max Reference

n

Mobile Communications

n

Process Control and Industrial Automation

n

Instrumentation

n

Automatic Test Equipment

n

Automotive

n

Precision 10ppm/°C Max Reference

n

Maximum INL Error: ±4LSB at 16 Bits

n

Guaranteed Monotonic over Temperature

n

Selectable Internal or External Reference

n

2.7V to 5.5V Supply Range (LTC2656-L)

n

Integrated Reference Buffers

n

UltralowCrosstalkBetweenDACs(<1nV•s)

n

Power-On-Reset to Zero-Scale/Mid-scale

n

Asynchronous LDAC Update Pin

n

Tiny 20-Lead 4mm × 5mm QFN and 20-Lead

Thermally Enhanced TSSOP Packages

DACs with a precision integrated reference. The DACs have

built-in high performance, rail-to-rail, output buffers and

are guaranteed monotonic. The LTC2656-L has a full-scale

output of 2.5V with the integrated 10ppm/°C reference and

operates from a single 2.7V to 5.5V supply. The LTC2656-H

has a full-scale output of 4.096V with the integrated refer-

enceandoperatesfroma4.5Vto5.5Vsupply.EachDACcan

also operate with an external reference, which sets the DAC

full-scaleoutputtotwotimestheexternalreferencevoltage.

These DACs communicate via a SPI/MICROWIRE™ com-

patible4-wireserialinterfacewhichoperatesatclockrates

up to 50MHz. The LTC2656 incorporates a power-on reset

circuit that is controlled by the PORSEL pin. If PORSEL

is tied to GND the DACs reset to zero-scale. If PORSEL is

INTERNAL REFERENCE

DECODE

CONTROL LOGIC

POWER-ON RESET

32-BIT SHIFT REGISTER

REFCOMP

REFIN/OUT

GND

DAC A

REF

REF

REF

REF

REF

REF

REF

REF

DAC H

DAC G

DAC F

DAC E

PORSEL

SDO

SDI

2656 TA01a

CLR

REFLO

DAC B

DAC C

DAC D

SCK

LDAC

CS/LD

CODE

128

0

1

2

65535

2656 TA01b

–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

INL vs Code

L

, LT, LTC, LTM, Linear Technology and the Linear logo 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.