LTC2656
Octal 16-/12-Bit Rail-to-Rail
DACs with 10ppm/°C
Max Reference
FEATURES
DESCRIPTION
The LTC®2656 is a family of octal 16-/12-bit rail-to-rail
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.
n
Precision 10ppm/°C Max Reference
n
Maximum INL Error: 4LSꢀ at 16 ꢀits
n
Guaranteed Monotonic over Temperature
n
Selectable Internal or External Reference
n
2.7V to 5.5V Supply Range (LTC2656-L)
n
Integrated Reference ꢀuffers
n
Ultralow Crosstalk ꢀetween DACs(<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
™
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
APPLICATIONS
n
Mobile Communications
n
Process Control and Industrial Automation
n
tied to V , the DACs reset to mid-scale.
Instrumentation
Automatic Test Equipment
CC
n
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.
n
Automotive
BLOCK DIAGRAM
REFCOMP
REFIN/OUT
INTERNAL REFERENCE
REF
REF
GND
V
CC
REFLO
V
DAC A
REF
DAC H
REF
V
V
V
V
OUTA
OUTH
OUTG
OUTF
OUTE
INL vs Code
4
3
V
OUTꢀ
DAC G
REF
2
DAC ꢀ
REF
1
0
–1
–2
–3
–4
V
OUTC
DAC C
REF
DAC F
REF
DAC A
DAC ꢀ
DAC C
DAC D
DAC E
DAC F
DAC G
DAC H
128
16384
32768
CODE
49152
65535
V
OUTD
DAC E
DAC D
2656 TA01
POWER-ON RESET
PORSEL
SDO
CS/LD
CONTROL LOGIC
DECODE
SCK
SDI
32-ꢀIT SHIFT REGISTER
CLR
LDAC
2656 ꢀD
2656f
1