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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
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-
ence 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 two times the external reference voltage.
These DACs communicate via a SPI/MICROWIRE
™
com-
patible 4-wire serial interface which operates at clock rates
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
tied to V
CC
, the DACs reset to mid-scale.
REGISTER
REGISTER
INTERNAL REFERENCE
REGISTER
REGISTER
REGISTER
REGISTER
REGISTER
REGISTER
REGISTER
REGISTER
REGISTER
REGISTER
REGISTER
REGISTER
REGISTER
REGISTER
DECODECONTROL LOGIC
POWER-ON RESET
32-BIT SHIFT REGISTER
REFCOMP REFIN/OUT
V
CC
GND
DAC A
REF
REF
REF
REF
REF
REF
REF
REF
DAC H V
OUTH
DAC G V
OUTG
DAC F V
OUTF
DAC E V
OUTE
PORSEL
SDO
SDI
2656 TA01a
CLR
REFLO
V
OUTA
DAC B
V
OUTB
DAC C
V
OUTC
DAC D
V
OUTD
SCK
LDAC
CS/LD
CODE
128
INL (LSB)
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.
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