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LTC2637
1
2637fb
Octal 12-/10-/8-Bit I
2
C V
OUT
DACs with 10ppm/°C Reference
FEATURES
APPLICATIONS
DESCRIPTION
The LTC
®
2637 is a family of octal 12-, 10-, and 8-bit
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 LTC2637-L has a full-scale
output of 2.5V, and operates from a single 2.7V to 5.5V
supply. The LTC2637-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 a 2-wire I
2
C-compatible
serial interface. The LTC2637 operates in both the standard
mode (clock rate of 100kHz) and the fast mode (clock rate
of 400kHz). The LTC2637 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.
n
Integrated Precision Reference:
2.5V Full-Scale 10ppm/°C (LTC2637-L)
4.096V Full-Scale 10ppm/°C (LTC2637-H)
n
Maximum INL Error: 2.5LSB (LTC2637-12)
n
Low Noise: 0.75mV
P-P
0.1Hz to 200KHz
n
Guaranteed Monotonic Over –40°C to 125°C
Temperature Range
n
Selectable Internal or External Reference
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2.7V to 5.5V Supply Range (LTC2637-L)
n
Ultralow Crosstalk Between DACs (<3nV•s)
n
Low Power: 100µA per DAC at 3V (LTC2637-L)
n
Power-On-Reset to Zero-Scale/Mid-Scale
n
Double-Buffered Data Latches
n
Tiny 14-Lead 4mm × 3mm DFN and 16-Lead MSOP
Packages
n
Mobile Communications
n
Process Control and Industrial Automation
n
Automatic Test Equipment
n
Portable Equipment
n
Automotive
n
Optical Networking
BLOCK DIAGRAM
Integral Nonlinearity (LTC2637-LZ12)
2637 BD
GND
V
OUTA
V
OUTB
V
OUTC
V
OUTD
CAO
(CA1)
(CA2)
REF
V
CC
V
OUTH
V
OUTG
V
OUTF
V
OUTE
SCL
INTERNAL REFERENCE
SWITCH
DAC A
DECODE
POWER-ON RESET
V
REF
V
REF
V
REF
V
REF
V
REF
V
REF
V
REF
DAC B
DAC C
DAC D
DAC H
DAC G
DAC F
DAC E
REGISTER
I
2
C
ADDRESS
DECODE
( ) MSOP PACKAGE ONLY
REGISTERREGISTERREGISTER
REGISTERREGISTERREGISTERREGISTER
REGISTERREGISTERREGISTERREGISTER
REGISTERREGISTERREGISTERREGISTER
SDA
I
2
C INTERFACE
CODE
0
INL (LSB)
2
1
0
–1
–2
1024 3072
2637 TA01
40952048
V
CC
= 3V
INTERNAL REF.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT 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.
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