LTC2636
Octal 12-/10-/8-Bit SPI V
OUT
DACs with10ppm/°C Reference
FEATURES
DESCRIPTION
The LTC®2636 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 LTC2636-L has a full-scale
output of 2.5V, and operates from a single 2.7V to 5.5V
supply. The LTC2636-H has a full-scale output of 4.096V,
and operates from a 4.5V to 5.5V supply. Each DAC can
alsooperatewithanexternalreference,whichsetstheDAC
full-scale output to the external reference voltage.
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Integrated Precision Reference
2.5V Full-Scale 10ppm/°C (LTC2636-L)
4.096V Full-Scale 10ppm/°C (LTC2636-H)
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Maximum INL Error: 2.5LSB (LTC2636-12)
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Low Noise: 0.75mV 0.1Hz to 200KHz
P-P
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Guaranteed Monotonic Over –40°C to 125°C
Temperature Range
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Selectable Internal or External Reference
2.7V to 5.5V Supply Range (LTC2636-L)
Ultralow Crosstalk Between DACs (<2.4nV•s)
Low Power: 0.9mA at 3V (LTC2636-L)
Power-On-Reset to Zero-Scale/Mid-Scale
Double-Buffered Data Latches
TheseDACscommunicateviaanSPI/MICROWIRE™-com-
patible3-wireserialinterfacewhichoperatesatclockrates
up to 50MHz. Hardware clear (CLR) and asynchronous
DAC update (LDAC) pins are available in the MSOP pack-
age. The LTC2636 incorporates a power-on reset circuit.
Options are available for reset to zero-scale or reset to
mid-scaleininternalreferencemode,orresettomid-scale
in external reference mode after power-up.
Tiny 14-Lead 4mm × 3mm DFN and 16-Lead MSOP
Packages
APPLICATIONS
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Mobile Communications
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Process Control and Industrial Automation
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L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
SPI/MICROWIRE 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.
Automatic Test Equipment
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Portable Equipment
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Automotive
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Optical Networking
BLOCK DIAGRAM
SWITCH
REF
INTERNAL REFERENCE
V
REF
GND
V
V
CC
12-Bit Integral Nonlinearity
(LTC2636-LZ12)
V
DAC A
DAC B
DAC C
DAC H
DAC G
DAC F
DAC E
OUTA
OUTH
2
1
V
= 3V
CC
INTERNAL REF.
V
V
V
V
REF
REF
REF
REF
V
OUTB
OUTC
V
OUTG
V
0
V
V
V
OUTF
V
OUTE
–1
–2
V
REF
REF
DAC D
OUTD
0
1024
2048
3072
4095
CODE
2636 TA01
CS/LD
SDI
CONTROL LOGIC
DECODE
SCK
(CLR)
(LDAC)
32-BIT SHIFT REGISTER
POWER-ON RESET
2636 BD
( ) MSOP PACKAGE ONLY
2636f
1