LTC2634
Quad 12-/10-/8-Bit
Rail-to-Rail DACs with
10ppm/°C Reference
FEATURES
DESCRIPTION
The LTC®2634 is a family of quad 12-, 10- and 8-bit volt-
age output DACs with an integrated, high accuracy, low
drift 10ppm/°C reference in 16-lead QFN and 10-lead
MSOP packages. It has rail-to-rail output buffers and is
guaranteed monotonic. The LTC2634-L has a full-scale
output of 2.5V, and operates from a single 2.7V to 5.5V
supply. The LTC2634-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
full-scale output to the external reference voltage.
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Integrated Precision Reference
2.5V Full-Scale 10ppm/°C (LTC2634-L)
4.096V Full-Scale 10ppm/°C (LTC2634-H)
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Maximum INL Error: 2.5 LSꢀ (LTC2634-12)
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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
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2.7V to 5.5V Supply Range (LTC2634-L)
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Ultralow Crosstalk ꢀetween DACs (2.4nV•s)
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Low Power: 0.6mA at 3V
TheseDACscommunicateviaanSPI/MICROWIREcompat-
ible 3-wire serial interface which operates at clock rates
up to 50MHz. Serial data output (SDO), a hardware clear
(CLR),andanasynchronousDACupdate(LDAC)capability
areavailableintheQFNpackage.TheLTC2634incorporates
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.
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Power-On Reset to Zero-Scale/Mid-Scale
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Double ꢀuffered Data Latches
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Tiny 16-Lead 3mm × 3mm QFN and 10-Lead
MSOP Packages
APPLICATIONS
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Mobile Communications
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Process Control and Industrial Automation
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Automatic Test Equipment
Portable Equipment
Automotive
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, 5859606, 6891433, 6937178, 7414561.
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BLOCK DIAGRAM
REF
INTERNAL
REFERENCE
GND
SWITCH
Integral Nonlinearity
V
REF
(LTC2634-LZ12)
V
(REFLO)
CC
2
V
= 3V
CC
INTERNAL REF
V
V
OUTA
OUTD
DAC A
DAC ꢀ
DAC D
DAC C
1
0
V
V
REF
REF
V
V
OUTC
OUTꢀ
SDI
CS/LD
SDI
–1
–2
CONTROL
LOGIC
DECODE
0
2048
3072
4095
1024
SCK
POWER-ON
RESET
32-ꢀIT SHIFT REGISTER
(CLR)
CODE
(SDO)
2634 TA01
(LDAC)
2634 ꢀD
( ) QFN PACKAGE ONLY
2634f
1