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LTC2636
1
2636fb
Block Diagram
Features
applications
Description
Octal 12-/10-/8-Bit SPI V
OUT
DACs with10ppm/°C Reference
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
also operate with an external reference, which sets the DAC
full-scale output to the external reference voltage.
These DACs communicate via an SPI/MICROWIRE-com-
patible 3-wire serial interface which operates at clock rates
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-scale in internal reference mode, or reset to mid-scale
in external reference mode after power-up.
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, 5859606, 6891433, 6937178, 7414561.
12-Bit Integral Nonlinearity
(LTC2636-LZ12)
n
Integrated Precision Reference
2.5V Full-Scale 10ppm/°C (LTC2636-L)
4.096V Full-Scale 10ppm/°C (LTC2636-H)
n
Maximum INL Error: 2.5LSB (LTC2636-12)
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
n
2.7V to 5.5V Supply Range (LTC2636-L)
n
UltralowCrosstalkBetweenDACs(<2.4nV•s)
n
Low Power: 0.9mA at 3V (LTC2636-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
2636 BD
GND
V
OUTA
V
OUTB
V
OUTC
V
OUTD
SCK
CS/LD
(LDAC)
REF
V
CC
V
OUTH
V
OUTG
V
OUTF
V
OUTE
SDI
(CLR)
INTERNAL REFERENCE
SWITCH
DAC A
CONTROL LOGIC
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
32-BIT SHIFT REGISTER
( ) MSOP PACKAGE ONLY
REGISTERREGISTERREGISTER
REGISTERREGISTERREGISTERREGISTER
REGISTERREGISTERREGISTERREGISTER
REGISTERREGISTERREGISTERREGISTER
CODE
0
INL (LSB)
2
1
0
–1
–2
1024 3072
2636 TA01
40952048
V
CC
= 3V
INTERNAL REF.
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