LTC2636 Datasheet, PDF (1/24 Pages) Linear Technology – Octal 12-/10-/8-Bit SPI VOUT DACs with10ppm/°C Reference

LTC2636
Octal 12-/10-/8-Bit SPI V_OUT
DACs with10ppm/°C Reference
FEATURES
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: 0.75mVP-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 _{Ultralow Crosstalk Between DACs (<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
APPLICATIONS
n _{Mobile Communications}
n _{Process Control and Industrial Automation}
n _{Automatic Test Equipment}
n _{Portable Equipment}
n _Automotive
n _{Optical Networking}
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
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 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.
BLOCK DIAGRAM
INTERNAL REFERENCE
GND
V_OUTA
V_REF
V_OUTB
V_REF
V_OUTC
V_REF
V_OUTD
CS/LD
SCK
(LDAC)
DAC A
DAC B
DAC C
DAC D
CONTROL LOGIC
DECODE
32-BIT SHIFT REGISTER
( ) MSOP PACKAGE ONLY
SWITCH
V_REF
DAC H
DAC G
DAC F
DAC E
REF
V_CC
V_OUTH
V_REF
V_OUTG
V_REF
V_OUTF
V_REF
V_OUTE
SDI
POWER-ON RESET
(CLR)
2636 BD
12-Bit Integral Nonlinearity
(LTC2636-LZ12)
2
V_CC = 3V
INTERNAL REF.
1
0
–1
–2
0
1024
2048
CODE
3072
4095
2636 TA01
2636f
1