LTC2632_15 Datasheet, PDF (1/24 Pages) Linear Technology – Dual 12-/10-/8-Bit SPI VOUT DACs with 10ppm/C Reference

FEATURES
n _{Integrated Precision Reference}
2.5V Full-Scale 10ppm/°C (LTC2632-L)
4.096V Full-Scale 10ppm/°C (LTC2632-H)
n _{Maximum INL Error: ±1LSB (LTC2632A-12)}
n _{Low Noise: 0.75mVP-P 0.1Hz to 200kHz}
n _{Guaranteed Monotonic –40°C to 125°C Automotive}
Temperature Range
n _{Selectable Internal or External Reference}
n _{2.7V to 5.5V Supply Range (LTC2632-L)}
n _{Low Power Operation 0.4mA at 3V}
n _{Power-On-Reset to Zero-Scale/Mid-Scale}
n _{Double-Buffered Data Latches}
n _{8-Lead ThinSOT™ Package}
APPLICATIONS
n _{Mobile Communications}
n _{Process Control and Industrial Automation}
n _{Automatic Test Equipment}
n _{Portable Equipment}
n _Automotive
LTC2632
Dual 12-/10-/8-Bit SPI
V_OUT DACs with
10ppm/°C Reference
DESCRIPTION
The LTC^®2632 is a family of dual 12-, 10-, and 8-bit voltage-
output DACs with an integrated, high-accuracy, low-drift
reference in an 8-lead TSOT-23 package. It has rail-to-rail
output buffers and is guaranteed monotonic.
The LTC2632-L has a full-scale output of 2.5V, and operates
from a single 2.7V to 5.5V supply. The LTC2632-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.
These DACs communicate via a simple SPI/MICROWIRE
compatible 3-wire serial interface which operates at clock
rates up to 50MHz. The LTC2632 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. 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, and 6937178.
BLOCK DIAGRAM
GND
V_CC
V_OUTA
DAC A
INTERNAL
REFERENCE
REF
SWITCH
V_REF
DAC B
V_OUTB
CS/LD
SCK
CONTROL
LOGIC
DECODE
32-BIT SHIFT REGISTER
SDI
POWER-ON
RESET
2632 BD
Integral Nonlinearity (LTC2632A-LZ12)
2
V_CC = 3V
INTERNAL REF.
1
0
–1
–2
0
1024
2048
CODE
3072
4095
2632 TA01
2632fa
1