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LTC2632
1
2632fa
BLOCK DIAGRAM
FEATURES DESCRIPTION
Dual 12-/10-/8-Bit SPI
V
OUT
DACs with
10ppm/°C Reference
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.
Integral Nonlinearity (LTC2632A-LZ12)
APPLICATIONS
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: 0.75mV
P-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
n
Mobile Communications
n
Process Control and Industrial Automation
n
Automatic Test Equipment
n
Portable Equipment
n
Automotive
CODE
0
INL (LSB)
2
1
0
–1
–2
1024 3072
2632 TA01
40952048
V
CC
= 3V
INTERNAL REF.
REGISTER
INTERNAL
REFERENCE
REGISTER
REGISTER
POWER-ON
RESET
32-BIT SHIFT REGISTER
REGISTER
CONTROL
LOGIC
DECODE
SCK
REF
V
REF
2632 BD
CS/LD
SDI
V
OUTA
V
CC
V
OUTB
DAC A
DAC B
SWITCH
GND
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