LTC2640_15 Datasheet, PDF (1/24 Pages) Linear Technology – Single 12-/10-/8-Bit SPI VOUT DACs with 10ppm/C Reference

Features
n _{Integrated Precision Reference}
2.5V Full-Scale 10ppm/°C (LTC2640-L)
4.096V Full-Scale 10ppm/°C (LTC2640-H)
n _{Maximum INL Error: 1LSB (LTC2640A-12)}
n _{Bidirectional Reference: Input or 10ppm/°C Output}
n _{Low Noise (0.7mVpp, 0.1Hz to 200kHz)}
n _{Guaranteed Monotonic Over Temperature}
n _{2.7V to 5.5V Supply Range (LTC2640-L)}
n _{Low Power Operation: 180µA at 3V}
n _{Power Down to 1.8µA Maximum (C and I Grades)}
n _{Asynchronous DAC Clear Pin (LTC2640-Z)}
n _{Power-On Reset to Zero or Mid-Scale options}
n _{Double-Buffered Data Latches}
n _{Guaranteed Operation from –40°C to 125°C (H-Grade)}
n _{8-Lead TSOT-23 (ThinSOT™) Package}
Applications
n _{Mobile Communications}
n _{Process Control and Industrial Automation}
n _{Automatic Test Equipment}
n _{Portable Equipment}
n _Automotive
n _{Optical Networking}
LTC2640
Single 12-/10-/8-Bit SPI
V_OUT DACs with
10ppm/°C Reference
Description
The LTC^®2640 is a family of 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 a rail-to-rail
output buffer that is guaranteed monotonic.
The LTC2640-L has a full-scale output of 2.5V, and operates
from a single 2.7V to 5.5V supply. The LTC2640-H has a
full-scale output of 4.096V, and operates from a 4.5V to
5.5V supply. A 10ppm/°C reference output is available at
the REF pin.
Each DAC can also operate in External Reference mode,
in which a voltage supplied to the REF pin sets the full-
scale output.
The LTC2640 DACs use a SPI/MICROWIRE™ compatible
3-wire serial interface which operates at clock rates up
to 50MHz.
The LTC2640 incorporates a power-on reset circuit. Op-
tions are available for Reset to Zero-Scale or Reset to
Mid-Scale after power-up.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
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,
6937178 and 7414561.
Block Diagram (LTC2640-Z)
V_CC
INTERNAL
SDI
REFERENCE
SCK
24-BIT
SHIFT
REGISTER
CS/LD
CONTROL
DECODE LOGIC
INPUT
REGISTER
DAC
REGISTER
REF
SWITCH
RESISTOR
DIVIDER
DACREF
DAC
V_OUT
CLR
GND
2640 TA01
For more information www.linear.com/LTC2640
Integral Nonlinearity (LTC2640A-LZ12)
1.0 _{VCC = 3V}
V_FS = 2.5V
0.5
0
–0.5
–1.0
0
1024
2048
CODE
3072
4095
2640 TA01b
2640fc
1