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LTC2631
1
2631fb
BLOCK DIAGRAM
FEATURES
APPLICATIONS
DESCRIPTION
Single 12-/10-/8-Bit I
2
C
V
OUT
DACs with
10ppm/°C Reference
The LTC
®
2631 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 LTC2631-L has a full-scale output of 2.5V, and oper-
ates from a single 2.7V to 5.5V supply. The LTC2631-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 LTC2631 DACs use a 2-wire, I
2
C-compatible serial
interface. The LTC2631 operates in both the standard
mode (clock rate of 100kHz) and the fast mode (clock
rate of 400kHz).
The LTC2631 incorporates a power-on reset circuit. Op-
tions are available for reset to zero-scale or reset to mid-
scale after power-up.
Integral Nonlinearity (LTC2631A-LM12)
n
Integrated Precision Reference
2.5V Full-Scale 10ppm/°C (LTC2631-L)
4.096V Full-Scale 10ppm/°C (LTC2631-H)
n
Maximum INL Error: 1LSB (LTC2631A-12)
n
Bidirectional Reference: Input or 10ppm/°C Output
n
400kHz I
2
C™ Interface
n
Nine Selectable Addresses (LTC2631-Z)
n
Low Noise (0.7mV
P-P
, 0.1Hz to 200kHz)
n
Guaranteed Monotonic Over Temperature
n
2.7V to 5.5V Supply Range (LTC2631-L)
n
Low Power Operation: 180µA at 3V
n
Power Down to 1.8µA Maximum (C and I Grades)
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
n
Mobile Communications
n
Process Control and Industrial Automation
n
Automatic Test Equipment
n
Portable Equipment
n
Automotive
n
Optical Networking
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. I
2
C and
ThinSOT are 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 and 7414561.
(LTC2631-M)
DAC
REGISTER
RESISTOR
DIVIDER
INTERNAL
REFERENCE
INPUT
REGISTER
I
2
C
INTERFACE
DAC
V
OUT
SWITCH
CONTROL
DECODE LOGIC
SDA
V
CC
REF
GND
DACREF
2631 TA01
SCL
CA0
REF_SEL
I
2
C
ADDRESS
DECODE
CODE
0
INL (LSB)
0
0.5
4095
2631 TA01b
–0.5
–1.0
1024
2048
3072
1.0
V
CC
= 3V
V
FS
= 2.5V
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