LTC1669
10-Bit Rail-to-Rail
Micropower DAC with I2C Interface
U
DESCRIPTIO
FEATURES
The LTC®1669 is a 10-bit voltage output DAC with true
buffered rail-to-rail output voltage capability. It operates
from a single supply with a range of 2.7V to 5.5V. The
reference for the DAC is selectable between the supply
voltage or an internal bandgap reference. Selecting the
internal bandgap reference will set the full-scale output
voltage range to 2.5V. Selecting the supply as the refer-
ence sets the output voltage range to the supply voltage.
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Micropower 10-Bit DAC in SOT-23
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Low Operating Current: 60µA
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Ultralow Power Shutdown Mode: 12µA
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2-Wire Serial Interface Compatible
with I2CTM
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Selectable Internal Reference or Ratiometric to VCC
Maximum DNL Error: 0.75LSB
8 User Selectable Addresses (MSOP Package)
Single 2.7V to 5.5V Operation
Buffered True Rail-to-Rail Voltage Output
Power-On Reset
1.5V VIL and 2.1V VIH for SDA and SCL
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The part features a simple 2-wire serial interface compat-
ible with I2C that allows communication between many
devices. The internal data registers are double buffered to
allow for simultaneous update of several devices at once.
The DAC can be put in low current power-down mode for
use in power conscious systems.
Small 5-Lead SOUT-23 and 8-Lead MSOP Packages
APPLICATIO S
Power-on reset ensures the DAC output is at 0V when
power is initially applied, and all internal registers are
cleared. The LTC1669 is pin-for-pin compatible with the
LTC1663.
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Digital Calibration
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Offset/Gain Adjustment
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Industrial Process Control
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Automatic Test Equipment
, LTC and LT are registered trademarks of Linear Technology Corporation.
I2C is a trademark of Philips Electronics N.V.
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Arbitrary Function Generators
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Battery-Powered Data Conversion Products
W
BLOCK DIAGRA
4 (5)
V
CC
BANDGAP
1.25V
Differential Nonlinearity (DNL)
REFERENCE
1.0
V
REF
= V = 5V
CC
0.8
0.6
REFERENCE
SELECT
T
A
= 25°C
0.4
0.2
10-BIT
DAC LATCH
0
–0.2
–0.4
–0.6
–0.8
–1.0
V
3 (8)
OUT
10-BIT BUFFERED V
DAC
OUT
COMMAND
LATCH
INPUT
LATCH
MSOP
PACKAGE
ONLY
(6)
(2)
(3)
AD0
AD1
AD2
0
768 896
1024
28 156 384 512 640
CODE
2-WIRE INTERFACE
1669 G02
SDA
SCL
GND
2 (7)
1669 BD
1 (1)
5 (4)
NOTE: PIN NUMBERS IN PARENTHESES REFER TO THE MSOP PACKAGE
1669f
1