LTC1662
Ultralow Power, Dual
10-Bit DAC in MSOP
Features
Description
Ultralow Power: 1.5µA (Typ) I per DAC Plus
The LTC®1662 is an ultralow power, fully buffered voltage
output,dual10-bitdigital-to-analogconverter(DAC).Each
DAC channel draws just 1.7µA (typ) total supply-plus-
reference operating current, yet is capable of supplying
DC output currents in excess of 1mA and reliably driving
capacitive loads of up to 1000pF. A programmable sleep
mode further reduces total operating current to 0.05µA.
n
CC
0.05µA Sleep Mode for Extended Battery Life
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Tiny: Two 10-Bit DACs in an 8-Lead MSOP—
Half the Size of an SO-8
Wide 2.7V to 5.5V Supply Range
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Double Buffered for Simultaneous DAC Updates
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Rail-to-Rail Voltage Outputs Drive 1000pF
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Reference Range Includes Supply for Ratiometric
Linear Technology’s proprietary, inherently monotonic
architecture provides excellent linearity and an exception-
ally small external form factor. The double-buffered input
logic provides simultaneous update capability and can be
usedtowritetotheDACswithoutinterruptingsleepmode.
0V to V Output
CC
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Reference Input Impedance Is Code-Independent
(7.1MΩ Typ)—Eliminates External Buffers
3-Wire Serial Interface with Schmitt Trigger Inputs
Differential Nonlinearity: 0.75LSB Max
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With its tiny operating current and exceptionally small
size, the LTC1662 is ideal for use in the most power-
constrained products. For most designs, there is no
perceptible impact on the power budget; the LTC1662
draws many times less current than even a trimpot,
while providing buffered, low impedance (0.5Ω typical,
applications
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Mobile Communications
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Portable Battery-Powered Instruments
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Remote or Inaccessible Adjustments
V
= 5V) rail-to-rail outputs.
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CC
Digitally Controlled Amplifiers and Attenuators
Factory or Field Calibration
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The LTC1662 is pin and software compatible with the
LTC1661 dual, 60µA 10-bit DAC. It is available in 8-pin
MSOP and PDIP packages and is specified over the in-
dustrial temperature range.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Block Diagram
V
GND
7
V
V
OUT A
CC
OUT B
5
Total Supply-Plus-Reference
Operating Current
8
6
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
5.5V
4.5V
10-BIT
DAC A
10-BIT
DAC B
3.6V
V
= 2.7V
CC
CONTROL
LOGIC
ADDRESS
DECODER
V
= V
CC
REF
CODE = 1023
SHIFT REGISTER
–55 –35 –15
5
25 45 65 85 105 125
TEMPERATURE (°C)
1662 TA01b
1662 BD
1
2
3
4
CS/LD
SCK
SDI
REF
1662fa
1