LTC1662 Datasheet, PDF (1/12 Pages) Linear Technology – Ultralow Power, Dual 10-Bit DAC in MSOP

FEATURES
s _{Ultralow Power: 1.5µA (Typ) ICC per DAC Plus}
0.05µA Sleep Mode for Extended Battery Life
s _{Tiny: Two 10-Bit DACs in an 8-Lead MSOP—}
Half the Size of an SO-8
s _{Wide 2.7V to 5.5V Supply Range}
s _{Double Buffered for Simultaneous DAC Updates}
s _{Rail-to-Rail Voltage Outputs Drive 1000pF}
s _{Reference Range Includes Supply for Ratiometric}
0V-to-V_CC Output
s _{Reference Input Impedance Is Code-Independent}
(7.1MΩ Typ)—Eliminates External Buffers
s _{3-Wire Serial Interface with}
Schmitt Trigger Inputs
s _{Differential Nonlinearity: ±0.75LSB Max}
U
APPLICATIO S
s _{Mobile Communications}
s _{Portable Battery-Powered Instruments}
s _{Remote Industrial Devices}
s _{Digitally Controlled Amplifiers and Attenuators}
s _{Automatic Calibration for Manufacturing}
Final Electrical Specifications
LTC1662
Ultralow Power, Dual
10-Bit DAC in MSOP
DESCRIPTIO
March 2000
The LTC^®1662 is an ultralow power, fully buffered volt-
age output, dual 10-bit digital-to-analog converter (DAC).
Each DAC 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 a negli-
gible 0.05µA.
Linear Technology’s proprietary, inherently monotonic
voltage interpolation architecture provides excellent lin-
earity while allowing for an exceptionally small external
form factor. The double-buffered input logic provides
simultaneous update capability and can be used to write to
either DAC without interrupting Sleep mode.
With its ultralow operating current and exceptionally
small size, the LTC1662 is ideal for use in battery-
powered products.
The LTC1662 is pin- and software-compatible with the
LTC1661 micropower dual 10-bit DAC. It is available in
8-pin MSOP and PDIP packages and is specified over the
industrial temperature range.
, LTC and LT are registered trademarks of Linear Technology Corporation.
BLOCK DIAGRA
V_{OUT A}
GND
8
7
10-BIT
DAC A
V_CC
V_{OUT B}
6
5
10-BIT
DAC B
1
CS/LD
CONTROL
LOGIC
ADDRESS
DECODER
SHIFT REGISTER
2
3
SCK
D_IN
4
REF
1662 BD
Total Supply-Plus-Reference
Operating Current
5.5
V_REF = V_CC
5.0 ^TA ^{= 25°C}
4.5
CODE = 1023
4.0
CODE = 512
3.5
CODE = 0
3.0
2.5
2.5 3.0 3.5 4.0 4.5 5.0 5.5
V_CC (V)
1662 G01
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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