LTC1661 Datasheet, PDF (1/12 Pages) Linear Technology – Micropower Dual 10-Bit DAC in MSOP

FEATURES
s _{Tiny: Two 10-Bit DACs in an 8-Lead MSOP—}
Half the Board Space of an SO-8
s _{Micropower: 60µA per DAC}
Sleep Mode: 1µA for Extended Battery Life
s _{Rail-to-Rail Voltage Outputs Drive 1000pF}
s _{Wide 2.7V to 5.5V Supply Range}
s _{Double Buffered for Independent or Simultaneous}
DAC Updates
s _{Reference Range Includes Supply for Ratiometric}
0V-to-V_CC Output
s _{Reference Input Has Constant Impedance over All}
Codes (260kΩ 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 _{Digitally Controlled Amplifiers and Attenuators}
s _{Portable Battery-Powered Instruments}
s _{Automatic Calibration for Manufacturing}
s _{Remote Industrial Devices}
, LTC and LT are registered trademarks of Linear Technology Corporation.
BLOCK DIAGRA
V_{OUT A}
GND
8
7
10-BIT
DAC A
1
CS/LD
CONTROL
LOGIC
ADDRESS
DECODER
SHIFT REGISTER
2
SCK
LTC1661
Micropower Dual
10-Bit DAC in MSOP
DESCRIPTIO
The LTC^®1661 integrates two accurate, serially addres-
sable, 10-bit digital-to-analog converters (DACs) in a
single tiny MS8 package. Each buffered DAC draws just
60µA total supply current, yet is capable of supplying DC
output currents in excess of 5mA and reliably driving
capacitive loads up to 1000pF. Sleep mode further re-
duces total supply current to a negligible 1µA.
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.
Ultralow supply current, power-saving Sleep mode and
extremely compact size make the LTC1661 ideal for
battery-powered applications, while its straightforward
usability, high performance and wide supply range make
it an excellent choice as a general purpose converter.
For additional outputs and even greater board density,
please refer to the LTC1660 micropower octal DAC for
10-bit applications. For 8-bit applications, please consult
the LTC1665 micropower octal DAC.
V_CC
V_{OUT B}
6
5
10-BIT
DAC B
3
4
D_IN
REF
1661 BD
Differential Nonlinearity (DNL)
0.75
0.60
0.40
0.20
0
–0.20
–0.40
–0.60
–0.75
0
256
512
768
1023
CODE
1661 G02
1