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Linear Technology Electronic Components Datasheet

LTC1661 Datasheet

Micropower Dual 10-Bit DAC in MSOP

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LTC1661 pdf
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-VCC Output
s Reference Input Has Constant Impedance over All
Codes (260kTyp)—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
VOUT A
8
GND
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.
VCC VOUT B
65
10-BIT
DAC B
34
DIN 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


Linear Technology Electronic Components Datasheet

LTC1661 Datasheet

Micropower Dual 10-Bit DAC in MSOP

No Preview Available !

LTC1661 pdf
LTC1661
ABSOLUTE AXI U RATI GS
(Note 1)
VCC to GND .............................................. – 0.3V to 7.5V
Logic Inputs to GND ................................ – 0.3V to 7.5V
VOUT A, VOUT B, REF to GND ............ – 0.3V to VCC + 0.3V
Maximum Junction Temperature ......................... 125°C
Storage Temperature Range ................ – 65°C to 150°C
Operating Temperature Range
LTC1661C ............................................. 0°C to 70°C
LTC1661I ........................................... – 40°C to 85°C
Lead Temperature (Soldering, 10 sec)................ 300°C
PACKAGE/ORDER I FOR ATIO
TOP VIEW
CS/LD 1
SCK 2
DIN 3
REF 4
8 VOUT A
7 GND
6 VCC
5 VOUT B
MS8 PACKAGE
8-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 150°C/W
Consult factory for Military grade parts.
ORDER PART
NUMBER
LTC1661CMS8
LTC1661IMS8
MS8 PART MARKING
LTDV
LTDW
TOP VIEW
CS/LD 1
SCK 2
DIN 3
REF 4
8 VOUT A
7 GND
6 VCC
5 VOUT B
N8 PACKAGE
8-LEAD PLASTIC DIP
TJMAX = 125°C, θJA = 100°C/W
ORDER PART
NUMBER
LTC1661CN8
LTC1661IN8
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 2.7V to 5.5V, VREF VCC, VOUT Unloaded unless otherwise noted.
SYMBOL PARAMETER
Accuracy
Resolution
Monotonicity
DNL Differential Nonlinearity
INL Integral Nonlinearity
VOS Offset Error
VOS Temperature Coefficient
FSE Full-Scale Error
Full-Scale Error Temperature Coefficient
PSR Power Supply Rejection
Reference Input
Input Voltage Range
Resistance
Capacitance
IREF Reference Current
Power Supply
VCC Positive Supply Voltage
ICC Supply Current
CONDITIONS
1V VREF VCC – 0.1V (Note 2)
1V VREF VCC – 0.1V (Note 2)
1V VREF VCC – 0.1V (Note 2)
Measured at Code 20
VCC = 5V, VREF = 4.096V
VREF = 2.5V
Active Mode
Sleep Mode
For Specified Performance
VCC = 5V (Note 3)
VCC = 3V (Note 3)
Sleep Mode (Note 3)
MIN
q 10
q 10
q
q
q
q
q0
q 140
q
q
q 2.7
q
q
q
TYP MAX UNITS
Bits
Bits
±0.1 ±0.75 LSB
±0.4 ±2 LSB
±5 ±30 mV
±15 µV/°C
±1 ±12 LSB
±30 µV/°C
0.18 LSB/V
260
15
0.001
VCC
1
V
k
pF
µA
5.5
120 195
95 154
13
V
µA
µA
µA
2


Part Number LTC1661
Description Micropower Dual 10-Bit DAC in MSOP
Maker Linear Technology
Total Page 12 Pages
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