LTC2641/LTC2642
16-/14-/12-Bit V DACs in
OUT
3mm × 3mm DFN
FEATURES
DESCRIPTION
The LTC®2641/LTC2642 are families of 16-, 14- and 12-bit
unbufferedvoltageoutputDACs.TheseDACsoperatefrom
a single 2.7V to 5.5V supply and are guaranteed mono-
tonic over temperature. The LTC2641A-16/LTC2642A-16
provide 16-bit performance ( 1LSB INL and 1LSB DNL)
over temperature. Unbuffered DAC outputs result in low
supply current of 120µA and a low offset error of 1LSB.
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Tiny 3mm × 3mm 8-Pin DFN Package
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Maximum 16-Bit INL Error: 1LSB over Temperature
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Low 120µA Supply Current
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Guaranteed Monotonic over Temperature
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Low 0.5nV•sec Glitch Impulse
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2.7V to 5.5V Single Supply Operation
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Fast 1µs Settling Time to 16 Bits
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Unbuffered Voltage Output Directly Drives 60k Loads
Both the LTC2641 and LTC2642 feature a reference input
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50MHz SPI/QSPI/MICROWIRE Compatible
range of 2V to V . V
swings from 0V to V . For
DD OUT
REF
Serial Interface
bipolar operation, the LTC2642 includes matched scaling
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Power-On Reset Clears DAC Output to Zero Scale
resistors for use with an external precision op amp (such
(LTC2641) or Midscale (LTC2642)
as the LT1678), generating a V output swing at R .
REF
FB
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Schmitt-Trigger Inputs for Direct Optocoupler
The LTC2641/LTC2642 use a simple SPI/MICROWIRE
compatible 3-wire serial interface which can be operated
at clock rates up to 50MHz and can interface directly
with optocouplers for applications requiring isolation. A
power-on reset circuit clears the LTC2641’s DAC output
to zero scale and the LTC2642’s DAC output to midscale
when power is initially applied. A logic low on the CLR pin
asynchronously clears the DAC to zero scale (LTC2641)
or midscale (LTC2642). These DACs are all specified over
the commercial and industrial ranges.
Interface
Asynchronous CLR Pin
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8-Lead MSOP and 3mm × 3mm DFN Packages
(LTC2641)
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10-Lead MSOP and 3mm × 3mm DFN Packages
(LTC2642)
APPLICATIONS
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High Resolution Offset and Gain Adjustment
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Process Control and Industrial Automation
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
SoftSpan is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
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Automatic Test Equipment
Data Acquisition Systems
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TYPICAL APPLICATION
Bipolar 16-Bit DAC
LTC2642-16 Integral Nonlinearity
V
REF
2.7V TO 5.5V
2V TO V
DD
0.1µF
1µF
0.1µF
1.0
V
V
= 5V
DD
REF
2.5V RANꢀE
0.8
0.6
= 2.5V
R
FB
REF
V
DD
LTC2642
5pF
–
INV
0.4
0.2
BIPOLAR V
REF
OUT
TO V
1/2 LT1678
+
–V
REF
V
OUT
0
16-BIT DAC
POWER-ON
RESET
–0.2
–0.4
–0.6
–0.8
–1.0
INL 25°C
INL 90°C
INL –45°C
CS
16-BIT DATA LATCH
SCLK
DIN
CLR
CONTROL
LOGIC
0
32768
CODE
49152
16-BIT SHIFT REGISTER
16384
65535
GND
26412 TA01a
26412 TA01b
26412fd
1
For more information www.linear.com/LTC2641