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
asingle2.7Vto5.5Vsupplyandareguaranteedmonotonic
over temperature. The LTC2641-16/LTC2642-16 provide
16-bit performance ( 2LꢀS ꢁIL and 1LꢀS DILN over
temperature. UnbufferedDACoutputsresultinlowsupply
current of 120μA and a low offset error of 1LꢀS.
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Tiny 3mm × 3mm 8-Pin DFN Package
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Maximum 16-Bit INL Error: ±±LꢀB oꢁer Temperature
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Low 1±0μA ꢀupply Current
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Guaranteed Monotonic oꢁer Temperature
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Low 0.5nV•sec Glitch Impulse
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2.7V to 5.5V ꢀingle ꢀupply Operation
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Fast 1μs ꢀettling Time to 16 Sits
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Unbuffered Voltage Output Directly Drives 60k Loads
Soth the LTC2641 and LTC2642 feature a reference input
50MHz ꢀPꢁTM/QꢀPꢁTM/MꢁCROWꢁRETM Compatible
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range of 2V to V . V
swings from 0V to V . For
DD OUT
REF
ꢀerial ꢁnterface
bipolar operation, the LTC2642 includes matched scaling
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Power-On Reset Clears DAC Output to Zero ꢀcale
resistors for use with an external precision op amp (such
(LTC2641N or Midscale (LTC2642N
as the LT1678N, generating a V output swing at R .
REF
FS
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ꢀchmitt-Trigger ꢁnputs for Direct Optocoupler
The LTC2641/LTC2642 use a simple ꢀPꢁ/MꢁCROWꢁRE
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 (LTC2641N
or midscale (LTC2642N. These DACs are all specified over
the commercial and industrial ranges.
ꢁnterface
Asynchronous CLR Pin
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⎯
⎯
⎯
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8-Lead MꢀOP and 3mm × 3mm DFI Packages
(LTC2641N
10-Lead MꢀOP and 3mm × 3mm DFI Packages
(LTC2642N
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⎯
⎯
⎯
APPLICATIONS
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High Resolution Offset and Gain Adjustment
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Process Control and ꢁndustrial Automation
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
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Automatic Test Equipment
Data Aquisition ꢀystems
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TYPICAL APPLICATION
Bipolar 16-Bit DAC
LTC±64±-16 Integral Nonlinearity
V
REF
2.7V TO 5.5V
2V TO V
DD
0.1μF
1μF
0.1μF
1.0
V
V
= 5V
REF
DD
0.8
0.6
= 2.5V
R
REF
V
FB
DD
LTC2642
2.5V RANGE
5pF
–
0.4
INV
0.2
BIPOLAR V
OUT
REF
1/2 LT1678
+
–V
TO V
REF
V
0
OUT
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
16384
65535
16-BIT SHIFT REGISTER
GND
26412 TA01a
LT1372 • G10
26412f
1