LTC2641/LTC2642
16-/14-/12-Bit VOUT DACs in
3mm × 3mm DFN
Features
Description
Tiny 3mm × 3mm 8-Pin DFN Package
Maximum 16-Bit INL Error: ±1LSB over Temperature
Low 120µA Supply Current
Guaranteed Monotonic over Temperature
Low 0.5nV•sec Glitch Impulse
2.7V to 5.5V Single Supply Operation
Fast 1µs Settling Time to 16 Bits
Unbuffered Voltage Output Directly Drives 60k Loads
50MHz SPI/QSPI/MICROWIRE Compatible
Serial Interface
n Power-On Reset Clears DAC Output to Zero Scale
(LTC2641) or Midscale (LTC2642)
n Schmitt-Trigger Inputs for Direct Optocoupler
Interface
n Asynchronous CLR Pin
n 8-Lead MSOP and 3mm × 3mm DFN Packages
(LTC2641)
n 10-Lead MSOP and 3mm × 3mm DFN Packages
(LTC2642)
The LTC®2641/LTC2642 are families of 16-, 14- and 12‑bit
unbuffered voltage output DACs. These DACs operate from
a single 2.7V to 5.5V supply and are guaranteed monotonic 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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Applications
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High Resolution Offset and Gain Adjustment
Process Control and Industrial Automation
Automatic Test Equipment
Data Aquisition Systems
Both the LTC2641 and LTC2642 feature a reference input
range of 2V to VDD. VOUT swings from 0V to VREF . For
bipolar operation, the LTC2642 includes matched scaling
resistors for use with an external precision op amp (such
as the LT1678), generating a ±VREF output swing at RFB.
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.
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.
Typical Application
Bipolar 16-Bit DAC
REF
0.1µF
POWER-ON
RESET
CS
SCLK
DIN
CLR
VDD = 5V
VREF = 2.5V
±2.5V RANGE
0.8
RFB
INV
16-BIT DAC
1.0
0.6
5pF
1/2 LT1678
VOUT
0.4
BIPOLAR VOUT
–VREF TO VREF
INL (LSB)
VDD
1µF
+
LTC2642
0.1µF
LTC2642-16 Integral Nonlinearity
VREF
2V TO VDD
–
2.7V TO 5.5V
0.2
0
–0.2
–0.4
–0.6
CONTROL
LOGIC
16-BIT DATA LATCH
16-BIT SHIFT REGISTER
INL 25°C
INL 90°C
INL –45°C
–0.8
–1.0
GND
26412 TA01a
0
16384
32768
CODE
49152
65535
26412 TA01b
26412fc
For more information www.linear.com/LTC2641
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