LTC2641 Datasheet, PDF (1/20 Pages) Linear Technology – 16-/14-/12-Bit VOUT DACs in 3mm × 3mm DFN

LTC2641/LTC2642
16-/14-/12-Bit V_OUT DACs in
3mm × 3mm DFN
FEATURES
■ _{Tiny 3mm × 3mm 8-Pin DFN Package}
■ _{Maximum 16-Bit INL Error: ±2LSB 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}^TM_/QSPI^TM_/MICROWIRE^TM _Compatible
Serial Interface
■ _{Power-On Reset Clears DAC Output to Zero Scale}
(LTC2641) or Midscale (LTC2642)
■ _{Schmitt-Trigger Inputs for Direct Optocoupler}
Interface
■ _Asynchronous ⎯_C⎯_L⎯_{R Pin}
■ _{8-Lead MSOP and 3mm × 3mm DFN Packages}
(LTC2641)
■ _{10-Lead MSOP and 3mm × 3mm DFN Packages}
(LTC2642)
APPLICATIONS
■ _{High Resolution Offset and Gain Adjustment}
■ _{Process Control and Industrial Automation}
■ _{Automatic Test Equipment}
■ _{Data Aquisition Systems}
DESCRIPTION
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 LTC2641-16/LTC2642-16 provide
16-bit performance (±2LSB INL and ±1LSB DNL) over
temperature. Unbuffered DAC outputs result in low supply
current of 120μA and a low offset error of ±1LSB.
Both the LTC2641 and LTC2642 feature a reference input
range of 2V to V_DD. V_OUT swings from 0V to V_REF. For
bipolar operation, the LTC2642 includes matched scaling
resistors for use with an external precision op amp (such
as the LT1678), generating a ±V_REF output swing at R_FB.
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 ^⎯C^⎯L^⎯R pin
asynchronously clears the DAC to zero scale (LTC2641)
or midscale (LTC2642). These DACs are all specified over
the commercial and industrial ranges.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
2.7V TO 5.5V
Bipolar 16-Bit DAC
0.1μF
V_REF
1μF
0.1μF ^{2V TO VDD}
LTC2642 ^VDD
REF
R_FB
INV
5pF _–
POWER-ON
RESET
16-BIT DAC
V_OUT
1/2 LT1678
+
CS
SCLK
DIN
CLR
CONTROL
LOGIC
16-BIT DATA LATCH
16-BIT SHIFT REGISTER
GND
26412 TA01a
BIPOLAR V_OUT
–V_REF TO V_REF
LTC2642-16 Integral Nonlinearity
1.0
0.8
V_DD = 5V
V_REF = 2.5V
0.6 ^{±2.5V RANGE}
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
0
16384
32768
CODE
INL 25°C
INL 90°C
INL –45°C
49152 65535
LT1372 • G10
26412f
1