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LTC2644CMS-L8#TRPBF

Description
IC DAC 8-BIT VOUT 12MSOP
Categorysemiconductor    Analog mixed-signal IC   
File Size724KB,20 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Environmental Compliance
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LTC2644CMS-L8#TRPBF Overview

IC DAC 8-BIT VOUT 12MSOP

LTC2644CMS-L8#TRPBF Parametric

Parameter NameAttribute value
Number of digits8
Number of digital-to-analog converters2
Setup time7µs (standard)
Output typeVoltage - Buffered
Differential outputnone
Data interfacePWM
Reference typeoutside, inside
Voltage - Power, Analog2.7 V ~ 5.5 V
Voltage - Power, Digital2.7 V ~ 5.5 V
INL/DNL(LSB)±0.05, ±0.5 (maximum)
Architecture-
Operating temperature0°C ~ 70°C
Package/casing12-TSSOP (0.118", 3.00mm wide)
Supplier device packaging12-MSOP
LTC2644
Dual 12-/10-/8-Bit PWM
to V
OUT
DACs with
10ppm/°C Reference
FeaTures
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DescripTion
The
LTC
®
2644
is a family of dual 12-, 10-, and 8-bit PWM-
to-voltage output DACs with an integrated high accuracy,
low drift, 10ppm/°C reference in a 12-lead MSOP package. It
has rail-to-rail output buffers and is guaranteed monotonic.
The LTC2644 measures the period and pulse width of the
PWM input signals and updates the voltage output DACs
after each corresponding PWM input rising edge. The
DAC outputs update and settle to 12-bit accuracy within
8µs typically and are capable of sourcing and sinking up
to 5mA (3V) or 10mA (5V), eliminating voltage ripple and
replacing slow analog filters and buffer amplifiers.
The LTC2644 has a full-scale output of 2.5V using the
10ppm/°C internal reference. It can operate with an external
reference, which sets the full-scale output equal to the ex-
ternal reference voltage. Each DAC enters a pin-selectable
idle state when the PWM input is held unchanged for
more than 60ms. The part operates from a single 2.7V
to 5.5V supply and supports PWM input voltages from
1.71V to 5.5V.
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners. Protected by U.S. Patents, including 5396245, 5859606, 6891433,
6937178, 7414561.
No Latency PWM-to-Voltage Conversion
Voltage Output Updates and Settles within 8µs
100kHz to 30Hz PWM Input Frequency
±2.5LSB Max INL; ±1LSB Max DNL (LTC2644-12)
Guaranteed Monotonic
Pin-Selectable Internal or External Reference
2.7V to 5.5V Supply Range
1.71V to 5.5V Input Voltage Range
Low Power: 2.7mA at 3V, <1µA Power-Down
Guaranteed Operation from –40°C to 125°C
12-Lead MSOP Package
applicaTions
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Digital Calibration
Trimming and Adjustment
Level Setting
Process Control and Industrial Automation
Instrumentation
Automotive
Typical applicaTion
2-Channel PWM to Voltage Output DAC
PWM INPUTS
IN
A
IN
B
LTC2644
1.7V TO 5.5V
0.1µF
IOV
CC
PD
GND
REF
V
CC
IDLSEL
REFSEL
GND
2.7V TO 5.5V
0.1µF
0.1µF
V
OUTA
V
OUTB
BUFFERED
VOLTAGE
OUTPUTS
INPUT: 1V TO 5.5V
OUTPUT: 1.25V
V
OUTA
500mV/DIV
IN
A
2V/DIV
PWM Input to DAC Output
2644 TA01a
20µs/DIV
2644TA01b
2644fa
For more information
www.linear.com/LTC2644
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