Datasheet > LTC2645

LTC2645

更新时间： 2024-09-22 01:08:11

品牌	Logo	应用领域
凌特 - Linear		/
页数	文件大小	规格书
20页	747K
描述
Dual 12-/10-/8-Bit PWM to VOUT DACs with 10ppm/Â°C Reference

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LTC2645 数据手册

LTC2644

Dual 12-/10-/8-Bit PWM

to V DACs with

OUT

10ppm/°C Reference

FeaTures

DescripTion

The LTC^®2644 is a family of dual 12-, 10-, and 8-bit PWM-

to-voltage output DACs with an integrated high accuracy,

lowdrift,10ppm/°Creferenceina12-leadMSOPpackage.It

hasrail-to-railoutputbuffersandisguaranteedmonotonic.

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

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.

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

The LTC2644 has a full-scale output of 2.5V using the

10ppm/°Cinternalreference.Itcanoperatewithanexternal

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.

applicaTions

Digital Calibration

Trimming and Adjustment

Level Setting

Process Control and Industrial Automation

Instrumentation

Automotive

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.

Typical applicaTion

2-Channel PWM to Voltage Output DAC

PWM Input to DAC Output

PWM INPUTS

BUFFERED

VOLTAGE

OUTPUTS

OUTA

2V/DIV

OUTB

LTC2644

INPUT: 1V TO 5.5V

OUTPUT: 1.25V

1.7V TO 5.5V

IOV

REF

0.1µF

2.7V TO 5.5V

0.1µF

OUTA

500mV/DIV

GND

IDLSEL

REFSEL

GND

0.1µF

2644 TA01a

2644TA01b

20µs/DIV

2644fa

For more information www.linear.com/LTC2644

12 3 4 5 6 7...20

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