2645L8 View Datasheet(PDF) - Linear Technology

Part Name

Description

MFG CO.

2645L8

Quad 12-/10-/8-Bit PWM to VOUT DACs with 10ppm/°C Reference

Linear Technology 

LTC2645

Typical Application

5V

C3

0.1µF

C4

0.1µF

IOVCC VCC IDLSEL REFSEL REF

PD

LTC2645 -12

INA PWM TO

BINARY

DAC A

VOUTA

INB PWM TO

BINARY

DAC B

VOUTB

10k

VOUTB = Hi-Z

143k

0.1µF

INC PWM TO

BINARY

DAC C

VOUTC

VOUTC = Hi-Z

IND PWM TO

BINARY

DAC D

GND

VOUTD VOUTD = Hi-Z

FOR NO MARGINING, KEEP INA LOW. (VOUTA = Hi-Z)

TO MARGIN 10% HIGH, SET INA DUTY CYCLE TO 1/4096. (VOUTA = 0V)

TO MARGIN 10% LOW, SET INA DUTY CYCLE TO 2621/4096. (VOUTA = 1.6V)

0.1µF

2.2k

100k

0.1µF VIN PGOOD INTVCC

ILM LTC3850EUF TG1

10k

BOOST1

FREQ

SW1

1nF 3.32k

BG1

PGND

1nF

10k

ITH1

SENSE1+

500kHz

100pF

10nF

MODE/PLLIN

RUN1

TKSS1

SENSE1–

VFB1

SGND

CMDSH-3

4.7µF

VIN

6.5V

TO 14V

RJK0305DPB

0.1µF

2.2µH

0.008k

RJK0301DPB

VOUT

3.3V ±10%

10k

1nF

10k

15pF 63.4k

20k

2645 F05

Figure 5. Voltage Margining Application with LTC3850 (3.3V ±10%)

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PART NUMBER DESCRIPTION

COMMENTS

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3.8Hz to 1MHz Output Frequency Range, 0V to 1V Analog Input, < 1.7% Maximum

Frequency Error

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16-Pin 3mm × 3mm QFN and 10-Lead MSOP Packages

20 Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 950Fo3r5m-7o4re1i7nformation www.linear.com/LTC2645

(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com/LTC2645

2645f

LT 0714 • PRINTED IN USA

 LINEAR TECHNOLOGY CORPORATION 2014

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