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 

Timing DiagramS

LTC2645

INX

VOUTX

tPWH

tPWL

tPER

t3

tS

VOUT = (tPWH/tPER) • VREF

IDLE STATE

2645 TD01a

t4

Figure 1a.

SAMPLE #1

tPWH1

INX

tPER1

VOUTX

t4

HOLD #1

SAMPLE #2

tPWH2

HOLD #2

tHOLD1 > t3

tPWL < t3 tPER2

VOUT1 = (tPWH1/tPER1)*VREF

t4

VOUT2 = (tPWH2/tPER2)*VREF

2645 TD01b

Figure 1b. Sample/Hold Operation (IDLSEL = VCC)

SAMPLE #1

tPWH1

INX

tPER1

VOUTX

t4

SAMPLE #2

tPWH2

tIDLE(LOW) ≥ t3

tPER2

tIDLE(HIGH) ≥ t3

VOUT1 = (tPWH1/tPER1) • VREF

IDLE STATE

TIMEOUT

LOW

VOUT = GND

t4

VOUT2 = (tPWH2/tPER2) • VREF

Figure 1c. Transparent Operation (IDLSEL = GND)

VOUT = VREF

IDLE STATE

TIMEOUT

HIGH

2645 TD01c

For more information www.linear.com/LTC2645

2645f

13

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