LTC1277 Просмотр технического описания (PDF) - Linear Technology

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производитель

LTC1277

12-Bit, 10mW, 100ksps ADCs with 1µA Shutdown

Linear Technology 

LTC1274/LTC1277

BLOCK DIAGRA S

AIN

VREF

REFRDY

AGND

DGND

2.42V REF

INTERNAL

CLOCK

LTC1274

CSAMPLE

ZEROING SWITCHES

12-BIT CAPACITIVE DAC

COMPARATOR

VDD

VSS

(0V FOR UNIPOLAR MODE OR

–5V FOR BIPOLAR MODE)

12

SUCCESSIVE APPROXIMATION

REGISTER

CONTROL LOGIC

SLEEP CONVST RD

CS BUSY

OUTPUT LATCHES

•••

D11

D0

LTC1274 • BD

AIN+

AIN–

VREF

REFRDY

AGND

DGND

2.42V REF

LTC1277

CSAMPLE

ZEROING SWITCHES

12-BIT CAPACITIVE DAC

COMPARATOR

VDD

VSS

(0V FOR UNIPOLAR MODE OR

–5V FOR BIPOLAR MODE)

INTERNAL

CLOCK

12

SUCCESSIVE APPROXIMATION

REGISTER

CONTROL LOGIC

HBEN SLEEP NAP CONVST RD CS BUSY

OUTPUT LATCHES

•••••

D7

D1/9

D0/8

VLOGIC

3V OR 5V

LTC1277 • BD

TEST CIRCUITS

Load Circuits for Access Timing

5V

3k

DBN

DBN

3k

CL

CL

DGND

A) HIGH-Z TO VOH (t9)

AND VOL TO VOH (t6)

DGND

B) HIGH-Z TO VOL (t9)

AND VOH TO VOL (t6)

1274/77 • TC01

Load Circuits for Output Float Delay

5V

DBN

3k

DBN

10pF

3k

10pF

DGND

A) VOH TO HIGH-Z

DGND

B) VOL TO HIGH-Z

1274/77 • TC02

9

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