LTC1419ACSW datasheet(6/20 Pages) LINER

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LTC1419

1419fb

CONVST (Pin 23): Conversion Start Signal. This active

low signal starts a conversion on its falling edge.

CS (Pin 24): Chip Select. The input must be low for the

ADC to recognize CONVST and RD inputs. CS also sets

the shutdown mode when SHDN goes low. CS and

SHDN low select the quick wake-up nap mode. CS high

and SHDN low select sleep mode.

BUSY (Pin 25): The BUSY output shows the converter

status. It is low when a conversion is in progress. Data

valid on the rising edge of BUSY.

VSS (Pin 26): – 5V Negative Supply. Bypass to AGND

with 10

µF tantalum in parallel with 0.1µF or 10µF

ceramic.

DVDD (Pin 27): 5V Positive Supply. Short to Pin 28.

AVDD (Pin 28): 5V Positive Supply. Bypass to AGND

with 10

µF tantalum in parallel with 0.1µF or 10µF

ceramic.

+AIN (Pin 1): ±2.5V Positive Analog Input.

–AIN (Pin 2): ±2.5V Negative Analog Input.

VREF (Pin 3): 2.5V Reference Output. Bypass to AGND

with 1

µF.

REFCOMP (Pin 4): 4.06V Reference Output. Bypass to

AGND with 10

µF tantalum in parallel with 0.1µF or 10µF

ceramic.

AGND (Pin 5): Analog Ground.

D13 to D6 (Pins 6 to 13): Three-State Data Outputs. The

output format is 2’s complement.

DGND (Pin 14): Digital Ground for Internal Logic. Tie to

AGND.

D5 to D0 (Pins 15 to 20): Three-State Data Outputs. The

output format is 2’s complement.

SHDN (Pin 21): Power Shutdown Input. Low selects

shutdown. Shutdown mode selected by CS. CS = 0 for

nap mode and CS = 1 for sleep mode.

RD (Pin 22): Read Input. This enables the output

drivers when CS is low.

14-BIT CAPACITIVE DAC

COMP

REF AMP

2.5V REF

REFCOMP

(4.096V)

CSAMPLE

•

D13

BUSY

CONTROL LOGIC

CONVST

SHDN

INTERNAL

CLOCK

ZEROING SWITCHES

DVDD

VSS

AVDD

+AIN

–AIN

VREF

AGND

DGND

1419 BD

–

SUCCESSIVE APPROXIMATION

OUTPUT LATCHES

FU CTIO AL BLOCK DIAGRA

PI FU CTIO S

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