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LTC1401I Datasheet(PDF) 6 Page - Linear Technology

Part No. LTC1401I
Description  Complete SO-8, 12-Bit, 200ksps ADC with Shutdown
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LTC1401I Datasheet(HTML) 6 Page - Linear Technology

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6
LTC1401
PIN FUNCTIONS
VCC (Pin 1): Positive Supply, 3V. Bypass to GND (10µF
tantalum in parallel with 0.1
µF ceramic).
AIN (Pin 2): Analog Input. 0V to 2.048V.
VREF (Pin 3): 1.2V Reference Output. Bypass to GND
(10
µF tantalum in parallel with 0.1µF ceramic).
GND (Pin 4): Ground. GND should be tied directly to an
analog ground plane.
DOUT (Pin 5): The A/D conversion result is shifted out from
this pin.
LTC1401 • BD01
12-BIT CAPACITIVE DAC
COMP
SUCCESSIVE APPROXIMATION
REGISTER/PARALLEL TO
SERIAL CONVERTER
ZEROING SWITCH
CONTROL
LOGIC
1.20V REF
DOUT
VCC
CONV
CLK
VREF
AIN
CSAMPLE
12
GND
SHDN
FUNCTIONAL BLOCK DIAGRA
LTC1401 • TC01
DOUT
DOUT
3k
3k
CLOAD
CLOAD
Hi-Z TO VOH
VOL TO VOH
VOH TO Hi-Z
Hi-Z TO VOL
VOH TO VOL
VOL TO Hi-Z
3V
TEST CIRCUITS
CLK (Pin 6): Clock. This clock synchronizes the serial data
transfer. A minimum CLK pulse of 60ns signals the ADC to
wake up from Nap or Sleep mode.
CONV (Pin 7): Conversion Start Signal. This active high
signal starts a conversion on its rising edge. Keeping CLK
low and pulsing CONV two/four times will put the ADC into
Nap/Sleep mode.
SHDN (Pin 8): Shutdown Input. Pull this pin Low to put the
ADC in Shutdown mode and save power (REFRDY will go
Low). The device will draw 4.5
µA in this mode.


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