LTC1401 Linear Technology, LTC1401 Datasheet - Page 6

• Manufacturer Part Number: LTC1401
• Description: Complete SO-8/ 12-Bit/ 200ksps ADC with Shutdown
• Manufacturer: Linear Technology

FUNCTIONAL BLOCK DIAGRA
TEST CIRCUITS
LTC1401
PIN
V
tantalum in parallel with 0.1 F ceramic).
A
V
(10 F tantalum in parallel with 0.1 F ceramic).
GND (Pin 4): Ground. GND should be tied directly to an
analog ground plane.
D
this pin.
6
CC
IN
REF
OUT
U
U
(Pin 2): Analog Input. 0V to 2.048V.
(Pin 1): Positive Supply, 3V. Bypass to GND (10 F
(Pin 5): The A/D conversion result is shifted out from
(Pin 3): 1.2V Reference Output. Bypass to GND
FUNCTIONS
U
U
U
CONV
V
D
CLK
REF
A
OUT
IN
3k
Hi-Z TO V
V
V
CONTROL
OH
OL
LOGIC
1.20V REF
TO V
TO Hi-Z
OH
OH
C
LOAD
SUCCESSIVE APPROXIMATION
W
REGISTER/PARALLEL TO
12-BIT CAPACITIVE DAC
SERIAL CONVERTER
C
SAMPLE
12
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 A in this mode.
D
OUT
ZEROING SWITCH
Hi-Z TO V
COMP
V
V
OH
OL
3V
TO Hi-Z
TO V
3k
C
OL
OL
LOAD
LTC1401 • TC01
LTC1401 • BD01
V
GND
SHDN
D
CC
OUT