Datasheet

6
LTC1414
PIN FUNCTIONS
UUU
BUSY (Pin 25): The BUSY Output Shows the Converter
Status. It is low when a conversion is in progress.
V
SS
(Pin 26): –5V Negative Supply. Bypass to AGND with
10µF ceramic or 10µF tantalum in parallel with 0.1µF
ceramic.
AGND (Pin 27): Analog Ground.
AV
DD
(Pin 28): 5V Positive Supply. Bypass to AGND with
10µF ceramic or 10µF tantalum in parallel with 0.1µF
ceramic.
FUNCTIONAL BLOCK DIAGRA
UU
W
14-BIT CAPACITIVE DAC
COMPREF AMP
2.5V REF
2k
REFCOMP
(4.06V)
C
SAMPLE
C
SAMPLE
•
•
•
D13
D0
BUSY
CONTROL LOGIC
INTERNAL
CLOCK
CONVST
ZEROING SWITCHES
OV
DD
OGND
AV
DD
DV
DD
V
SS
A
IN
+
A
IN
–
V
REF
AGND
DGND
14
1414 BD
+
–
SUCCESSIVE APPROXIMATION
REGISTER
OUTPUT
LATCHES
TI I G DIAGRA
UWW
DATA (N – 1)
DB13 TO DB0
CONVST
BUSY
1414 TD
t
4
t
5
t
CONV
t
1
t
3
t
2
DATA N
DB13 TO DB0
DATA (N + 1)
DB13 TO DB0
DATA