LTC1274 Linear Technology, LTC1274 Datasheet - Page 9

• Manufacturer Part Number: LTC1274
• Description: 12-Bit/ 10mW/ 100ksps ADCs with 1uA Shutdown
• Manufacturer: Linear Technology

BLOCK DIAGRA S
TEST CIRCUITS
DBN
A) HIGH-Z TO V
AND V
3k
Load Circuits for Access Timing
REFRDY
DGND
OL
AGND
DGND
REFRDY
V
DGND
TO V
AGND
A
REF
V
A
A
IN
REF
IN
IN
OH
+
–
OH
(t
9
(t
)
6
)
C
L
W
2.42V REF
INTERNAL
CLOCK
2.42V REF
INTERNAL
CLOCK
DBN
B) HIGH-Z TO V
SLEEP
AND V
HBEN
SUCCESSIVE APPROXIMATION
SUCCESSIVE APPROXIMATION
OH
5V
12-BIT CAPACITIVE DAC
CONVST
SLEEP
CONTROL LOGIC
12-BIT CAPACITIVE DAC
TO V
3k
DGND
CONTROL LOGIC
REGISTER
C
1274/77 • TC01
OL
L
REGISTER
NAP
OL
(t
9
(t
)
C
CONVST RD
6
LTC1274
SAMPLE
RD
)
C
SAMPLE
LTC1277
CS
CS
BUSY
BUSY
DBN
ZEROING SWITCHES
12
ZEROING SWITCHES
12
A) V
COMPARATOR
Load Circuits for Output Float Delay
3k
OUTPUT LATCHES
COMPARATOR
OH
OUTPUT LATCHES
DGND
3V OR 5V
TO HIGH-Z
V
LOGIC
LTC1274/LTC1277
10pF
LTC1274 • BD
LTC1277 • BD
•
•
•
•
•
•
•
•
D11
D0
V
V
(0V FOR UNIPOLAR MODE OR
–5V FOR BIPOLAR MODE)
DD
SS
D7
D1/9
D0/8
V
V
(0V FOR UNIPOLAR MODE OR
–5V FOR BIPOLAR MODE)
DBN
DD
SS
B) V
OL
TO HIGH-Z
5V
3k
DGND
10pF
1274/77 • TC02
9