LTC1275 LINER [Linear Technology], LTC1275 Datasheet - Page 9

• Manufacturer Part Number: LTC1275
• Description: 12-Bit, 300ksps Sampling A/D Converters with Reference
• Manufacturer: LINER [Linear Technology]

FU TIO AL BLOCK DIAGRA
PI
V
Bypass to AGND with 0.1 F ceramic.
NC (Pin 23): No Connection for LTC1273.
Table 1. Data Bus Output, CS and RD = LOW
*D11...D0/8 are the ADC data output pins.
TEST CIRCUITS
MNEMONIC*
HBEN = LOW
HBEN = HIGH
DB11...DB0 are the 12-bit conversion results, DB11 is the MSB.
SS
U
DBN
U
(Pin 23): Negative Supply. – 5V for LTC1275/LTC1276.
FU
A) HIGH-Z TO V
U
AND V
U
3k
C
DGND
TI
Load Circuits for Access Time
OL
TO V
O
OH
Pin 4
DB11
DB11
V
D11
OH
REF(OUT)
U
(t
3
(t
)
6
S
)
A
C
IN
L
DB10
DB10
Pin 5
D10
REFERENCE
SAMPLE
2.42V
HOLD
DBN
Pin 6
DB9
DB9
D9
C
B) HIGH-Z TO V
SAMPLE
AND V
AGND
CAPACITIVE
OH
5V
12-BIT
Pin 7
DB8
DB8
DAC
D8
TO V
3k
1273/75/76 • TA07
DGND
W
C
OL
DGND
L
OL
(t
3
(t
)
6
)
Pin 8
COMPARATOR
LOW
DB7
SAMPLE
D7
INTERNAL
–
+
CLOCK
12
V
tantalum in parallel with 0.1 F ceramic).
APPROXIMATION
Pin 9
LOW
DB6
DD
SUCCESSIVE
D6
REGISTER
DBN
(Pin 24): Positive Supply, 5V. Bypass to AGND (10 F
CONTROL
LOGIC
Pin 10
LOW
DB5
D5
V
A) V
DD
Load Circuits for Output Float Delay
3k
12
OH
DGND
TO HIGH-Z
V
Pin 11
LOW
SS
DB4
D4
(NC ON LTC1273)
LATCHES
OUTPUT
LTC1275/LTC1276
10pF
Pin 13
D3/11
DB11
DB3
LTC1273/75/76 • FBD
•
•
•
D11
D0/8
BUSY
CS
RD
HBEN
Pin 14
D2/10
DB10
DB2
DBN
B) V
Pin 15
LTC1273
D1/9
DB1
DB9
OL
TO HIGH-Z
5V
1273/75/76 • TA08
3k
DGND
10pF
Pin 16
D0/8
DB0
DB8
9