Datasheet

LTC2440
16
2440fd
APPLICATIONS INFORMATION
Figure 6. External Serial Clock, Reduced Data Output Length
Figure 7. External Serial Clock, CS = 0 Operation (2-Wire)
SDO
15
BUSY
SCK
(EXTERNAL)
CS
DATA OUTPUT
CONVERSIONSLEEP SLEEP
TEST EOC TEST EOC
DATA OUTPUT
Hi-Z Hi-ZHi-Z
CONVERSION
2410 F06
MSBSIG
BIT 8BIT 27 BIT 9BIT 28BIT 29BIT 30
EOC
BIT 31BIT 0
EOC
Hi-Z
TEST EOC
= EXTERNAL OSCILLATOR
= INTERNAL OSCILLATOR
V
CC
f
O
REF
+
REF
–
SCK
IN
+
IN
–
SDO
GND
CS
EXT
2
14
BUSY
15
3
4
13
5
6
12
1, 8, 9, 16
11
10
SDI
7
REFERENCE VOLTAGE
0.1V TO V
CC
ANALOG INPUT RANGE
–0.5V
REF
TO 0.5V
REF
1μF
4.5V TO 5.5V
LTC2440
3-WIRE
SPI INTERFACE
200nV NOISE, 50/60Hz REJECTION
10-SPEED/RESOLUTION PROGRAMMABLE
2μV NOISE, 880Hz OUTPUT RATE
V
CC
EOC
BIT 31
SDO
BUSY
SCK
(EXTERNAL)
CS
MSBSIG
BIT 0
LSB
24
BIT 5BIT 27 BIT 26BIT 28BIT 29BIT 30
SLEEP DATA OUTPUT CONVERSION
2440 F07
CONVERSION
= EXTERNAL OSCILLATOR
= INTERNAL OSCILLATOR
V
CC
f
O
REF
+
REF
–
SCK
IN
+
IN
–
SDO
GND
CS
EXT
2
14
BUSY
15
3
4
13
5
6
12
1, 8, 9, 16
11
10
SDI
7
REFERENCE VOLTAGE
0.1V TO V
CC
ANALOG INPUT RANGE
–0.5V
REF
TO 0.5V
REF
1μF
4.5V TO 5.5V
LTC2440
3-WIRE
SPI INTERFACE
200nV NOISE, 50/60Hz REJECTION
10-SPEED/RESOLUTION PROGRAMMABLE
2μV NOISE, 880Hz OUTPUT RATE
V
CC