
LTC2498
26
2498ff
applications inForMation
Figure 10. Internal Serial Clock, Reduced Data Output Length with Valid Channel and Configuration Selection
Figure 11. Internal Serial Clock, Continuous Operation
10F
0.1F
2.7V TO 5.5V
Hi-Z
2498 F10
CS
SCK
(INTERNAL)
SDI
SDO
CONVERSION
SLEEP
DATA INPUT/OUTPUT
CONVERSION
VCC
fO
REF+
REF–
CH0
CH7
CH8
CH15
COM
SCK
SDI
SDO
CS
GND
28
35
29
30
8
15
16
23
7
38
37
1,3,4,5,6,31,32,33,39
36
34
REFERENCE
VOLTAGE
0.1V TO VCC
ANALOG
INPUTS
= EXTERNAL OSCILLATOR
= INTERNAL OSCILLATOR
LTC2498
4-WIRE
SPI INTERFACE
EOC
BIT 28 BIT 27 BIT 26 BIT 25 BIT 24 BIT 23 BIT 22 BIT 21 BIT 20 BIT 19
BIT 29
BIT 30
BIT 31
BIT 18 BIT 17
1
2
3
4
5
6
7
8
9
10
11
12
13
16
1
0
EN
SGL
A2
A1
A0
EN2
IM
FA
FB
SPD
ODD
DON'T CARE
MSB
SIG
“0”
OPTIONAL
10k
VCC
<tEOCTEST
10F
0.1F
2.7V TO 5.5V
EOC
CS
SCK
(INTERNAL)
SDI
SDO
2498 F11
CONVERSION
DATA INPUT/OUTPUT
CONVERSION
BIT 28 BIT 27 BIT 26 BIT 25 BIT 24 BIT 23 BIT 22 BIT 21 BIT 20 BIT 19
BIT 29
BIT 30
BIT 31
1
0
EN
SGL
A2
A1
A0
EN2
IM
FA
FB
SPD
ODD
BIT 18 BIT 17
BIT 0
2
3
1
4
5
6
7
8
9
10
11
12
13
14
32
DON'T CARE
MSB
SIG
“0”
VCC
fO
REF+
REF–
CH0
CH7
CH8
CH15
COM
SCK
SDI
SDO
CS
GND
28
35
29
30
8
15
16
23
7
38
37
1,3,4,5,6,31,32,33,39
36
34
REFERENCE
VOLTAGE
0.1V TO VCC
ANALOG
INPUTS
= EXTERNAL OSCILLATOR
= INTERNAL OSCILLATOR
LTC2498
3-WIRE
SPI INTERFACE
OPTIONAL
10k
VCC