LTC2498 Linear Technology, LTC2498 Datasheet - Page 25

• Manufacturer Part Number: LTC2498
• Description: 24-Bit 8-/16-Channel ADC
• Manufacturer: Linear Technology

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