29

LTC2400

SDO

SCK

CS

CS

SDO

SCK

3

2

1

4

5

6

7

8

0.1

µF

0.1

µF

5V

5V

GND

LTC2400

2400 F31

D

DATA 2

DATA 1

CS

CLK

GND

CH0

CH1

CH2

CH3

CH4

CH5

CH6

CH7

S0

S1

S2

S3

S4

S5

S6

S7

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

LTC1391

Figure 31. Multiplex 8-Signal Sources with the LTC1391 and Maintain the LTC2400’s Conversion Accuracy

SDO

SCK

CS

CHIP SELECT

SERIAL

SERIAL

3

3

7

4

6

R1

9.09k

5.1k

R2

90.9k

*OPTIONAL: LIMITS INPUT CURRENT IF THE

INPUT VOLTAGE GOES BELOW – 300mV

2

2

1

4

5

6

7

8

0.1

µF

5V

GND

LTC2400

0.1

µF

5V

5V

–5V

0.1

µF

0.1

µF

11

4

7

8

12

1

µF

EXT

1

µF

DIFFERENTIAL

INPUT

BRIDGE-

TYPICAL

INPUT

C1

0.01

µF

0.1

µF

2400 F30

–5V

1/2

LTC1043

13

16

14

17

350

Ω

AGND OR

350

Ω

350

Ω

350

Ω

–

+

LTC1050

Figure 30. Differential to Single-Ended Converter for Low Level Inputs, Such as Bridges, Maintains the LTC2400’s High Accuracy