ADA8282

Data Sheet

Rev. 0 | Page 14 of 21

APPLICATIONS INFORMATION

INCREASED GAIN USING TWO ADA8282 DEVICES

IN SERIES

For applications that require gains greater than 36 dB, two

ADA8282 devices can be used in series with each other. To

optimize the signal swing for the path, increment the gains

according to Table 11.

Table 11. Gain Settings for Two Devices in Series

Total Gain (dB)

A1 (Input Side

ADA8282) Gain (dB)

A2 (Output Side

ADA8282) Gain (dB)

36

18

18

42

18

24

48

24

24

54

30

24

60

30

30

66

36

30

72

36

36

24

+OUTA

23

–OUTA

22

+OUTB

21

–OUTB

20

+OUTC

19

–OUTC

18

+OUTD

17

–OUTD

1

2

3

4

5

6

7

8

+INA

–INA

+INB

–INB

+INC

–INC

+IND

–IND

ADA8282

EPAD TIED

TO GROUND

0.1µF

0.1µF

0.1µF

0.1µF

0.1µF

0.1µF

0.1µF

0.1µF

0.1µF

0.1µF

0.1µF

0.1µF

+3.3V

+3.3V

+3.3V

GPIO: +3.3V/0V

+3.3V

10kΩ

SPI BUS

24

+OUTA

23

–OUTA

22

+OUTB

21

–OUTB

20

+OUTC

19

–OUTC

18

+OUTD

17

–OUTD

1

2

3

4

5

6

7

8

+INA

–INA

+INB

–INB

+INC

–INC

+IND

–IND

ADA8282

EPAD TIED

TO GROUND

0.1µF

0.1µF

0.1µF

0.1µF

0.1µF

0.1µF

0.1µF

0.1µF

0.1µF

0.1µF

0.1µF

0.1µF

0.1µF

0.1µF

0.1µF

0.1µF

INPUT A

SOURCE

INPUT B

SOURCE

INPUT C

SOURCE

INPUT D

SOURCE

0.1µF

0.1µF

0.1µF

0.1µF

+3.3V

+3.3V

+3.3V

GPIO: +3.3V/0V

+3.3V

10kΩ

SPI BUS

TO ADC

TO ADC

TO ADC

TO ADC

Figure 28. Using Two ADA8282 Devices in Series to Increase Gain