Data Sheet

ADA4350

Rev. B | Page 29 of 37

Table 14. 24-Bit Map Used in Serial Mode Operation

Bit No.

Function

Default Setting

0

S0 on/off control. Write 1 to this bit to close Switch S0.

0

1

S1 on/off control. Write 1 to this bit to close Switch S1.

0

2

S2 on/off control. Write 1 to this bit to close Switch S2.

0

3

S3 on/off control. Write 1 to this bit to close Switch S3.

0

4

S4 on/off control. Write 1 to this bit to close Switch S4.

0

5

S5 on/off control. Write 1 to this bit to close Switch S5.

0

6

S6 on/off control. Write 1 to this bit to close Switch S6.

0

7

S7 on/off control. Write 1 to this bit to close Switch S7.

0

8

S8 on/off control. Write 1 to this bit to close Switch S8.

0

9

S9 on/off control. Write 1 to this bit to close Switch S9.

0

10

S10 on/off control. Write 1 to this bit to close Switch S10.

0

11

S11 on/off control. Write 1 to this bit to close Switch S11.

0

12

Reserved. Set to logic low.

0

131

Optional internal 1 pF feedback capacitor between the inverting input and the output of the amplifier.

Write 1 to this bit to turn the capacitor on.

0

14

Disable the SDO pin. Write 1 to this bit to disable the SDO pin.

0

15

Disable the M1 amplifier. Write 1 to this bit to disable the M1 amplifier.

0

16

Reserved. Set to logic low.

0

17

Reserved. Set to logic low.

0

18

Reserved. Set to logic low.

0

19

Reserved. Set to logic low.

0

20

Reserved. Set to logic low.

0

21

Reserved. Set to logic low.

0

22

Reserved. Set to logic low.

0

23

Read/write bit. Set to 1 to read and set to 0 to write.

0

1

The optional internal 1 pF feedback capacitor provides a quick and convenient way to compensate the TIA when using a high value feedback resistor (>1 MΩ).

Table 15. Serial Mode Operation

Command (Hex Code Format, B23…B0)

Switch Closed

Gain Path Selected

00 00 41(MSB Side)

S0 and S6

FB0

00 20 41

S0 and S6

FB0, optional internal feedback capacitor on

00 00 82

S1 and S7

FB1

00 01 04

S2 and S8

FB2

00 02 08

S3 and S9

FB3

00 04 10

S4 and S10

FB4

00 08 20

S5 and S11

FB5