Data Sheet

ADRF6516

Rev. C | Page 15 of 29

REGISTER MAP AND CODES

The filter frequency, preamplifier gain, postamplifier gain, and VGA maximum gain can be programmed using the SPI interface. Table 4

provides the bit map for the internal 8-bit register of the ADRF6516. The preamplifier, postamplifier, and VGA maximum gain code bits

(Bits[B3:B1]) are referred to elsewhere in this data sheet as Digital Gain Code 000 through Digital Gain Code 111.

Table 4. Register Map

MSB

LSB

B8

B7

B6

B5

B4

B3

B2

B1

Filter frequency code

Preamplifier gain

code

Postamplifier gain

code

VGA max gain

code

See Table 5

0 = 3 dB

1 = 6 dB

0 = 6 dB

1 = 12 dB

0 = 22 dB

1 = 28 dB

Table 5. Frequency Code vs. Corner Frequency Lookup Table

Corner Frequency (MHz)

00000

No signal

00001

1

00010

2

00011

3

00100

4

00101

5

00110

6

00111

7

01000

8

01001

9

01010

10

01011

11

01100

12

01101

13

01110

14

01111

15

Corner Frequency (MHz)

10000

16

10001

17

10010

18

10011

19

10100

20

10101

21

10110

22

10111

23

11000

24

11001

25

11010

26

11011

27

11100

28

11101

29

11110

30

11111

31

1

MSB first.