Data Sheet ADIS16375
Rev. E | Page 19 of 28
Filter Memory Organization
Each filter bank uses two pages of the user register structure.
See Table 53, Table 54, Table 55, and Table 56 for the register
addresses in each filter bank.
Table 53. Filter Bank A Memory Map
Page PAGE_ID Address Register
5 0x05 0x00 PAGE_ID
5 0x05 0x02 to 0x07 Not used
5 0x05 0x08 FIR_COEF_A001
5 0x05 0x0A FIR_COEF_A002
5 0x05 0x0C to 0x7C
FIR_COEF_A003 to
FIR_COEF_A059
5 0x05 0x7E FIR_COEF_A060
6 0x06 0x00 PAGE_ID
6 0x06 0x02 to 0x07 Not used
6 0x06 0x08 FIR_COEF_A061
6 0x06 0x0A FIR_COEF_A062
6 0x06 0x0C to 0x7C
FIR_COEF_A063 to
FIR_COEF_A119
6 0x06 0x7E FIR_COEF_A120
Table 54. Filter Bank B Memory Map
Page PAGE_ID Address Register
7 0x07 0x00 PAGE_ID
7 0x07 0x02 to 0x07 Not used
7 0x07 0x08 FIR_COEF_B001
7 0x07 0x0A FIR_COEF_B002
7 0x07 0x0C to 0x7C
FIR_COEF_B003 to
FIR_COEF_B059
7 0x07 0x7E FIR_COEF_B060
8 0x08 0x00 PAGE_ID
8 0x08 0x02 to 0x07 Not used
8 0x08 0x08 FIR_COEF_B061
8 0x08 0x0A FIR_COEF_B062
8 0x08 0x0C to 0x7C
FIR_COEF_B063 to
FIR_COEF_B119
8 0x08 0x7E FIR_COEF_B120
Table 55. Filter Bank C Memory Map
Page PAGE_ID Address Register
9 0x09 0x00 PAGE_ID
9 0x09 0x02 to 0x07 Not used
9 0x09 0x08 FIR_COEF_C001
9 0x09 0x0A FIR_COEF_C002
9 0x09 0x0C to 0x7C
FIR_COEF_C003 to
FIR_COEF_C059
9 0x09 0x7E FIR_COEF_C060
10 0x0A 0x00 PAGE_ID
10 0x0A 0x02 to 0x07 Not used
10 0x0A 0x08 FIR_COEF_C061
10 0x0A 0x0A FIR_COEF_C062
10 0x0A 0x0C to 0x7C
FIR_COEF_C063 to
FIR_COEF_C119
10 0x0A 0x7E FIR_COEF_C120
Table 56. Filter Bank D Memory Map
Page PAGE_ID Address Register
11 0x0B 0x00 PAGE_ID
11 0x0B 0x02 to 0x07 Not used
11 0x0B 0x08 FIR_COEF_D001
11 0x0B 0x0A FIR_COEF_D002
11 0x0B 0x0C to 0x7C
FIR_COEF_D003 to
FIR_COEF_D059
11 0x0B 0x7E FIR_COEF_D060
12 0x0C 0x00 PAGE_ID
12 0x0C 0x02 to 0x07 Not used
12 0x0C 0x08 FIR_COEF_D061
12 0x0C 0x0A FIR_COEF_D062
12 0x0C 0x0C to 0x7C
FIR_COEF_D063 to
FIR_COEF_D119
12 0x0C 0x7E FIR_COEF_D120
Default Filter Performance
The FIR filter banks have factory-programmed filter designs. They
are all low-pass filters that have unity dc gain. Table 57 provides
a summary of each filter design, and Figure 19 shows the frequency
response characteristics. For more detailed analysis, read each
coefficient into an array and analyze externally.
Table 57. FIR Filter Descriptions, Default Configuration
FIR Filter Bank Taps −3 dB Frequency (Hz)
A 120 310
B 120 55
C 32 275
D 32 63
NO FIR
FILTERING
0
–10
–20
MAG NI TUDE ( dB)
–30
–40
–50
–60
–70
–80
–90
–100
0 200 400 600 800 1000 1200
FREQUENCY (Hz)
09389-027
AD CB
Figure 19. FIR Filter Frequency Response Curves
