MCP37D11-80ESLASHTE datasheet(49/136 Pages) MICROCHIP

49 / 136 page

 2020 Microchip Technology Inc.

DS20006381A-page 49

MCP37D11-80: 80 MSPS 12-BIT PIPELINED ADC

Tables 4-13 and 4-14 show the NSR filter selections.

The selectable filters (tuning word) for each mode are:

• 11-bit mode: 0 to 41

• 12-bit mode: 42 to 76

NSR does not affect harmonic distortion. Various FFT

spectrum plots when NSR is applied are shown in

Figure 3-13 to Figure 3-18. As shown in these plots,

high SNR can be achieved by utilizing the NSR

feature. The SNR is calculated within the defined NSR

bandwidth. SNR and SFDR performance versus input

amplitude when NSR is enabled is shown in Figure 3-

21. When the NSR block is disabled, the ADC data is

provided directly to the output.

When the NSR block is disabled, the ADC data is

provided directly to the output.

TABLE 4-12:

Control Parameter

Descriptions

NSR Enable bits

<EN_NSRA_11>

0x7A

Enable 11-bit NSR for channel A

<EN_NSRA_12>

0x7A

Enable 12-bit NSR for channel A

<EN_NSRB_11>

0x7A

Enable 11-bit NSR for channel B

<EN_NSRB_12>

0x7A

Enable 12-bit NSR for channel B

NSR Settings

NSRA<6:0>

0x78

NSR A settings for single-channel or channel A for dual-channel mode

NSRB<6:0>

0x79

NSR B settings for channel B in dual-channel mode

NSR Block Reset Control

<EN_NSR_RESET>

0x78

Resets NSR in the event of overload

Digital Post Processing (DPP) Function Block Settings

EN_DPPDUAL

0x79

Enable DPP block for dual-channel mode

TABLE 4-13:

11-BIT NSR FILTER

SELECTION(1)

NSR Filter No.

(Tuning Word)

fCenter/fS

(% of fS)

NSRA<6:0>

NSRB<6:0>

00.12

000-0000

0.133

000-0001

0.146

000-0010

—

0.367

001-0011

0.38

001-0100

0.125

001-0101

0.1375

001-0110

0.15

001-0111

—

0.3625

010-1000

0.375

010-1001

Note 1:

Filters 0 - 41 are used for 11-bit mode

only. If these are used for 12-bit mode, the

output becomes unknown state.

TABLE 4-14:

12-BIT NSR FILTER

SELECTION(1)

NSR Filter No.

(Tuning Word)

fCenter/fS

(% of fS)

NSRA<6:0>

NSRB<6:0>

0.125

010-1010

0.1375

010-1011

0.15

010-1100

—

0.3625

011-1101

0.375

011-1110

0.15

011-1111

0.1667

100-0000

0.1833

100-0001

—

0.35

100-1011

0.3667

100-1100

Note 1:

Filters 42 - 76 are used for 12-bit mode

only. If these are used for 11-bit mode, the

output becomes unknown state.

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