ADC3683 datasheet(62/70 Pages) TI1

62 / 70 page

Figure 9-17. Register 0x25

DDC MUX EN

DECIMATION

REAL OUT

MIX PHASE

R/W-0

Table 9-20. Register 0x25 Field Descriptions

Bit

Field

Type

Reset

Description

DDC MUX EN

R/W

Enables the digital mux between ADCs and decimation filters.

This bit is required for DDC mux settings in register 0x24 (D4,

D3) to go into effect.

0: DDC mux disabled

1: DDC mux enabled

6-4

DECIMATION

R/W

000

Complex decimation setting. This applies to both channels.

000: Bypass mode (no decimation)

001: Decimation by 2

010: Decimation by 4

011: Decimation by 8

100: Decimation by 16

101: Decimation by 32

others: not used

REAL OUT

R/W

This bit selects real output decimation. This mode applies to

both channels. In this mode, the decimation filter is a low pass

filter and no complex mixing is performed to reduce power

consumption. For maximum power savings, the NCO should be

set to 0.

0: Complex decimation

1: Real decimation

2-1

R/W

Must write 0

MIX PHASE

R/W

This bit used to invert the NCO phase

0: NCO phase as is.

1: NCO phase inverted.

Figure 9-18. Register 0x26

MIX GAIN A

MIX RES A

FS/4 MIX A

MIX GAIN B

MIX RES B

FS/4 MIX B

R/W-0

Table 9-21. Register 0x26 Field Descriptions

Bit

Field

Type

Reset

Description

7-6

MIX GAIN A

R/W

This bit applies a 0, 3 or 6dB digital gain to the output of digital

mixer to compensate for the mixing loss for channel A.

00: no digital gain added

01: 3dB digital gain added (should be enabled with real

decimation)

10: 6dB digital gain added (should be enabled with complex

decimation)

11: not used

MIX RES A

R/W

Toggling this bit resets the NCO phase of channel A and loads

the new NCO frequency. This bit does not self reset.

FS/4 MIX A

R/W

Enables FS/4 mixing for DDC A (complex decimation only).

0: FS/4 mixing disabled.

1: FS/4 mixing enabled.

3-2

MIX GAIN B

R/W

This bit applies a 0, 3 or 6dB digital gain to the output of digital

mixer to compensate for the mixing loss for channel B.

00: no digital gain added

01: 3dB digital gain added (should be enabled with real

decimation)

10: 6dB digital gain added (should be enabled with complex

decimation)

11: not used

MIX RES B

R/W

Toggling this bit resets the NCO phase of channel B and loads

the new NCO frequency. This bit does not self reset.

ADC3683-SP

SBASAB5 – MARCH 2024

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