ADC3683 datasheet(38/73 Pages) TI

부품명	ADC3683

상세설명	ADC368x 18-bit 0.5 to 65-MSPS Low Noise Ultra-low Power Dual Channel ADC

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8.3.5.2 Output Interface/Mode Configuration

The following sequence summarizes all the relevant registers for changing the output interface and/or enabling

the decimation filter. Steps 1 and 2 must come first since the E-Fuse load reset the SPI writes, the remaining

steps can come in any order.

Table 8-7. Configuration steps for changing interface or decimation

STEP

FEATURE

ADDRESS

DESCRIPTION

1

Output

Interface

0x07

Select the output interface bit mapping depending on resolution and output interface.

Output Resolution

2-wire

1-wire

1/2-wire

14-bit

0x2B

0x6C

0x8D

16-bit

0x4B

18-bit

0x2B

20-bit

0x4B

2

0x13

Load the output interface bit mapping using the E-fuse loader (0x13, D0). Program register 0x13 to

0x01, wait ~ 1ms so that bit mapping is loaded properly followed by 0x13 0x00

3

0x19

Configure the FCLK frequency based on bypass/decimation and number of lanes used.

Bypass/Dec

SLVDS

FCLK SRC

(D7)

FCLK DIV

(D4)

TOG FCLK

(D0)

Bypass/ Real

Decimation

2-wire

0

1

0

1-wire

0

1/2-wire

0

Complex

Decimation

2-wire

1

0

1-wire

1

0

1/2-wire

0

1

4

0x1B

Select the output interface resolution using the bit mapper (D5-D3).

5

0x20

0x21

0x22

Select the FCLK pattern for decimation for proper duty cycle output of the frame clock.

Output Resolution

2-wire

1-wire

1/2-wire

Real Decimation

14-bit

use default

0xFE000

use default

16-bit

0xFF000

18-bit

0xFF800

20-bit

0xFFC00

Complex

Decimation

14-bit

0xFFFFF

16-bit

18-bit

20-bit

6

Decimation

Filter

0x24

Enable the decimation filter

7

0x25

Configure the decimation filter

8

0x2A/B/C/D

0x31/2/3/4

Program the NCO frequency for complex decimation (can be skipped for real decimation)

9

0x27

0x2E

Configure the complex output data stream (set both bits to 0 for real decimation)

SLVDS

OP-Order (D4)

Q-Delay (D3)

2-wire

1

0

1-wire

0

1

1/2-wire

1

10

0x26

Set the mixer gain and toggle the mixer reset bit to update the NCO frequency.

ADC3683

SBAS872 – DECEMBER 2020

www.ti.com

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유사한 부품 번호 - ADC3683

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Texas Instruments	ADC3682	4Mb / 75P	[Old version datasheet] ADC368x 18-bit 0.5 to 65-MSPS Low Noise Ultra-low Power Dual Channel ADC DECEMBER 2021
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