AD4084BBCZ datasheet(48/94 Pages) AD

48 / 94 page

Data Sheet

AD4084

DIGITAL INTERFACE

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Rev. 0 | 48 of 94

Figure 80. Single Lane LVDS, Echo Clock Mode, LVDS_CNV_CLK_CNT Position Example

Figure 81. Dual Lane LVDS, Echo Clock Mode, LVDS_CNV_CLK_CNT Position Example

Table 20. Valid LVDS_CNV_CLK_CNT Settings

LVDS_CNV_CLK_CNT

Settings

Clock Count Number

Single Lane Mode

Dual Lane Mode

0b0000

0b0001

0b0010

0b0011

0b0100

Selection not valid

0b0101

Selection not valid

0b0110

Selection not valid

0b0111

Selection not valid

As a overview guide,

Table 20 indicates the minimum required LVDS_CNV_CLK_CNT

settings for various conversion rates.

The maximum tMSB of 22.4ns, that is with the gain error correction

enabled (see the Gain Error Correction section), is used for all

calculations in

Table 20.

On power-up, the value of the gain error correction is 0x200,

disabling the correction and allowing for a lower latency result. In

this case, tMSB is 18 ns and a latency of 78.13 ns can be achieved.

To aid alignment of this valid result data position with the digital host

of the user, the ADC Data Interface Configuration A register (see

the ADC Data Interface Configuration A Register section, Address

0x15) contains access to the interface check feature enabled by

setting the INTF_CHK_EN bit. When this bit is set, the ADC results

are no longer output on the interface, and the output is replaced

with a fixed pattern 20b1010 1100 0101 1101 0110 (0xA C5D6).

This feature allows the user to align and test the data interface to

their digital host. When the INTF_CHK_EN bit is unset, the normal

conversion results are output to the LVDS interface immediately.

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