AFE5804 datasheet(44/60 Pages) TI

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EN_SDR= '1',FALL_SDR='0'

FCLKP

LCLKP

OUTP

EN_SDR= '1',FALL_SDR='1'

FCLKP

LCLKP

OUTP

DATA OUTPUT FORMAT MODES

AFE5804

SBOS442A – JUNE 2008 – REVISED SEPTEMBER 2008 ................................................................................................................................................ www.ti.com

In addition to programming the phase of LCLK in the DDR mode, the device can also be made to operate in SDR

mode by setting the EN_SDR bit to '1'. In this mode, the bit clock (LCLK) is output at 12 times the input clock, or

twice the rate as in DDR mode. Depending on the state of FALL_SDR, LCLK may be output in either of the two

manners shown in Figure 94. As Figure 94 illustrates, only the LCLK rising (or falling) edge is used to capture the

output data in SDR mode.

Figure 94. SDR Interface Modes

The SDR mode does not work well beyond 40MSPS because the LCLK frequency becomes very high.

The ADC output, by default, is in straight offset binary mode. Programming the BTC_MODE bit to '1' inverts the

MSB, and the output becomes binary two's complement mode.

Also by default, the first bit of the frame (following the rising edge of FCLKP) is the LSB of the ADC output.

Programming the MSB_FIRST mode inverts the bit order in the word, and the MSB is output as the first bit

following the FCLKP rising edge.

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