ADS5295IPFP datasheet(75/93 Pages) TI2

75 / 93 page

ADS5295

www.ti.com

SBAS595 – DECEMBER 2012

DIGITAL OUTPUT INTERFACE

SERIAL LVDS INTERFACE

The ADS5295 offers several flexible output options, making the device easy to interface to an application-specific

integrated circuit (ASIC) or a field-programmable gate array (FPGA). Each option can be easily programmed

using the serial interface. A summary of all available options is listed in Table 20 along with the default values

after power-up and reset. Following Table 20, each option is described in detail. Table 21 lists the two-wire

Table 20. Summary of Output Interface Options

AVAILABLE IN:

DEFAULT AFTER

ONE-

TWO-

POWER-UP AND

FEATURE

OPTIONS

WIRE

RESET

BRIEF DESCRIPTION

One-wire: ADC data are sent serially over one pair

of LVDS pins.

Wire interface

One- and two-wire

One-wire

Two-wire: ADC data are split and sent serially over

two pairs of LVDS pins.

12x

10x

12x

To be used with digital processing functions, such

Serialization factor

14x

as averaging and decimation filers.

To be used with digital processing functions, such

16x

as averaging and decimation filers.

Only available with one-wire interface for 12x, 10x,

6x, 5x, 7x, 8x

14x, and 16x serialization factors, respectively.

DDR bit clock frequency

Only available with two-wire interface for 12x, 10x,

3x, 2.5x, 3.5x, 4x

14x, and 16x serialization factors, respectively.

1x sample rate

Frame clock frequency

1/2x sample rate

Only available with the two-wire interface.

Byte-wise

Byte-wise: the ADC data are split into upper and

lower bytes that are output on separate wires.

Only available with the two-wire interface.

Bit sequence

Bit-wise

Byte-wise

Bit-wise: the ADC data are split into even and odd

bits that are output on separate wires.

Only available with the two-wire interface.

Word-wise

Byte-wise

Word-wise: successive ADC data samples are sent

over separate wires.

Table 21. Register Settings for Two-wire LVDS Interface

D[7:0]

D15 (EN_WORD_BIT_WISE)

D8 (EN_BIT_WISE)

LVDS OUTPUT

(EN_WORDWISE_BY_CH)

Byte-wise mode

Word-wise mode

Bit-wise mode

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