ADS5295IPFP datasheet(70/93 Pages) TI2

70 / 93 page

ADS5295

SBAS595 – DECEMBER 2012

www.ti.com

PROGRAMMABLE MAPPING BETWEEN INPUT CHANNELS AND OUTPUT PINS

The ADS5295 has 16 pairs of LVDS channel outputs. The mapping of ADC channels to LVDS output channels is

programmable to allow for flexibility in board layout. The control register mapping is shown in Table 15. The 16

LVDS channel outputs are split into two groups of eight LVDS pairs. Within each group, four ADC input channels

can be multiplexed to the eight LVDS pairs, depending on the mode of operation (one-wire mode or two-wire

mode).

Table 15. Mapping Control Registers

ADDRESS

D15

D14

D13

D12

D11

D10

NAME

(Hex)

MAP_CH1234_TO_OUT1A

MAP_CH1234_TO_OUT1B

MAP_CH1234_TO_OUT2A

MAP_CH1234_TO_OUT2B

MAP_CH1234_TO_OUT3A

MAP_CH1234_TO_OUT3B

MAP_CH1234_TO_OUT4A

MAP_CH1234_TO_OUT4B

MAP_CH5678_TO_OUT5B

MAP_CH5678_TO_OUT5A

MAP_CH5678_TO_OUT6B

MAP_CH5678_TO_OUT6A

MAP_CH5678_TO_OUT7B

MAP_CH5678_TO_OUT7A

MAP_CH5678_TO_OUT8B

MAP_CH5678_TO_OUT8A

Input channels 1 to 4 can be mapped to any LVDS output (OUT1A, OUT1B to OUT4A, OUT4B) using the

MAP_CH1234_TO_OUTnA, MAP_CH1234_TO_OUTnB bits, as shown in Table 16.

Table 16. Multiplexing IN1 to IN4

MAP_CH1234_TO_OUTN[3:0](1)

MAPPING

USED IN ONE-WIRE MODE?

USED IN TWO-WIRE MODE?

0000

ADC input channel IN1 to OUTn

Y (LSB byte)

ADC input channel IN1 to OUTn

0001

Y (MSB byte)

(two-wire only)

0010

ADC input channel IN2 to OUTn

Y (LSB byte)

ADC input channel IN2 to OUTn

0011

Y (MSB byte)

(two-wire only)

0100

ADC input channel IN3 to OUTn

Y (LSB byte)

ADC input channel IN3 to OUTn

0101

Y (MSB byte)

(two-wire only)

0110

ADC input channel IN4 to OUTn

Y (LSB byte)

ADC input channel IN4 to OUTn

0111

Y (MSB byte)

(two-wire only)

LVDS output buffer OUTn

1xxx

—

powered down

(1)

n = 1A, 1B, 2A, 2B, 3A, 3B, 4A, or 4B.

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