ADS5295IPFP datasheet(71/91 Pages) TI

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Channel 8 Data

MAP_CH5678_to_OUTn[3:0] = 0000

Channel 7 Data

MAP_CH5678_to_OUTn[3:0] = 0010

Channel 6 Data

MAP_CH5678_to_OUTn[3:0] = 0100

Channel 5 Data

MAP_CH5678_to_OUTn[3:0] = 0110

Channel 4 Data

MAP_CH1234_to_OUTn[3:0] = 0110

Channel 3 Data

MAP_CH1234_to_OUTn[3:0] = 0100

Channel 2 Data

MAP_CH1234_to_OUTn[3:0] = 0010

Channel 1 Data

MAP_CH1234_to_OUTn[3:0] = 0000

MAP_CH5678_to_OUTn[3:0] = 1xxx,

the unused OUT LVDS buffer is powered down.

MAP_CH1234_to_OUTn[3:0] = 1xxx,

the unused OUT LVDS buffer is powered down.

OUTn

(1)

OUTn

(1)

ADS5295

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SBAS595 – DECEMBER 2012

Similarly, input channels 5 to 8 can be mapped to any LVDS output (OUT5A, OUT5B to OUT8A, OUT8B) using

the MAP_CH5678_TO_OUTnA, MAP_CH5678_TO_OUTnB bits, as shown in Table 17. Both multiplexing

options are controlled by registers 50h to 55h. Channel mapping block diagrams for one-wire mode and two-wire

mode are illustrated in Figure 64 and Figure 65, respectively.

Table 17. Multiplexing IN5 to IN8

MAP_CH5678_TO_OUTN[3:0](1)

MAPPING

USED IN ONE-WIRE MODE?

USED IN TWO-WIRE MODE?

0000

ADC input channel IN8 to OUTn

Y (LSB byte)

ADC input channel IN8 to OUTn

0001

Y (MSB byte)

(two-wire only)

0010

ADC input channel IN7 to OUTn

Y (LSB byte)

ADC input channel IN7 to OUTn

0011

Y (MSB byte)

(two-wire only)

0100

ADC input channel IN6 to OUTn

Y (LSB byte)

ADC input channel IN6 to OUTn

0101

Y (MSB byte)

(two-wire only)

0110

ADC input channel IN5 to OUTn

Y (LSB byte)

ADC input channel IN5 to OUTn

0111

Y (MSB byte)

(two-wire only)

LVDS output buffer OUTn

1xxx

—

powered down

(1)

n = 5A, 5B, 6A, 6B, 7A, 7B, 8A, or 8B.

(1) For channels 1 to 4, n = 1A, 1B, 2A, 2B, 3A, 3B, 4A, and 4B. For channels 5 to 8, n = 5A, 5B, 6A, 6B, 7A, 7B, 8A, and 8B.

Figure 64. One-Wire Channel Mapping Mode

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