TLC320AC02IPM datasheet(30/84 Pages) TI

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2–15

2.15.6

Enable Analog Input Summing

By setting bits DS01 and DS00 to 11 in register 5, the normal analog input voltage is summed with the

auxiliary input voltage. The gain for the analog input amplifier is set by data bits DS03 and DS02 in register 4.

2.15.7

DAC Channel (sin x)/x Error Correction

The (sin x)/x compensation filter is designed for zero (sin x)/x error using a B-register value of 15. Since the

filter cannot be removed from the signal path, operation using another B-register value results in an error

in the reconstructed analog output. The error is given by equation 19. Any error compensation needed by

a given application can be performed in the software.

DAC channel frequency response error

+ 20

log

sin

p A B

MCLK

sin

p A

MCLK

(19)

where:

= the frequency of interest

fMCLK = the TLC320AC02 master-clock frequency

= the A-register value

= the B-register value

and the arguments of the sin functions are in radians.

2.16 Serial Communications

2.16.1 Stand-Alone and Master-Mode Word Sequence and Information Content During

Primary and Secondary Communications

For the stand-alone and master modes, the sequence in Figure 2–2 shows the relationship between the

primary and secondary communications interval, the data content into DIN, and the data content from

DOUT.

The TLC320AC02 can provide a phase-shift command or the next secondary communications interval by

decoding 1) the programmed state of the FC1 and FC0 inputs and the D01 and D00 data bits in the primary

data word, or 2) the state of the FC1 and FC0 inputs and the DS15 and DS14 data bits in the secondary

data word (see Table 2 – 3). When DS13 (the R/W bit) is the default value of 0, all 16 bits from DOUT are

0 during secondary communication. However, when the R/W bit is set to 1 in the secondary communication

control word, the secondary transmission from DOUT still contains 0s in the eight MSBs. The lower order

8 bits contain the data of the register currently being addressed. This function provides register status

information for the host.

TLC320AC02IPM Datasheet(PDF) 30 Page - Texas Instruments