AFE032 datasheet(30/77 Pages) TI1

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0.2

0.4

0.6

0.8

1.2

100

200

300

400

500

600

Frequency (kHz)

Block 2

Block 1

C010

FCC Filter

FS = 1200 kHz

0.2

0.4

0.6

0.8

1.2

100

200

300

400

500

600

Frequency (kHz)

Block 2

Block 1

C011

ARIB Filter

FS = 1200 kHz

0.2

0.4

0.6

0.8

1.2

120

150

180

210

Frequency (kHz)

C012

CELENEC A Filter

FS = 400 kHz

Block 2

AFE032

SBOS669A – AUGUST 2013 – REVISED DECEMBER 2013

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Figure 23 shows the transfer function of block 2 when the recommended coefficients for the CENELEC A band

are used.

Figure 23. Transfer Function of Block 2 - CENELEC A Band Coefficients According to Table 8

Figure 24 shows the transfer function of blocks 1 and 2 when the recommended coefficients for the ARIB band

are used.

Figure 24. Transfer Function of Blocks 1 and 2 - ARIB Band Coefficients According to Table 7 and

Table 8

Figure 25 shows the transfer function of blocks 1 and 2 when the recommended coefficients for the FCC band

are used.

Figure 25. Transfer Function of Blocks 1 and 2 - FCC Band Coefficients According to Table 7 and Table 8

SPI Clock To DAC Clock Synchronization

The device receives DAC samples from the external DSP over the SPI (which operates using SCLK) and writes

these samples to the ASYNCH FIFO for internal synchronization (the ASYNCH FIFO and the rest of the DSP

path operate using the internally-generated DAC_CLK signal). The FIFO read controller pulls the samples out of

the ASYNCH FIFO at the rate determined by the DAC_CLK frequency (not the rate determined by fS).

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