Si3050 datasheet(44/128 Pages) SILABS

44 / 128 page

Si3050 + Si3011/18/19

Rev. 1.5

5.33. Companding in PCM Mode

The Si3050 supports both µ-Law and A-Law companding formats in addition to 16-bit linear data. The 8-bit

companding schemes follow a segmented curve formatted as a sign bit, three chord bits, and four step bits. µ-Law

is commonly used in North America and Japan, while A-Law is primarily used in Europe. Data format is selected

via the PCMF bits (Register 33). Table 22 on page 45 and Table 23 on page 46 define the µ-Law and A-Law

encoding formats. If linear mode is used the resulting 16-bit data is transmitted in two consecutive 8-bit PCM

highway timeslots as shown in Figure 34.

5.34. 16 kHz Sampling Operation in PCM Mode

The Si3050 can be configured to support a 16 kHz sampling rate and transmit the data on an 8 kHz PCM or GCI

highway bus. By setting the HSSM bit (Register 7, bit 3) to 1, the DAA changes its sampling rate, Fs, to 16 kHz if it

was originally configured for an 8 kHz sampling rate. If µ-law or A-law companding is used, the resulting 8-bit

samples are transmitted in two consecutive 8-bit PCM highway timeslots. If linear mode is used, the resulting 16-bit

samples are transmitted in four consecutive 8-bit PCM highway timeslots as shown in Figure 35.

Figure 34. PCM Highway Transmission, Single Clock Cycle, 16-bit linear mode

(TXS = RXS = 0, PHCF = 0, TRI = 1, PCMF = 11)

Figure 35. PCM Highway Transmission, Single Clock Cycle, 16-bit linear mode

(TXS = RXS = 0, PHCF = 0, TRI = 1, PCMF = 11, HSSM = 1)

818

MSB

LSB

MSB

LSB

HI-Z

PCLK

FSYNC

PCLK_CNT

DRX

DTX

MSB

HI-Z

LSB

HI-Z

Sample 1

Sample 2

216

818

19 20

36 37

PCLK

FSYNC

PCLK_CNT

DRX

DTX

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