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MT9196ASR Datasheet(PDF) 6 Page - Zarlink Semiconductor Inc |
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MT9196ASR Datasheet(HTML) 6 Page - Zarlink Semiconductor Inc |
6 / 46 page MT9196 Data Sheet 6 Zarlink Semiconductor Inc. section so that Rx gain adjustment will not affect side-tone levels. The side-tone path may be enabled/disabled with the Voice sidetone bit located in the Receive Path Control Register (address 13h). Transmit and receive filter gains are controlled by the TxFG0-TxFG2 and RxFG0-RxFG2 control bits, respectively. These are located in the FCODEC Control Register 1 (address 0Ah). Transmit filter gain is adjustable from 0 dB to +7 dB and receive filter gain from 0 dB to -7 dB, both in 1 dB increments. Side-tone filter gain is controlled by the STG0-STG2 control bits located in the FCODEC Control Register 2 (address 0Bh). Side-tone gain is adjustable from -9.96 dB to +9.96 dB in 3.32 dB increments. Companding law selection for the Filter/CODEC is provided by the A/ µ companding control bit while the coding scheme is controlled by the sign-mag/CCITT control bit. Both of these reside in Control Register 2 (address 0Fh). Table 1 illustrates these choices. Table 1 The Filter/CODEC autonull circuit ensures that transmit PCM will contain no more than ±1 bit of offset due to internal circuitry. Digital Gain and Tone Generation The Digital gain and Tone generator block is located, functionally, between the serial FDI port and the Filter/CODEC block. Its main function is to provide digital gain control of the transmit and receive audio signals and to generate digital patterns for DTMF and tone ringer signals. Gain Control Gain control is performed on linear code for both the receive and the transmit PCM. Gain control is set via the Digital Gain Control Register at address 19h. Gain, in 3.0 dB increments, is available within a range of +21.0 dB to -24 dB. DTMF Generator The digital DTMF circuit generates a dual sine-wave pattern which may be routed into the receive path as comfort tones or into the transmit path as network signalling. In both cases the digitally generated signal will undergo gain adjustment as programmed into the transmit and receive gain control registers. Gain control is assigned automatically as functions are selected via the transmit and receive path control registers. The composite signal output level in the transmit direction is -4 dBm0 ( µ-Law) and -10 dBm0 (A-law) with programmable gains at zero dB. Pre-twist of 2.0 dB is incorporated into the composite signal resulting in a low tone output level of -8.12 dBm0 and a high group level of -6.12 dBm0 (for µ-Law, 6 dB lower for A-Law). Note that these levels will be influenced by the Anti-Howling circuit when it is enabled (see Anti-Howling section for more details). DTMF side-tone levels are set to -28 dBm0 from the generator circuit. Other receive path gains must be included when calculating the analog output signal levels. Adjustments to these levels may be made by altering the settings of the Gain Control register (address 19h). Code Sign/ Magnitude CCITT (G.711) µ-Law A-Law + Full Scale 1111 1111 1000 0000 1010 1010 + Zero 1000 0000 1111 1111 1101 0101 -Zero (quiet code) 0000 0000 0111 1111 0101 0101 - Full Scale 0111 1111 0000 0000 0010 1010 |
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