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MT91L62AE Datasheet(PDF) 4 Page - Zarlink Semiconductor Inc |
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MT91L62AE Datasheet(HTML) 4 Page - Zarlink Semiconductor Inc |
4 / 19 page MT91L62 Data Sheet 4 Zarlink Semiconductor Inc. Analog Interfaces Standard interfaces are provided by the MT91L62. These are: • The analog inputs (transmitter), pins AIN+/AIN-. The maximum peak to peak input is 2.123 Vpp µ−law across AIN+/AIN- and 2.2 Vpp A-law across these pins. • The analog outputs (receiver), pins AOUT+/AOUT-. This internally compensated fully differential output driver is capable of driving a load of 20 k ohms. PCM Serial Interface A serial link is required to transport data between the MT91L62 and an external digital transmission device. The MT91L62 utilizes the strobed data interface found on many standard Codec devices. This interface is commonly referred to as Simple Serial Interface (SSI). The bit clock rate is selected by setting the CSL2-0 control pins as shown in Figure 2. Quiet Code The PCM serial port can be made to send quiet code to the decoder and receive filter path by setting the RxMute pin high. Likewise, the PCM serial port will send quiet code in the transmit path when the TxMute pin is high. When either of these pins are low their respective paths function normally. The -Zero entry of Table 1 is used for the quiet code definition. SSI Mode The SSI BUS consists of input and output serial data streams named Din and Dout respectively, a Clock input signal (CLOCKin), and a framing strobe input (STB). A 4.096 MHz master clock is also required for SSI operation if the bit clock is less than 512 kHz. The timing requirements for SSI are shown in Figures 5 & 6. In SSI mode the MT91L62 supports only B-Channel operation. Hence, in SSI mode transmit and receive B-Channel data are always in the channel defined by the STB input. The data strobe input STB determines the 8-bit timeslot used by the device for both transmit and receive data. This is an active high signal with an 8 kHz repetition rate. SSI operation is separated into two categories based upon the data rate of the available bit clock. If the bit clock is 512 kHz or greater then it is used directly by the internal MT91L62 functions allowing synchronous operation. If the available bit clock is 128 kHz or 256 kHz, then a 4096 kHz master clock is required to derive clocks for the internal MT91L62 functions. CSL2 CSL1 CSL0 External Clock Bit Rate (kHz) CLOCKin (kHz) 1 0 0 128 4096 1 0 1 256 4096 0 0 0 512 512 0 0 1 1536 1536 0 1 0 2048 2048 0 1 1 4096 4096 Table 2 - Bit Clock Rate Selection |
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