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ST75951 Datasheet(PDF) 6 Page - STMicroelectronics |
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ST75951 Datasheet(HTML) 6 Page - STMicroelectronics |
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6 / 21 page  MUX 26 27 34 40 43 5 6 35 38 39 9 10 11 15 23 22 21 DV DD DGND AV DD AGND1 AGND2 V CM V REFN V REFP RESET PWRDWN HC0 HC1 REFERENCE VOLTAGE GAIN Bit DR MUX DAA CONTROL + GPIO 28 29 32 33 42 4 14 7 8 V CMS V CMP TSTA1 TSTA2 M/S MCM XTALIN (MCLK) XTALOUT HM 20 19 18 17 GPIO0 GPIO1 GPIO2 GPIO3 44 2 3 45 46 47 16 TSTD1 FS SCLK DOUT DIN TS GPI STLC75951 RING D1 D2 30 31 41 AUXIN D3 D4 DETECTOR F0 LOW PASS FILTER ANALOG MODULATOR LOW-PASS (0.425 x Sampling Frequency) F0 GAIN GAIN ATTE ATTE 2dB 0dB 6dB INFINITE DAC 1 BIT First Order Differential Switched Capacitor Filter 2nd ORDER MODULATOR LOW-PASS (0.425 x Sampling Frequency) CLOCK GENERATOR D5 D6 HIGH PASS FILTER BLOCK DIAGRAM FUNCTIONAL DESCRIPTION ST75951 is a modem AFE front-end integrating the modem side of Krypton K951 and fully compatible to work with ST952. 1 - Transmit Section The functions included in the transmit section are : - D/A converter, - F0 modulator, - Programmable stage +2dB gain, 0dB gain, 6dB attenuation or infinite attenuation, - Transmit Filter including noise shaper and Sinx/x correction. The digital base Band data (DIN) are converted and modulated at F0 and send differentially (D1, D2) to ST952 through capacitive connection. 2 - Receive Section The functions included in the receive section are : - Main and Aux inputs, - Programmable gain 0/6dB, - A/D converter, - F0 demodulator, - Receive filter. The analog differential Main input signal (D3, D4) coming from ST952 is demodulated at F0, goes to the multiplexer and gain receive block then is digi- tally converted and output on DOUT which is the base band data. Thanks to the multiplexer, we can also process base band analog signal on AUXIN. 3 - Clock Generator ST75951 generates all clocks from either a Master clock input on XTALIN (MCLK) or a crystal oscillator connected between XTALIN and XTALOUT. The bypass of the divider M and Q is selected by setting the MCM input pin to ’0’. To be able to provide externally the sampling fre- quency (Slave mode), M/S input pin must be set to ’0’ (see Figure 2). ST75951 6/21 |
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