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STA400A bảng dữ liệu(PDF) 11 Page - STMicroelectronics |
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11 / 117 page 11/117 STA400A two embedded ADCs. This functionality gives the possibility to use two external ADCs connected to the satellite digital input (IF2SD[7:0]) and to the terrestrial digital input (IF2TD[9:0]) respectively. The digital inputs must be tied to ground when not used. The FTESTOUT[15:0] pins are available for testing purpose and for measuring system performance. 1.1 IF SAMPLING AND CONTROL INTERFACE This block comprises the embedded ADCs, the satellite and terrestrial AGCs and CDEC CONTROL registers. It receives from the RF Front-End the two QPSK modulated satellite signals centered at 6.095 MHz and the Mul- tiCarrier Modulated terrestrial signal centered at 2.99 MHz (2nd IF frequencies). These signals are over sampled by the 23.92 MHz master clock (MCLK) and converted to digital on 8 bits for the satellite composite signal and on 10 bits for the terrestrial signal (see fig.1). The programmable registers of the IF Sampling block are described in section 2.6. Embedded ADCs The two embedded ADCs are 10 bit high speed A/D converters designed for high sampling rate (up to 50 MHz) and low power consumption (1mW/MHz) with a full differential pipeline conversion architecture that needs 6 clock periods for one conversion. A voltage reference is integrated in the circuit for external components minimization but it is possible to use an external reference. The ADCs provide also a reduced input capacitance, a low reference capability and a wide input bandwidth (50MHz). Pins IF2xA_P IF2xA_N can be connected as full-differential inputs or as pseudo-differential input. In fig.4 the latter configuration is showed (x=S for Satellite and x=T for Terrestrial branch). Figure 4. ADC Pseudo-Differental Configuration The two pins xREFM (Bottom of the reference ladder) and xREFP (Top of the reference ladder) are decoupling nodes for conversion dynamic adjustment; when the internal reference is used these pins must be connected as showed in figure 4. Pin xADCREF is connected with an external resistor (typical value 47 Kohm) to trim the internal bias current, xINCM is the output common mode used to centre the external input network and xVCMO is the internal common mode that can be externally filtered by a capacitor. 27pF 47pF 33ohm 50ohm VIN 100nF 2.2uF 47K 33ohm 50ohm xVCMO xREFP DATA[9:0] xREFM IF2xA_N IF2xA_P xINCM xADCREF 100pF 100nF 100nF 100pF FROM INTERNAL CLK DISTRIBUTION |
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