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TSA1203 Datasheet(PDF) 16 Page - STMicroelectronics |
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TSA1203 Datasheet(HTML) 16 Page - STMicroelectronics |
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16 / 20 page  TSA1203 16/20 Operating conditions of the evaluation board: Find below the connections to the board for the power supplies and other pins: Care should be taken for the evaluation board considering the fact that the outputs of the con- verter are 2.5V/3.3V (VCCB2) tolerant whereas the 74LCX573 external buffers are operating up to 2.5V. Single and Differential Inputs: The ADC board components are mounted to test the TSA1203 with single analog input; the ADT1-1WT transformer enables the differential drive into the converter; in this configuration, the resistors RSI6, RSI7, RSI8 for I channel (respec- tively RSQ6, RSQ7, RSQ8 for Q one) are con- nected as short circuits whereas RSI5, RSI9 (re- spectively RSQ5, RSQ9) are open circuits. The other way is to test it via JI1 and JI1B differen- tial inputs. So, the resistances RSI5, RSI9 for I channel (respectively RSQ5, RSQ9 for Q one) are connected as short circuits whereas RSI6, RSI7, RSI8 (respectively RSQ6, RSQ7, RSQ8 for Q one) are open circuits. Grounding consideration So as to better reject noise on the board, connect on the bottom overlay AG (AGND), DG(DGND), GB1(GNDBI) together from one part, and GB2(GNDBE) with GB3(GNDB3) from the other part. Mode select So as to evaluate a single channel or the dual ones, you have to connect on the board the relevant position for the SELECT pin (see figure 9) With the strap connected - to the upper connectors, the I channel at the out- put is selected. - horizontally, the Q channel at the output is se- lected. - to the lower connectors, both channels are se- lected, relative to the clock edge. Figure 9 : mode select Consumption adjustment Before any characterization, care should be taken to adjust the Rpol (Raj1) and therefore Ipol value in function of your sampling frequency. board notation connection internal voltage (V) external voltage (V) AV AVCC 2.5 AG AGND 0 RPI REFPI 0.89 <1.4 RMI REFMI <0.4 CMI INCMI 0.46 <1 RPQ REFPQ 0.89 <1.4 RMQ REFMQ <0.4 CMQ INCMQ 0.46 <1 DV DVCC 2.5 DG DGND 0 GB1 GNDBI 0 VB1 VCCBI 2.5 GB2 GNDBE 0 VB2 VCCBE 2.5/3.3 GB3 GNDB3 0 VB3 VCCB3 2.5 SELECT DVCC DGND CLK I channel Q channel I/Q channels SELECT schematic board |
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