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ADC1175-50 Arkusz danych(PDF) 10 Page - National Semiconductor (TI) |
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ADC1175-50 Arkusz danych(HTML) 10 Page - National Semiconductor (TI) |
10 / 19 page Timing Diagram Functional Description The ADC1175-50 maintains superior dynamic performance with input frequencies up to 1/2 the clock frequency, achiev- ing 6.8 effective bits with a 50 MHz sampling rate and 25 MHz input frequency. The analog signal at V IN that is within the voltage range set by V RT and VRB are digitized to eight bits at up to 55 MSPS. Input voltages below V RB will cause the output word to consist of all zeroes. Input voltages above V RT will cause the output word to consist of all ones. While the ADC1175-50 is optimized for top and bottom reference voltages (V RT and V RB) or 2.6V and 0.6V, respectively, and will give best per- formance at these values, V RT has a range of 1.0V to the analog supply voltage, AV DD, while VRB has a range of 0V to 4.0V. V RT should always be at least 1.0V more positive than V RB. With VRT voltages above 2.8V, it is necessary to reduce the clock frequency to maintain SINAD performance. If V RT and VRTS are connected together and VRB and VRBS are connected together, the nominal values of V RT and VRB are 2.6V and 0.6V, respectively. If V RT and VRTS are con- nected together and V RB is grounded, the nominal value of V RT is 2.3V. Data is acquired at the falling edge of the clock and the digital equivalent of that data is available at the digital out- puts 2.5 clock cycles plus t OD later. The ADC1175-50 will convert as long as the clock signal is present at the CLK pin. The Power Down pin (PD), when high, puts the ADC1175-50 into a power down mode where power consumption is typi- cally less than 5 mW. When the part is powered down, the digital output pins are in a high impedance TRI-STATE. It takes about 140 ns for the part to become active upon coming out of the power down mode. DS100896-23 FIGURE 1. ADC1175-50 Timing Diagram DS100896-24 FIGURE 2. t EN,tDIS Test Circuit www.national.com 10 |
Podobny numer części - ADC1175-50 |
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Podobny opis - ADC1175-50 |
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