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CS5509-ASZ 数据表(PDF) 11 Page - Cirrus Logic |
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CS5509-ASZ 数据表(HTML) 11 Page - Cirrus Logic |
11 / 23 page CS5509 DS125F2 11 put signals. The converter can be used to convert both unipolar and bipolar signals by changing the BP/UP pin. Recalibration is not required when switching between unipolar and bipolar modes. At the end of the calibration cycle, the on-chip mi- crocontroller checks the logic state of the CONV signal. If the CONV input is low the device will en- ter the standby mode where it waits for further in- struction. If the CONV signal is high at the end of the calibration cycle, the converter will enter the conversion state and perform a conversion on the input channel. The CAL signal can be returned low any time after calibration is initiated. CONV can also be returned low, but it should never be taken low and then taken back high until the calibration period has ended and the converter is in the standby state. If CONV is taken low and then high again with CAL high while the converter is calibrating, the device will interrupt the current calibration cy- cle and start a new one. If CAL is taken low and CONV is taken low and then high during calibra- tion, the calibration cycle will continue as the con- version command is disregarded. The state of BP/UP is not important during calibrations. If an "end of calibration" signal is desired, pulse the CAL signal high while leaving the CONV signal high continuously. Once the calibration is complet- ed, a conversion will be performed. At the end of the conversion, DRDY will fall to indicate the first valid conversion after the calibration has been completed. Conversion The conversion state can be entered at the end of the calibration cycle, or whenever the converter is idle in the standby mode. If CONV is taken high to initiate a calibration cycle ( CAL also high), and re- mains high until the calibration cycle is completed (CAL is taken low after CONV transitions high), the converter will begin a conversion upon comple- tion of the calibration period. The BP/UP pin is not a latched input. The BP/UP pin controls how the output word from the digital filter is processed. In bipolar mode the output word computed by the digital filter is offset by 8000H (see Understanding Converter Calibration). BP/UP can be changed after a conversion is started as long as it is stable for 82 clock cycles of the conversion period prior to DRDY falling. If one wishes to in- termix measurement of bipolar and unipolar signals on various input signals, it is best to switch the BP/UP pin immediately after DRDY falls and leave BP/UP stable until DRDY falls again. The digital filter in the CS5509 has a Finite Im- pulse Response and is designed to settle to full ac- curacy in one conversion time. If CONV is left high, the CS5509 will perform con- tinuous conversions. The conversion time will be 1622 clock cycles. If conversion is initiated from the standby state, there may be up to two XIN clock cycles of uncertainty as to when conversion actual- ly begins. This is because the internal logic oper- ates at one half the external clock rate and the exact phase of the internal clock may be 180° out of phase relative to the XIN clock. When a new con- version is initiated from the standby state, it will take up to two XIN clock cycles to begin. Actual conversion will use 1624 clock cycles before DRDY goes low to indicate that the serial port has been updated. See the Serial Interface Logic sec- tion of the data sheet for information on reading data from the serial port. In the event the A/D conversion command (CONV going positive) is issued during the conversion state, the current conversion will be terminated and a new conversion will be initiated. Voltage Reference The CS5509 uses a differential voltage reference input. The positive input is VREF+ and the nega- tive input is VREF-. The voltage between VREF+ and VREF- can range from 1 volt minimum to 3.6 volts maximum. The gain slope will track changes |
类似零件编号 - CS5509-ASZ |
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类似说明 - CS5509-ASZ |
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