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LTC2400C Datasheet(PDF) 10 Page - Linear Technology |
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LTC2400C Datasheet(HTML) 10 Page - Linear Technology |
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10 / 40 page  10 LTC2400 an order of magnitude. The part remains in the sleep state as long as CS is logic HIGH. The conversion result is held indefinitely in a static shift register while the converter is in the sleep state. Once CS is pulled low, the device begins outputting the conversion result. There is no latency in the conversion result. The data output corresponds to the conversion just performed. This result is shifted out on the serial data out pin (SDO) under the control of the serial clock (SCK). Data is updated on the falling edge of SCK allowing the user to reliably latch data on the rising edge of SCK, see Figure 3. The data output state is concluded once 32 bits are read out of the ADC or when CS is brought HIGH. The device automatically initiates a new conversion cycle and the cycle repeats. Through timing control of the CS and SCK pins, the LTC2400 offers several flexible modes of operation (internal or external SCK and free-running conversion modes). These various modes do not require program- ming configuration registers; moreover, they do not dis- turb the cyclic operation described above. These modes of operation are described in detail in the Serial Interface Timing Modes section. Conversion Clock A major advantage delta-sigma converters offer over conventional type converters is an on-chip digital filter (commonly known as Sinc or Comb filter). For high resolution, low frequency applications, this filter is typi- cally designed to reject line frequencies of 50 or 60Hz plus their harmonics. In order to reject these frequencies in excess of 110dB, a highly accurate conversion clock is required. The LTC2400 incorporates an on-chip highly accurate oscillator. This eliminates the need for external frequency setting components such as crystals or oscilla- tors. Clocked by the on-chip oscillator, the LTC2400 rejects line frequencies (50 or 60Hz ±2%) a minimum of 110dB. Ease of Use The LTC2400 data output has no latency, filter settling or redundant data associated with the conversion cycle. There is a one-to-one correspondence between the conversion and the output data. Therefore, multiplexing an analog input voltage is easy. The LTC2400 performs offset and full-scale calibrations every conversion cycle. This calibration is transparent to the user and has no effect on the cyclic operation de- scribed above. The advantage of continuous calibration is extreme stability of offset and full-scale readings with re- spect to time, supply voltage change and temperature drift. Power-Up Sequence The LTC2400 automatically enters an internal reset state when the power supply voltage VCC drops below approxi- mately 2.2V. This feature guarantees the integrity of the conversion result and of the serial interface mode selec- tion which is performed at the initial power-up. (See the 2-wire I/O sections in the Serial Interface Timing Modes section.) When the VCC voltage rises above this critical threshold, the converter creates an internal power-on-reset (POR) signal with duration of approximately 0.5ms. The POR signal clears all internal registers. Following the POR signal, the LTC2400 starts a normal conversion cycle and follows the normal succession of states described above. The first conversion result following POR is accurate within the specifications of the device. Reference Voltage Range The LTC2400 can accept a reference voltage from 0V to VCC. The converter output noise is determined by the thermal noise of the front-end circuits, and as such, its value in microvolts is nearly constant with reference voltage. A decrease in reference voltage will not signifi- cantly improve the converter’s effective resolution. On the other hand, a reduced reference voltage will improve the overall converter INL performance. The recommended range for the LTC2400 voltage reference is 100mV to VCC. Input Voltage Range The converter is able to accommodate system level offset and gain errors as well as system level overrange situa- tions due to its extended input range, see Figure 2. The LTC2400 converts input signals within the extended input range of – 0.125 • VREF to 1.125 • VREF. APPLICATIONS INFORMATION |
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