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LTC2436-1IGN Datasheet(PDF) 9 Page - Linear Technology |
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LTC2436-1IGN Datasheet(HTML) 9 Page - Linear Technology |
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9 / 28 page  LTC2436-1 9 24361f cycle. There is a one-to-one correspondence between the conversion and the output data. Therefore, multiplexing multiple analog voltages is easy. The LTC2436-1 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 LTC2436-1 automatically enters an internal reset state when the power supply voltage VCC drops below approxi- mately 2V. This feature guarantees the integrity of the conversion result and of the serial interface mode selec- tion. (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 a typical duration of 1ms. The POR signal clears all internal registers and selects channel 0. Following the POR signal, the LTC2436-1 starts a normal conversion cycle and follows the succession of states described above. The first conversion result following POR is accurate within the specifications of the device if the power supply voltage is restored within the operating range (2.7V to 5.5V) be- fore the end of the POR time interval. Reference Voltage Range This converter accepts a truly differential external refer- ence voltage. The absolute/common mode voltage speci- fication for the REF+ and REF– pins covers the entire range from GND to VCC. For correct converter operation, the REF+ pin must always be more positive than the REF– pin. The LTC2436-1 can accept a differential reference voltage from 0.1V to VCC. The converter output noise is deter- mined by the thermal noise of the front-end circuits, and as such, its value in nanovolts is nearly constant with reference voltage. A decrease in reference voltage will significantly improve the converter’s effective resolution, since the thermal noise (800nV) is well below the quanti- zation level of the device (75.6 µVfora5Vreference).Atthe minimum reference (100mV) the thermal noise remains constant at 800nV RMS (or 4.8 µVP-P), while the quantization is reduced to 1.5 µV per LSB. As a result, lower the reference improves the effective resolution for low level input voltages. Input Voltage Range The analog input is truly differential with an absolute/ common mode range for the CH0+/CH0– or CH1+/CH1– input pins extending from GND – 0.3V to VCC + 0.3V. Outside these limits, the ESD protection devices begin to turn on and the errors due to input leakage current increase rapidly. Within these limits, the LTC2436-1 con- verts the bipolar differential input signal, VIN = IN+ – IN–, from – FS = – 0.5 • VREF to +FS = 0.5 • VREF where VREF = REF+ – REF–, with the selected channel referred as IN+ and IN–. Outside this range, the converter indicates the overrange or the underrange condition using distinct output codes. Input signals applied to the analog input pins may extend by 300mV below ground and above VCC. In order to limit any fault current, resistors of up to 5k may be added in series with the pins without affecting the performance of the device. In the physical layout, it is important to main- tain the parasitic capacitance of the connection between these series resistors and the corresponding pins as low as possible; therefore, the resistors should be located as close as practical to the pins. The effect of the series resistance on the converter accuracy can be evaluated from the curves presented in the Input Current/Reference Current sections. In addition, series resistors will intro- duce a temperature dependent offset error due to the input leakage current. A 10nA input leakage current will develop a 1LSB offset error on an 8k resistor if VREF = 5V. This error has a very strong temperature dependency. Output Data Format The LTC2436-1 serial output data stream is 19 bits long. The first 3 bits represent status information indicating the conversion state, selected channel and sign. The next 16 bits are the conversion result, MSB first. The third and fourth bit together are also used to indicate an underrange condition (the differential input voltage is below –FS) or an overrange condition (the differential input voltage is above +FS). APPLICATIO S I FOR ATIO |
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