| ??? 12/12/05 19:13 Read: times |
#105085 - More! Responding to: ???'s previous message |
Steve M. Taylor said:
KAI said:
I would highly recommend to use a separate circuit to read the temperature sensor and to transmit the signal galvanically isolated to your micro board. I think I'd just pot the sensor in a plastic box ! Hello Kai and Steve Temperature resolution is very very good And i am Extremely sure it can meet my demands This Adc has self calibration mode,input buffering,programmable gain,.... Analog Device said:
The AD7715 is a complete analog front end for low frequency measurement applications. The part can accept low level input signals directly from a transducer and outputs a serial digital word. It employs a sigma-delta conversion technique to realize up to 16 bits of no missing codes performance. The input signal is applied to a proprietary programmable gain front end based around an analog modulator. The modulator output is processed by an on-chip digital filter. The first notch of this digital filter can be programmed via the on-chip control register allowing adjustment of the filter cutoff and output update rate. The AD7715 features a differential analog input as well as a differential reference input. It operates from a single supply (+3Ê V or +5Ê V). It can handle unipolar input signal ranges of 0 mV to +20Ê mV, 0 mV to +80Ê mV, 0 V to +1.25Ê V and 0 V to +2.5Ê V. It can also handle bipolar input signal ranges of ±20Ê mV, ±80Ê mV,±1.25Ê V and ±2.5Ê V. These bipolar ranges are referenced to the negative input of the differential analog input. The AD7715 thus performs all signal conditioning and conversion for a singlechannel system. The AD7715 is ideal for use in smart, microcontroller or DSP based systems. It features a serial interface that can be configured for three-wire operation. Gain settings, signal polarity and update rate selection can be configured in software using the input serial port. The part contains self-calibration and system calibration options to eliminate gain and offset errors on the part itself or in the system. Also The MCU's program has written carefully,for example even if 0.1 celsius degree temp sensor goes above adjusted temp heater became turn off. Any new comment will be appreciate Mehdi |
