Multipoint wireless data acquition system for vehicles--Explanation Continued...

3. ADC0808:-

                             
The ADC0808, ADC0809 data acquisition component is a monolithic CMOS device with an 8-bit analog-to-digital converter, 8-channel multiplexer and microprocessor compatible control logic. The 8-bit A/D converter uses successive approximation as the conversion technique. The converter features a high impedance chopper stabilized

comparator, a 256R voltage divider with analog switch tree and a successive approximation register. The 8-channel multiplexer can directly access any of 8-single-ended analog signals.

4. Temp. Sensor (LM35): 

The LM35 series are precision integrated-circuit temperature sensors, whose output voltage is linearly proportional to the Celsius (Centigrade) temperature. The LM35 thus has an advantage over linear temperature sensors calibrated in ° Kelvin, as the user is not required to subtract a large constant voltage from its output to obtain convenient Centigrade scaling.
Specifications
Supply Voltage (Min) (V) -4
Supply Voltage (Max) (V) -30
Iq (Type) (uA) -56
Sensor Type -Analog
Operating Temperature Range (C) =-55 to 150