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I am working which with sensors on raspberry pi.I am able to connect the all digital sensors with raspbeery pi.How to start with analog sensors.Should i require a Analog to Digital converter IC?

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Yes, you will need an ADC, the Pi has no analogue inputs or outputs.

A popular choice would be an MCP300X (10 bit resolution where X is the number of channels) or MCP320X (12 bit resolution). They connect via the Pi's SPI bus (GPIO 7-11)

You will find plenty of software and tutorials for those chips and the Raspberry Pi.

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  • i found a tutorial in which ADC is not used for a temperature .please through this link sensor.youtube.com/watch?v=S2v1VNgHnvI –  Tarun May 24 '17 at 12:09
  • You need an ADC for analogue sensors. The DS18B20 is a digital sensor. – joan May 24 '17 at 12:34

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