For a 5-bit R-2R ladder D/A converter which has digital input of 10101, the analog output value is (Assume 0 = 0 V and 1 = + 10 V, R= 3R)

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ESE Electronics 2014 Paper 2: Official Paper
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  1. -3.32 V
  2. -4.32  
  3. -19.68
  4. -7.48

Answer (Detailed Solution Below)

Option 3 : -19.68
Free
ST 1: UPSC ESE (IES) Civil - Building Materials
20 Qs. 40 Marks 24 Mins

Detailed Solution

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R-2R Ladder DAC:

VO = Gain × Decimal Equivalent

Decimal Equivalent will be:

Gain = 

Analysis:

Given,

Binary input = 10101

Vref = +10 v

Rf = 3R

VO = Gain × Decimal Equivalent

= -19.68 Volts

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