Figure 8.27. There are 7 noninverting buffers on the left. They look similar to the inverter but there is no circle on the point of the triangle. Their 7 inputs are labeled collectively binary input. The buffer with the input labeled LSB, for least significant bit, has its output connected through a 640 k ohm resistor to the inverting input of an op amp. The output of the buffer from the next bit goes through a 320 k ohm resistor to the op amp. The next bit goes through a 160 k ohm resistor to the op amp. The next bit goes through an 80 k ohm resistor to the op amp. The next is a 40 k ohm, then a 20 k ohm, and finally the MSB, most significant bit, goes through its buffer and through a 10 k ohm resistor to the inverting input of the op amp. There is a 5 k ohm resistor from the output of the op amp to the inverting input. The noninverting input is grounded. The output of the op amp is labeled analog output. End verbal description.
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