4-channel DAC Circuit Diagram

Circuit shown in Figure 1, this circuit can use a DAC chip, output 4-channel analog signal, the output multi-channel analog Select / distributor IC1 (4052) input A, B, control, chip select control side a "o", A-B "o", when the output signal of the A1 A2 and given away through the ICl relative to the input side, select the output of buffer A2 side after multiple in ICl and Rl fed back to the A1 anti- input, the loop gain is 1. C2 is a sample and hold capacitor. Output an output voltage and the DAC output voltage. A and B side of the control state change, you can select a different output, E ==: "1" the output side has not been selected due to the sampling of the role of the hold capacitor, the terminal voltage to maintain the value of the previous state. To enable the best performance, the sample hold capacitor C2 ~ C5, to use the leakage is very low capacitance, A2 ~ the A5 input end of the current can not be a typical value 1pA. P1 is used to adjust the output of A1 drift. R2 is used to in ICl switch output channels A1, a gain of 1. The current consumption of the circuit is less than 10mA, the UDAC should be between -3.5 and +3.5 V.




The circuit from http://www.hqew.net/circuit-diagram/4$2dchannel-DAC-Circuit-Diagram_2330.html