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DAC7541AKP Datasheet(PDF) 8 Page - Burr-Brown (TI) |
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DAC7541AKP Datasheet(HTML) 8 Page - Burr-Brown (TI) |
8 / 10 page 8 ® DAC7541A DIGITALLY CONTROLLED GAIN BLOCK The DAC7541A may be used in a digitally controlled gain block as shown in Figure 7. This circuit gives a range of gain from one (all bits = one) to 4096 (LSB = one). The transfer function is: All bits off is an illegal state, as division by zero is impos- sible (no op amp feedback). Also, errors increase as gain increases, and errors are minimized at major carries (only one bit on at a time). V OUT = + + + • • • + B 1 2 B 3 8 B 2 4 B 12 4096 –V IN ( ) FIGURE 7. Digitally Programmable Gain Block. Bits 1 to 12 V OUT OPA604 DAC7541A 23 1 18 17 16 V DD V IN |
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