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AD7537KPZ-REEL Datasheet(PDF) 6 Page - Analog Devices |
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AD7537KPZ-REEL Datasheet(HTML) 6 Page - Analog Devices |
6 / 10 page AD7537 REV. –6– SEPARATE AGND PINS The DACs in the AD7537 have separate AGND lines taken to pins AGNDA and AGNDB on the package. This increases the applications versatility of the part. Figure 6 is an example of this. DAC A is connected in standard fashion as a program- mable attenuator. AGNDA is at ground potential. DAC B is op- erating with AGND B biased to +5 V by the AD584. This gives an output range of +5 V to +10 V. Figure 6. AD7537 DACs Used in Different Modes PROGRAMMABLE OSCILLATOR Figure 7 shows a conventional state variable oscillator in which the AD7537 controls the programmable integrators. The fre- quency of oscillation is given by: f = 1 2 π R 6 R 5 × 1 C 1 ×C2× REQ1× REQ2 where REQ1 and REQ2 are the equivalent resistances of the DACs. The same digital code is loaded into both DACs. If C1 = C2 and R5 = R6, the expression reduces to f = 1 2 π × 1 C 1 REQ1 × REQ2 Since R EQ = 2n × R LAD N , (RLAD = DAC ladder resistance). f = 1 2 π × 1 C (N /2n )2 RLAD1 × RLAD2 = 1 2 π × D C 1 RLAD1 × RLAD2 D = N 2n ⎛ ⎝⎜ ⎞ ⎠⎟ = 1 2 π × D C × R LAD m where m is the DAC ladder resistance mismatch ratio, typically 1.005. With the values shown in Figure 7, the output frequency varies from 0 Hz to 1.38 kHz. The amplitude of the output signal at the A3 output is 10 V peak-to-peak and is constant over the entire frequency span. Figure 7. Programmable State Variable Oscillator A |
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