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AD7537UQ Datasheet(PDF) 6 Page - Analog Devices |
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AD7537UQ Datasheet(HTML) 6 Page - Analog Devices |
6 / 8 page AD7537 REV. 0 –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 R6 R5 × 1 C1 ×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 REQ = 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 |
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