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CXD2073 Datasheet(PDF) 6 Page - Sony Corporation |
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CXD2073 Datasheet(HTML) 6 Page - Sony Corporation |
6 / 11 page – 6 – CXD2073Q Application Circuit for D/A Converter DAVD DAVS : analog power supply 5V : analog ground AYO VRF IRF ACO VG VB 0.1µ 0.1µ 3.3k (R') 200 (R) C OUT Y OUT 200 (R) 0.1µ 2k 3k 0.1µ 10µ 6 8 7 9 12 4 10 11 • Method of selecting output resistance The CXD2073Q has a built-in current output-type D/A converter. To obtain the output voltages, connect resistors to AYO and ACO pins. VFS = IFS × R Here, VFS is output full-scale voltage, IFS is output full-scale current, and R is the output resistance connected to each IO. In addition, connect a resistance of 16 times the output resistor to the reference current pin IRF. In the case where the value comes to be impractical, use a value of resistance as close to the value calculated as possible. At that time, VFS = VRF × 16 × R/R'. R is the output resistance connected to each IO, R' is the resistance connected to IRF, and VRF is the VRF pin voltage. Power consumption can be reduced by using higher resistance values, but then glitch energy and data settling time increase contrastingly. Select optimum resistance values according to the system applications. In case of the circuit above, VFS = 2 [V] × 16 × 0.2k/3.3k ≈ 1.93 [V], IFS = 1.93/0.2k ≈ 9.65 [mA]. |
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Similar Description - CXD2073 |
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