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AD5203AN100 Datenblatt(PDF) 11 Page - Analog Devices |
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AD5203AN100 Datenblatt(HTML) 11 Page - Analog Devices |
11 / 12 page AD5203 –11– REV. 0 The data setup and data hold times in the specification table determine the data valid time requirements. The last eight bits of the data word entered into the serial register are held when CS returns high. At the same time CS goes high it gates the address decoder which enables one of four positive edge trig- gered RDAC latches, see Figure 36 detail. RDAC 1 RDAC 2 RDAC 4 AD5203 SDI CLK CS ADDR DECODE SERIAL REGISTER Figure 36. Equivalent Input Control Logic The target RDAC latch is loaded with the last six bits of the serial data word completing one RDAC update. Four separate 8-bit data words must be clocked in to change all four VR settings. SERIAL REGISTER SDI CK RS D Q SHDN CS CLK RS SDO Figure 37. Detail, SDO Output Schematic of the AD5203 All digital inputs are protected with a series input resistor and parallel Zener ESD structure shown in Figure 38. Applies to digital input pins CS, SDI, SDO, RS, SHDN, CLK. 1k LOGIC Figure 38. Equivalent ESD Protection Circuit DYNAMIC CHARACTERISTICS The total harmonic distortion plus noise (THD+N) measures 0.003% using an offset ground with a rail-to-rail OP279 invert- ing op amp test circuit, see Figure 30. Figure 15 plots THD versus frequency for both inverting and noninverting amplifier topologies. Thermal noise is primarily Johnson noise, typically 9 nV/ √Hz for the 10 kΩ version measured at 1 kHz. For the 100 k Ω device, thermal noise measures 29 nV/√Hz. Channel-to- channel crosstalk measures less than –65 dB at f = 100 kHz. To achieve this isolation, the extra ground pins (AGND) located between the potentiometer terminals (A, B, W) must be con- nected to circuit ground. The AGND and DGND pins should be at the same voltage potential. Any unused potentiometers in a package should be connected to ground. Power supply rejec- tion is typically –50 dB at 10 kHz (care is needed to minimize power supply ripple injection in high accuracy applications). |
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