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DAC16GBC Scheda tecnica(PDF) 5 Page - Analog Devices |
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DAC16GBC Scheda tecnica(HTML) 5 Page - Analog Devices |
5 / 12 page Digital Input Considerations The threshold of the DAC16’s digital input circuitry is set at 1.4 V, independent of supply voltage. Hence, the digital inputs can interface with any type of 5 V logic. Illustrated in Figure 5 is the equivalent circuit of the digital inputs. Note that the indi- vidual input capacitance is approximately 7 pF. Q3 Q2 Q1 R2 75k R1 20k R3 28k TO DAC SWITCH +5V +0.7V –15V –0.7V DBX Figure 5. Equivalent Circuit of a DAC16 Digital Input This input capacitance can be used in conjunction with an ex- ternal R-C circuit for digital signal deskewing, if required. In applications where some of the DAC16’s digital inputs are not used, the recommended procedure to turn off one or more inputs is to connect each input line to +5 V as shown in Figure 6. DB0 DB1 +5V DAC16 Figure 6. Handling Unused DAC16 Digital Inputs Typical Performance Characteristics–DAC16 REV. B –5– REFERENCE CURRENT – mA –2.0 0.2 0.3 0.4 0.5 0.6 0.7 VCC = +5V VEE = –15V TA = +25 C –DNL +DNL –1.5 –1.0 –0.5 0 0.5 1.0 1.5 2.0 Figure 8. Differential Nonlinearity vs. IREF TEMPERATURE – C –40 –4 –20 0 20406080 –2 0 2 4 VCC = +5V VEE = –15V IREF = 0.5mA +INL –INL Figure 11. Integral Nonlinearity vs. Temperature TEMPERATURE – C 1.0 –40 0.8 0.6 0.4 0.2 0 –20 0 20406080 VCC = +5V VEE = –15V IREF = 0.5mA Figure 9. Zero Scale Output vs. Temperature TEMPERATURE – C –40 –1.5 –20 0 20406080 VCC = +5V VEE = –15V IREF = 0.5mA –1.0 –0.5 0 0.5 1.5 1.0 +DNL –DNL Figure 12. Differential Nonlinearity vs. Temperature REFERENCE CURRENT – mA –4 0.2 –3 –2 –1 0 1 2 3 4 0.3 0.4 0.5 0.6 0.7 VCC = +5V VEE = –15V TA = +25 C –INL +INL Figure 7. Integral Nonlinearity vs. IREF TEMPERATURE – C –40 –15 –20 0 20406080 VCC = +5V VEE = –15V IREF = 0.5mA –10 –5 0 5 15 10 Figure 10. Gain Error vs. Temperature |
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