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DAC16 Datasheet(PDF) 6 Page - Analog Devices |
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DAC16 Datasheet(HTML) 6 Page - Analog Devices |
6 / 12 page DAC16–Typical Performance Characteristics REV. B –6– APPLICATIONS Power Supplies, Bypassing, and Grounding All precision converter products require careful application of good grounding practices to maintain full-rated performance. As is always the case with analog circuits operating in digital envi- ronments, digital noise is prevalent; therefore, special care must be taken to ensure that the DAC16’s inherent precision is main- tained. This means that particularly good engineering judgment should be exercised when addressing the power supply, ground- ing, and bypassing issues using the DAC16. The DAC16 was designed to operate from +5 V and –15 V supplies. The +5 V supply primarily powers the digital portion of the DAC16 and can consume 20 mA, maximum. Although very little +5 V supply current is used by the reference amplifier, large amounts of digital noise present on the +5 V supply can introduce analog errors. It is, therefore, very important that the +5 V supply be well filtered and regulated. The –15 V supply provides most of the current for the reference amplifier and all of the current for the internal DAC. Although the maximum current in this supply is 10 mA, it must provide a low imped- ance path for the DAC switch currents. Therefore, it too must be well filtered and regulated. The DAC16 includes two ground connections in order to mini- mize system accuracy degradation arising from grounding er- rors. The two ground pins are designated DGND (Pin 2) and AGND (Pin 22). The DGND pin is the return for the digital circuit sections of the DAC and serves as their input threshold reference point. Thus, DGND should be connected to the same ground as the circuitry that drives the digital inputs. Pin 22, AGND, serves as the reference point for the 9-bit lower-order DAC as well as the common for the reference am- plifier, REFGND (Pin 21). This pin should also serve as the reference point for all analog circuitry associated with the DAC16. Therefore, to minimize any errors, it is recommended that AGND connection on the DAC16 be connected to a high quality analog ground. If the system contains any analog signal path carrying a significant amount of current, then that path should have its own return connection to Pin 22. It is often advisable to maintain separate analog and digital grounds throughout a complete system, tying them common to one place only. If the common tie point is remote and an acci- dental disconnection of that one common tie point were to oc- cur due to card removal with power on, a large differential voltage between the two commons could develop. To protect devices that interface to both digital and analog parts of the TEMPERATURE – C –40 0 –20 0 20406080 5 10 15 20 ICC, LOGIC BITS = HIGH IEE , LOGIC BITS = LOW IEE , LOGIC BITS = HIGH ICC, LOGIC BITS = LOW Figure 13. Supply Current vs. Temperature BURN-IN TIME – Hours –1.5 0 –1.0 –0.5 0 0.5 1.0 1.5 200 400 600 800 1000 1200 VCC = +5V, VEE = –15V TA = +25 C, IREF = 0.5mA WORST CASE + DNL TYPICAL + DNL TYPICAL – DNL WORST CASE – DNL Figure 16. Differential Nonlinearity vs. Time Accelerated by Burn-In LOGIC INPUT VOLTAGE – V ALL DATA BITS 20 0 01 5 234 15 10 5 VEE = –15V VCC = +5V TA = +25 C Figure 14. VCC Supply Current vs. Logic Input Voltage, All Data Bits BURN-IN TIME – Hours –4 0 –3 –2 0 5 4 6 200 400 600 800 1000 1200 VCC = +5V, VEE = –15V TA = +25 C, IREF = 0.5mA WORST CASE + INL TYPICAL + INL TYPICAL – INL WORST CASE – INL –1 3 2 1 Figure 17. Integral Nonlinearity vs Time Accelerated by Burn-In TEMPERATURE – C 50 –40 40 30 20 10 0 –20 0 20406080 VCC = +5V VEE = –15V VIN = +5V DB0 – DB4 DB5 – DB15 Figure 15. Digital Input Current vs. Temperature BURN-IN TIME – Hours –30 0 –20 –10 0 110 120 130 200 400 600 800 1000 1200 VCC = +5V, VEE = –15V TA = +25 C, IREF = 0.5mA WORST CASE + GAIN ERROR TYPICAL GAIN ERROR WORST CASE – GAIN ERROR Figure 18. Gain Error vs. Time Accelerated by Burn-In |
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