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XRD5412AIP Datasheet(PDF) 10 Page - Exar Corporation |
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XRD5412AIP Datasheet(HTML) 10 Page - Exar Corporation |
10 / 16 page XRD5408/10/12 10 Rev. 1.20 port also has 4mA driving capability for greater fan-out when daisy-chaning to other digital inputs. Monotonicity The XRD5408/10/12 family of DACs are monotonic over the entire temperature range. Micro-Power Operation The XRD5408 is the lowest power in their class. The quiescent current rating does not include the reference ladder current. Power can be saved when the part is not in use by setting the DAC code to all “0”s assuming the output load is referenced to ground. This minimizes the DAC output load current. An analog switch placed in series with the reference ladder can toggle the reference voltage off when the circuit is inactive to minimize power consumption. Power Supply and Grounding Best parametric results are obtained by powering the XRD5408/10/12 family of DACs from an analog +5V power supply and analog ground. Digital power supplies and grounds should be separated or connected to the analog supplies and grounds only at the low-impedance power-supply source. This is best accomplished on a multilayer PCB with dedicated planes to ground and power. The DACs should be locally bypassed with both 0.1 F and 2.2 F capacitors mounted as close as possible to the power supply pin (VDD). Surface mount ceramic capacitors are recommended for low impedance, wide band power supply bypass. If only one +5V power supply is available for both analog and digital circuity isolate the analog power supply to the XRD5408/10/12 DAC with an inductor or ferrite bead before the local bypass capacitors. PERFORMANCE CHARACTERISTICS Figure 8. XRD5408 INL Figure 9. XRD5408 DNL CODE CODE --0.2 0 0.2 0.4 0 64 128 192 --0.1 0.0 0.2 0.35 255 0 64 128 192 255 |
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