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AD7112CR Arkusz danych(PDF) 7 Page - Analog Devices |
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AD7112CR Arkusz danych(HTML) 7 Page - Analog Devices |
7 / 12 page AD7112 REV. 0 –7– Another error arises from the output amplifier’s input offset volt- age. The amplifier is operated with a fixed feedback resistance, but the equivalent source impedance (the AD7112 output im- pedance) varies as a function of the attenuation level. This has the effect of varying the noise gain of the amplifier thus creating a varying error due to amplifier offset voltage. It is recom- mended that an amplifier with less than 50 µV of input offset be used (such as the AD712 or ADOP07) in dc applications. Am- plifiers with a large input offset voltage may cause audible thumps in audio applications due to dc output changes. The AD7112 accuracy is specified and tested using only the internal feedback resistor. Any gain error (i.e., mismatch of RFB to the R–2R ladder) that may exist in the AD7112 D/A converter cir- cuit results in a constant attenuation error over the whole range. The AD7112 accuracy is specified relative to 0 dB attenuation, hence gain trim resistors can be used to adjust VOUT = VIN pre- cisely (i.e., 0 dB attenuation) with input code 00000000. For further information on gain error refer to the “CMOS DAC Ap- plication Guide” which is available from Analog Devices, Publi- cation Number G872b-8-1/89. TYPICAL PERFORMANCE CHARACTERISTICS 6 0 5 3 1 2 0 5 4 34 2 1 VIN – Volts TA = +25°C ALL DIGITAL INPUTS TIED TOGETHER Figure 6. Supply Current vs. Logic Input Level FREQUENCY – Hz OP275 C1 = 0pF 10 –30 104 107 0 –20 105 –10 OP275 C1 = 15pF AD712 C1 = 0pF AD712 C1 = 15pF 106 VDD = +5V TA = +25°C DATA INPUT CODE = 0000 0000 VIN = 1V rms Figure 7. Frequency Response with AD712 and OP275 10 90 100 0% 200ns 5V C1 = 0pF C1 = 15pF DATA CHANGE FROM 00H TO 80H 5V A1 0.8V Figure 4. Response of AD7112 with AD712 10 90 100 0% 200ns 5V C1 = 0pF C1 = 15pF DATA CHANGE FROM 00H TO 80H 5V A1 0.8V Figure 5. Response of AD7112 with OP275 |
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