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AD7111ABN bảng dữ liệu(PDF) 7 Page - Analog Devices |
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7 / 8 page AD7111/AD7111A REV. 0 –7– Another error arises from the output amplifier s input offset voltage. The amplifier is operated with a fixed feedback resis- tance, but the equivalent source impedance (the AD7111/ AD7111A output impedance) varies as a function of attenuation level. This has the effect of varying thc “noise” gain of the amplifier, thus creating a varying error due to amplifier offset voltage. It is recommended that an amplifier with less than 50 µV of input offset be used (such as the AD OP07 in dc appli- cations. Amplifiers with higher offset voltage may cause audible “thumps” in ac applications due to dc output changes. The AD7111/AD7111A accuracy is specified and tested using only the internal feedback resistor. Any gain error (i.e., mis- match of RFB to the R-2R ladder) that may exist in the AD7111/AD7111A D/A converter circuit results in a constant attenuation error over the whole range. The AD7111/AD7111A accuracy is specified relative to 0 dB attenuation, hence “Gain” trim resistors—R1 and R2 in Figure 1—can be used to adjust VOUT = VIN precisely (i.e., 0 dB attenuation) with input code 00000000. The accuracy and monotonic range specifications of the AD7111/AD7111A are not affected in any way by this gain trim procedure. For the AD7111/AD7111A L/C/U grades, suit- able values for R1 and R2 of Figure 1 are R1 = 500 Ω, R2 = 180 Ω; for the K/B/T grades, suitable value are R1 = 1000 Ω, R2 = 270 Ω. For additional information on gain error the reader is referred to the “CMOS DAC Application Guide,” available from Analog Devices, Inc., Publication Number G872b–8–1/89. Typical Performance Characteristics 6 0 5 3 1 1 2 0 5 4 4 3 2 INPUT VOLTAGE – Volts V IN APPLIED TO ALL DATA INPUTS V DD = +5V T A = +25°C CS = WR = 0V Figure 6. Typical Supply Current vs. Logic Input Level 0.4 –0.6 30 0.0 –0.4 3 –0.2 0 0.2 27 24 21 18 15 12 9 6 ATTENUATION – dB * * * * * * * * * * * * * ** * * * * ** * * ** * ** * * * * * * * ** * * * * * * * V DD = +5V T A = +25 °C Figure 7. Typical Attenuation Error for 0.75 dB Steps 1.0 –1.0 078 0.5 –0.5 6 0.0 66 72 60 48 42 36 30 24 18 12 54 84 ATTENUATION – dB T A = +85 °C T A = +25 °C DD V = +5V Figure 8. Typical Attenuation Error for 3 dB Steps vs. Temperature Figure 9. Accuracy Specification for K/B/T Grade Devices at TA = +25°C |
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