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DAC1020 数据表(PDF) 5 Page - Texas Instruments |
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DAC1020 数据表(HTML) 5 Page - Texas Instruments |
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5 / 16 page  Typical Applications The following applications are also valid for 12-bit systems using the DAC1220 and 2 additional digital inputs Operational Amplifier Bias Current ( Figure 3 ) The op amp bias current Ib flows through the 15k internal feedback resistor BI-FET op amps have low Ib and there- fore the 15k c Ib error they introduce is negligible they are strongly recommended for the DAC1020 applications VOS Considerations The output impedance ROUT of the DAC is modulated by the digital input code which causes a modulation of the op- erational amplifier output offset It is therefore recommend- ed to adjust the op amp VOS ROUT is E15k if more than 4 digital inputs are high ROUT is E45k if a single digital input is high and ROUT approaches infinity if all inputs are low Operational Amplifier VOS Adjust (Figure 3 ) Connect all digital inputs A1 – A10 to ground and adjust the potentiometer to bring the op amp VOUT pin to within g1 mV from ground potential If VREF is less than 10V a finer VOS adjustment is required It is helpful to increase the reso- lution of the VOS adjust procedure by connectinga1kX resistor between the inverting input of the op amp to ground After VOS has been adjusted remove the 1 kX Full-Scale Adjust ( Figure 4 ) Switch high all the digital inputs A1 – A10 and measure the op amp output voltage Use a 500X potentiometer as shown to bring llVOUTll to a voltage equal to VREF c 10231024 SELECTING AND COMPENSATING THE OPERATIONAL AMPLIFIER Op Amp Family CF Ri PVW Circuit Settling Circuit Small Time ts Signal BW LF357 10 pF 24k 25k Va 15 ms1M LF356 22 pF % 25k Va 3 ms 05M LF351 24 pF % 10k Vb 4 ms 05M LM741 0 % 10k Vb 40 ms 200 kHz TLH5689 – 3 VOUT ebVREF A12aA24aA38a A10 1024 J b 10V s VREF s 10V 0 s VOUT s b 1023 1024 VREF where AN e 1 if the AN digital input is high AN e 0 if the AN digital input is low FIGURE 3 Basic Connection Unipolar or 2-Quadrant Multiplying Configuration (Digital Attenuator) http www nationalcom 4 |
类似零件编号 - DAC1020_11 |
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类似说明 - DAC1020_11 |
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