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LTC1599AIG Datasheet(PDF) 10 Page - Linear Technology |
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LTC1599AIG Datasheet(HTML) 10 Page - Linear Technology |
10 / 20 page 10 LTC1599 APPLICATIONS INFORMATION configured in unipolar or bipolar modes of operation (Figures 1 and 3). These are the changes the op amp can cause to the INL, DNL, unipolar offset, unipolar gain error, bipolar zero and bipolar gain error. Table 4 contains a partial list of LTC precision op amps recommended for use with the LTC1599. The two sets of easy-to-use design equations simplify the selection of op amps to meet the system’s specified error budget. Select the amplifier from Table 4 and insert the specified op amp parameters in either Table 2 or Table 3. Add up all the errors for each category to determine the effect the op amp has on the accuracy of the LTC1599. Arithmetic summation gives an (unlikely) worst-case effect. RMS summation produces a more realistic effect. Op amp offset will contribute mostly to output offset and gain error and has minimal effect on INL and DNL. For the LTC1599, a 500 µVopampoffsetwillcauseabout0.55LSB INL degradation and 0.15LSB DNL degradation with a 10V full-scale range (20V range in bipolar). For the LTC1599 configured in the unipolar mode, the same 500 µV op amp offset will cause a 3.3LSB zero-scale error and a 3.45LSB gain error with a 10V full-scale range. While not directly addressed by the simple equations in Tables 2 and 3, temperature effects can be handled just as easily for unipolar and bipolar applications. First, consult an op amp’s data sheet to find the worst-case VOS and IB over temperature. Then, plug these numbers in the VOS and IB equations from Table 2 or Table 3 and calculate the temperature induced effects. For applications where fast settling time is important, Application Note 74, entitled “ Component and Measure- ment Advances Ensure 16-Bit DAC Settling Time,” offers a thorough discussion of 16-bit DAC settling time and op amp selection. Table 4. Partial List of LTC Precision Amplifiers Recommended for Use with the LTC1599, with Relevant Specifications Amplifier Specifications VOLTAGE CURRENT SLEW GAIN BANDWIDTH tSETTLING POWER VOS IB AOL NOISE NOISE RATE PRODUCT with LTC1599 DISSIPATION AMPLIFIER µV nA V/mV nV/ √Hz pA/ √Hz V/ µs MHz µsmW LT1001 25 2 800 10 0.12 0.25 0.8 120 46 LT1097 50 0.35 1000 14 0.008 0.2 0.7 120 11 LT1112 (Dual) 60 0.25 1500 14 0.008 0.16 0.75 115 10.5/Op Amp LT1124 (Dual) 70 20 4000 2.7 0.3 4.5 12.5 19 69/Op Amp LT1468 75 10 5000 5 0.6 22 90 2.5 117 Table 2. Easy-to-Use Equations Determine Op Amp Effects on DAC Accuracy in Unipolar Applications OP AMP INL (LSB) DNL (LSB) UNIPOLAR OFFSET (LSB) UNIPOLAR GAIN ERROR (LSB) VOS (mV) VOS • 1.2 • (10V/VREF)VOS • 0.3 • (10V/VREF)VOS • 6.6 • (10V/VREF)VOS • 6.9 • (10V/VREF) IB (nA) IB • 0.00055 • (10V/VREF)IB • 0.00015 • (10V/VREF)IB • 0.065 • (10V/VREF)0 AVOL (V/V) 10k/AVOL 3k/AVOL 0 131k/AVOL Table 3. Easy-to-Use Equations Determine Op Amp Effects on DAC Accuracy in Bipolar Applications OP AMP INL (LSB) DNL (LSB) BIPOLAR ZERO ERROR (LSB) BIPOLAR GAIN ERROR (LSB) VOS1 (mV) VOS1 • 1.2 • (10V/VREF)VOS1 • 0.3 • (10V/VREF)VOS1 • 9.9 • (10V/VREF)VOS1 • 6.9 • (10V/VREF) IB1 (nA) IB1 • 0.00055 • (10V/VREF)IB1 • 0.00015 • (10V/VREF)IB1 • 0.065 • (10V/VREF)0 AVOL1 10k/AVOL 3k/AVOL1 0 196k/AVOL1 VOS2 (mV) 0 0 VOS2 • 6.7 • (10V/VREF)VOS2 • 13.2 • (10V/VREF) IB2 (nA) 0 0 IB2 • 0.065 • (10V/VREF)IB2 • 0.13 • (10V/VREF) AVOL2 0 0 65k/AVOL2 131k/AVOL2 |
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