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LTC2754BIUKG-16TRPBF Datasheet(PDF) 20 Page - Linear Technology |
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LTC2754BIUKG-16TRPBF Datasheet(HTML) 20 Page - Linear Technology |
20 / 28 page LTC2754 20 2754f APPLICATIONS INFORMATION Op Amp Selection Because of the extremely high accuracy of the 16-bit LTC2754-16, careful thought should be given to op amp selection in order to achieve the exceptional performance of which the part is capable. Fortunately, the sensitivity of INL and DNL to op amp offset has been greatly reduced compared to previous generations of multiplying DACs. Tables 4 and 5 contain equations for evaluating the effects of op amp parameters on the LTC2754’s accuracy when programmed in a unipolar or bipolar output range. These are the changes the op amp can cause to the INL, DNL, unipolar offset, unipolar gain error, bipolar zero and bipolar gain error. Tables 4 and 5 can also be used to determine the effects of op amp parameters on the LTC2754-12. However, the results obtained from Tables 4 and 5 are in 16-bit LSBs. Divide these results by 16 to obtain the correct LSB sizing. Table 6 contains a partial list of LTC precision op amps recommended for use with the LTC2754. The easy-to-use design equations simplify the selection of op amps to meet Table 4. Coefficients for the Equations in Table 5 OUTPUT RANGE A1 A2 A3 A4 A5 5V 1.1 2 1 1 10V 2.2 3 0.5 1.5 ±5V 2 2 1 1 1.5 ±10V 4 4 0.83 1 2.5 ±2.5V 1 1 1.4 1 1 –2.5V to 7.5V 1.9 3 0.7 0.5 1.5 A3 • VOS1 • 19.8 • IB1 • 0.13 • 0 A4 • VOS2 • 13.1 • A4 • IB2 • 0.13 • A4 • () 5V VREF () 5V VREF () 16.5k AVOL1 OP AMP VOS1 (mV) IB1 (nA) AVOL1 (V/V) VOS2 (mV) IB2 (mV) AVOL2 (V/V) VOS1 • 3.2 • IB1 • 0.0003 • A1 • 0 0 0 INL (LSB) () 5V VREF () 5V VREF () 1.5k AVOL1 () 66k AVOL2 () 131k AVOL1 () 131k AVOL1 () 131k AVOL2 () 131k AVOL2 VOS1 • 0.82 • IB1 • 0.00008 • A2 • 0 0 0 DNL (LSB) () 5V VREF () 5V VREF A3 • VOS1 • 13.2 • IB1 • 0.13 • 0 0 0 0 UNIPOLAR OFFSET (LSB) () 5V VREF () 5V VREF () 5V VREF VOS1 • 13.2 • IB1 • 0.0018 • A5 • VOS2 • 26.2 • IB2 • 0.26 • BIPOLAR GAIN ERROR (LSB) () 5V VREF () 5V VREF () () () 5V VREF () 5V VREF BIPOLAR ZERO ERROR (LSB) UNIPOLAR GAIN ERROR (LSB) () 5V VREF () 5V VREF () 5V VREF () 5V VREF () 5V VREF VOS1 • 13.2 • IB1 • 0.0018 • A5 • VOS2 • 26.2 • IB2 • 0.26 • Table 5. Easy-to-Use Equations Determine Op Amp Effects on DAC Accuracy in All Output Ranges (Circuit of Page 1). Subscript 1 Refers to Output Amp, Subscript 2 Refers to Reference Inverting Amp. Table 6. Partial List of LTC Precision Amplifiers Recommended for Use with the LTC2754 with Relevant Specifications AMPLIFIER AMPLIFIER SPECIFICATIONS VOS μV IB nA AVOL V/mV VOLTAGE NOISE nV/√Hz CURRENT NOISE pA/√Hz SLEW RATE V/μs GAIN BANDWIDTH PRODUCT MHz tSETTLING with LTC2755 μs POWER DISSIPATION mW 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 2 117 LT1469 (Dual) 125 10 2000 5 0.6 22 90 2 123/Op Amp |
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