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LTC1595 Datasheet(PDF) 10 Page - Linear Technology |
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LTC1595 Datasheet(HTML) 10 Page - Linear Technology |
10 / 12 page 10 LTC1595/LTC1596/LTC1596-1 Bipolar (4-Quadrant Multiplying) Mode (VOUT = – VREF to VREF) The LTC1595/LTC1596 can be used with a dual op amp and three external resistors to provide 4-quadrant multi- plying operation as shown in Figure 2 (last page). With a fixed 10V reference, the circuits shown give a precision bipolar –10V to 10V output swing. Using the LTC1596-1 will cause the power-on reset and clear pin to reset the DAC to midscale (bipolar zero). Op Amp Selection Because of the extremely high accuracy of the 16-bit LTC1595/LTC1596, 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. Op amp offset will contribute mostly to output offset and gain and will have minimal effect on INL and DNL. For example, a 500 µV op amp offset will cause about 0.55LSB APPLICATIONS INFORMATION INL degradation and 0.15LSB DNL degradation with a 10V full-scale range. The main effects of op amp offset will be a degradation of zero-scale error equal to the op amp offset, and a degradation of full-scale error equal to twice the op amp offset. For example, the same 500 µV op amp offset will cause a 3.3LSB zero-scale error and a 6.5LSB full-scale error with a 10V full-scale range. Op amp input bias current (IBIAS) contributes only a zero- scale error equal to IBIAS(RFB) = IBIAS(RREF) = IBIAS(7k). Table 2 shows a selection of LTC op amps which are suitable for use with the LTC1595/LTC1596. For a thor- ough discussion of 16-bit DAC settling time and op amp selection, refer to Application Note 74, “ Component and Measurement Advances Ensure 16-Bit DAC Settling Time.” Grounding As with any high resolution converter, clean grounding is important. A low impedance analog ground plane and star grounding should be used. IOUT2 (LTC1596) and GND (LTC1595) must be tied to the star ground with as low a resistance as possible. Table 2. 16-Bit Settling Time for Various Amplifiers Driven by the LT1595 DAC. LT1468 (Shaded) Offers Fastest Settling Time While Maintaining Accuracy Over Temperature CONSERVATIVE SETTLING TIME AMPLIFIER AND COMPENSATION VALUE COMMENTS LT1001 120 µs 100pF Good Low Speed Choice LT1007 19 µs 100pF IB Gives ≈1LSB Error at 25°C LT1013 75 µs 150pF ≈1LSB Error Due to VOS over Temperature LT1077 200 µs 100pF LT1097 120 µs 75pF Good Low Speed Choice LT1112 120 µs 100pF Good Low Speed Choice Dual LT1178 450 µs 100pF Low Power Dual LT1468 2.5 µs 30pF Fastest Settling with 16-Bit Performance |
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