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MC1408-8N Datasheet(PDF) 6 Page - NXP Semiconductors |
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MC1408-8N Datasheet(HTML) 6 Page - NXP Semiconductors |
6 / 10 page Philips Semiconductors Product data MC1408-8 8-bit multiplying D/A converter 2001 Aug 03 6 Output Current Range Any time the full-scale current exceeds 2 mA, the negative supply must be at least 8 V more negative than the output voltage. This is due to the increased internal voltage drops between the negative supply and the outputs with higher reference currents. Accuracy Absolute accuracy is the measure of each output current level with respect to its intended value, and is dependent upon relative accuracy, full-scale accuracy and full-scale current drift. Relative accuracy is the measure of each output current level as a fraction of the full-scale current after zero-scale current has been nulled out. The relative accuracy of the MC1408-8 is essentially constant over the operating temperature range because of the excellent temperature tracking of the monolithic resistor ladder. The reference current may drift with temperature, causing a change in the absolute accuracy of output current; however, the MC1408-8 has a very low full-scale current drift over the operating temperature range. The MC1408-8 series is guaranteed accurate to within ±1/2 LSB at +25 °C at a full-scale output current of 1.99 mA. The relative accuracy test circuit is shown in Figure 6. The 12-bit converter is calibrated to a full-scale output current of 1.99219 mA; then the MC1408-8’s full-scale current is trimmed to the same value with R14 so that a zero value appears at the error amplifier output. The counter is activated and the error band may be displayed on the oscilloscope, detected by comparators, or stored in a peak detector. Two 8-bit D-to-A converters may not be used to construct a 16-bit accurate D-to-A converter. 16-bit accuracy implies a total of ±1/2 part in 65,536, or ±0.00076%, which is much more accurate than the ±0.19% specification of the MC1408-8. Monotonicity A monotonic converter is one which always provides an analog output greater than or equal to the preceding value for a corresponding increment in the digital input code. The MC1408-8 is monotonic for all values of reference current above 0.5 mA. The recommended range for operation is a DC reference current between 0.5 mA and 4.0 mA. Settling Time The worst case switching condition occurs when all bits are switched on, which corresponds to a low-to-high transition for all input bits. This time is typically 70 ns for settling to within 1/2LSB for 8-bit accuracy. This time applies when RL < 500 Ω and CO < 25 pF. The slowest single switch is the least significant bit, which typically turns on and settles in 65 ns. In applications where the D-to-A converter functions in a positive going ramp mode, the worst-case condition does not occur and settling times less than 70 ns may be realized. Extra care must be taken in board layout since this usually is the dominant factor in satisfactory test results when measuring settling time. Short leads, 100 µF supply bypassing for low frequencies, minimum scope lead length, good ground planes, and avoidance of ground loops are all mandatory. MSB A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12 12-BIT D-TO-A CONVERTER ERROR MAX) 0 TO +10V OUTPUT 5k 50k ERROR (1V = 1%) NE530 LSB 100 950 5 6 7 8 9 10 11 12 MSB LSB MC1408 8-BIT COUNTER 15 16 3 2 1 4 14 13 – + 1k C ( ±0.02% VCC VREF = 2V VEE 0.1 µF R14 SL00053 Figure 6. Relative Accuracy |
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