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MAX1189BCUI Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX1189BCUI Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 15 page Transfer Function Figures 8, 9, and 10 show the MAX1179/MAX1187/ MAX1189’s output transfer functions. The MAX1179 and MAX1189 outputs are coded in offset binary, while the MAX1187 is coded in standard binary. Input Buffer Most applications require an input buffer amplifier to achieve 16-bit accuracy and prevent loading the source. Switch the channels immediately after acquisi- tion, rather than near the end of or after a conversion when the input signal is multiplexed. This allows more time for the input buffer amplifier to respond to a large step-change in input signal. The input amplifier must have a high enough slew rate to complete the required output voltage change before the beginning of the acquisition time. Figure 11 shows an example of this circuit using the MAX427. Figures 12a and 12b show how the MAX1179 and MAX1189 analog input current varies depending on whether the chip is operating or powered down. The part is fully powered down between conversions if the voltage at R/C is set high during the second falling edge of CS. The input current abruptly steps to the powered up value at the start of acquisition. This step in the input current can disrupt the ADC input, depend- ing on the driving circuit’s output impedance at high frequencies. If the driving circuit cannot fully settle by the end of acquisition time, the accuracy of the system can be compromised. To avoid this situation, increase the acquisition time, use a driving circuit that can settle within tACQ, or leave the MAX1179/MAX1189 powered up by setting the voltage at R/C low during the second falling edge of CS. Layout, Grounding, and Bypassing For best performance, use printed circuit (PC) boards. Do not run analog and digital lines parallel to each other, and do not lay out digital signal paths under- neath the ADC package. Use separate analog and dig- ital ground planes with only one point connecting the two ground systems (analog and digital) as close to the device as possible. Route digital signals far away from sensitive analog and reference inputs. If digital lines must cross analog lines, do so at right angles to minimize coupling digital noise 16-Bit, 135ksps, Single-Supply ADCs with Bipolar Analog Input Range ______________________________________________________________________________________ 11 Figure 9. MAX1187 Transfer Function OUTPUT CODE 65536 INPUT VOLTAGE (LSB) INPUT RANGE = 0 TO +10V 2 1 03 65535 65534 11 . . . 111 11 . . . 110 11 . . . 101 00 . . . 011 00 . . . 010 00 . . . 001 00 . . . 000 FULL-SCALE RANGE (FSR) = +10V 1LSB = FSR x VREF 65536 x 4.096 FULL-SCALE TRANSITION Figure 10. MAX1189 Transfer Function OUTPUT CODE -32768 +32768 INPUT VOLTAGE (LSB) INPUT RANGE = -10V TO +10V 0 -32766 -32767 -32765 +32767 +32766 -1 +1 11 . . . 1111 11 . . . 1110 11 . . . 1101 10 . . . 0001 10 . . . 0000 01 . . . 1111 00 . . . 0011 00 . . . 0010 00 . . . 0001 00 . . . 0000 FULL-SCALE RANGE (FSR) = +20V 1LSB = FSR x VREF 65536 x 4.096 FULL-SCALE TRANSITION Figure 8. MAX1179 Transfer Function OUTPUT CODE -32768 +32768 INPUT VOLTAGE (LSB) INPUT RANGE = -5V TO +5V 0 -32766 -32767 -32765 +32767 +32766 -1 +1 11 . . . 1111 11 . . . 1110 11 . . . 1101 10 . . . 0001 10 . . . 0000 01 . . . 1111 00 . . . 0011 00 . . . 0010 00 . . . 0001 00 . . . 0000 FULL-SCALE RANGE (FSR) = +10V 1LSB = FSR x VREF 65536 x 4.096 FULL-SCALE TRANSITION |
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