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MX7575 Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MX7575 Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 12 page ______________ Typical Applications Unipolar Operation Figure 16a shows the analog circuit connections for unipolar operation, and Figure 16b shows the nominal transfer characteristic for unipolar operation. Since the offset and full-scale errors of the MX7575/MX7576 are very small, it is not necessary to null these errors in most cases. If calibration is required, follow the steps in the sections below. Offset Adjust The offset error can be adjusted by using the offset trim capability of an op amp (when it is used as a voltage fol- lower) to drive the analog input, AIN. The op amp should have a common-mode input range that includes 0V. Set its initial input to 4.8mV (1/2LSB), while varying its offset until the ADC output code flickers between 0000 0000 and 0000 0001. Full-Scale Adjustment Make the full-scale adjustment by forcing the analog input, AIN, to 2.445V (FS - 3/2LSB). Then vary the refer- ence input voltage until the ADC output code flickers between 1111 1110 and 1111 1111. Bipolar Operation Figure 18a shows an example of the circuit connection for bipolar operation, and Figure 18b shows the nominal transfer characteristic for bipolar operation. The output code provided by the MX7575 is offset binary. The ana- log input range for this circuit is ±2.46V (1LSB = 19.22mV), even though the voltage appearing at AIN is in the 0V to 2.46V range. In most cases, the MX7575 is accurate enough that calibration will not be necessary. If calibration is not needed, resistors R1–R7 should have a 0.1% tolerance, with R4 and R5 replaced by one 10k Ω resistor, and R2 and R3 with one 1k Ω resistor. If calibra- tion is required, follow the steps in the sections below. Offset Adjust Adjust the offset error by applying an analog input volt- age of 2.43V (+FS - 3/2LSB). Then adjust resistor R5 until the output code flickers between 1111 1110 and 1111 1111. Full-Scale Adjust Null the full-scale error by applying an analog input voltage of -2.45V (-FS + 1/2LSB). Then adjust resistor R3 until the output code flickers between 0000 0000 and 0000 0001. CMOS, µP-Compatible, 5µs/10µs, 8-Bit ADCs 10 ______________________________________________________________________________________ 16 17 15 5 4 1 2 3 9 18 +5V +5V 47 µF 47 µF 0.1 µF 3.3k +1.23V 0.1 µF +5V 2.46V(max) + - D7–D0 DATA OUT CONTROL INPUTS CCLK 100pF, 1% RCLK 100k, 2% AIN REF AGND CLK BUSY CS RD TP/ MODE VDD MX7575 MX7576 0000 0011 0000 0010 0000 0001 0000 0000 1111 1111 1111 1110 1111 1101 1LSB 2LSBs 3LSBs 0 AIN, INPUT VOLTAGE (IN TERMS OF LSBs) FS - 1LSB FULL-SCALE TRANSITION (FS - 3/2LSB) OUTPUT CODE FS = 2VREF 1LSB = ––– 2FS 256 11 12 13 14 7 -55 -25 25 75 8 10 AMBIENT TEMPERATURE (°C) 0 125 100 50 9 MX7576 MX7575 RCLK = 100kΩ CCLK = 100pF Figure 16a. Unipolar Configuration Figure 16b. Nominal Transfer Characteristic for Unipolar Operation Figure 17. Typical Conversion Times vs. Temperature Using Internal Clock |
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Similar Description - MX7575 |
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