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MAX5166NECM Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX5166NECM Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 12 page 32-Channel Sample/Hold Amplifier with Four Multiplexed Inputs 8 _______________________________________________________________________________________ MODE SELECT ADDRESS (A0–A2) OUTPUT INPUT tPW tAQ tDH tH tAP HOLD STEP tDS Figure 2. Timing Performance __________Applications Information Combining Inputs The MAX5166 contains a separate input for each 1-to-8 multiplexer. Externally connect the input pins to form larger multiplexers. When all four inputs are connected to the same source, the MAX5166 is functionally equiv- alent to the MAX5165, except the MAX5166 does not contain output clamping diodes. Control-Line Reduction The MAX5166 contains four separate 1-to-8 multiplexers and individual mode selectors for each multiplexer. When sampling one channel at a time, use an external 2-to-4 decoder (with active-low outputs) to reduce the number of digital control lines from seven to five (Figure 3). Single vs. Simultaneous Sampling Individually control the four mode/multiplexer-select pins to simultaneously sample on four channels, the same channel for each multiplexer (Figure 4). Each mode-select pin controls sampling on one of the 1-to-8 multiplexers, while the 3-bit address selects one of the eight channels on all the multiplexers (Tables 1 and 2). Setting any combination of the mode-select pin low enables sampling on the addressed channels for the selected multiplexers. Simultaneously sampling two or more channels reduces offset voltage but increases acquisition time. Multiply the single-channel acquisition time by the number of channels sampling. Multiplexed DAC Figure 5 shows a typical demultiplexer application. Different digital codes are converted by the digital-to- analog converter (DAC) and then stored on eight differ- ent channels, or as many as 32 different channels when all four inputs are active. The 100mV/sec (max) droop rate requires refreshing the hold capacitors every 100ms before the voltage drops by 1/2LSB for an 8-bit DAC with a 5V full-scale voltage. Powering the MAX5166 The MAX5166 does not require a special power-up sequence to avoid latchup. The device requires three separate supply voltages for operation; however, when one or two of the voltages are not available, DC-DC charge-pump (switched-capacitor) converters provide a simple, efficient solution. The MAX860 provides volt- age doubling or inversion, ideal for conversions from +5V to +10V or from +5V to -5V. The MAX860 also functions as a voltage divider to provide conversion from +10V to +5V. |
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