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MAX1165AEUI Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX1165AEUI Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 15 page Low-Power, 16-Bit Analog-to-Digital Converter with Parallel Interface 8 _______________________________________________________________________________________ Detailed Description Converter Operation The MAX1165/MAX1166 use a successive-approxima- tion (SAR) conversion technique with an inherent track- and-hold (T/H) stage to convert an analog input into a 16-bit digital output. Parallel outputs provide a high- speed interface to most microprocessors (µPs). The Functional Diagram shows a simplified internal archi- tecture of the MAX1165/MAX1166. Figure 3 shows a typical application circuit for the MAX1166. Analog Input The equivalent input circuit is shown in Figure 4. A switched capacitor digital-to-analog converter (DAC) provides an inherent T/H function. The single-ended input is connected between AIN and AGND. Input Bandwidth The ADC’s input-tracking circuitry has a 4MHz small- signal bandwidth, so it is possible to digitize high- speed transient events and measure periodic signals with bandwidths exceeding the ADC’s sampling rate by using undersampling techniques. To avoid aliasing of unwanted high-frequency signals into the frequency band of interest, use anti-alias filtering. Analog Input Protection Internal protection diodes, which clamp the analog input to AVDD and/or AGND, allow the input to swing from AGND - 0.3V to AVDD + 0.3V, without damaging the device. If the analog input exceeds 300mV beyond the sup- plies, limit the input current to 10mA. D0–D15 D0–D15 1mA DGND DGND DVDD CLOAD = 20pF CLOAD = 20pF a) HIGH-Z TO VOH, VOL TO VOH, AND VOH TO HIGH-Z b) HIGH-Z TO VOL, VOH TO VOL, AND VOL TO HIGH-Z 1mA Figure 1. Load Circuits CS R/C REF POWER- DOWN BIT EOC D0–D15 HBEN* DATA VALID D8/D15– D0/D7* HIGH-/LOW- BYTE VALID HIGH-/LOW- BYTE VALID tACQ tCONV tCSH tCSL tDH tDO tDO1 tBR *HBEN AND BYTE-WIDE DATA BUS AVAILABLE ON MAX1166 ONLY. tDS tDV tEOC HIGH-Z HIGH-Z tBR Figure 2. MAX1165/MAX1166 Timing Diagram |
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