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MAX1284BCSA Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX1284BCSA Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 15 page Detailed Description Converter Operation The MAX1284/MAX1285 use an input T/H and succes- sive-approximation register (SAR) circuitry to convert an analog input signal to a digital 12-bit output. Figure 3 shows the MAX1284/MAX1285 in its simplest configu- ration. The internal reference is trimmed to +2.5V. The serial interface requires only three digital lines (SCLK, CS, and DOUT) and provides an easy interface to microprocessors (µPs). The MAX1284/MAX1285 have two modes: normal and shutdown. Pulling SHDN low shuts the device down and reduces supply current to below 2µA (typ), while pulling SHDN high puts the device into operational mode. Pulling CS low initiates a conversion that is driven by SCLK. The conversion result is available at DOUT in unipolar serial format. The serial data stream consists of three zeros, followed by the data bits (MSB first). All transitions on DOUT occur 20ns after the rising edge of SCLK. Figures 8 and 9 show the interface timing information. Analog Input Figure 4 illustrates the sampling architecture of the ADC’s comparator. The full-scale input voltage is set by the internal reference (VREF = +2.5V). Track/Hold In track mode, the analog signal is acquired and stored in the internal hold capacitor. In hold mode, the T/H switch opens and maintains a constant input to the ADC’s SAR section. During acquisition, the analog input (AIN) charges capacitor CHOLD. Bringing CS low, ends the acquisition interval. At this instant, the T/H switches the input side of CHOLD to GND. The retained charge on CHOLD rep- resents a sample of the input, unbalancing node ZERO at the comparator’s input. In hold mode, the capacitive digital-to-analog converter (DAC) adjusts during the remainder of the conversion cycle to restore node ZERO to 0 within the limits of 12- bit resolution. This action is equivalent to transferring a charge from CHOLD to the binary-weighted capacitive DAC, which in turn forms a digital representation of the analog input signal. At the conversion’s end, the input 400ksps/300ksps, Single-Supply, Low-Power, Serial 12-Bit ADCs with Internal Reference 8 _______________________________________________________________________________________ DOUT DOUT 6k Ω DGND CLOAD = 20pF CLOAD = 20pF 6k Ω DGND VDD b) High-Z to VOL and VOH to VOL a) High-Z to VOH and VOL to VOH Figure 1. Load Circuits for DOUT Enable Time DOUT DOUT 6k Ω DGND CLOAD = 20pF CLOAD = 20pF 6k Ω DGND VDD b) VOL to High-Z a) VOH to High-Z Figure 2. Load Circuits for DOUT Disable Time |
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