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MAX189CCWE Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX189CCWE Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 20 page +5V, Low-Power, 12-Bit Serial ADCs _______________________________________________________________________________________ 7 PIN DIP WIDE SO NAME FUNCTION 11 VDD Supply voltage, +5V ±5% 2 3 AIN Sampling analog input, 0V to VREF range 36 SHDN Three-level shutdown input. Pulling SHDN low shuts the MAX187/MAX189 down to 10µA (max) supply current. Both MAX187 and MAX189 are fully opera- tional with either SHDN high or floating. For the MAX187, pulling SHDN high enables the internal reference, and letting SHDN float disables the internal reference and allows for the use of an external reference. 4 8 REF Reference voltage—sets analog voltage range and functions as a 4.096V output for the MAX187 with enabled internal reference. REF also serves as a +2.5V to VDD input for a precision reference for both MAX187 (disabled internal reference) and MAX189. Bypass with 4.7µF if internal reference is used, and with 0.1µF if an external reference is applied. 5 — GND Analog and digital ground — 10 AGND Analog ground — 11 DGND Digital ground 6 12 DOUT Serial data output. Data changes state at SCLK’s falling edge. 715 CS Active-low chip select initiates conversions on the falling edge. When CS is high, DOUT is high impedance. 8 16 SCLK Serial clock input. Clocks data out with rates up to 5MHz. — 2,4,5,7,9,13,14 N.C. Not internally connected. Connect to AGND for best noise performance. _______________________________________________________________________Pin Description _______________Detailed Description Converter Operation The MAX187/MAX189 use input track/hold (T/H) and successive approximation register (SAR) circuitry to convert an analog input signal to a digital 12-bit output. No external hold capacitor is needed for the T/H. Figures 3a and 3b show the MAX187/MAX189 in their simplest configuration. The MAX187/MAX189 convert input signals in the 0V to VREF range in 10µs, including T/H acquisition time. The MAX187’s internal reference is trimmed to 4.096V, while the MAX189 requires an external reference. Both devices accept external refer- ence voltages from +2.5V to VDD. The serial interface requires only three digital lines, SCLK, CS, and DOUT, and provides easy interface to microprocessors ( µPs). Both converters have two modes: normal and shut- down. Pulling SHDN low shuts the device down and reduces supply current to below 10µA, while pulling SHDN high or leaving it floating puts the device into the operational mode. A conversion is initiated by CS falling. The conversion result is available at DOUT in unipolar serial format. A high bit, signaling the end of conversion (EOC), followed by the data bits (MSB first), make up the serial data stream. The MAX187 operates in one of two states: (1) internal reference and (2) external reference. Select internal reference operation by forcing SHDN high, and external reference operation by floating SHDN. Analog Input Figure 4 illustrates the sampling architecture of the ADC’s analog comparator. The full-scale input voltage depends on the voltage at REF. REFERENCE ZERO FULL SCALE SCALE Internal Reference 0V +4.096V (MAX187 only) External Reference 0V VREF For specified accuracy, the external reference voltage range spans from +2.5V to VDD. |
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Similar Description - MAX189CCWE |
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