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MAX1277 Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX1277 Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 18 page 1.5Msps, Single-Supply, Low-Power, True- Differential, 12-Bit ADCs with Internal Reference _______________________________________________________________________________________ 9 Pin Description PIN NAME FUNCTION 1 AIN- Negative Analog Input 2 REF Reference Voltage Output. Internal 2.048V reference output. Bypass REF with a 0.01µF capacitor and a 4.7µF capacitor to RGND. 3 RGND Reference Ground. Connect RGND to GND. 4VDD Positive Analog Supply Voltage (+2.7V to +3.6V). Bypass VDD with a 0.01µF capacitor and a 10µF capacitor to GND. 5, 11 N.C. No Connection 6 GND Ground. GND is internally connected to EP. 7VL Positive Logic Supply Voltage (1.8V to VDD). Bypass VL with a 0.01µF capacitor and a 10µF capacitor to GND. 8 DOUT Serial Data Output. Data is clocked out on the rising edge of SCLK. 9 CNVST Convert Start. Forcing CNVST high prepares the part for a conversion. Conversion begins on the falling edge of CNVST. The sampling instant is defined by the falling edge of CNVST. 10 SCLK Serial Clock Input. Clocks data out of the serial interface. SCLK also sets the conversion speed. 12 AIN+ Positive Analog Input — EP Exposed Paddle. EP is internally connected to GND. Detailed Description The MAX1277/MAX1279 use an input T/H and succes- sive-approximation register (SAR) circuitry to convert an analog input signal to a digital 12-bit output. The serial interface requires only three digital lines (SCLK, CNVST, and DOUT) and provides easy interfacing to microprocessors (µPs) and DSPs. Figure 3 shows the simplified internal structure for the MAX1277/MAX1279. RGND AIN + GND DOUT SCLK CNVST CONTROL LOGIC AND TIMING AIN - VL VDD REF 12-BIT SAR ADC MAX1277 MAX1279 TRACK AND HOLD OUTPUT BUFFER REF 2.048V Figure 3. Functional Diagram CIN+ RIN+ RIN- CIN- VAZ AIN+ AIN- CONTROL LOGIC CAPACITIVE DAC COMP ACQUISITION MODE CIN+ RIN+ RIN- CIN- VAZ AIN+ AIN- CONTROL LOGIC CAPACITIVE DAC COMP HOLD/CONVERSION MODE Figure 4. Equivalent Input Circuit |
Similar Part No. - MAX1277_09 |
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Similar Description - MAX1277_09 |
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