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MAX148ACPP+ Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX148ACPP+ Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 23 page +2.7V to +5.25V, Low-Power, 8-Channel, Serial 10-Bit ADCs 7 Pin Description Figure 1. Load Circuits for Enable Time Figure 2. Load Circuits for Disable Time PIN NAME FUNCTION 1–8 CH0–CH7 Sampling Analog Inputs 9 COM Ground Reference for Analog Inputs. COM sets zero-code voltage in single-ended mode. Must be stable to ±0.5 LSB. 10 SHDN Three-Level Shutdown Input. Pulling SHDN low shuts the MAX148/MAX149 down; otherwise, they are fully operational. Pulling SHDN high puts the reference-buffer amplifier in internal compensation mode. Leaving SHDN unconnected puts the reference-buffer amplifier in external compensation mode. 11 VREF Reference-Buffer Output/ADC Reference Input. Reference voltage for analog-to-digital conversion. In internal reference mode (MAX149 only), the reference buffer provides a 2.500V nominal output, externally adjustable at REFADJ. In external reference mode, disable the internal buffer by pulling REFADJ to VDD. 12 REFADJ Input to the Reference-Buffer Amplifier. To disable the reference-buffer amplifier, tie REFADJ to VDD. 13 AGND Analog Ground 14 DGND Digital Ground 15 DOUT Serial-Data Output. Data is clocked out at SCLK’s falling edge. High impedance when CS is high. 16 SSTRB Serial-Strobe Output. In internal clock mode, SSTRB goes low when the MAX148/MAX149 begin the A/D conversion, and goes high when the conversion is finished. In external clock mode, SSTRB pulses high for one clock period before the MSB decision. High impedance when CS is high (external clock mode). 17 DIN Serial-Data Input. Data is clocked in at SCLK’s rising edge. 18 CS Active-Low Chip Select. Data will not be clocked into DIN unless CS is low. When CS is high, DOUT is high impedance. 19 SCLK Serial-Clock Input. Clocks data in and out of serial interface. In external clock mode, SCLK also sets the conversion speed (duty cycle must be 40% to 60%). 20 VDD Positive Supply Voltage a) HIGH-Z TO VOH AND VOL TO VOH b) HIGH-Z TO VOL AND VOH TO VOL DOUT DGND 6kI VDD DGND DOUT 6kI CLOAD 50pF CLOAD 50pF b) VOL TO HIGH-Z a) VOH TO HIGH-Z DOUT DGND 6kI CLOAD 50pF VDD DOUT DGND 6kI CLOAD 50pF |
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