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MAX149AMJP Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX149AMJP Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 24 page +2.7V to +5.25V, Low-Power, 8-Channel, Serial 10-Bit ADCs _______________________________________________________________________________________ 7 ______________________________________________________________Pin Description VDD 6k DGND DOUT CLOAD 50pF CLOAD 50pF DGND 6k DOUT a) High-Z to VOH and VOL to VOH b) High-Z to VOL and VOH to VOL VDD 6k DGND DOUT CLOAD 50pF CLOAD 50pF DGND 6k DOUT a) VOH to High-Z b) VOL to High-Z Figure 1. Load Circuits for Enable Time Figure 2. Load Circuits for Disable Time Input to the Reference-Buffer Amplifier. To disable the reference-buffer amplifier, tie REFADJ to VDD. REFADJ 12 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). SSTRB 16 Serial-Data Input. Data is clocked in at SCLK’s rising edge. DIN 17 Active-Low Chip Select. Data will not be clocked into DIN unless CS is low. When CS is high, DOUT is high impedance. CS 18 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%.) SCLK 19 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. VREF 11 Analog Ground AGND 13 Digital Ground DGND 14 Serial-Data Output. Data is clocked out at SCLK’s falling edge. High impedance when CS is high. DOUT 15 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. Letting SHDN float puts the reference-buffer amplifier in external compensation mode. SHDN 10 Ground reference for analog inputs. COM sets zero-code voltage in single-ended mode. Must be stable to ±0.5LSB. COM 9 PIN Sampling Analog Inputs CH0–CH7 1–8 FUNCTION NAME Positive Supply Voltage VDD 20 |
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