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MAX1166AEUP Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX1166AEUP Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 15 page Selecting Standby or Shutdown Mode The MAX1165/MAX1166 have a selectable standby or low-power shutdown mode. In standby mode, the ADC’s internal reference and reference buffer do not power down between conversions, eliminating the need to wait for the reference to power up before performing the next conversion. Shutdown mode powers down the reference and reference buffer after completing a con- version. The reference and reference buffer require a minimum of 10ms (CREFADJ = 0.1µF, CREF = 4.7µF) to power up and settle from shutdown. The state of R/C at the second falling edge of CS selects which power-down mode the MAX1165/ MAX1166 enter upon conversion completion. Holding R/C low causes the MAX1165/MAX1166 to enter stand- by mode. The reference and buffer are left on after the conversion completes. R/C high causes the MAX1165/ MAX1166 to enter shutdown mode and shut down the reference and buffer after conversion (Figures 5 and 6). When using an external reference, set the REF power- down bit high for lowest current operation. Standby Mode While in standby mode, the supply current is reduced to less than 1mA (typ). The next falling edge of CS with R/C low causes the MAX1165/MAX1166 to exit standby mode and begin acquisition. The reference and refer- ence buffer remain active to allow quick turn-on time. Standby mode allows significant power savings while running at the maximum sample rate. Shutdown Mode In shutdown mode, the reference and reference buffer are shut down between conversions. Shutdown mode reduces supply current to 0.5µA (typ) immediately after the conversion. The falling edge of CS with R/C low causes the reference and buffer to wake up and enter acquisition mode. To achieve 16-bit accuracy, allow 10ms (CREFADJ = 0.1µF, CREF = 4.7µF) for the internal reference to wake up. Internal and External Reference Internal Reference The internal reference of the MAX1165/MAX1166 is internally buffered to provide +4.096V output at REF. Bypass REF to AGND and REFADJ to AGND with 4.7µF and 0.1µF, respectively. Fine adjustments can be made to the internal reference voltage by sinking or sourcing current at REFADJ. The input impedance of REFADJ is nominally 5kΩ. The internal reference voltage is adjustable to ±1.5% with the circuit of Figure 7. External Reference An external reference can be placed at either the input (REFADJ) or the output (REF) of the MAX1165/ MAX1166s’ internal buffer amplifier. When connecting an Low-Power, 16-Bit Analog-to-Digital Converter with Parallel Interface 10 ______________________________________________________________________________________ CS REF AND BUFFER REF POWER- DOWN BIT ACQUISITION CONVERSION DATA OUT R/C EOC Figure 5. Selecting Standby Mode REF POWER- DOWN BIT ACQUISITION CONVERSION DATA OUT CS REF AND BUFFER R/C EOC Figure 6. Selecting Shutdown Mode MAX1165 MAX1166 REFADJ +5V 100kΩ 150kΩ 68kΩ 0.1µF Figure 7. MAX1165/MAX1166 Reference Adjust Circuit |
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