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MAX1065CEUI Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX1065CEUI Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 14 page 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 MAX1065/MAX1066 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 14-bit accuracy, allow 10ms (CREFADJ = 0.1µF, CREF = 1µF) for the internal reference to wake up. Increase wakeup time propor- tionally when using larger values of CREFADJ and CREF. Internal and External Reference Internal Reference The internal reference of the MAX1065/MAX1066 is internally buffered to provide 4.096V (typ) output at REF. Bypass REF to AGND and REFADJ to AGND with 1µF and 0.1µF respectively. Fine adjustments can be made to the internal reference voltage by sinking or sourcing current at REFADJ. The input impedance at REFADJ is nominally 5kΩ. The internal reference volt- age 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 MAX1065/ MAX1066’s internal buffer amplifier. When connecting an external reference to REFADJ, the input impedance is typically 5kΩ. Using the buffered REFADJ input makes buffering the external reference unnecessary; however, the internal buffer output must be bypassed at REF with a 1µF capacitor. Connect REFADJ to AVDD to disable the internal buffer. Directly drive REF using an external reference. During conversion, the external reference must be able to drive 100µA of DC load current and have an output impedance of 10Ω or less. REFADJ’s impedance is typ- ically 5kΩ. The DC input impedance of REF is 40kΩ minimum. For optimal performance, buffer the reference through an op amp and bypass REF with a 1µF capacitor. Consider the MAX1065/MAX1066’s equivalent input noise (80µVRMS) when choosing a reference. Low-Power, 14-Bit Analog-to-Digital Converters with Parallel Interface 10 ______________________________________________________________________________________ AUTO-ZERO RAIL CAPACITIVE DAC CDAC = 32pF REF AGND TRACK HOLD HOLD TRACK ZERO RIN 800 Ω AIN CSWITCH 3pF Figure 4. Equivalent Input Circuit CS R/C EOC REF AND BUFFER REF POWER- DOWN BIT ACQUISITION CONVERSION DATA OUT Figure 5. Selecting Standby Mode CS EOC REF AND BUFFER REF POWER- DOWN BIT ACQUISITION CONVERSION DATA OUT R/C Figure 6. Selecting Shutdown Mode |
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