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MAX9016A Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX9016A Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 17 page MAX9015–MAX9020 SOT23, Dual, Precision, 1.8V, Nanopower Comparators With/Without Reference 11 Maxim Integrated Detailed Description The MAX9015–MAX9018 feature an on-board 1.24V ±0.5% (±1.45% for the B grade) reference, yet draw an ultra-low supply current. The MAX9019/MAX9020 (duals without reference) consume just 850nA of supply current. All devices are guaranteed to operate down to 1.8V supply. Their common-mode input voltage range extends 200mV beyond-the-rails. An internal 4mV hys- teresis ensures clean output switching, even with slow- moving input signals. Large internal output drivers swing rail-to-rail with up to ±6mA loads (MAX9015/ MAX9017/MAX9019). The output stage employs a unique design that mini- mizes supply-current surges while switching, which vir- tually eliminates the supply glitches typical of many other comparators. The MAX9015/MAX9017/MAX9019 have a push-pull output stage that sinks as well as sources current. The MAX9016/MAX9018/MAX9020 have an open-drain output stage that can be pulled beyond VCC up to 5.5V above VEE. These open-drain versions are ideal for implementing wire-ORed output logic functions. Input Stage Circuitry The input common-mode voltage ranges extend from VEE - 0.2V to VCC + 0.2V. These comparators operate at any differential input voltage within these limits. Input bias current is typically ±150pA at the trip point, if the input voltage is between the supply rails. Comparator inputs are protected from overvoltage by internal ESD protection diodes connected to the supply rails. As the input voltage exceeds the supply rails, these ESD pro- tection diodes become forward biased and begin to conduct increasing input bias current (see the Input Bias Current vs. Input Bias Voltage graph in the Typical Operating Characteristics). Output Stage Circuitry The MAX9015–MAX9020 feature a unique break- before-make output stage capable of driving ±8mA loads rail-to-rail. Many comparators consume orders of magnitude more current during switching than during steady-state operation. However, with the MAX9015– MAX9020 family of comparators, the supply-current change during an output transition is extremely small. In the Typical Operating Characteristics, the Supply Current vs. Output Transition Frequency graphs show the minimal supply-current increase as the output switching frequency approaches 1kHz. This character- istic reduces the need for power-supply filter capaci- tors to reduce glitches created by comparator switching currents. In battery-powered applications, this characteristic results in a substantial increase in battery life. Reference (MAX9015–MAX9018) The MAX9015–MAX9018s’ internal +1.24V reference has a typical temperature coefficient of 40ppm/°C over the full -40°C to +85°C temperature range. The refer- ence is a very-low-power bandgap cell, with a typical 35k Ω output impedance. REF can source and sink up to 100nA to external circuitry. For applications needing increased drive, buffer REF with a low input-bias cur- rent op amp such as the MAX4162. Most applications require no REF bypass capacitor. For noisy environ- ments or fast transients, connect a 1nF to 10nF ceramic capacitor from REF to GND. Applications Information Low-Voltage, Low-Power Operation The MAX9015–MAX9020 are ideally suited for use with most battery-powered systems. Table 1 lists a variety of battery types, capacities, and approximate operating times for the MAX9015–MAX9020, assuming nominal conditions. Table 1. Battery Applications Using the MAX9015–MAX9020 BATTERY TYPE RECHARGEABLE VFRESH (V) VEND-OF- LIFE (V) CAPACITY, AA SIZE (mA-hr) MAX9015A/ MAX9016A OPERATING TIME (hr) MAX9017/ MAX9018 OPERATING TIME (hr) MAX9019/ MAX9020 OPERATING TIME (hr) Alkaline (2 cells) No 3.0 1.8 2000 2000k 1540k 1333k Nickel-cadmium (2 cells) Yes 2.4 1.8 750 750k 570k 500k Nickel-metal-hydride (2 cells) Yes 2.4 1.8 1000 1000k 770k 660k Lithium-ion (1 cell) Yes 3.6 2.9 1000 1000k 770k 660k |
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