MAX9016A 查看數據表（PDF） - Maxim Integrated
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MAX9016A Datasheet PDF : 17 Pages
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MAX9015–MAX9020
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
hysteresis 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
minimizes supply-current surges while switching, which
virtually 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 protec-
tion 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).
SOT23, Dual, Precision, 1.8V,
nanoPower Comparators
With/Without Reference
Output Stage Circuitry
The devices 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 this device 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 characteristic reduces
the need for power-supply filter capacitors 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 reference
is a very-low-power bandgap cell, with a typical 35kΩ
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 current op amp
such as the MAX4162. Most applications require no
REF bypass capacitor. For noisy environments 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)
Alkaline (2 cells)
No
3.0
Nickel-cadmium
(2 cells)
Yes
2.4
Nickel-metal-hydride
(2 cells)
Yes
2.4
Lithium-ion (1 cell)
Yes
3.6
VEND-OF-
LIFE (V)
CAPACITY,
AA SIZE
(mA-hr)
MAX9015A/
MAX9016A
OPERATING
TIME (hr)
1.8
2000
2000k
MAX9017/
MAX9018
OPERATING
TIME (hr)
1540k
MAX9019/
MAX9020
OPERATING
TIME (hr)
1333k
1.8
750
750k
570k
500k
1.8
1000
1000k
2.9
1000
1000k
770k
770k
660k
660k
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