MAX9015(2003) 데이터 시트보기 (PDF) - Maxim Integrated

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MAX9015
(Rev.:2003)

SOT23, Dual, Precision, 1.8V, Nanopower Comparators With/Without Reference

Maxim Integrated 

SOT23, Dual, Precision, 1.8V, Nanopower

Comparators With/Without Reference

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

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 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)

Alkaline (2 cells)

No

3.0

Nickel-cadmium

(2 cells)

Yes

2.4

Nickel-metal-hydride

Yes

2.4

(2 cells)

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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