Ultra-Small, Low-Power Single

Comparators in 4-Bump UCSP and 5 SOT23

8

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Applications Information

GND as close as possible to the device. During a

switching event, all comparators draw a current spike

from their power-supply rails. This current spike is

minimized by the use of an internal break-before-make

design.

Hysteresis Operation

The MAX9060–MAX9064 feature internal hysteresis for

noise immunity and glitch-free operation. If additional

hysteresis is needed, an external positive feedback net-

work can be easily implemented on the MAX9060,

MAX9062, and MAX9064 noninverting input devices.

Additional external hysteresis is not recommended for

the MAX9061 due to possible crossover current-related

noise problems. Additional external hysteresis is not

possible on the MAX9063 because the noninverting

input of the comparator is not externally accessible.

Adaptive Signal Level Detector

The MAX9060 and MAX9061 can be used as an adap-

tive signal-level detector. Feed a DAC output voltage

to REF and connect the input to a variable signal level.

As the DAC output voltage is varied from 0.9V to 5.5V,

a corresponding signal level threshold-detector circuit

is implemented. See Figure 1.

PART

INPUT VOLTAGE CONDITIONS

ACTION AT OUTPUT

External pullup resistor pulls output high.

MAX9060

Output asserts low.

Output asserts low.

MAX9061

External pullup resistor pulls output high.

External pullup resistor pulls output high.

MAX9062

Output asserts low.

Output asserts low.

MAX9063

External pullup resistor pulls output high.

Output asserts high.

MAX9064

Output asserts low.

Figure 1. Adaptive Signal Level Detector

MAX9060

DAC

REF

IN

MICROCONTROLLER

INTERNAL

PULLUP

I/O

OUT

Table 1. How Devices Behave Under Various Input Voltage Conditions