Datasheet

Applications Information
Bypassing REF/V
CC
Place a 0.1μF capacitor between REF or V
CC
and 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 hys-
teresis is needed, an external positive feedback network
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 compara-
tor 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.
Figure 1. Adaptive Signal Level Detector
Table 1. How Devices Behave Under Various Input Voltage Conditions
PART INPUT VOLTAGE CONDITIONS ACTION AT OUTPUT
MAX9060
V
IN
> V
REF
External pullup resistor pulls output high.
V
IN
< V
REF
Output asserts low.
MAX9061
V
IN
> V
REF
Output asserts low.
V
IN
< V
REF
External pullup resistor pulls output high.
MAX9062
V
IN
> 0.2V External pullup resistor pulls output high.
V
IN
< 0.2V Output asserts low.
MAX9063
V
IN
> 0.2V Output asserts low.
V
IN
< 0.2V External pullup resistor pulls output high.
MAX9064
V
IN
> 0.2V Output asserts high.
V
IN
< 0.2V Output asserts low.
MAX9060
DAC
REF
IN
MICROCONTROLLER
INTERNAL
PULLUP
V
DD
I/OOUT
MAX9060–MAX9064 Ultra-Small, Low-Power Single
Comparators in 4-Bump UCSP and 5 SOT23
www.maximintegrated.com
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