MAX971 Maxim, MAX971 Datasheet - Page 10

• Manufacturer Part Number: MAX971
• Description: The MAX971–MAX974 and MAX981–MAX984 single/dual/quad low-voltage comparators feature the lowest power consumption available
• Manufacturer: Maxim

Ultra-Low-Power, Open-Drain,
Single/Dual-Supply Comparators
Figure 2. Threshold Hysteresis Band
The guaranteed minimum operating voltage is 2.5V (or
±1.25V). As the total supply voltage falls below 2.5V,
performance degrades and the supply current falls. The
reference will not function below about 2.2V, although
the comparators will continue to operate with a total
supply voltage as low as 1V. While the MAX9_4 has
comparators that may be used at supply voltages below
2V, the MAX9_1/MAX9_2/MAX9_3 may not be used with
supply voltages below 2.5V.
At low supply voltages, the comparators’ output sink
capability is reduced and the propagation delay
increases (see Typical Operating Characteristics). The
useful input voltage range extends from the negative
supply to a little under 1V below the positive supply,
which is slightly closer to the positive rail than when the
device operates from higher supply voltages. Test your
prototype over the full temperature and supply-voltage
range if you anticipate operation below 2.5V.
With 100mV of overdrive, propagation delay is typically
3µs. The Typical Operating Characteristics show the
propagation delay for various overdrive levels. The
open-drain outputs are intended for wire-ORed and
level-shifting applications. The maximum output voltage
is 11V above V-, and may be applied even when no
supply voltage is present (V+ = V-).
The MAX9_1 and MAX9_4 outputs sink current to GND,
making these devices ideal for bipolar to single-ended
conversion and level-shifting applications.
10
V
REF
OUT
IN+
IN-
- V
______________________________________________________________________________________
HYST
Low-Voltage Operation: V+ = 1V
V
HB
THRESHOLDS
HYSTERESIS
BAND
Comparator Output
(MAX9_4 Only)
The negative supply does not affect the output sink
current. The positive supply provides gate drive for the
output N-channel MOSFET and heavily influences the
output current capability, especially at low supply
voltages (see Typical Operating Characteristics section).
The MAX9_2 and MAX9_3 have no GND pin, and their
outputs sink current to V-.
The internal bandgap voltage reference has an output
of 1.182V above V-. Note that the REF voltage is
referenced to V-, not to GND. Its accuracy is ±1%
(MAX971/MAX973/MAX974) or ±2% (MAX981–MAX984)
in the 0°C to +70°C range. The REF output is typically
capable of sourcing 25µA and sinking 15µA. Do not
bypass the REF output.
Although the comparators have a very high gain, useful
gain is limited by noise. This is shown in the Transfer
Function graph (see Typical Operating Characteristics).
As the input voltage approaches the comparator’s
offset, the output begins to bounce back and forth; this
peaks when V
graph averages out the bouncing, making the transfer
function easy to observe.) Consequently, the
comparator has an effective wideband peak-to-peak
noise of around 300µV. The voltage reference has
peak-to-peak noise approaching 1mV. Thus, when a
comparator is used with the reference, the combined
peak-to-peak noise is about 1mV. This, of course, is
much higher than the RMS noise of the individual
components. Take care in your layout to avoid
capacitive coupling from any output to the reference
pin. Crosstalk can significantly increase the actual
noise of the reference.
Figure 3. Programming the HYST Pin
IN
R2
R1
= V
I
REF
OS
. (The lowpass filter shown on the
6
5
REF
HYST
2
V-
Noise Considerations
2.5V TO 11V
MAX9_1
MAX9_3
MAX982
7
Voltage Reference
V+