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參數(shù)資料
| 型號： | MAX951 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Ultra-Low-Power, Single-Supply Op Amp + Comparator + Reference(超低功耗、單電源運放+比較器+基準) |
| 中文描述： | 超低功耗、單電源運算放大器 + 比較器 + 電壓基準 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 141K |
| 代理商： | MAX951 |
continuously source as much as 40mA. The compara-
tors eliminate power-supply glitches that commonly
occur when changing logic states, minimizing parasitic
feedback and making them easier to use. In addition,
they include internal hysteresis (±3mV) to ensure clean
output switching, even with slow-moving input signals.
The inputs can be taken above and below the supply
rails up to 300mV without damage. Input voltages
beyond this range can forward bias the ESD-protection
diodes and should be avoided.
The MAX951–MAX954 comparator outputs swing rail to
rail (from V
DD
to V
SS
). TTL compatibility is assured by
using a +5V ±10% supply.
The MAX951–MAX954 comparator continuously outputs
source currents as high as 40mA and sink currents of
over 5mA, while keeping quiescent currents in the
microampere range. The output can source 100mA (at
V
DD
= 5V) for short pulses, as long as the package’s
maximum power dissipation is not exceeded. The out-
put stage does not generate crowbar switching currents
during transitions; this minimizes feedback through the
supplies and helps ensure stability without bypassing.
Referenc e
The internal reference in the MAX951/MAX952 has an
output of 1.20V with respect to V
SS
. Its accuracy is ±2%
in the -40°C to +85°C temperature range. It is comprised
of a trimmed bandgap reference fed by a proportional-
to-absolute-temperature (PTAT) current source and
buffered by a micropower unity-gain amplifier. The REF
output is typically capable of sourcing and sinking 20μA.
Do not bypass the reference output. The reference is
stable for capacitive loads less than 100pF.
__________Applic ations Information
The micropower MAX951–MAX954 are designed to
extend battery life in portable instruments and add
functionality in power-limited industrial controls.
Following are some practical considerations for circuit
design and layout.
Comparator Hysteresis
Hysteresis increases the comparator’s noise immunity
by increasing the upper threshold and decreasing the
lower threshold. The comparator in these devices con-
tain a ±3mV wide internal hysteresis band to ensure
clean output switching, even with slow-moving signals.
When necessary, hysteresis can be increased by using
external resistors to add positive feedback, as shown in
Figure 2. This circuit increases hysteresis at the
expense of more supply current and a slower
response. The design procedure is as follows:
1) Set R2. The leakage current in COMPIN+ is less
than 5nA (up to +85°C), so current through R2 can
be as little as 500nA and still maintain good accura-
cy. If R2 = 2.4M
, the current through R2 at the
upper trip point is V
REF
/ R2 or 500nA.
2) Choose the width of the hysteresis band. In this
example choose V
EHYST
= 50mV.
[
+
(
where the internal hysteresis is V
IHYST
= 3mV.
3) Determine R1. If the supply voltage is 5V, then R1 =
24k
.
4) Check the hysteresis trip points. The upper trip point is
=
(
or 1.22V in our example. The lower trip point is 50mV
less, or 1.17V in our example.
If a resistor divider is used for R1, the calculations
should be modified using a Thevenin equivalent
model.
5) Determine R
A
:
M
Ultra-Low-Power, S ingle-S upply
Op Amp + Comparator + Referenc e
_______________________________________________________________________________________
9
REF
RB
RA
V
S
R2
COMPOUT
REF
R1
V
IN
R2
COMPOUT
Figure 2. External Hysteresis
R1
R2
V
2
V
2
EHYST
IHYST
V
DD
IHYST
V
=
]
)
V
R1 + R2
R2
V
V
I( )
REF
IHYST
)(
)
+
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| MAX952 | Ultra-Low-Power, Single-Supply Op Amp + Comparator + Reference(超低功耗、單電源運放+比較器+基準) |
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| MAX954 | Ultra-Low-Power, Single-Supply Op Amp + Comparator + Reference(超低功耗、單電源運放+比較器+基準) |
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