MAX951 Ver la hoja de datos (PDF) - Maxim Integrated
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MAX951 Datasheet PDF : 13 Pages
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MAX951–MAX954
Ultra-Low-Power, Single-Supply
Op Amp + Comparator + Reference
Pin Description
PIN
MAX951 MAX953
MAX952 MAX954
1
1
2
2
3
3
4
4
5
5
6
—
—
6
7
7
8
8
NAME
FUNCTION
AMPOUT
AMPIN-
AMPIN+
VSS
COMPIN+
REF
COMPIN-
COMPOUT
VDD
Op Amp Output
Inverting Op Amp Input
Noninverting Op Amp Input
Negative Supply or Ground
Noninverting Comparator Input
1.200V Reference Output. Also connected to inverting comparator input.
Inverting Comparator Input
Comparator Output
Positive Supply
Functional Diagrams
AMPOUT
1
OP AMP
2 AMPIN-
3 AMPIN+
4 VSS
1.20V
MAX951
MAX952
VDD 8
COMPOUT 7
x1
COMP
REF 6
COMPIN+ 5
AMPOUT
1
OP AMP
2 AMPIN-
3 AMPIN+
4
VSS
MAX953
MAX954
VDD 8
COMPOUT 7
COMP
COMPIN- 6
COMPIN+ 5
Figure 1. MAX951–MAX954 Functional Diagrams
Detailed Description
The MAX951–MAX954 are combinations of a micropower
op amp, comparator, and reference in an 8-pin pack-
age, as shown in Figure 1. In the MAX951/MAX952, the
comparator’s negative input is connected to a 1.20V ±2%
bandgap reference. All four devices are optimized to oper-
ate from a single supply. Supply current is less than 10μA
(7μA typical) for the MAX951/MAX952 and less than 8μA
(5μA typical) for the MAX953/MAX954.
Op Amp
The op amps in the MAX951/MAX953 are internally com-
pensated to be unity-gain stable, while the op amps in the
MAX952/MAX954 feature 125kHz typical gain bandwidth,
66V/ms slew rate, and stability for gains of 10V/V or great-
er. All these op amps feature high-impedance differential
inputs and a common-mode input voltage range that
extends from the negative supply rail to within 1.6V of the
positive rail. They have a CMOS output stage that swings
rail to rail and is driven by a proprietary high gain stage,
which enables them to operate with an ultra-low supply
current while maintaining linearity under loaded condi-
tions. Careful design results in good DC characteristics
over their entire operating temperature range, minimizing
input referred errors.
Comparator
The comparator in the MAX951–MAX954 has a high-
impedance differential input stage with a common-mode
input voltage range that extends from the negative supply
rail to within 1.6V of the positive rail. Their CMOS output
stage swings rail-to-rail and can continuously source as
much as 40mA. The comparators eliminate power-supply
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