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MAX4040ESA+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
MAX4040–MAX4044
Single/Dual/Quad, Low-Cost, SOT23,
Micropower, Rail-to-Rail I/O Op Amps
_______________________________________________________________________________________ 7
____________________________________Typical Operating Characteristics (continued)
(V
CC
= +5.0V, V
EE
= 0, V
CM
= V
CC
/ 2, SHDN = V
CC
, R
L
= 100kΩ to V
CC
/ 2, T
A
= +25°C, unless otherwise noted.)
1
0.01
1 100010010
TOTAL HARMONIC DISTORTION PLUS NOISE
vs. FREQUENCY
0.1
MAX4040/44-19
FREQUENCY (Hz)
THD + NOISE (%)
R
L
= 10kΩ
R
L
= 100kΩ
1000
10
0 250 500 1000
LOAD RESISTOR vs.
CAPACITIVE LOAD
MAX4040/44-20
C
LOAD
(pF)
R
LOAD
(kΩ)
750
100
10%
OVERSHOOT
REGION OF
MARGINAL STABILITY
REGION OF
STABLE OPERATION
10
µs/div
SMALL-SIGNAL TRANSIENT RESPONSE
(NONINVERTING)
MAX4040/44-21
50mV/div
100mV
100mV
IN
OUT
0V
0V
10µs/div
SMALL-SIGNAL TRANSIENT RESPONSE
(INVERTING)
MAX4040/44-22
50mV/div
100mV
100mV
IN
OUT
0V
0V
100µs/div
LARGE-SIGNAL TRANSIENT RESPONSE
(NONINVERTING)
MAX4040/42/44-23
2V/div
4.5V
0.5V
4.5V
IN
0.5V
OUT
100µs/div
LARGE-SIGNAL TRANSIENT RESPONSE
(INVERTING)
MAX4040/42/44-24
2V/div
+2V
-2V
-2V
+2V
IN
OUT
-60
-110
10 1k 10k
100
MAX4042/MAX4043/MAX4044
CROSSTALK vs. FREQUENCY
-100
MAX4040/44-18
FREQUENCY (Hz)
GAIN (dB)
-90
-80
-70
R
L
= 10kΩ
MAX4040–MAX4044
Single/Dual/Quad, Low-Cost, SOT23,
Micropower, Rail-to-Rail I/O Op Amps
8 _______________________________________________________________________________________
_______________Detailed Description
Rail-to-Rail Input Stage
The MAX4040–MAX4044 have rail-to-rail inputs and
rail-to-rail output stages that are specifically designed
for low-voltage, single-supply operation. The input
stage consists of separate NPN and PNP differential
stages, which operate together to provide a common-
mode range extending to both supply rails. The
crossover region of these two pairs occurs halfway
between V
CC
and V
EE
. The input offset voltage is typi-
cally 200µV. Low operating supply voltage, low supply
current, rail-to-rail common-mode input range, and rail-
to-rail outputs make this family of operational amplifiers
an excellent choice for precision or general-purpose,
low-voltage battery-powered systems.
Since the input stage consists of NPN and PNP pairs,
the input bias current changes polarity as the common-
mode voltage passes through the crossover region.
Match the effective impedance seen by each input to
reduce the offset error caused by input bias currents
flowing through external source impedances (Figures
1a and 1b). The combination of high source impedance
plus input capacitance (amplifier input capacitance
plus stray capacitance) creates a parasitic pole that
produces an underdamped signal response. Reducing
input capacitance or placing a small capacitor across
the feedback resistor improves response in this case.
______________________________________________________________Pin Description
1 —— — —
2 44 4 11
Negative Supply. Tie to ground for
single-supply operation.
V
EE
3 —
Amplifier Output. High impedance
when in shutdown mode.
OUT
— — —
4 —— — — Inverting InputIN-
Noninverting InputIN+
5 108 14 4
— ——
5, 7,
8, 10
—
No Connection. Not internally con-
nected.
N.C.
— —
Positive SupplyV
CC
— — —
— 1, 91, 7 1, 13 1, 7
Outputs for Amplifiers A and B. High
impedance when in shutdown mode.
OUTA,
OUTB
Shutdown Input. Drive high, or tie to
V
CC
for normal operation. Drive to V
EE
to place device in shutdown mode.
SHDN
— 2, 82, 6 2, 12 2, 6
— 3, 73, 5 3, 11 3, 5
Noninverting Inputs to Amplifiers A
and B
INA+,
INB+
— 5, 6
Inverting Inputs to Amplifiers A and B
INA-,
INB-
— 6, 9 —
— —— — 8, 14 Outputs for Amplifiers C and D
OUTC,
OUTD
Shutdown Inputs for Amplifiers A
and B. Drive high, or tie to V
CC
for
normal operation. Drive to V
EE
to
place device in shutdown mode.
SHDNA,
SHDNB
— —— — 9, 13
— —— — 10, 12
Noninverting Inputs to Amplifiers C
and D
INC+,
IND+
Inverting Inputs to Amplifiers C and D
INC-,
IND-
6
4
3
2
7
1, 5
8
—
—
—
—
—
—
—
6
4
3
2
7
1, 5, 8
—
—
—
—
—
—
—
—
MAX4043
MAX4044
PIN
µMAX
MAX4042
SO
MAX4041
FUNCTIONNAME
SOT23-5
MAX4040
SO/µMAX
MAX4040–MAX4044
Single/Dual/Quad, Low-Cost, SOT23,
Micropower, Rail-to-Rail I/O Op Amps
_______________________________________________________________________________________ 9
The MAX4040–MAX4044 family’s inputs are protected
from large differential input voltages by internal 2.2kΩ
series resistors and back-to-back triple-diode stacks
across the inputs (Figure 2). For differential input volt-
ages (much less than 1.8V), input resistance is typically
45MΩ. For differential input voltages greater than 1.8V,
input resistance is around 4.4kΩ, and the input bias
current can be approximated by the following equation:
I
BIAS
= (V
DIFF
- 1.8V) / 4.4kΩ
In the region where the differential input voltage
approaches 1.8V, the input resistance decreases expo-
nentially from 45MΩ to 4.4kΩ as the diode block begins
conducting. Conversely, the bias current increases with
the same curve.
Rail-to-Rail Output Stage
The MAX4040–MAX4044 output stage can drive up to a
25kΩ load and still swing to within 60mV of the rails.
Figure 3 shows the output voltage swing of a MAX4040
configured as a unity-gain buffer, powered from a single
+4.0V supply voltage. The output for this setup typically
swings from (V
EE
+ 10mV) to (V
CC
- 10mV) with a 100kΩ
load.
Applications Information
Power-Supply Considerations
The MAX4040–MAX4044 operate from a single +2.4V to
+5.5V supply (or dual ±1.2V to ±2.75V supplies) and
consume only 10µA of supply current per amplifier. A
high power-supply rejection ratio of 85dB allows the
amplifiers to be powered directly off a decaying battery
voltage, simplifying design and extending battery life.
Power-Up Settling Time
The MAX4040–MAX4044 typically require 200µs to
power up after V
CC
is stable. During this start-up time,
the output is indeterminant. The application circuit
should allow for this initial delay.
R3
R3 = R1 R2
R1 R2
MAX4040–
MAX4044
V
IN
Figure 1b. Minimizing Offset Error Due to Input Bias Current
(Inverting)
2.2kΩ
2.2kΩ
IN-
IN+
Figure 2. Input Protection Circuit
R3
V
IN
R3 = R1 R2
R1 R2
MAX4040–
MAX4044
Figure 1a. Minimizing Offset Error Due to Input Bias Current
(Noninverting)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

MAX4040ESA+T

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Buy MAX4040ESA+T
Manufacturer:
Maxim Integrated
Description:
Operational Amplifiers - Op Amps uPower Rail-Rail
Lifecycle:
New from this manufacturer.
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