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MAX4198EUA

P1-P3P4-P6P7-P9P10-P12
MAX4198/MAX4199
Rail-to-Rail Output Stage
The MAX4198/MAX4199 output stage incorporates a
common-source rail-to-rail structure which maximizes the
dynamic range of the differential amplifier. The output
can swing to within 100mV from each rail with a 5kΩ load
to V
CC
/ 2 (see the Typical Operating Characteristics).
Shutdown Mode
The MAX4198/MAX4199 have an active-low shutdown
input. SHDN input logic thresholds are referenced to
V
CC
, not to GND. Pulling SHDN 2.5V below the positive
rail places the amplifiers in a 12µA (max) shutdown
mode. The MAX4198/MAX4199 exit or enter shutdown
in 35µs. In shutdown, the OUT pin is high-impedance.
Applications Information
Driving Capacitive Loads
The MAX4198/MAX4199 are relatively immune to oscilla-
tions caused when driving large capacitive loads.
Although heavy load capacitance increases transient ring-
ing, sustained oscillations typically do not occur for loads
under 600pF (see Pulse Response with Capacitive Load
in the Typical Operating Characteristics). Applications that
require driving higher capacitive loads can isolate the out-
put capacitance using a 15Ω to 100Ω resistor between the
amplifier output and the load (Figure 1). Although adding
an isolation resistor dampens the response enough to pre-
vent oscillations, it does so at the expense of bandwidth
and DC accuracy.
Power Supply Considerations
The MAX4198/MAX4199 operate from single +2.7V to
+7.5V supplies or from dual ±1.35V to ±3.75V supplies,
and they consume only 45µA of supply current.
Excellent power-supply rejection permits the amplifiers
to be operated directly from a decaying 3V cell without
excessive error. To maximize AC performance, the sup-
ply must be bypassed with a 0.1µF ceramic capacitor
to ground that must be as close as possible to the pin.
If dual supplies are used, bypass both supply pins with
0.1µF to ground.
Application Circuits
Differential amplifiers can be used in single-ended and
other amplifier applications. Figures 2 through 6 show
the MAX4198/MAX4199 in different configurations. The
internally trimmed and matched resistors offer conven-
ience and have a distinct advantage over external
resistors. These amplifiers are not compensated for sin-
gle-ended unity gain; therefore, IN- should not be con-
nected to OUT or left unconnected.
Micropower, Single-Supply, Rail-to-Rail
Precision Differential Amplifiers
10 ______________________________________________________________________________________
MAX4198
MAX4199
R
ISO
FB
OUT
V
EE
V
CC
INPUT
IN+
IN-
REF
C
L
R
L
OUTPUT
Figure 1. Dual-Supply, Capacitive-Load Driving Circuit
MAX4198
MAX4199
FB
OUT
V
EE
V
CC
IN+
IN-
V
A
V
B
REF
V
OUT
V
OUT
= (V
B
- V
A
)
(MAX4198)
V
OUT
= 10 (V
B
- V
A
)
(MAX4199)
Figure 2. Standard Difference Amplifier
MAX4198
MAX4199
FB
OUT
V
EE
V
CC
IN+
IN-
V
A
REF
V
OUT
V
OUT
= -V
A
(MAX4198)
V
OUT
= -10V
A
(MAX4199)
Figure 3. Precision Inverting Buffer
Instrumentation Amplifier Applications
For applications that require a complete low-power
instrumentation amplifier, refer to the MAX4194–
MAX4197 data sheet. Some differential to single-ended
voltage amplifier applications that do not require a high
input impedance can use the MAX4198/MAX4199 for
gains of +1V/V or +10V/V. The MAX4198/MAX4199 can
also be used as an instrumentation amplifier building
block. The circuit of Figure 7 takes advantage of the
10pA (max), 0.1pA (typ) bias current of the MAX406A
to form an instrumentation amplifier similar to the
MAX4194 family, except with lower input bias currents.
The MAX406A's low 1.2µA supply current maintains a
low overall supply current.
MAX4198/MAX4199
Micropower, Single-Supply, Rail-to-Rail
Precision Differential Amplifiers
______________________________________________________________________________________ 11
MAX4198
5
FB
6
OUT
V
EE
V
CC
1
3
IN+
V
A
REF
2
IN-
V
OUT
V
OUT
= 2V
A
Figure 4. Precision Gain of Two Amplifiers
MAX4198
FB
IN+
V
CC
OUT
IN-
V
A
V
CC
REF
V
OUT
V
OUT
= -V
A
Figure 5. Single-Supply Inverting Amplifier Biased at V
CC
/ 2
MAX4198
5
2
IN-
3
IN+
5
COM
1
REF
1
4
NC
6
NO
IN
FB
6
OUT
V
EE
LOGIC
IN
V
OUT
0
1
-V
A
+V
A
NOTE: MAX4544 PINOUT FOR 6-PIN SOT23-6
V
CC
V
A
V
OUT
MAX4544
Figure 6. Digitally Controlled Precision Gain of ±1 Amplifier
MAX4198
FB
IN-
V
A
IN+
OUT
REF
A1, A2 = MAX406A
V
OUT
= (1 + 2R
2
/ R
1
) (V
B
- V
A
)
V
OUT
V
B
A2
A1
R
2
R
1
R
2
Figure 7. Ultra-Low Input Bias Current (0.1pA) Instrumentation
Amplifiers with 47µA Supply-Current Consumption
MAX4198/MAX4199
Micropower, Single-Supply, Rail-to-Rail
Precision Differential Amplifiers
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
Chip Information
TRANSISTOR COUNT: 250
SUBSTRATE CONNECTED TO V
EE
8LUMAXD.EPS
PACKAGE OUTLINE, 8L uMAX/uSOP
1
1
21-0036
J
REV.DOCUMENT CONTROL NO.APPROVAL
PROPRIETARY INFORMATION
TITLE:
MAX
0.043
0.006
0.014
0.120
0.120
0.198
0.026
0.007
0.037
0.0207 BSC
0.0256 BSC
A2
A1
c
e
b
A
L
FRONT VIEW
SIDE VIEW
E H
0.6±0.1
0.6±0.1
ÿ 0.50±0.1
1
TOP VIEW
D
8
A2
0.030
BOTTOM VIEW
1
6∞
S
b
L
H
E
D
e
c
0∞
0.010
0.116
0.116
0.188
0.016
0.005
8
4X S
INCHES
-
A1
A
MIN
0.002
0.950.75
0.5250 BSC
0.25 0.36
2.95 3.05
2.95 3.05
4.78
0.41
0.65 BSC
5.03
0.66
6∞0∞
0.13 0.18
MAX
MIN
MILLIMETERS
- 1.10
0.05 0.15
α
α
DIM
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages
.)
P1-P3P4-P6P7-P9P10-P12

MAX4198EUA

Mfr. #:
Buy MAX4198EUA
Manufacturer:
Maxim Integrated
Description:
Differential Amplifiers uPower Single-Supply Rail-Rail Precision
Lifecycle:
New from this manufacturer.
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