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MAX4198

Micropower, Single-Supply, Rail-to-Rail Precision Differential Amplifiers

Maxim Integrated 

Micropower, Single-Supply, Rail-to-Rail

Precision Differential Amplifiers

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.

IN- 2

IN+

VA

3

REF 1

VCC

VEE

MAX4198

5 FB

6

OUT

VOUT

VOUT = 2VA

VA IN-

VCC

IN+

REF

VCC

MAX4198

FB

OUT

VOUT

VOUT = -VA

Figure 4. Precision Gain of Two Amplifiers

Figure 5. Single-Supply Inverting Amplifier Biased at VCC / 2

VA

2

IN-

FB 5

VCC

6

NO

MAX4544

5

3

COM IN+

4

NC

1

REF

IN 1

6

VOUT

OUT

VEE

MAX4198

NOTE: MAX4544 PINOUT FOR 6-PIN SOT23-6

LOGIC

IN

0

1

VOUT

-VA

+VA

VA

A1

IN-

R2

R1

R2

IN+

A2

VB

A1, A2 = MAX406A

FB

MAX4198

OUT

VOUT

REF

VOUT = (1 + 2R2 / R1) (VB - VA)

Figure 6. Digitally Controlled Precision Gain of ±1 Amplifier

Figure 7. Ultra-Low Input Bias Current (0.1pA) Instrumentation

Amplifiers with 47µA Supply-Current Consumption

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