MAX4198 Maxim, MAX4198 Datasheet - Page 11

• Manufacturer Part Number: MAX4198
• Description: The MAX4198/MAX4199 low-power, rail-to-rail differential amplifiers are ideal for single-supply applications that benefit from a low 0
• Manufacturer: Maxim

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
Figure 4. Precision Gain of Two Amplifiers
Figure 6. Digitally Controlled Precision Gain of ±1 Amplifier
V
V
A
A
NOTE: MAX4544 PINOUT FOR 6-PIN SOT23-6
REF
NO
NC
IN-
IN+
6
4
Instrumentation Amplifier Applications
2
3
1
MAX4544
IN
1
5
COM
______________________________________________________________________________________
REF
IN+
IN-
2
3
1
Micropower, Single-Supply, Rail-to-Rail
V
CC
MAX4198
V
EE
MAX4198
LOGIC
IN
0
1
V
Precision Differential Amplifiers
CC
5
6
V
+V
-V
V
OUT
EE
A
A
V
OUT
FB
FB
6
OUT
OUT
= 2V
5
A
V
V
OUT
OUT
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.
Figure 5. Single-Supply Inverting Amplifier Biased at V
Figure 7. Ultra-Low Input Bias Current (0.1pA) Instrumentation
Amplifiers with 47µA Supply-Current Consumption
V
V
V
A
B
A
A1, A2 = MAX406A
R
IN-
1
A1
A2
R
R
2
2
V
CC
IN+
REF
IN+
IN-
MAX4198
V
MAX4198
CC
V
OUT
= (1 + 2R
FB
OUT
2
V
/ R
OUT
FB
OUT
REF
1
) (V
= -V
B
CC
A
- V
A
/ 2
V
)
OUT
V
OUT
11