MAX4197 Maxim, MAX4197 Datasheet - Page 11

• Manufacturer Part Number: MAX4197
• Description: The MAX4194 is a variable-gain precision instrumentation amplifier that combines Rail-to-Rail; single-supply operation, outstanding precision specifications, and a high gain bandwidth
• Manufacturer: Maxim

The accuracy and temperature drift of the R
also influence the IC’s precision and gain drift, and can
be derived from the equation above. With low R
ues, which are required for high-gain operation, para-
sitic resistances may significantly increase the gain
error.
The MAX4194–MAX4197 are stable for capacitive loads
up to 300pF (Figure 6a). Applications that require
greater capacitive-load driving capability can use an
isolation resistor (Figure 6b) between the output and
the capacitive load to reduce ringing on the output sig-
nal. However, this alternative reduces gain accuracy
because R
the load resistor.
Figure 5b. MAX4196 Shutdown Mode
Figure 5c. MAX4197 Shutdown Mode
ISO
(Figure 6c) forms a potential divider with
______________________________________________________________________________________
Micropower, Single-Supply, Rail-to-Rail,
50µs/div
50µs/div
Capacitive-Load Stability
Precision Instrumentation Amplifiers
MAX4196
OUT
AC-COUPLED
(V
(500mV/div)
SHDN
(5V/div)
MAX4197
OUT
AC-COUPLED
(V
(500mV/div)
SHDN
(5V/div)
G = +10V/V)
G = +100V/V)
DIFF
DIFF
= 200mV,
= 20mV,
G
resistors
G
val-
Figure 6a. Using a Resistor to Isolate a Capacitive Load from
the Instrumentation Amplifier (G = +1V/V)
Figure 6b. Small-Signal Pulse Response with Excessive
Capacitive Load (R
Figure 6c. Small-Signal Pulse Response with Excessive
Capacitive Load and Isolating Resistor (R
25kΩ, C
R
G
= ∞
L
IN+
IN-
= 1000pF)
(MAX4194)
(INTERNAL, MAX4195)
V
V
EE
CC
L
= 25kΩ, C
R
50µs/div
ISO
50µs/div
L
V
= 1000pF)
REF
R
L
V
ISO
REF
C
= 75Ω, R
L
INPUT
(50mV/div)
OUTPUT
(50mV/div)
INPUT
(50mV/div)
OUTPUT
(50mV/div)
V
OUT
L
=
11