MAX4195ESA datasheet(11/13 Pages) MAXIM

11 / 13 page

MAX4194–MAX4197

Micropower, Single-Supply,

Rail-to-Rail, Precision

Instrumentation Amplifiers

Maxim Integrated | 11

www.maximintegrated.com

The accuracy and temperature drift of the RG resistors

also influence the IC’s precision and gain drift, and can

be derived from the equation above. With low RG val-

ues, which are required for high-gain operation, para-

sitic resistances may significantly increase the gain

error.

Capacitive-Load Stability

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 RISO (Figure 6c) forms a potential divider with

the load resistor.

INPUT

(50mV/div)

OUTPUT

(50mV/div)

μs/div

Figure 6b. Small-Signal Pulse Response with Excessive

Capacitive Load (RL = 25kΩ, CL = 1000pF)

INPUT

(50mV/div)

OUTPUT

(50mV/div)

μs/div

Figure 6c. Small-Signal Pulse Response with Excessive

Capacitive Load and Isolating Resistor (RISO = 75Ω, RL =

25kΩ, CL = 1000pF)

IN-

(MAX4194)

(INTERNAL, MAX4195)

VEE

VREF

VOUT

VCC

RISO

IN+

RG =

∞

Figure 6a. Using a Resistor to Isolate a Capacitive Load from

the Instrumentation Amplifier (G = +1V/V)

SHDN

(5V/div)

MAX4196

OUT

AC-COUPLED

(VDIFF = 200mV,

G = +10V/V)

(500mV/div)

μs/div

SHDN

(5V/div)

MAX4197

OUT

AC-COUPLED

(VDIFF = 20mV,

G = +100V/V)

(500mV/div)

μs/div

Figure 5c. MAX4197 Shutdown Mode

Figure 5b. MAX4196 Shutdown Mode

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