MAX4194 데이터 시트보기 (PDF) - Maxim Integrated

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MAX4194

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

Maxim Integrated 

Micropower, Single-Supply, Rail-to-Rail,

Precision Instrumentation Amplifiers

MAX4196

OUT

AC-COUPLED

(VDIFF = 200mV,

G = +10V/V)

(500mV/div)

50µs/div

Figure 5b. MAX4196 Shutdown Mode

SHDN

(5V/div)

VCC

IN+

RISO

IN-

VOUT

VEE

RG = ∞

(MAX4194)

(INTERNAL, MAX4195)

RL

CL

VREF

VREF

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

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

MAX4197

OUT

AC-COUPLED

(VDIFF = 20mV,

G = +100V/V)

(500mV/div)

INPUT

(50mV/div)

SHDN

(5V/div)

50µs/div

Figure 5c. MAX4197 Shutdown Mode

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.

OUTPUT

(50mV/div)

50µs/div

Figure 6b. Small-Signal Pulse Response with Excessive

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

INPUT

(50mV/div)

50µs/div

OUTPUT

(50mV/div)

Figure 6c. Small-Signal Pulse Response with Excessive

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

25kΩ, CL = 1000pF)

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