Low-Cost, Micropower, SC70/SOT23-8, Microphone

Preamplifiers with Complete Shutdown

9

Figure 3. Bias Network Circuit

MICROPHONE

INPUT

3.5mm SOCKET

MAX4468

MIC_BIAS

GND

200k

Ω

47pF

100k

Ω

100k

Ω

1k

Ω

2.2k

Ω

20k

Ω

0.1

µF

0.01

µF

10

µF

VCC

IN+

IN-

OUT

SHDN

Test Circuits/Timing Diagrams (continued)

40

µs/div

50mV/div

CL = 2000pF

Figure 4. Small-Signal Transient Response with Excessive

Capacitive Load

400

µs/div

SHDN

2V/div

OUT

RL = 10kΩ

CL = 10pF

Figure 5. MAX4467/MAX4468 Shutdown Waveform