ISD1700A Datasheet, PDF (19/31 Pages) Winbond – Multi-Message Single-Chip Voice Record&Playback Devices

ISD1700A SERIES
7.4 ANALOG INPUTS
7.4.1 Microphone Input
MIC +
MIC -
Ccoup
0.1uF
Ra = 7K
Ccoup
0.1uF
Ra = 7K
INTERNAL TO THE DEVICE
AGC
MIC IN
Fcutoff=1/(2*pi*Ra*Ccoup)
Figure 7.2: MIC input impedance (When this path is active)
7.4.2 AnaIn Input
INTERNAL TO THE DEVICE
ANAIN
Ccoup
0.1uF
Ra = 42K
Ra = 42K
ANAIN INPUT AMPLIFIER
Fcutoff=1/(2*pi*Ra*Ccoup)
Figure 7.3: AnaIn input impedance (When the device is powered-up)
Confidential
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Publication Release Date: March 28, 2005
Revision A0