isd1740a Winbond Electronics Corp America, isd1740a Datasheet - Page 19

• Manufacturer Part Number: isd1740a
• Description: Multi-message Single-chip Voice Record&playback Devices
• Manufacturer: Winbond Electronics Corp America

Confidential
7.4 A
7.4.1
7.4.2
NALOG
Microphone Input
AnaIn Input
I
NPUTS
Figure 7.2: MIC input impedance (When this path is active)
Figure 7.3: AnaIn input impedance (When the device is powered-up)
MIC +
ANAIN
MIC -
Ccoup
Ccoup
0.1uF
0.1uF
Ccoup
0.1uF
INTERNAL TO THE DEVICE
R
R
a
a
R
a
= 7K
= 7K
= 42K
- 19 -
AGC
INTERNAL TO THE DEVICE
R
a
= 42K
Fcutoff=1/(2*pi*Ra*Ccoup)
Publication Release Date: March 28, 2005
MIC IN
Fcutoff=1/(2*pi*Ra*Ccoup)
ANAIN INPUT AMPLIFIER
ISD1700A SERIES
Revision A0