isd5008 Winbond Electronics Corp America, isd5008 Datasheet - Page 7

• Manufacturer Part Number: isd5008
• Description: Single-chip, Voice Record / Playback Device 4-, 5-, 6- And 8-second Duration
• Manufacturer: Winbond Electronics Corp America

Table 2:
Table 3:
ISD
FLD1
0
0
1
1
(Minutes)
Duration
4
5
6
8
FLD0
0
1
0
1
External Clock Input Table
Internal Clock Rate/Filter Edge
220 F
Electret
Microphone
WM-54B
Panasonic
Sample Rate
Sample Rate
(kHz)
(kHz)
8.0
6.4
5.3
4.0
6.4
5.3
8
4
VCC
Filter Pass Band
Required Clock
1.5 k
1.5 k
1.5 k
819.2
682.7
1024
(kHz)
(kHz)
Figure 1: Microphone Input
512
3.4
2.7
2.3
1.7
C
COUP
0.1 F
NOTE:
= 0.1 F
MIC+
MIC
f
CUTOFF
2.2
MIC+, MIC –
The microphone input transfers the voice signal to
the on-chip AGC preamplifier or directly to the
ANA OUT MUX, depending on the selected path.
The direct path to the ANA OUT MUX has a gain of
6 dB so a 208 mVp-p signal across the differential
microphone inputs would give 416 mVp-p across
the ANA OUT pins. The AGC circuit has a range of
45 dB in order to deliver a nominal 694 mVp-p into
the storage array from a typical electret micro-
phone output of 2 to 20 mVp-p. The input imped-
ance is typically 10 kΩ.
R
a
10 k
= 10 k
=
ANALOG I/O PINS
2 R
Internal to the device
a
C
1
COUP
(Microphone Input+/–)
ISD5008 Product
3