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ISD5008 Datasheet(PDF) 6 Page - List of Unclassifed Manufacturers

Part No. ISD5008
Description  SINGLE CHIP VOICE RECORD PLAYBACK DEVICE 4-, 5-, 6-, AND 8- MINUTE DURATIONS
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Maker  ETC [List of Unclassifed Manufacturers]
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ISD5008 Product
3
ISD
Table 3:
Internal Clock Rate/Filter Edge
2.2
ANALOG I/O PINS
MIC+, MIC –
(Microphone Input+/–)
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 k
Ω.
Figure 1:
Microphone Input
Table 2:
External Clock Input Table
Duration
(Minutes)
Sample Rate
(kHz)
Required Clock
(kHz)
4
8.0
1024
5
6.4
819.2
6
5.3
682.7
84.0
512
FLD1
FLD0
Sample Rate
(kHz)
Filter Pass Band
(kHz)
00
8
3.4
01
6.4
2.7
10
5.3
2.3
11
4
1.7
Ra = 10 k
10 k
CCOUP = 0.1 F
0.1 F
Internal to the device
Electret
Microphone
WM-54B
Panasonic
1.5 k
1.5 k
1.5 k
220 F
VCC
MIC+
MIC
NOTE:
fCUTOFF=
1
2 RaCCOUP




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