ISD5008 Datasheet, PDF (6/47 Pages) List of Unclassifed Manufacturers – SINGLE CHIP VOICE RECORD PLAYBACK DEVICE 4-, 5-, 6-, AND 8- MINUTE DURATIONS

Table 2: External Clock Input Table
Duration
(Minutes)
Sample Rate
(kHz)
Required Clock
(kHz)
4
8.0
5
6.4
6
5.3
8
4.0
1024
819.2
682.7
512
Table 3: Internal Clock Rate/Filter Edge
Sample Rate Filter Pass Band
FLD1 FLD0
(kHz)
(kHz)
0
0
8
3.4
0
1
6.4
2.7
1
0
5.3
2.3
1
1
4
1.7
ISD5008 Product
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 kΩ.
Figure 1: Microphone Input
VCC
1.5 k
220 F
Electret
Microphone
WM-54B
Panasonic
1.5 k
MIC+
Internal to the device
C_COUP = 0.1 F _{Ra = 10 k}
0.1 F
10 k
1.5 k
MIC
1
f NOTE: CUTOFF= _{2 RaCCOUP}
ISD
3