ISD5008-SI Просмотр технического описания (PDF) - Unspecified

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производитель

ISD5008-SI

SINGLE-CHIP, VOICE RECORD / PLAYBACK DEVICE 4-, 5-, 6- AND 8-SECOND DURATION

Unspecified 

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

CCOUP = 0.1 F Ra = 10 k

0.1 F

10 k

1.5 k

MIC

1

f NOTE: CUTOFF= 2 RaCCOUP

ISD

3

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