ISD2532X datasheet(9/42 Pages) WINBOND

Part #	ISD2532X

Description	SINGLE-CHIP, MULTIPLE-MESSAGES, VOICE RECORD/PLAYBACK DEVICE 32-, 40-, 48-, AND 64-SECOND DURATION

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Manufacturer	WINBOND [Winbond]

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ISD2532/40/48/64

PIN NO.

PIN NAME

SOIC/

PDIP

TSOP

FUNCTION

XCLK

26

5

External Clock: The external clock input has an internal pull-down

device. The device is configured at the factory with an internal

sampling clock frequency centered to

±1 percent of specification.

The frequency is then maintained to a variation of

±2.25 percent

over the entire commercial temperature and operating voltage

ranges. If greater precision is required, the device can be clocked

through the XCLK pin as follows:

Part Number

Sample Rate

Required Clock

ISD2532

8.0 kHz

1024 kHz

ISD2540

6.4 kHz

819.2 kHz

ISD2548

5.3 kHz

682.7 kHz

ISD2564

4.0 kHz

512 kHz

These recommended clock rates should not be varied because the

antialiasing and smoothing filters are fixed, and aliasing problems

can occur if the sample rate differs from the one recommended.

The duty cycle on the input clock is not critical, as the clock is

immediately divided by two. If the XCLK is not used, this input

must be connected to ground.

P/ R

27

6

Playback/Record: The P/ R input pin is latched by the falling edge

of the CE pin. A HIGH level selects a playback cycle while a LOW

level selects a record cycle. For a record cycle, the address pins

provide the starting address and recording continues until PD or

CE

is pulled HIGH or an overflow is detected (i.e. the chip is full).

When a record cycle is terminated by pulling PD or CE HIGH,

then End-Of-Message ( EOM ) marker is stored at the current

address in memory. For a playback cycle, the address inputs

provide the starting address and the device will play until an EOM

marker is encountered. The device can continue to pass an EOM

marker if CE is held LOW in address mode, or in an Operational

Mode. (See Operational Modes section)

Publication Release Date: June 2003

- 9 -

Revision 1.0

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