Product Data Sheets

ISD1000A Series

1–3

1

to achieve longer recording durations. The non-

volatile storage array is based on production-

proven, low-power CMOS EEPROM technology.

The highly integrated ISD1000A Series contains

all the basic functions required for high-quality

voice Recording and Playback. The noise-cancel-

ling Microphone Preamplifier and Automatic Gain

Control (AGC) record both low-volume and high-

volume sounds. The AGC attack and release

times are adjusted by an external resistor and

capacitor. Antialiasing is performed by a continu-

ous fifth-order Chebyshev filter, requiring no exter-

nal components or clocks to give toll-quality

reproduction. The low corner of the passband is

user-settable by two external capacitors. The

devices contain their own temperature-stabilized

timebase oscillator.

The ISD1000A devices drive a speaker directly

through differential outputs. This boosts power by

four times and eliminates the need for a series

capacitor or an output amplifier. The device will

operate from a single power supply or from batter-

ies. The device also includes a power down func-

tion for applications where minimum power

consumption is critical. The CMOS-based design,

combined with the nonvolatile storage array,

assures the lowest possible overall power con-

sumption.

On-chip control functions make the ISD1000A

Series very easy to use in a wide array of applica-

tions. Each device offers a variety of operating

modes and interface options. The devices may be

used in applications that require little more than a

few switches and a battery. The devices may also

be integrated into electronic systems where digital

addresses can be provided for more sophisti-

cated message addressing and control. The

ISD1000A array is organized into 160 segments.

Addresses A0 through A7 provide access to each

segment in the array for message addressing.

Addressing provides the capability of construct-

ing messages by combining stored phrases and

sounds.

PIN DESCRIPTIONS

To minimize noise, the analog and digital circuits

in the ISD1000A Series devices use separate

power busses. These voltage busses are brought

out to separate pins and should be tied together

as close to the supply as possible. In addition,

these supplies should be decoupled as close to

the package as possible.

The ISD1000A Series of devices utilizes separate

analog and digital ground busses.

These pins

should be tied together as close to the package

as possible and connected through a low-imped-

ance path to power supply ground.

Power Down Input (PD)

When not recording or playing back, the PD pin

should be pulled HIGH to place the part in a very

EOM pulses LOW for an overflow condition, PD

should be brought HIGH to reset the address

pointer back to the beginning of the Record/Play-

back space.

SSD

SSA

M0/A0

M1/A1

M2/A2

M3/A3

M4/A4

M5/A5

NC

NC

A6

A7

AUX IN

V

V

SP+

V

P/R

XCLK

EOM

PD

CE

NC

ANA OUT

ANA IN

AGC

MIC REF

MIC

V

SP–

CCD

CCA

DIP/SOIC

1

2

3

4

5

6

7

8

9

10

11

12

13

14

28

27

26

25

24

23

22

21

20

19

18

17

16

15

ISD1000A SERIES PINOUTS

06.DataBook_1000A Dsht Page 3 Friday, September 27, 1996 10:44 AM