The paper

Low low ISD4002 series single 2 to 4 minutes of ISD4003 series single-chip 4 to 8 minutes

Low internal serial communication interface second-ranking ISD4004 series single chip microcontroller 8 to 16 minutes audio playback -- prefix = st1 ns = "urn: schemas - Microsoft - com: office: smarttags" 8/10/12 and 16 minutes

Low 3 v single power supply work low segment information processing

Low working current 25 to 30 ma, to maintain current 1 mu A low power consumption information not save 100 (typical)

Low quality, natural voice reduction technology low 100000 recording cycle (typical)

Low since the movement noise function on chip from adjust clock, can choose external clock prefix = o ns = "urn: schemas - Microsoft - com: office: office"

Type no.

time

Input sampling

Typical bandwidth

The large number

The minimum long

External Zhong Pin

ISD4004-08

Eight minutes

8.0 kHz

3.4 kHz

1200

200 ms

1024.0 kHz

ISD4004-10

Ten minutes

6.4 kHz

2.7 kHz

1200

250 ms

819.2 kHz

ISD4004-12

12 minutes

5.3 kHz

2.3 kHz

1200

300 ms

682.7 kHz

ISD4004-16

16 minutes

4.0 kHz

1.7 kHz

1200

400 ms

512.0 kHz

ISD4002 working voltage 3 v series, monolithic playback time 2 minutes to 4 minutes, good quality, suitable for mobile phones and other portable electronic products. Chip using CMOS technology, containing confused oscillator, filter, denoising smoothing filter, audio amplifier, the activity and high density multilevel flash storage display. Chip design is based on all operations must be controlled by microcontroller, commands through the serial communication interface (SPI or Microwire) into. Chip adopts multilevel direct analog storage technology, each sampling value directly storage in glint on chip memory and therefore able to reproduce the very real, natural voice, music, tone and sound effect, avoids the general solid audio circuit caused by quantization and compression quantization noise and sound "metal". Sampling frequency of 4.0, 4.0, 5.3, 8.0 kHz, the lower the frequency, the longer the playback time, and the sound quality is declined, glint on chip information stored in memory and may be retained in the case of power cuts (typical) in 100, the tape 100000 times over and over again.