外文翻译--ISD25120录放音芯片介绍-精品.docVIP

The introduce of sound playback chip ISD25120 1 ISD 2500 series chip Profile ????? ISDs 2500 series chips, according to recording time 60 seconds, 75 seconds, 90 seconds and 120 seconds into ISD2560, 2575,2590 and 25120 four models. ISD device with OVF (overflow) client for cascading multiple devices. ????? ISD2500 series EEPROM with capacity for 480K, up to sub-paragraph 600. Four different types of recording time depends on different input sampling rate to achieve, and they were: 8.0,6.4,5.3,4.0 kHz. ????? DIP package 28-pin devices, the pin function as follows: ????? 1 ~ 7 A0/M0 ~ A6/M6 address / mode selection ????? 8 ~ 10 A7 ~ A9 enter an address line ????? 11 AUX IN input ????? 12,13 VSSD, VSSA and analog to digital ????? 14,15 SP +, SP-speaker output ????? 16 VCCA power analog signal positive ????? 17,18 MIC, MIC REF ????? Microphone input and the input reference terminal ????? 19 AGC AGC ????? 20,21 ANA IN, ANA OUT ????? Analog signal input and output ????? Spillage 22 OUF ????? 23 CE chip select (low to allow the chip work) ????? 24 PD-chip low-power state control ????? 25 EOM an end audio playback signal output ????? 26 XCLK external clock ????? 27 P / R recorded / release control to choose ????? 28 VCCD cathode power supply digital signal 2 Working Principle ????? 2500 Series 10 input address A0 ~ A9, the site recorded up to 1024, address space is 0 ~ 1023. Its distribution is: Address 0 ~ 299 as a sub, and did not address the use of 600 ~ 767, 768 ~ 1023 for the address mode selection (ie, A8, A9 are high). Address Line 2500 series has two purposes, first as a mode of control, the second sub-recording sound as the start segment address. When the highest address bit (MSB) A8, A9 are high (ie address 768 ~ 1023), the address A0 ~ A6-side as a working model on the choice of client M0 ~ M6, corresponding to seven kinds of work. When the A8, A9 or any one for the low low (that is, address 0 ~ 599), as long as recorded in the sub / playb