器件名称:
ST5088
功能描述:
PROGRAMMABLE AUDIO FRONT END FOR DIGITAL PHONES AND ISDN TERMINALS
文件大小:
275.14KB 共33页
简 介:
ST5088 PROGRAMMABLE AUDIO FRONT END FOR DIGITAL PHONES AND ISDN TERMINALS FEATURES: Complete CODEC and FILTER system including: PCM ANALOG TO DIGITAL AND DIGITAL TO ANALOG CONVERTERS POWERFUL ANALOG FRONT END CAPABLE TO INTERFACE DIRECTLY: - Microphone Dynamic or Electrete - Earpiece down to 100 or up to 150nF - Loudspeaker down to 50 or Buzzer up to 600nF. TRANSMIT BAND-PASS FILTER ACTIVE RC NOISE FILTER RECEIVE LOW-PASS FILTER WITH SIN X/X CORRECTION MU-LAW OR A-LAW SELECTABLE COMPANDING CODER AND DECODER PRECISION VOLTAGE REFERENCE Phones Features: DUAL SWITCHABLE MICROPHONE AMPLIFIER INPUTS. GAIN PROGRAMMABLE: 15 dB RANGE, 1 dB STEP. LOUDSPEAKER AMPLIFIER OUTPUT. SWITCHABLE MAXIMUM GAIN: +9dB/+27dB WITH AUTOMATIC DIGITAL ANTICLIPPING SYSTEM. aTTENUATION PROGRAMMABLE: 30dB RANGE, 2dB STEP. SEPARATE EARPIECE AMPLIFIER OUTPUT. ATTENUATION PROGRAMMABLE: 15 dB RANGE, 1 dB STEP. AUXILIARY TAPE RECORDER ANALOG INTERFACE: Tx + Rx COMBINED OUTPUT. AUXILIARY SWITCHABLE EXTERNAL RING INPUT (EAIN). TRANSIENT SUPRESSION SIGNAL DURING POWER ON. INTERNAL PROGRAMMABLE SIDETONE CIRCUIT. ATTENUATION PROGRAMMABLE: 15 dB RANGE, 1 dB STEP, INDEPENDENT FROM Rx CONTROL. INTERNAL RING OR TONE GENERATOR INCLUDING DTMF TONES, SINEWAVE OR SQUAREWAVE WAVEFORMS. ATTENUATION PROGRAMMABLE: 27 dB RANGE, 3 dB STEP. RINGER CONTROL PROGRAMMABLE INDecember 1999 SO28 PLCC28 ORDERING NUMBERS: ST5088D ST5088FN TERNALLY (P) OR EXTERNALLY (pin AT) COMPATIBLE WITH HANDS-FREE CIRCUIT TEA7540. ON CHIP SWITCH……
