ST5088 Datasheet, PDF (1/33 Pages) STMicroelectronics – PROGRAMMABLE AUDIO FRONT END FOR DIGITAL PHONES AND ISDN TERMINALS

®
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 CAPA-
BLE TO INTERFACE DIRECTLY:
- Microphone Dynamic or Electrete
- Earpiece down to 100Ω or up to 150nF
- Loudspeaker down to 50Ω 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 COM-
PANDING CODER AND DECODER
PRECISION VOLTAGE REFERENCE
Phones Features:
DUAL SWITCHABLE MICROPHONE AMPLI-
FIER 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 IN-
TERFACE: 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 IN-
CLUDING DTMF TONES, SINEWAVE OR
SQUAREWAVE WAVEFORMS. ATTENU-
ATION PROGRAMMABLE: 27 dB RANGE, 3
dB STEP.
RINGER CONTROL PROGRAMMABLE IN-
SO28
PLCC28
ORDERING NUMBERS:
ST5088D
ST5088FN
TERNALLY (µP) OR EXTERNALLY (pin AT)
COMPATIBLE WITH HANDS-FREE CIRCUIT
TEA7540.
ON CHIP SWITCHABLE ANTI-ACOUSTIC
FEED-BACK CIRCUIT (ANTI-LARSEN).
General Features:
EXTENDED TEMPERATURE RANGE OP-
ERATION (*) – 25°C TO +85°C.
EXTENDED POWER SUPPLY RANGE 5V±10%.
60 mW OPERATING POWER (TYPICAL).
1.0 mW STANDBY POWER (TYPICAL).
CMOS DIGITAL INTERFACES.
SINGLE + 5V SUPPLY.
DIGITAL LOOPBACK TEST MODE.
PROGRAMMABLE DIGITAL AND CONTROL
INTERFACES:
– Digital PCM Interface associated with
separate serial Control Interface MI-
CROWIRE™ compatible.
– GCI interface compatible.
(*) Functionality guaranteed in the range – 25°C to +85°C;
Timing and Electrical Specifications are guaranteed in the range
– 5°C to +70°C.
APPLICATIONS:
ISDN TERMINALS.
DIGITAL TELEPHONES
CT2 AND GSM APPLICATIONS
December 1999
1/33
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.