Features: Complete CODECand FILTER system including:
` PCM ANALOG TO DIGITAL AND DIGITAL TO ANALOGCONVERTERS
` POWERFUL ANALOG FRONT END CAPABLE TO INTERFACE DIRECTLY:
- Microphone Dynamic, Piezo or Electrete
- Earpiece down to 100W or up to 150nF
- Loudspeakerdown to 50W 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 AUXILIARY
OUTPUT. ATTENUATION PROGRAMMABLE:
30 dB RANGE, 2 dB STEP.
` SEPARATE EARPIECE AMPLIFIER OUTPUT.
ATTENUATION PROGRAMMABLE: 15 dB RANGE, 1 dB STEP
` AUXILIARY SWITCHABLE EXTERNAL RING INPUT (EAIN).
` TRANSIENT SUPRESSION SIGNAL DURING POWER ON.
` INTERNAL PROGRAMMABLE SIDETONE
CIRCUIT. ATTENUATION PROGRAMMABLE:
15 dB RANGE, 1 dB STEP.
` INTERNAL RING OR TONE GENERATOR INCLUDING DTMF TONES, SINEWAVE OR SQUAREWAVE WAVEFORMS.
ATTENUATION PROGRAMMABLE: 27 dB RANGE, 3 dB STEP.
` COMPATIBLE WITH HANDS-FREE CIRCUIT TEA7540.
` ON CHIP SWITCHABLE ANTI-ACOUSTIC FEED-BACK CIRCUIT (ANTI-LARSEN).
General Features:
` EXTENDED TEMPERATURE RANGE OPERATION (*) 40°C TO +85°C.
` EXTENDEDPOWER SUPPLY RANGE 5V±10%.
` 60 mW OPERATINGPOWER (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 MICROWIRE ™ compatible.
GCI interface compatible.
(*) Functionality guaranteed in the range 40°C to +85°C; Timing and Electrical Specifications are guaranteed in the range 25°C to+85°C.Application· ISDN TERMINALS.
· DIGITAL TELEPHONES
· CT2 AND GSMAPPLICATIONSPinout
Specifications
| Parameter |
Value |
Unit |
| VCC to GND |
7 |
V |
| Current at VMIC (VCC 5.5V) |
±50 |
mA |
| Current at VRxO and LS |
±100 |
mA |
| Current at any digital output |
±50 |
mA |
| Voltage at any digital input (VCC5.5V); limited at + 50mA |
VCC + 1 to GND - 1 |
V |
| Storage temperature range |
- 65 to + 150 |
|
| Lead Temperature (wave soldering, 10s) |
+260 |
|
DescriptionST5080A PIAFE is a combined PCM CODEC/FILTER device optimized for ISDN Terminals and Digital Telephone applications. This device is A-law and Mu-law selectable and offers a number of programmable functions accessed through a serial control channel.
Depending on mode selected, ST5080A channel control is provided by means of a separate serial channel control MICROWIRE compatible or multiplexed with the PCM voice data channel in a GCI compatible format requiring only 4 digital interface pins. When separate serial control interface is selected, PCM interface is compatible with Combo I and Combo II families of devices such as ETC5057/54,TS5070/71.
PIAFE is built using SGS-THOMSON's advanced HCMOS process.
Transmit section of PIAFE ST5080A consists of an amplifier with switchable high impedance inputs followed by a programmable gain amplifier, an active RC antialiasing pre-filter to provide attenuationof high frequency noise, an 8th order switched capacitor band pass transmit filter and an A-law/Mu-law selectable compandig encoder.
Receive section consist of an A-law/Mu-law selectable expanding decoder which reconstructs the analog sampled data signal, a 3400 Hz low pass filter with sin X/X correction followed by two separate programmable attenuation blocks and two power amplifiers: One can be used to drive an earpiece, and the other to drive a 50 loudspeaker.
Programmable functions on PIAFE include a Ring/Tone generator which provides one or two tones and can be directed to earpiece or to loudspeaker or alternatively a piezo transducer up to 600nF.
A separate programmable gain amplifier allows gain control of the signal injected. Ring/Tone generator provides sinewave or squarewave signal with precise frequencies which may be also directed to the input of the Transmit amplifier for DTMF tone generation.
An auxiliary analog input (EAIN) is also provided to enable for example the output of an external band limited Ring signal to the Loudspeaker.
Transmit signal may be fed back into the receive ampifier with a programmable attenuation to provide a sidetone circuitry.
A switchable anti-accoustic feed-back system cancels the larsen effect in speech monitoring application.
Two additional pins are provided for insertion of an external Handfree function in the Loudspeaker receive path.
An output latch controlled by register programming permits external device control.
ST5080A Data Sheet
