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PCA1070

Features: ` Line interface with: Voltage regulator with programmable DC voltage drop Programmable set impedance Output to control an external switching MOS transistor for pulse dialling Programmable DC voltage during pulse dialling Circuitry for short DC settling time` Interface to peripheral circ...

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SeekIC No. : 004456209 Detail

PCA1070: Features: ` Line interface with: Voltage regulator with programmable DC voltage drop Programmable set impedance Output to control an external switching MOS transistor for pulse dialling Programmable...

PCA1070 Data Sheet

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Part Number:
PCA1070
Supply Ability:
5000

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  • 1~5000
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  • Processing time
  • 15 Days
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Product Details

Description



Features:

` Line interface with:
Voltage regulator with programmable DC voltage drop
Programmable set impedance
Output to control an external switching MOS transistor for pulse dialling
Programmable DC voltage during pulse dialling
Circuitry for short DC settling time
` Interface to peripheral circuits with:
Supply for microcontroller and DTMF diallers
Input to sense supply voltage of microcontroller and output for reset of microcontroller
I2C-bus (programming of parameters, control of all logic signals)
High impedance DTMF signal input
Input for external oscillator signal with on-chip DC blocking
Power-down via the I2C-bus
Stabilized supply for electret microphone
` Microphone and DTMF amplifiers:
Low-noise microphone preamplifier suitable for various types of microphones
Symmetrical high impedance microphone preamplifier inputs
Programmable gain for microphone and DTMF channels
Sending mute via the I2C-bus to disable microphone amplifier and enable DTMF amplifier
Sending mute also to be used as privacy switch
Dynamic limiting (speech controlled) to prevent distortion of line signal and sidetone; programmable maximum sending level
` Receiving amplifier:
Suitable for various types of earpieces (including
piezo)
Programmable gain and hearing protection level
Receiving mute via the I2C-bus to disable receiving amplifier and enable DTMF confidence tone
On-chip anti-sidetone circuit with programmable sidetone balance
Confidence tone in the earpiece during DTMF dialling
` Facility to regulate parameters with line current:
Value of DC line current (bit code) readable via the I2C-bus
Line loss compensation with fully software programmable characteristics (control range, stop current) of microphone/earpiece/DTMF amplifiers
Fully software programmable control of sidetone balance and DC voltage drop as a function of line length.
APPLICATIONS
` Wired telephony (basic till feature phones)
` Combi-terminals (e.g. telephone and answering machine or FAX)
` Modems and base units of cordless telephones.



Pinout

Connection Diagram


Description

The PCA1070 is a CMOS integrated circuit performing all speech and line interface functions in fully electronic telephone sets. The device requires a minimum of external components. The transmission parameters are programmable via the I2C-bus. PCA1070 makes the IC PCA1070 adaptable to nearly all worldwide country requirements and to a various range of speech transducers, without changing the (few) external components.

The parameters of PCA1070 are stored in the EEPROM of a microcontroller and are loaded into the PCA1070 during the start-up phase of the transmission IC after hook-off. The PCA1070 also allows adaptation to the connected telephone line by reading the line current via the I2C-bus and processing it in the microcontroller.




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