PCA1070P datasheet(2/36 Pages) PHILIPS

2 / 36 page

1997 Jun 20

Philips Semiconductors

Product speciﬁcation

Multistandard programmable analog

CMOS transmission IC

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 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.

GENERAL 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. This makes the IC

adaptable to nearly all worldwide country requirements

and to a various range of speech transducers, without

changing the (few) external components.

The parameters 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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