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UAA2062

Analog cordless telephone IC

Philips Electronics 

Philips Semiconductors

Analog cordless telephone IC

Product specification

UAA2062

DATA COMPARATOR

The data comparator is an inverting hysteresis

comparator. An external filter is connected between

pins DETO and DATI (AC-coupled). The open-collector

output is current limited to control the output signal slew

rate. The external resistor at pin DATO, connected to VCC,

should be 220 kΩ. An external capacitor in parallel with

this resistor will reduce the slew rate.

The transmit part

The transmitter architecture is of the direct modulation

type. The transmit VCO can be frequency modulated

either by speech or data (see Fig.4).

TRANSMIT VCO

Before the VCO, an amplifier sums the modulating signal

and the data TX signal. The Colpitts type transmit VCO

includes integrated varicaps. Fixed external capacitors are

used to extend the tuning range for all countries.

The internal capacitors are programmed via the serial bus

interface. The power amplifier is capable of driving

50 Ω AC. The output level is also programmed with 2 bits

via the serial bus interface. An internal regulator supplies

the TX VCO.

handbook, full pagewidth

data TX

TXO

6

MODI

MODO

5

4

VBMOD

summing

amplifier

10.24 MHz

TXPD 2

LPF

TXLF 3

DUAL PLL

FREQUENCY

SYNTHESIZER

VCC(AUTX)

VB 15

REG 3 V

10 VREFTX

TX VCO

7 PAO

PA

9 LO3I

FCA122

Fig.4 Transmit schematic diagram.

2000 Aug 10

8

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