UAA2062 Просмотр технического описания (PDF) - Philips Electronics

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UAA2062

Analog cordless telephone IC

Philips Electronics 

Philips Semiconductors

Analog cordless telephone IC

Product specification

UAA2062

The RX baseband

This section covers the RX audio path from pins RXI to

EARO. The RXI input signal is AC-coupled.

The microcontroller sets the value of the RX gain by

32 linear steps of 0.5 dB. The RX baseband has a mute

and an expander with the characteristics shown in Fig.7.

EARPIECE AMPLIFIER

The earpiece amplifier is an inverting rail-to-rail

operational amplifier. The non-inverting input is connected

to the internal reference voltage VB. Internal resistors are

used to set the gain at 6 dB. An external resistor

(connected between pins EARI and EARO) can be used

to reduce the gain.

handbook, full pagewidth

RXI

30

ECAP

1

RX gain

RX mute

expander

EARI

26

earpiece amplifier

EARO

27

internal resistor : 28 kΩ

external resistor

FCA124

Fig.6 RX baseband schematic diagram.

handbook, full pagewidth

EARO

(dBV)

0

−10

−20

−30

FCA127

EARO = −7 dBV typical at THD = 5%

−20

− 40

− 40

−50

−60

− 40

−30

−20

−10

(1) ∆GARX = 0 dB, GEAR = 0 dB (external resistor of 28 kΩ).

Fig.7 Expander characteristic.

0

RXI (dBV)

2000 Aug 10

10

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