uaa2062 NXP Semiconductors, uaa2062 Datasheet - Page 10

• Manufacturer Part Number: uaa2062
• Description: Analog Cordless Telephone Ic
• Manufacturer: NXP Semiconductors

Philips Semiconductors
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.
2000 Aug 10
handbook, full pagewidth
handbook, full pagewidth
Analog cordless telephone IC
(1)
G
ARX
= 0 dB, G
EAR
EARO
(dBV)
RXI
30
= 0 dB (external resistor of 28 k ).
10
20
30
40
50
60
0
40
RX gain
Fig.6 RX baseband schematic diagram.
RX mute
30
40
Fig.7 Expander characteristic.
expander
ECAP
20
1
20
10
E
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.
ARPIECE AMPLIFIER
10
EARO = 7 dBV typical at THD = 5%
EARI
26
internal resistor : 28 k
earpiece amplifier
external resistor
0
RXI (dBV)
EARO
FCA124
27
FCA127
Product specification
UAA2062