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參數(shù)資料
| 型號： | UAA3515AHL |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | 900 MHz analog cordless telephone IC |
| 中文描述： | TELECOM, CORDLESS, RF AND BASEBAND CIRCUIT, PQFP64 |
| 封裝： | 10 X 10 X 1.40 MM, PLASTIC, LQFP-64 |
| 文件頁數(shù)： | 14/44頁 |
| 文件大?。?/td> | 180K |
| 代理商： | UAA3515AHL |
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2001 Dec 12
14
Philips Semiconductors
Product specification
900 MHz analog cordless telephone IC
UAA3515A
7.5
Receiver baseband
This section covers the RX audio path from pins RXAI to
EARO (see Fig.6). The RXAI input signal is AC-coupled.
The microcontroller sets the value of the RX gain in
32 linear steps of 0.5 dB. The RX baseband has a mute
function and an expander with characteristics as shown in
Fig.7.
For audio level adjustment and, potentially for software
volume control, setting the RX gain provides a dynamic
range of 31 dB. This is achieved by the expander slope
that multiplies the RX gain by a factor of two for each gain
step thus giving 1 dB steps measured at the earpiece
amplifier output.
The earpiece amplifier is a rail-to-rail inverting operational
amplifier. The non-inverting input is connected to the
internal reference voltage at pin VB. Software volume
control on the earpiece amplifier is achieved by using an
integrated switched feedback resistor R
int
. The volume
control tuning range is 14 dB. Hardware volume control is
achieved by switching externally the earpiece feedback
resistor R
ext
.
handbook, full pagewidth
FCA298
EARPIECE
AMPLIFIER
44VCC(ARX)
43 EARI
46 RXAI
45 ECAP
42 EARO
Rext
Cext
VB
EXPANDERRX MUTE
RX GAIN
UAA3515A
Rint
Fig.6 RX baseband block diagram.
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