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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)： | 15/44頁 |
| 文件大?。?/td> | 180K |
| 代理商： | UAA3515AHL |
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2001 Dec 12
15
Philips Semiconductors
Product specification
900 MHz analog cordless telephone IC
UAA3515A
handbook, halfpage
Vo(EARO)
(dBV)
40
30
20
0
Vi(RXAI) (dBV)
0
40
60
20
FCA168
10
y = 2
× +
20
Fig.7 Expander characteristic.
RX gain adjusted to 0 dB.
No external resistor.
VCTL = 00.
EXP
out
=
7 dB at THD < 4%.
7.6
TX baseband
This section covers the TX audio path from pins MICI to
TXO (see Fig.8). The input signal at pin MICI is
AC-coupled. There is another AC-coupling at the
microphone amplifier output.
The microphone amplifier is an inverting operational
amplifier whose gain can be set by external resistors. The
non-inverting input is connected to the internal reference
voltage VB. External resistors are used to set the gain and
frequency response.
The TX baseband has a compressor with the
characteristic shown in Fig.9. The ALC provides a ‘soft’
limit to the output signal swing as the input voltage
increases slowly (i.e. a sine wave is maintained at the
output). A hard limiter clamps the compressor output
voltage at 1.26 V (peak-to-peak). The ALC and the hard
limiter can be disabled via the microcontroller interface.
The hard limiter is followed by a mute circuit. The TX gain
is digitally programmable in 32 steps of 0.5 dB.
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