- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄98205 > TDA9887TS/V3 (NXP SEMICONDUCTORS) AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO24 PDF資料下載
參數(shù)資料
| 型號(hào)： | TDA9887TS/V3 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 接收器 |
| 英文描述： | AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO24 |
| 封裝： | 5.30 MM, PLASTIC, MO-150, SOT-340-1, SSOP-24 |
| 文件頁數(shù)： | 4/56頁 |
| 文件大?。?/td> | 230K |
| 代理商： | TDA9887TS/V3 |
第1頁第2頁第3頁當(dāng)前第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁
2002 Mar 05
12
Philips Semiconductors
Product specication
I2C-bus controlled multistandard alignment-free
IF-PLL demodulator with FM radio
TDA9887TS
8.14
Audio amplier and mute time constant
The audio amplifier consists of two parts:
AF preamplifier
AF output amplifier.
The AF preamplifier used for FM sound is an operational
amplifier with internal feedback, high gain and high
common mode rejection. The AF voltage from the
PLL demodulator is 5 mV (RMS) for frequency deviation of
27 kHz and is amplified by 30 dB. By the use of a
DC operating point control circuit (with external
capacitor CAF), the AF preamplifier is decoupled from the
PLL DC voltage. The low-pass characteristic of the
amplifier reduces the harmonics of the sound intercarrier
signal at the AF output terminal.
For FM sound a switchable de-emphasis network (with
external capacitor) is implemented between the
preamplifier and the output amplifier.
The AF output amplifier provides the required AF output
level by a rail-to-rail output stage. A preceding stage
makes use of an input selector for switching between
FM sound, AM sound and mute state. The gain can be
switched between 10 dB (normal) and 4 dB (reduced).
Switching to the mute state is controlled automatically,
dependent on the digital acquisition help for the case the
VCO of the FM-PLL is not in the required frequency
window. This is done by a time constant: fast for switching
to the mute state and slow (typically 40 ms) for switching
to the no-mute state.
All switching functions are controlled via the I2C-bus:
AM sound, FM sound and forced mute
Auto mute enable or disable
De-emphasis off or on with 50 or 75 s
Audio gain normal or reduced.
8.15
Radio mode
The principle is to multiply the first radio IF (e.g. 33.3 MHz
at tuner output) with 44 MHz reference signal. The result
of the down-conversion is the second radio IF (10.7 MHz)
at intercarrier output.
In the radio mode the tuner delivers a first radio IF signal
of 33.3 MHz. This signal is fed via the SIF SAW filter
(conventional used for QSS TV sound processing) to the
SIF input. The sound IF amplifier supplies this radio
IF signal by means of gain control with constant level to the
QSS mixer. The single reference QSS mixer generates the
second radio IF signal of 10.7 MHz. In the radio mode the
VIF VCO operates as part of a frequency synthesizer and
delivers a constant 44 MHz signal (derived from the
reference signal of 4 MHz) for the down-conversion of the
first radio IF to 10.7 MHz. This signal is fed via the external
ceramic band-pass filter to the FM demodulator. The
demodulated AF signal is amplified by the audio amplifier.
In case of NTSC application (M/N standard) the internal
mixing frequency is 52 MHz. So, the first radio IF has to be
41.3 MHz.
For tuning search mode, the device offers certain
monitoring functions. Switchable are radio AFC, FM-AGC
or SIF-AGC to pin AFC.
8.16
Internal voltage stabilizer
The band gap circuit internally generates a voltage of
approximately 2.4 V, independent of supply voltage and
temperature. A voltage regulator circuit, connected to this
voltage, produces a constant voltage of 3.55 V which is
used as an internal reference voltage.
8.17
I2C-bus transceiver and module address
The device can be controlled via the 2-wire I2C-bus by a
microcontroller. Two wires carry serial data (SDA) and
serial clock (SCL) information between the devices
connected to the I2C-bus.
The device has an I2C-bus slave transceiver with
auto-increment. The circuit operates up to clock
frequencies of 400 kHz.
A slave address is sent from the master to the slave
receiver. To avoid conflicts in a real application with other
devices providing similar or complementing functions,
there are four possible slave addresses available. These
Module Addresses (MADs) can be selected by connecting
resistors on pin SIOMAD and/or pins SIF1 and SIF2 (see
Fig.23). Pin SIOMAD relates with bit A0 and pins SIF1
and SIF2 relate with bit A3. The slave addresses of this
device are given in Table 1.
The power-on preset value is dependent on the use of
pin SIOMAD and can be chosen for 45.75 MHz NTSC as
default (pin SIOMAD left open-circuit) or 58.75 MHz NTSC
(resistor on pin SIOMAD). In this way the device can be
used without the I2C-bus as an NTSC only device.
Remark: In case of using the device without the I2C-bus,
then the rise time of the supply voltage after switching on
power must be longer than 1.2
s.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TDA9889TS/V1,512 | SPECIALTY CONSUMER CIRCUIT, PDSO16 |
| TDA9889TS/V1,518 | SPECIALTY CONSUMER CIRCUIT, PDSO16 |
| TDA9898HL/V3 | SPECIALTY CONSUMER CIRCUIT, PQFP48 |
| TDA9898HN/V3 | SPECIALTY CONSUMER CIRCUIT, PQCC48 |
| TDA9897HL/V3 | SPECIALTY CONSUMER CIRCUIT, PQFP48 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TDA9888 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:DVB selective AGC amplifier |
| TDA9888TS | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:DVB selective AGC amplifier |
| TDA9889 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:DVB selective AGC amplifier |
| TDA9889TS | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:DVB selective AGC amplifier |
| TDA9889TS/V1,512 | 功能描述:射頻放大器 DVB T AFRIC DOWN CONVERSION RoHS:否 制造商:Skyworks Solutions, Inc. 類型:Low Noise Amplifier 工作頻率:2.3 GHz to 2.8 GHz P1dB:18.5 dBm 輸出截獲點(diǎn):37.5 dBm 功率增益類型:32 dB 噪聲系數(shù):0.85 dB 工作電源電壓:5 V 電源電流:125 mA 測試頻率:2.6 GHz 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 封裝:Reel |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。