參數(shù)資料
型號(hào)： TDA9884TS
廠(chǎng)商： NXP SEMICONDUCTORS
元件分類(lèi)： 接收器
英文描述： I2C-bus controlled multistandard alignment-free IF-PLL for mobile reception
中文描述： AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO24
封裝： 5.30 MM, PLASTIC, SOT-340-1, MO-150, SSOP-24
文件頁(yè)數(shù)： 12/55頁(yè)
文件大小： 231K
代理商： TDA9884TS
2003 Nov 28
12
Philips Semiconductors
Product specification
I
2
C-bus controlled multistandard alignment-free
IF-PLL for mobile reception
TDA9884TS
The VCO within the FM-PLL is phase-locked to the
incoming 2nd SIF signal, which is frequency modulated.
As well as this, the VCO control voltage is superimposed
by the AF voltage. Therefore, the VCO tracks with the FM
of the 2nd SIF signal. So, the AF voltage is present at the
loop filter and is typically 5 mV (RMS) for 27 kHz
FM deviation. This AF signal is fed via a buffer to the audio
amplifier.
The correct locking of the PLL is supported by the digital
acquisition help circuit (see Section 7.6).
7.14
Audio amplifier 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 a frequency deviation
of 27 kHz and is amplified by 30 dB. By the use of a
DC operating point control circuit (with external
capacitor C
AF
), 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 in 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 I
2
C-bus:
AM sound, FM sound and forced mute
Auto mute enable or disable
De-emphasis off or on with 50 or 75
μ
s
Audio gain normal or reduced.
7.15
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.
7.16
I
2
C-bus transceiver and module address
The device can be controlled via the 2-wire I
2
C-bus by a
microcontroller. Two wires carry serial data (SDA) and
serial clock (SCL) information between the devices
connected to the I
2
C-bus.
The device has an I
2
C-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.21). 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 SIOMADleftopen-circuit)or58.75 MHzNTSC
(resistor on pin SIOMAD). In this way the device can be
used without the I
2
C-bus as an NTSC only device.
Remark:
In case of using the device without the I
2
C-bus,
then the rise time of the supply voltage after switching on
power must be longer than 1.2
μ
s.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TDA9884TS/V1 功能描述:調(diào)節(jié)器/解調(diào)器 MOBILE VIF AND SIF DEMODULATOR RoHS:否 制造商:Texas Instruments 封裝 / 箱體:PVQFN-N24 封裝:Reel
TDA9884TS/V1,112 功能描述:調(diào)節(jié)器/解調(diào)器 MOBILE VIF AND SIF RoHS:否 制造商:Texas Instruments 封裝 / 箱體:PVQFN-N24 封裝:Reel
TDA9884TS/V1,118 功能描述:調(diào)節(jié)器/解調(diào)器 MOBILE VIF AND SIF RoHS:否 制造商:Texas Instruments 封裝 / 箱體:PVQFN-N24 封裝:Reel
TDA9884TS/V1/S1,11 功能描述:調(diào)節(jié)器/解調(diào)器 MOBILE VIF AND SIF RoHS:否 制造商:Texas Instruments 封裝 / 箱體:PVQFN-N24 封裝:Reel
TDA9884TS/V1/S1,118 制造商:NXP Semiconductors 功能描述:PHATDA9884TS/V1/S1.118 MOBILE VIF/SIF
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