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参数资料
| 型号： | TDA9886TS/V3 |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 接收器 |
| 英文描述： | AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO24 |
| 封装： | 5.30 MM, PLASTIC, MO-150, SOT-340-1, SSOP-24 |
| 文件页数： | 5/56页 |
| 文件大小： | 248K |
| 代理商： | TDA9886TS/V3 |
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2003 Oct 02
13
Philips Semiconductors
Product specication
I2C-bus controlled single and multistandard
alignment-free IF-PLL demodulators
TDA9885; TDA9886
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 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 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 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 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
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.
8.16
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.
相关PDF资料 |
PDF描述 |
|---|---|
| TDA9887TS/V3 | AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO24 |
| 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 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TDA9887 | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:I2C-bus controlled multistandard alignment-free IF-PLL demodulator with FM radio |
| TDA9887HN/V4 | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:I2C-bus controlled multistandard alignment-free IF-PLL demodulator with FM radio |
| TDA9887HN/V4,518 | 功能描述:射频接收器 DEMODULATOR VIF AND RoHS:否 制造商:Skyworks Solutions, Inc. 类型:GPS Receiver 封装 / 箱体:QFN-24 工作频率:4.092 MHz 工作电源电压:3.3 V 封装:Reel |
| TDA9887HN/V4-T | 功能描述:射频接收器 DEMODULATOR VIF AND SIF RoHS:否 制造商:Skyworks Solutions, Inc. 类型:GPS Receiver 封装 / 箱体:QFN-24 工作频率:4.092 MHz 工作电源电压:3.3 V 封装:Reel |
| TDA9887T/V4 | 功能描述:射频接收器 DEMODULATOR VIF AND SIF RoHS:否 制造商:Skyworks Solutions, Inc. 类型:GPS Receiver 封装 / 箱体:QFN-24 工作频率:4.092 MHz 工作电源电压:3.3 V 封装:Reel |
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