參數(shù)資料
型號(hào): TS4975
廠商: 意法半導(dǎo)體
英文描述: Stereo Headphone Drive Amplifier with Digital Volume Control via IC Bus
中文描述: 立體聲耳機(jī)驅(qū)動(dòng)集成電路放大器通過(guò)總線與數(shù)字音量控制
文件頁(yè)數(shù): 18/33頁(yè)
文件大?。?/td> 747K
代理商: TS4975
Application Information
TS4975
18/33
4
Application Information
The TS4975 integrates 2 monolithic power amplifiers. The amplifier output can be configured
as either SE (single-ended) capacitively-coupled output or PHG (phantom ground) output.
Figure 1 on page 3
shows schemas of these two configurations.
In a SE configuration an output capacitor, Cout, on each output is needed. This output coupling
capacitor blocks the Vcc/2 voltage (to which the output amplifier is biased) and couples the
audio signal to the load.
In a PHG configuration, internal buffers are connected to PHG1 and PHG2 pins biased to the
Vcc/2 voltage, and output amplifiers are also biased to the Vcc/2 voltage. Therefore, no output
capacitors are needed. The advantage of the PHG configuration is fewer external components
compared with a SE configuration. However, note that the device has higher power dissipation
(see Power dissipation and efficiency on page 22).
This chapter gives information on how to configure the TS4975 in application.
4.1
I2C bus interface
Table 8
summarizes the pin descriptions for the I2C bus interface.
Table 8.
I2C bus interface pin descriptions
4.1.1
I2C bus operation
The TS4975 uses a serial bus, which conforms to the I2C protocol, to control the chip’s
functions with two wires: Clock and Data. The Clock line is uni-directional. The Data line is bi-
directional (open-collector) with an external chip pull-up resistor (typically 10 kOhm). The
maximum clock frequency specified by the I2C standard is 400kHz.
Table 9.
Device slave address
The host MCU can write into the TS4975 control registers and read from the control registers.
The slave address of the TS4975 for writing is CC or CE hex. In order to write data into the
TS4975, after the “start” message, the MCU must send the following data:
send the I2C address slave byte with a low level for the R/W bit
send the data
Pin
Functional Description
SDA
This is the serial data input pin
SCL
This is the clock input pin
ADD
User-setable portion of device’s I2C address
A6
A5
A4
A3
A2
A1
A0
Rw
1
1
0
0
1
1
A0
X
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TS4982IQT 功能描述:音頻放大器 2W Stereo Audio Amp 125 mW 16 ohm 3 lvl RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel
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TS4984EIJT 功能描述:音頻放大器 2x1.2W stereo audio RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel