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For Analog Audio Processors, How should unused signal input pins be handled for products that operate with Positive and Negative Power Supplies?
It can be connected to GND directly without a Coupling Capacitor. If a small current due to offset is a concern, connect it to GND via a Coupling Capacitor.
For Analog Audio Processors, How should unused input signal pins be handled in a product that operates with One or Two Positive Power Supplies?
Since the voltage at the input terminal is a Bias Voltage, it is recommended to connect it to GND via a Coupling Capacitor. It is also possible to leave OPEN the unused input signal pins, but External Noise, Crosstalk, etc. are more likely to occur.
For Analog Audio Processors, For products with VOL and FADER, how can I use them to reduce output noise?
To reduce the output noise level, decrease the gain of the FADER in the second stage instead of the VOL in the first stage.
For Analog Audio Processors, What type of product is Hi-VOL type?
Typical output of analog audio processors is about 2Vrms. Hi-VOL type can output 3 to 5Vrms.
For Analog Audio Processors, Why is the noise level higher when EQ is on than when EQ is off?
When the EQ is off, the signal does not pass through the equalizer circuit.
你好，我们有用到ADI品牌的 LT8301ES5和ROHM的BD4840FVE-TR的IC,我们现在想找国产IC可以替代的，性能一致就可以，是否有推荐的国产品牌可以替代呢？
推荐圣邦微隔离电源芯片SGM46000（替代LT8301ES5）和复位芯片SGM706-J（替代BD4840FVE-TR），均为功能性替代，相关技术资料参考链接：SGMicro（圣邦微） SGM46000 3W主变压器和用于隔离电源H桥驱动器数据手册SGMicro（圣邦微）SGM706 Low-Cost, Microprocessor Supervisory Circuit
12V输入，给3节锂电池（12.6V）充电的充电管理芯片有吗？电流2A即可。
推荐ROHM品牌的锂电池充电管理芯片：BD99954MWV，支持最多4节锂电池串联充电方式，产品带通讯接口。详细参数看如下链接 1 to 4-Cell Li-Ion Battery Manager For Application Processors BD99954MWV, BD99954GW数据手册
For Analog Audio Processors, Can a product that writes commands via I2C I/F also read back register values?
Reading of register value is not supported.
有没有IIC接口的单节锂电池充电管理芯片。多介绍几种，还在选型。
罗姆的BD99954MWV，支持1-4节锂电池的充电管理，带通讯口控制。规格书如下：1 to 4-Cell Li-Ion Battery Manager For Application Processors BD99954MWV, BD99954GW数据手册
When performing A/D conversion for multiple channels, are channels put into the sampling wait state until sampling of one channel is completed? Or, can sampling be performed simultaneously?
The ADC of our microcontroller performs A/D conversion while switching channels and therefore unprocessed channels are put into the wait state. Simultaneous conversion cannot be performed.
For Analog Audio Processors, Is it necessary to write data to the registers used for initial values when power is turned on?
When power is turned on, always perform system reset to initialize the registers. Be sure to set all the registers values even if they are default values.
Is there any way to avoid receiving data during CCA?
To prevent data reception during CCA, follow the steps shown below. To restore data reception after CCA, be sure to return to the original setting before reception. [Procedure] (1) Setting to prevent bit synchronization from being established BANK1: 0x5C = 0x00 BANK3: 0x03 = 0x00 (2) CCA started (3) Waiting for CCA completion (4) After completion of CCA, TRX_OFF (1) Setting to establish bit synchronization BANK1: 0x5C = original value BANK3: 0x03 = original value Related Products: ML7345 family
Is there any way to avoid receiving data during CCA?
To prevent data reception during CCA, follow the steps shown below. To restore data reception after CCA, be sure to return to the original setting before reception. [Procedure] (1) Setting to prevent bit synchronization from being established BANK2: 0x03 = 0x00 BANK2: 0x0E = 0x00 (2) CCA started (3) Waiting for CCA completion (4) After completion of CCA, TRX_OFF (1) Setting to establish bit synchronization BANK2: 0x03 = original value BANK2: 0x0E = original value Related Products: ML7396 family
For Analog Audio Processors, For a product that operates with One or Two Positive Power Supplies, can unused input signal terminals be grouped together with a single Coupling Capacitor?
Although it is possible to connect them together, please note the following points: ・Unexpected DC current may flow between unused terminals. ・Since the cutoff frequency is determined by the input impedance and the capacitance value of the coupling capacitor, connecting unused terminals together to a single coupling capacitor will increase the cutoff frequency and may reduce the noise rejection effect. ・If noise from unused pins is a problem, increase the capacitance value of the Coupling Capacitor connected to GND to reduce the noise from the unused pins.
In the FSK mode, when continuously transmitting the modulated wave using RF_TEST_MODE, the center frequency shifts by about 3 KHz.
As described in the data sheet, when using RF_TEST_MODE in FSK mode, the modulator reads unnecessary data before the generation of the expected test data just after TX_ON is started up. Therefore, the center frequency changes. To use RF_TEST_MODE correctly, check again through the following procedure. 1. Initialization register setting 2. Execute VCO_CAL 3. TX_ON 4. After starting up TX, MODEM reset * Note: Usually, this event does not occur when transmitting packets containing DIO control. So, it is not required to perform a MODEM reset after TX_ON. This is also an event specific to FSK mode. There is no problem in GFSK mode. Related Products: ML7344/ML7406 family, ML7345 family, ML7404, ML7414
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