About VDDs of 52833

[HuiHuang]

 Hi ：

1. There  VDD1-VDD5   ， what is the difference   (function 、overflow capacity )?  

2. Do they (VDD1- VDD5) must  need  LDO  Power supply ？   can  DCDC supply for them ? ( with several shunt capacitors) ? 

3. 

• Case ID: 280783    not reponse for  if  52833 support for 2MHz  occupied bandwidth ，  can you check it again ?

THX

[HuiHuang]

1. All VDD pins  must be externally connected. They are internally connected as well but the connection on the die isn't good enough to carry the current.

RE:  it  means  no  difference ? 

2. Please refer to the reference schematic

RE： it didnot  show  what  type of power VDD_nRF is ， LDO must or, DCDC？ could you check it ? 

 3. The occupied bandwidth for a 2 Mbps BLE carrier is 2.1 MHz. For 1 Mbps and coded phy, it's ~1 MHz. Both S2 and S8 are using a 1 Mbps carrier. 

RE： coded phy  only  support in 1Mbps？  

          what kind of  application will use this function(coded) ?  (take example ? )

THX

[ketiljo]

HuiHuang said:

1. All VDD pins  must be externally connected. They are internally connected as well but the connection on the die isn't good enough to carry the current.

RE:  it  means  no  difference ? 

The voltage on all pins must be the same, yes.

HuiHuang said:

2. Please refer to the reference schematic

RE： it didnot  show  what  type of power VDD_nRF is ， LDO must or, DCDC？ could you check it ? 

As long as the voltage on the VDD pins is between 1.8 and 3.6 V, it doesn't matter if you supply it with a LDO or DCDC converter. In case you use a DCDC, make sure that the supply is properly filtered so any noise from the DCDC converter doesn't influence the radio.

HuiHuang said:

 3. The occupied bandwidth for a 2 Mbps BLE carrier is 2.1 MHz. For 1 Mbps and coded phy, it's ~1 MHz. Both S2 and S8 are using a 1 Mbps carrier. 

RE： coded phy  only  support in 1Mbps？  

          what kind of  application will use this function(coded) ?  (take example ? )

Coded PHY is using 1 Mbps modulation on air bit forward error correction is added so the sensitivity of the receiver is better. https://www.bluetooth.com/blog/exploring-bluetooth-5-going-the-distance/