AFE5816: How to make DTGC positive step 0.125dB in "internal non-uniform mode"

Hi Yamashita-san,

Thanks for reaching out.

Please allow me some time to review the settings and I will get back to you by tomorrow.

Thanks & regards,

Abhishek

Hi Abhishek

I'm sorry, I have made a mistake.

・Register 165: 0BB8h (STOP_GAIN_TIME_0: 0BB8h)

Best Regards,

Hiromasa Yamashita

Hi Yamashita-san,

In the internal non uniform DTGC mode, the Gain Profile is completely user defined by programming a set of profile registers and a bank of memory consisting of 160, 16-bit registers. 

The Gain Step is selected and applied by looking at the content in the MEM_WORD_x. For example in the first cycle, the gain will only increase by 0.125dB if MEM_WORD[7] = 0. This will take effect after MEM_WORD[6:0] x 2^SLOPE_FAC[3:0] cycles.

Hence it is important to program the Memory Bank correctly. Figure below shows the flow diagram in the internal non-uniform mode.

I reviewed the sequece you share and I suggest you to use the below sequence to make it work. Also share the complete set of settings you are programming including the memory bank.

 DTGC_WR_EN

1. Register 182 – Program this register to select to mode, PROFILE_REG_SEL, SLOPE_FAC[3:0].

2. Register 181 – Program this register to select the required Memory Bank, SLOPE_FAC[0].

3. Program the Memory Bank. Register 1 to 160, For more information refer to the datasheet section

// Assuming Profile_0 is selected and Memory Bank 0 is used.

4. Register 161: 009Fh (START_GAIN_0: 00h, STOP_GAIN_0: 9Fh)
5. Register 162: 00FFh (POS_STEP_0: 00h, NEG_STEP_0: FFh) Set to default, OK.
6. Register 163: 009Fh (START_INDEX_0: 00h, STOP_INDEX_0: 9Fh): Set to default, OK.
7. Register 164: 0064h (START_GAIN_TIME_0: 0064h): set to 100 ADC clock cycles
8. Register 165: 009Fh (STOP_GAIN_TIME_0: 0BB8h): set to 3000 ADC clock cycles, OK
9. Register 185: 0000h: Default, OK

Let me know if you have further questions.

Thanks & regards,

Abhishek

Hi Abhishek,

I appreciate your advice.

I send you the current problem DTGC register setting data 0.125sb/step.

The ADC clock is 50MHz.

-------------------------------------------------------
Global Register0 : 0010h

DTGC Regster181 : 0100h (SLOPE_FAC[0]:0, ･･･, MEM_BANK_SEL[1:0]:0h, ･･･)

DTGC Regster182 : CD00h (MODE_SEL[1:0]:11d, PROFILE_REG_SEL[1:0]:0h, PROFILE_EXT_DIS:1, ･･･, SLOPE_FAC[3:1]:0h)

DTGC Regster161 : 009Fh (START_GAIN_0[7:0]:00h(6dB), STOP_GAIN0[7:0]:9Fh(159))
DTGC Regster162 : 00FFh (POS_STEP_0[7:0]:00h(0.125dB), NEG_STEP_0[7:0]:FFh(32dB))
DTGC Regster163 : 009Fh (START_INDEX_0[7:0]:00h(0), STOP_INDEX_0[7:0]:9Fh(159))
DTGC Regster164 : 0064h (START_GAIN_TIME_0[15:0]:0064h(100:2usec))
DTGC Regster165 : 0BB8h (STOP_GAIN_TIME_0[15:0]:0BB8h(3,000:60usec))

DTGC Regster185 : 0000h
DTGC Regster186 : 0000h

Global Register0 : 0010h

DTGC Regster1 : 0202h
DTGC Regster2 : 0202h
DTGC Regster3 : 0202h
DTGC Regster4 : 0202h
DTGC Regster5 : 0202h
DTGC Regster6 : 0202h
DTGC Regster7 : 0202h
DTGC Regster8 : 0202h
DTGC Regster9 : 0202h
DTGC Regster10 : 0202h
DTGC Regster11 : 0202h
DTGC Regster12 : 0202h
DTGC Regster13 : 0202h
DTGC Regster14 : 0202h
DTGC Regster15 : 0202h
DTGC Regster16 : 0202h
DTGC Regster17 : 0202h
DTGC Regster18 : 0202h
DTGC Regster19 : 0202h
DTGC Regster20 : 0202h
DTGC Regster21 : 0202h
DTGC Regster22 : 0202h
DTGC Regster23 : 0202h
DTGC Regster24 : 0202h
DTGC Regster25 : 0202h
DTGC Regster26 : 0202h
DTGC Regster27 : 0202h
DTGC Regster28 : 0202h
DTGC Regster29 : 0202h
DTGC Regster30 : 0202h
DTGC Regster31 : 0202h
DTGC Regster32 : 0202h
DTGC Regster33 : 0202h
DTGC Regster34 : 0202h
DTGC Regster35 : 0202h
DTGC Regster36 : 0202h
DTGC Regster37 : 0202h
DTGC Regster38 : 0202h
DTGC Regster39 : 0202h
DTGC Regster40 : 0202h
DTGC Regster41 : 0202h
DTGC Regster42 : 0202h
DTGC Regster43 : 0202h
DTGC Regster44 : 0202h
DTGC Regster45 : 0202h
DTGC Regster46 : 0202h
DTGC Regster47 : 0202h
DTGC Regster48 : 0202h
DTGC Regster49 : 0202h
DTGC Regster50 : 0202h
DTGC Regster51 : 0202h
DTGC Regster52 : 0202h
DTGC Regster53 : 0202h
DTGC Regster54 : 0202h
DTGC Regster55 : 0202h
DTGC Regster56 : 0202h
DTGC Regster57 : 0202h
DTGC Regster58 : 0202h
DTGC Regster59 : 0202h
DTGC Regster60 : 0202h
DTGC Regster61 : 0202h
DTGC Regster62 : 0202h
DTGC Regster63 : 0202h
DTGC Regster64 : 0202h
DTGC Regster65 : 0202h
DTGC Regster66 : 0202h
DTGC Regster67 : 0202h
DTGC Regster68 : 0202h
DTGC Regster69 : 0202h
DTGC Regster70 : 0202h
DTGC Regster71 : 0202h
DTGC Regster72 : 0202h
DTGC Regster73 : 0202h
DTGC Regster74 : 0202h
DTGC Regster75 : 0202h
DTGC Regster76 : 0202h
DTGC Regster77 : 0202h
DTGC Regster78 : 0202h
DTGC Regster79 : 0202h
DTGC Regster80 : 0202h
DTGC Regster81 : 0202h
DTGC Regster82 : 0202h
DTGC Regster83 : 0202h
DTGC Regster84 : 0202h
DTGC Regster85 : 0202h
DTGC Regster86 : 0202h
DTGC Regster87 : 0202h
DTGC Regster88 : 0202h
DTGC Regster89 : 0202h
DTGC Regster90 : 0202h
DTGC Regster91 : 0202h
DTGC Regster92 : 0202h
DTGC Regster93 : 0202h
DTGC Regster94 : 0202h
DTGC Regster95 : 0202h
DTGC Regster96 : 0202h
DTGC Regster97 : 0202h
DTGC Regster98 : 0202h
DTGC Regster99 : 0202h
DTGC Regster100 : 0202h
DTGC Regster101 : 0202h
DTGC Regster102 : 0202h
DTGC Regster103 : 0202h
DTGC Regster104 : 0202h
DTGC Regster105 : 0202h
DTGC Regster106 : 0202h
DTGC Regster107 : 0202h
DTGC Regster108 : 0202h
DTGC Regster109 : 0202h
DTGC Regster110 : 0202h
DTGC Regster111 : 0303h
DTGC Regster112 : 0303h
DTGC Regster113 : 0303h
DTGC Regster114 : 0303h
DTGC Regster115 : 0303h
DTGC Regster116 : 0303h
DTGC Regster117 : 0303h
DTGC Regster118 : 0303h
DTGC Regster119 : 0303h
DTGC Regster120 : 0303h
DTGC Regster121 : 0404h
DTGC Regster122 : 0404h
DTGC Regster123 : 0404h
DTGC Regster124 : 0404h
DTGC Regster125 : 0404h
DTGC Regster126 : 0404h
DTGC Regster127 : 0404h
DTGC Regster128 : 0504h
DTGC Regster129 : 0505h
DTGC Regster130 : 0505h
DTGC Regster131 : 0505h
DTGC Regster132 : 0505h
DTGC Regster133 : 0605h
DTGC Regster134 : 0606h
DTGC Regster135 : 0606h
DTGC Regster136 : 0606h
DTGC Regster137 : 0706h
DTGC Regster138 : 0707h
DTGC Regster139 : 0707h
DTGC Regster140 : 0707h
DTGC Regster141 : 0808h
DTGC Regster142 : 0808h
DTGC Regster143 : 0808h
DTGC Regster144 : 0909h
DTGC Regster145 : 0909h
DTGC Regster146 : 0A09h
DTGC Regster147 : 0A0Ah
DTGC Regster148 : 0B0Ah
DTGC Regster149 : 0B0Bh
DTGC Regster150 : 0C0Ch
DTGC Regster151 : 0E0Dh
DTGC Regster152 : 1210h
DTGC Regster153 : 1915h
DTGC Regster154 : 241Eh
DTGC Regster155 : 332Bh
DTGC Regster156 : 463Ch
DTGC Regster157 : 5D51h
DTGC Regster158 : 7A6Bh
DTGC Regster159 : 7F7Fh
DTGC Regster160 : 0000h

Global Register0 : 0000h
-------------------------------------------------------

If there are any mistakes in the register settings, please advise me.

Best Regards,

Hiromasa Yamashita

Hi Hiro-san, 

We are currently handling a large volume of customer queries. We will provide feedback on this by end of this week (Feb 3). 

Thanks for your patience and understanding. 

Thanks,

Karthik

Hi Karthik,

Using the DTGC register setting data that I reported earlier, I was able to increase the gain of the DTGC in steps of 0.125dB.

I don't have the device I used before, so I checked with 3 different devices and found that the DTGC gain increased in steps of 0.125dB.

I'm very sorry, it seems that there is a high possibility that there was an error in the register setting data.

Thanks & regards,
Hiromasa Yamashita

Hi Hiro-san, 

Okay. Just to check my understanding, your issue is resolved, correct?

Shall I close this thread then? 

Thanks,

Karthik

Hi Karthik,

The issue has been resolved, please close this thread.

Many thanks,

Hiromasa Yamashita