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TDA1305 Requirements
TDA1305 Requirements
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Old 5th January 2016, 07:51 PM   #1
PC91 is offline PC91  Argentina
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Join Date: May 2010
Default TDA1305 Requirements

Hi diyers, i don't know if its the correct forum so correct me if not.

Some months ago i've got a Technics SL-XP5, inside there's a dull sounding PCM55HP multiplexed for stereo and a very noisy preamp and headphones stage.

So, as technology evolved and got cheaper i'm completely rebuilding the audio stage.
By now i could get audio using a TDA1543 and also with an CX23034 digital filter and a CX20152 DAC.

Now the final goal is to build it using a spare TDA1305T from an old PCA80SC Scsi CD Drive, so as far as i understand the datasheet the pins should be:

1: VDDa : to 5v
2: VSSa : Ground
3: Test1: Ground (LOW for select LSB Fixed 16 bits)
4: BCK: to DSP
5: WS: to DSP
6: DATA: to DSP
7: CLKS1: LOW for select LSB Fixed 16 bits
8: CLKS2: HIGH for select LSB Fixed 16 bits

9: VSSd: Ground
10: VDDd: to 5v
11: Test2: Ground
12: SYSCLKI : ????? (256fs??)
13: NC
14: NC
15: VSSd: Ground
16: SYSCLKO: NC
17: DEEM1:LOW (for disable)
18: DEEM2: LOW (for disable)
19: MUSB: LOW (for deactivate)
20: DSMB: LOW (for deactivate)
21: ATSB: LOW (for deactivate)

22: VOL : to Headphone amp
23: FiltCL: Filter capacitor
24: FiltCR: Filter capacitor
25: VOR: to Headphone amp
26: Vref: Capacitors and ground
27: VSSo: Ground
28: VDDo: to 5v

On BOLD is what are my doubts, specially SYSCLKI i'm not sure what the DAC is expecting there and how are the tolerances, some IC only require that SYSCLK to be higher than BCLK and is good. So, i listen to your wisdoms on how to proceed.

Thanks!
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Old 5th January 2016, 09:33 PM   #2
Ciu is offline Ciu  France
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Location: Northern France
TDA1305 Requirements
Hello !

May be, you could find something in the Cambrige DacMagic Manual, with same topology , 2 TDA1305 inside .
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Old 6th January 2016, 11:51 AM   #3
PC91 is offline PC91  Argentina
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Thanks Ciu, but still can find anything that throws me light at the issue
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Old 9th February 2016, 02:09 PM   #4
PC91 is offline PC91  Argentina
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Join Date: May 2010
Success!!! after a lot of struggle an trial and error now my technics sl-xp5 is soundig terrific with its new tda1305t, it was not possible to completely eliminate the original audio stage, i have to keep the MN6618 digital filter since it made corrections to the clock necessary for the tda to work. So if anybody wants to hook up and TDA1305 to any technics or any device that handles standard EIAJ Serial digital audio at 16bits 44.1khz.. here is my wiring method:


1: VDDa : to 5v
2: VSSa : Ground
3: Test1: Ground
4: BCK: to DSP
5: WS: to DSP
6: DATA: to DSP
7: CLKS1: Ground
8: CLKS2: to 5v
9: VSSd: Ground
10: VDDd: to 5v
11: Test2: Ground
12: SYSCLKI : 16mhz input
13: NC
14: NC
15: VSSd: Ground
16: SYSCLKO: NC
17: DEEM1:Ground
18: DEEM2: Ground
19: MUSB: to 5v
20: DSMB: Ground
21: ATSB: Ground
22: VOL : Left output
23: FiltCL: Filter capacitor
24: FiltCR: Filter capacitor
25: VOR: Right Output
26: Vref: Read Below
27: VSSo: Ground
28: VDDo: to 5v


So… BCK, WS, DATA And SYSCLKI must go to the Digital Filter or DSP, on MN6618 is:

BCK: Pin 19
WS: Pin 15
DATA: Pin 20
SYSCLKI: Pin 34

That same applies with any other dac accepting EIAJ, TDA1543A, TDA1544, Some Burr Browns, AKM, Etc…

As for the output pins… TDA1305 has integrated OPAMP, and since i’m using a portable i can directly connect headphones to the DAC chip thus choosing the correct capacitors was trivial, for coupling the output i used 100uf OScons, and for filter pins i choose polyester caps, the smaller the better, this caps are really important since they make a filter and if are not really good, they filter too much.

For Vref, i found excelent results with an 100uf OScon and a small tantalum caps, also added a polyster cap in parallel but the result was the same.

Is a extremately good practice to use a dedicated Voltage regulator with good caps feeding the dac and digital filter to achieve cleaner results, i used 470uf OScon and 2.2uf tantalum in parallel.

Okay, any questions?
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Old 25th March 2019, 04:36 PM   #5
rockerxx69 is offline rockerxx69  Italy
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Default Twin differential dacs

Hallo. I want to by pass my twin differential tda 1305, op amps in balanced mode (Cambridge DAC magic ll mkii ) and feed a tube balanced analogic stage. Where do l find signal +,-, ground for channel??? Thanks
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Old 25th March 2019, 09:22 PM   #6
PC91 is offline PC91  Argentina
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You have to check the schematics for it to see how it's made, still lampizator made some mods on it DACMAGIC Cambridge tubed DAC player TDA1305
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Old 26th March 2019, 05:15 AM   #7
rockerxx69 is offline rockerxx69  Italy
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That s where I started, using a later time Balanced lampizator PCB tube analog stage, It was assembled by a guy abroad, first problem was that it had no 'slam' no speed, no up in yer face sound, so I contacted Lampizator and he kindly told me the components to change from his original project, so I reached finally the sound that I wanted, second problem is noise on the XLR outputs, which I use the most, RCA are absolutely silent, we ll have to raise the main PCB and see where the pins have been used, I want to by pass the in-built chip op amps and feed straight to the tube amp board-yes he talked (lampizator) on such a modding but not shown how and where get the balanced R and L signals.
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Old 26th March 2019, 04:34 PM   #8
PC91 is offline PC91  Argentina
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When i used the 1305 i ended using the internal OPamps, after reading a lot on the tda1549, that is mostly the same, people concluded that the Iout was not meant to be used since removing the OPamps gave distorted sound, it was necessary to use some sort of OPamp in order to became stable, still u can add better opamps. the RCA surely got disconected to avoid inducing noise on the new xlr circuit, you should check how it was done
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Old 5th April 2019, 01:44 PM   #9
rockerxx69 is offline rockerxx69  Italy
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Default tubed lampized dac

I went to a technician, I m not, as I stated earlier I do have hum on xlr outputs, rca are absolutely silent, the sound is great, we opened the dac, it was Lampized overseas, the guy removed the ops completely and soldered at the relais, we guessed, see photos, my actual tech did some new cabling and soldering, basically the signal s been taken from that point in the PCB-I ll go test it I guess it will be the same hum...has the signal been taken rightly??? thanks
Attached Images
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File Type: jpg dac sotto 2.jpg (447.9 KB, 39 views)
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Old 5th April 2019, 01:58 PM   #10
PC91 is offline PC91  Argentina
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Join Date: May 2010
i'm having a hard time trying to see where he took the signal, also removing the OPAmps is OK, you isolate the circuits, still looks like he used the RCA for something since it has wires to it.
About the hum... is maybe that the tube heaters are powered by AC and that is inducing humm
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