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Old 25th November 2007, 11:01 PM   #1
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Question SRC4392 or AD1896

Hello,
I'm planning to build a DAC and I want to use ASRC to reduce jitter of the input signal. So there's a simple question: which one should i use: SRC4392 or AD1896?
The TI chip has separate curves for IP and OP dig servo loop
response. I am presuming the OP loop attenuates the ref clock
jitter and IP loop attenuates jitter from receiver portion of the
chip (whic has it's own PLL). Besides that, SRC has a steeper rolloff, 80dB/decade, compared to the AD chip at about 40dB/decade. However the AD chip starts a little sooner having better attenuation sub 20Hz.

Cheers!
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Old 26th November 2007, 10:48 PM   #2
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Iím new to this, so I hope Iíve done this right. After long debates I've come to the conclusion that it's easier/simplest for me to use SRC4392 since it have on chip "Integrated Digital Audio Interface Receiver" (S/PDIF Transmitter it's not important for me right now). It also provides two Digital Audio ports and separated inputs for Master and DIR PLL clocks. Even that, my question is still on. Later I will probably build a board to test AD1896 performances (with CS8416 as S/PDIF receiver).

Any other suggestions would be greatly appreciated!
Lorien
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Old 28th November 2007, 03:57 AM   #3
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Hi, also I'm planning to use SRC4392 and made testing board, but still no time to play with
SRC4392 requires 3.3V I2C programming.
So AD1896 will be simple even it requires externals.
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Old 28th November 2007, 07:24 AM   #4
Ipanema is offline Ipanema  Malaysia
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Hi,

Your board looks really neat. Which method are you using to make them?

Regards.
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Old 28th November 2007, 08:45 AM   #5
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AD1896 and SRC4192 are pincompatible, pinconfigurable.
Unfortunately I didn't success with SRC, its just generated noise.
After changing SRC with AD1896, it works fine.

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Old 28th November 2007, 02:43 PM   #6
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Quote:
Originally posted by Ipanema
Your board looks really neat. Which method are you using to make them?
made by ExpressPCB.com, "MiniBoard" service.
3.5x2.5 in board x 3 = $51 +ship&Tax. about $20 per 1 board.
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Old 29th November 2007, 10:43 PM   #7
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Hello guys! Thanks for replies!
to KOON3876:
Very nice prototype board! Is there a chance to build the firmware for SRC4392 in the future?
Quote:
AD1896 and SRC4192 are pincompatible, pinconfigurable.
Unfortunately I didn't success with SRC, its just generated noise.
After changing SRC with AD1896, it works fine...
This aren't good news since SRC4392 is an improved vesion of SRC4192 ASRC.
Still... is anyone here who already tested SRC4392? Any opinions about output signals?
Regards
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Old 30th November 2007, 12:21 PM   #8
Lucifix is offline Lucifix  Europe
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This is my board with SRC4392 used as SPDIF Receiver & ASRC.
KOON3876: I use CPLD as bridge between 5V and 3,3V signals, SRC in Serial Peripheral Interface (SPI) Mode (I2C not used here).
Comments and suggestions are welcome!
Lucifix
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Old 30th November 2007, 01:39 PM   #9
gmarsh is offline gmarsh  Canada
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I've used the 4392 in a couple of designs already. It's a good chip, like a CS8420 "done right". It does 192KHz, decent SRC, a proper differential input mux (not the multiple-RXP, single-RXN CS8416 thing) and I've yet to see the 4392 do the odd singing-in-the-shower-sound stuff that the 8420 does if you disconnect its input a bunch of times.

Though compared to a CS8416+AD1896 combo, it does require a bit more feeding; the SRC4392 needs a 1.8V core supply (extra LDO) and it won't do 5V interfacing without external logic. And there's no "hardware mode", you need to have a micro nearby to blast SPI/I2C at the '4392 to configure it at startup.

The SRC4392 has one advantage which helped me out in one case; you can hook up a 29MHz oscillator to RXCKI to clock the SRC, and a 24.576MHz to MCLK to clock the I2S serial ports. This lets the SRC4392 run a 192KHz master mode output, something you can't do with an AD1896.

The jitter rejection of both parts are pretty good, both are reliable, there's nothing really wrong with either approach. Best choice? *shrug*. Depends on your application.
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Old 13th December 2007, 10:39 AM   #10
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to gmarsh:
SRC4392's ASRC work above 192 khz. Have you tried 216 fs in one of your design?
Lorien
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